Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. condensation polymers, where the polymers are:

Polymers from aldehydes or ketones, the polymers including polyacetals and phenol-formaldehyde-type resins such as novolaks or resoles,

Polymers from isocyanates or isothiocyanates, the polymers including polyurethanes and polyureas,

Epoxy resins,

Polymers obtained by reactions forming a carbon-to-carbon link in the main chain, e.g. Polyphenylenes and polyxylylenes,

Polymers obtained by reactions forming a linkage containing oxygen in the main chain, e.g. Polyesters, polycarbonates, polyethers and copolymers of carbon monoxide with aliphatic unsaturated compounds,

Polymers obtained by reactions forming a linkage containing nitrogen in the main chain, e.g. Polyamides, polyamines, polyhydrazides, polytriazoles, polyimides, polybenzimidazoles and nitroso rubbers,

Polymers obtained by reactions forming a linkage containing sulphur in the main chain, e.g. Polysulphides, polythioethers, polysulphones, polysulphoxides, polythiocarbonates and polythiazoles,

Polymers obtained by reactions forming a linkage containing silicon in the main chain, e.g. Polysiloxanes, silicones or polysilicates,

Other polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. Polymers obtained by reactions forming a linkage containing other elements in the main chain, e.g. P, B, AL, Sn, block copolymers obtained by inter-reacting polymers in the absence of monomers, dendrimers and hyperbranched polymers.

Processes for preparing the macromolecular compounds provided for in this subclass.

Relationships with other subclasses of class C08 and C09

Subclasses C08B - C08L are generally function-oriented subclasses in relation to the polymers per se, while C09D - C09K are application-oriented subclasses in relation to the said polymers (see below for the special relationship with C09D and C09J).

Polysaccharides per se and their derivatives are classified in C08B.

Treatment and chemical modification of rubbers (homo- or copolymers of dienes classified in C08F 36/00, C08F 136/00, C08F 236/00), are classified in C08C – however synthesis of rubbers and treatment or chemical modification of non-rubbers are classified in subclasses C08F or C08G.

Polymers as such, or their preparations are classified in C08F or C08G.

Macromolecular compounds per se obtained by reactions only involving carbon-to-carbon unsaturated bonds (usually known as addition polymers) are in C08F. Compositions based on monomers of such polymers are also in C08F.

Compositions of macromolecular compounds, either with other macromolecular compounds or with other ingredients, including compositions of polysaccharides, rubbers or natural macromolecular compounds, are classified in subclass C08L.

Coating compositions are classified in C09D and adhesive compositions are classified in C09J.

Coating compositions and other polymer compositions for similar uses, e.g. paints, inks, woodstains and printing pastes, are classified in C09D.

C09D and C09J are seen as "related fields" of C08L - this structure has implications on search and classification.

For classification:

For searching: both C08G and C09D subclasses are to be searched, regardless of the wording of the claims, since in many documents of C08G, a passage relating to the use of the composition for coating can be found.

These rules apply in analogy for the adhesive compositions of C09J.

C09G covers the application of the compositions of C08L when used as polishes. Adhesives and adhesive processes are classified in C09J.

Derivatives of natural macromolecular polymers per se, e.g. derived from proteins or vulcanised oils, are classified in C08H.

Working-up, general processes of compounding and after-treatment are covered by subclass C08J. These include making solutions, dispersions etc., plasticising, compounding with additives, e.g. colouring or masterbatching, crosslinking, manufacture of articles or shaped materials, chemical treatment or coating of such articles, making porous, cellular or foamed materials, and recovery or working up of waste materials.

Materials used in applications not otherwise provided for, are classified in C09K. These include sealing or anti-slip materials, heat-transfer, heat-exchange or heat-storage materials, drilling compositions, luminescent or tenebrescent materials, etching, surface-brightening or pickling materials, antioxidant materials, soil-conditioning or soil-stabilising materials, liquid crystal or fireproofing materials.

The preparation for medical, dental or toilet purposes is classified in A61K.

Biocidal, pest repellant, pest attractant, or plant growth regulatory activity of chemical compounds or preparations is further classified in A01P.

Application of macromolecular compositions as biocides, pest-repellants, pest-attractants, or plant growth activity regulators is further classified in subclass A01N.

Therapeutic activity of macromolecular compounds is further classified in subclass A61P.

The use of cosmetics or similar toilet preparations is further classified in subclass A61Q.

Processes using enzymes or microorganisms in order to (i) liberate, separate or purify a pre-existing compound or composition, or to (ii) treat textiles or clean solid surfaces of materials, are further classified in subclass C12P.

Classification guidance

In this subclass, C-Sets classification is applied to the following groups, listed in the table below, if the document discloses a pertinent combination of technical features that cannot be covered by the allocation of a single symbol. The fourth column of the table indicates the place where the detailed information about the C-Sets construction and the associated syntax rules can be found, in the definition section "Special rules of classification".

The specific C-Sets rule is located at only one place of the base symbol in the section "Special rules of classification" in the definition. If the C-Sets rule is applicable to all groups of a subclass, it is located at the subclass level only. If the same C-Sets rule is applicable to multiple groups or subgroups within the same subclass, the C-Sets rule is placed at the highest group or subgroup of the multiple groups.

Polymerisation of acetaldehyde or cyclic oligomers thereof e.g. polymerisation of trioxane

Condensation polymers of aldehydes with ketones only, see for example WO2007141119 or US2005080222

For example,

Naphthalene-formaldehyde polymer (C08G 10/02).

For example

Within this main group, in the absence of an indication to the contrary, classification is made in the last appropriate place. This means that urea-melamine-formaldehyde resins are classified in C08G 12/38.

for example

For example, condensation of aldehydes or ketones with natural products, oils, bitumens or residues.

Polymeric products containing ureide or urethane prepared without using isocyanate or isothiocyanate are classified in C08G 71/00.

Classification guidance

C8Ga : A prepolymer (C08G 18/10) that is reacted with water (C08G 18/302) is classified as (C08G 18/10, C08G 18/302).

#C8Ga : A prepolymer (C08G 18/10) that is reacted with ethylene glycol (C08G 18/3206) is classified as (C08G 18/10, C08G 18/3206).

#C8Ga : A prepolymer (C08G 18/10) that is reacted with polyethylene glycol (C08G 18/4833) is classified as (C08G 18/10, C08G 18/48) and C08G 18/4833.

#C8Ga : A prepolymer which is obtained from two high molecular weight compounds (C08G 18/12) that is reacted with ethanol (C08G 18/282) is classified as (C08G 18/12, C08G 18/282).

#C8Ga : A prepolymer (C08G 18/10) that is reacted with toluene di-isocyanate (C08G 18/7621) is classified as (C08G 18/10, C08G 18/7621).

#C8Ga : A prepolymer obtained from the reaction of PEG and PPG with a diisocyanate molecule (C08G 18/12); that is reacted with a polycaprolactone (C08G 18/4277) is classified as (C08G 18/12, C08G 18/42) and C08G 18/4277.

#C8Gb: An isocyanate-functionalized prepolymer (C08G 18/10) that is trimerized in the absence of a compound having active hydrogen into an isocyanurate compound (C08G 18/022) is classified as (C08G 18/10, C08G 18/022).

#C8Gb and #C8Ga : An isocyanate-functional prepolymer (C08G 18/10) that is trimerized in the presence of ethylene glycol into an isocyanurate compound (C08G 18/09) is classified as (C08G 18/10, C08G 18/09) (according to #C8Gb) and (C08G 18/10, C08G 18/3206) (according to # C8Ga).

#C8Gc: The addition of hydroxyethyl acrylate (C08G 18/672) onto an isocyanate functional compound based on dimethylol propionic acid (C08G 18/348) is classified as (C08G 18/672, C08G 18/0823). Also allocate dimethylol propionic acid (C08G 18/348) as a single symbol.

#C8Gc and #C8Gd : The addition of hydroxyethyl acrylate (C08G 18/672) onto an isocyanate prepolymer based on a mixture of polyethylene glycol and dimethylol propionic acid (C08G 18/6692) is classified as (C08G 18/672, C08G 18/0823) according to #C8Gc and (C08G 18/672, C08G 18/6692) according to # C8Gd. Also allocate polyethylene glycol (C08G 18/4833) and dimethylol propionic acid (C08G 18/348) as single symbols.

#C8Gd : The addition of hydroxyethyl methacrylate (C08G 18/672) onto an isocyanate-terminated polyethylene glycol (C08G 18/4833) is classified as (C08G 18/672, C08G 18/48) and C08G 18/4833.

#C8Ge : The addition of isocyanatoethyl methacrylate (C08G 18/8116) to dimethylol propionic acid is classified as (C08G 18/8116, C08G 18/0823) according to # C8Ge. Also allocate dimethylol propionic acid (C08G 18/348) as a single symbol.

#C8Ge and #C8Gf: The addition of isocyanatoethyl methacrylate (C08G 18/8116) to a mixture of polyethylene glycol and dimethylol propionic acid is classified as (C08G 18/8116, C08G 18/0823) according to # C8Ge and (C08G 18/8116, C08G 18/6692) according to #C8Gf. Also allocate polyethylene glycol (C08G 18/4833) and dimethylol propionic acid (C08G 18/348) as single symbols.

#C8Gf: The addition of isocyanatoethyl methacrylate (C08G 18/8116) onto polyethylene glycol (C08G 18/4833) is classified as (C08G 18/8116, C08G 18/48) and C08G 18/4833.

C-Sets search queries may be made according to C-Sets classification rules described in C08G 18/00.

Process features such as catalysts which are specific for polymeric products of isocyanates or isothiocyanates and are not covered elsewhere

Oligomerisation of isocyanates in the presence of compounds that are reactive towards isocyanate

Additional information: oligomerisation to isocyanurate groups are classified in C08G 2115/02.

Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen having a high molecular weight (more than 10 repeating monomer units or a molecular weight higher than 500) in a first reaction step.

In C08G 18/10 and C08G 18/12, C-Sets (e.g. # C8Ga, #C8Gb) are used. The detailed information about the C-Sets construction and the associated syntax rules are found in the "Special rules of classification" in C08G 18/00.

C-Sets search queries may be made according to C-Sets classification rules described in C08G 18/00.

Compounds containing active hydrogen and having a molecular weight of less than 500 or have less than 10 repeating monomer units.

C08G 18/0838 takes precedence over this subgroup.

Compounds having more than one group containing active hydrogen.

Compounds having more than one group containing active hydrogen and having a molecular weight of more than 500 or having more than 10 repeating monomer units.

C08G 18/0838 takes precedence over this subgroup.

What is known in industry as, "polymer polyols": polymers containing active hydrogen (polyol) with particles prepared from polymerised carbon to carbon unsaturated monomers grafted onto the active hydrogen polymer or forming a block copolymer with the active hydrogen polymer.

The polymerised carbon to carbon unsaturated monomer particles are dispersed in the active hydrogen containing polymer (polyol) which is reactive towards isocyanate. The polymerised carbon to carbon unsaturated monomer particles themselves are therefore not reactive towards isocyanate.

Mixtures of low molecular weight compounds having active hydrogen with high molecular weight compounds (more than 10 repeating monomer units or a molecular weight higher than 500) having active hydrogen where either the low molecular weight (less than 10 repeating monomer units or a molecular weight lower than 500) compound is essential for the invention or where the high molecular weight (more than 10 repeating monomer units or a molecular weight heigher than 500) compound is not a compound of groups C08G 18/42 , C08G 18/48 or C08G 18/52

C08G 18/0838 takes precedence over this subgroup.

Mixtures of low molecular weight compounds having active hydrogen with high molecular weight compounds having active hydrogen from the groups C08G 18/42 , C08G 18/48 or C08G 18/52

Compounds that have Carbon to Carbon unsaturation and groups that are reactive towards isocyanate/isothiocyanate.

In C08G 18/67 - C08G 18/679 and C08G 18/671 - C08G 18/672, C-Sets (e.g. #C8Gc, # C8Gd) are used. The detailed information about the C-Sets construction and the associated syntax rules are found in the "Special rules of classification" in C08G 18/00.

C-Sets search queries may be made according to C-Sets classification rules described in C08G 18/00.

Use of oligomerised isocyanates.

Blocked polyisocyanates or polyisocyanates prereacted with low molecular weight compounds having active hydrogen.

Unsaturated iso(thio)cyanates and poly(thio)isocyanates masked with unsaturated compounds having active hydrogen

In C08G 18/81 - C08G 18/8191 and C08G 18/8158 - C08G 18/8175, C-Sets (e.g. #C8Gf, # C8Ge) are used. The detailed information about the C-Sets construction and the associated syntax rules are found in the "Special rules of classification" in C08G 18/00.

C-Sets search queries may be made according to C-Sets classification rules described in C08G 18/00.

Chemical modification of polyurethanes other than through reaction with isocyanate or isothiocyanate

Epoxy resins, i.e. all polycondensates having more than one epoxy groups per molecule (diepoxides and polyepoxides).

Epoxy resins characterized by special parameters.

The use or choice of inorganic or non-macromolecular organic materials as compounding agents are classified in subclass C08K.

Compositions of macromolecular compounds, either with other macromolecular compounds or with other ingredients, including compositions of polysaccharides, rubbers or natural macromolecular compounds, are classified in subclass C08L.

Coating compositions and other polymer compositions for similar uses, e.g. paints, inks, woodstains and printing pastes, are classified in subclass C09D.

Adhesives and adhesive processes are classified in subclass C09J.

Materials for applications not otherwise provided for, or applications of materials not otherwise provided for, are classified in subclass C09K. These include sealing or anti-slip materials, heat-transfer, heat-exchange or heat-storage materials, drilling compositions, luminescent or tenebrescent materials, etching, surface-brightening or pickling materials, antioxidant materials, soil-conditioning or soil-stabilising materials, liquid crystal or fireproofing materials.

Subclasses C08B-C08L are generally function-oriented subclasses in relation to the polymers they cover, while C09D-C09K are application-oriented subclasses in relation to the said polymers.

No Indexing Codes are used in this group.

Last place rule:

When an epoxy composition comprises a special hardener, or mixtures of special hardeners, catalysts or characteristic epoxy resins, classification is given in C08L 63/00, but also the corresponding classes in subgroups of C08G 59/00, since C08G 59/00 is much more detailed.

The preparation of epoxy resins, in a general way.

Polycondensates containing more than one epoxy group per molecule, characterised by the preparation or apparatus used.

Polycondensates containing more than one epoxy group per molecule, characterized by the purification methods.

Preparation of polycondensates containing more than one epoxy group per molecule, where an unsaturated precursor is epoxydized, e.g. by an oxidative step.

The modification of epoxy resins, by further reaction with organic or inorganic compounds.

Polymers obtained by polycondensation of epoxy resins with curing agents or catalysts

Advancement polymers having end epoxy groups.

Relationship with other subclasses and main groups of classes C08 and C09:

Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds under polyaddition reactions wherein the reactive carbon-carbon group stays intact without cleavage of fragments are classified in subclass C08F.

Corresponding main groups for the polymers according to main group C08G 61/00 can be found in the main groups C08L 65/00 (compositions based on such polymers), C09D 165/00 (coating compositions based on said polymers), and C09J 165/00 (adhesive compositions based on such polymers).

Relationship with main groups of the same subclass C08G:

Polymers prepared by condensation reactions of aldehydes or ketones with phenols only are classified in groups C08G 8/00 - C08G 8/38, since C08G 2/00 - C08G 16/00 takes precedence. For the same reasons, condensation polymers of aldehydes or ketones only are classified in C08G 6/00 - C08G 6/02. Polymers which may otherwise be formed by carbon-carbon bond formation, but which are prepared by condensation reactions other than those involving the formation of carbon-carbon bonds in the main chain, are classified in the appropriate groups, e.g. C08G 73/0611 for polypyrroles formed from amines and polyketones. Polyketones are classified in C08G 67/02.

In the subclass C08G, main group C08G 18/00 takes precedence over all other groups. A further classification is given if the polymers are obtained by reactions forming specific linkages for which an appropriate group is provided.

Within each main group of this subclass, in the absence of an indication to the contrary, classification is made in the last appropriate place.

In main groups C08G 61/00-C08G 79/00, in the absence of an indication to the contrary, macromolecular compounds obtained by reactions forming two different linkages in the main chain are classified only according to the linkage present in excess.

In the subgroup C08G 61/12, the following peculiarities apply:

For polymers comprising different heterocyclic constituents in the polymer main chain, a classification will be put for each. For example, a polymer consisting of thiophene, pyrrole, and triphenylamine in polymerised form will be classified in C08G 61/12 for the triphenylamine, C08G 61/124 and C08G 61/126.

Polymers according to C08G 61/00 which have been obtained from five-membered heterocyclic monomers comprising more than one heteroatom in the heterocycle will be classified in C08G 61/123.

When the macromolecular compounds are formed from condensed heterocyclic monomers, e.g. 2,1,3-benzothiadiazole, which comprise a five- or six-membered heterocycle, such a compound would still be considered derived from five- or six-membered heterocyclic compounds.

For example, a polymer derived from a 2,1,3-benzothiadiazole starting compound would be classified in C08G 61/123. Complementary structural aspects, such as codification of condensed heterocycles, are classified in C08G 2261/30 -C08G 2261/376.

When assigning the main group C08G 61/00 or subgroups thereof to a document, classification in the main group C08G 2261/00 and/or subgroups thereof is obligatory.

In the absence of an indication to the contrary, classification is made in the last appropriate place within C08G 2261/00 and subgroups. Classification in this main group is obligatory when classes in C08G 61/00 and subgroups thereof are assigned to a document.

3,4-Ethylenedioxythiophene in polymerised form is classified in C08G 2261/1424 plus C08G 2261/3223 and not in C08G 2261/344 (the aspect of cyclised ether side-chain is prominent).

C08G 2261/46 is only used as an additional symbol for classifying Diels-Alder crosslinking reactions of polymers prepared by reactions falling within the scope of C08G 61/00 - C08G 61/127 (since polymerisations effected by Diels-Alder cycloadditions are polyaddition reactions per se covered by subclass C08F of the classification scheme).

In C08G 2261/30, the following peculiarities apply: For polymers comprising different heterocyclic constituents in the polymer main chain, a classification will be entered for each. E.g. a polymer consisting of thiophene, pyrrole, and triphenylamine in polymerised form will be classified in C08G 2261/3162 (triphenylamine), C08G 2261/3221 (pyrrole), and C08G 2261/3223 (thiophene).

When the macromolecular compounds are formed from condensed heteroaromatic monomers which comprise various aromatic heterocycles, each heterocycle will be classified (of course as condensed ring system). For example, thieno[3,4-b]pyrazine in polymerised form will be classified in C08G 2261/3243 (a condensed thiophene unit) and in C08G 2261/3241 (standing for the condensed pyrazine ring).

In condensed aromatic ring systems comprising aromatic and heteroaromatic condensed rings only the heteroaromatic rings will be specified in C08G 2261/00 - C08G 2261/964. For example, benzo[c]thiophene in polymerised form will be classified in C08G 2261/3243.

When partially aromatic (or heteroaromatic) structural elements are incorporated into the polymeric main chain, which can be broken down into smaller main chain constituents, the latter should also be classified (unless specific pertinent subgroups such as C08G 2261/3424 or C08G 2261/3442 exist):

E.g. a 2,5-diethinylthiophene monomeric unit should be classified in C08G 2261/344, C08G 2261/3223, and in C08G 2261/3328 (since the polymer could have been prepared from thienyl and ethinyl monomers instead).

Polymeric products containing ester bonds in the backbone.

Polyester not provided for in groups C08G 63/06 - C08G 63/6988.

Polyesters containing sequences obtained by polycondensation of one or more ω-hydroxycarboxylic acid derivatives, e.g. hydroxyalkanoates

Polyesters containing sequences obtained by ring-opening of one or more cyclic esters, e.g. polylactic acid or ε-caprolactone.

Polyesters derived from polycarboxylic acids and polyhydroxy compounds which have been prepared in the presence of 10 wt% or more of ester forming compounds having more than two reactive groups.

Polyesters containing sequences obtained by polycondensation of one or more dicarboxylic acids and one or more dihydroxy compounds.

Polyesters derived from dicarboxylic acids and dihydroxy compounds which have been prepared in the presence of less than 10 wt% of compounds having one reactive group or more than two reactive groups.

Polyesters chemically modified by esterification with unsaturated monoacids or monoalcohols.

Polymers containing carboxylic ester groups and carbonate groups, even if the carbonate groups are in excess.

Polyesters containing ether groups of any kind, e.g. sugar moieties, polyalkylene oxide sequences.

C08G 63/42 and C08G 63/58 take precedence over C08G 63/66.

Polyesters containing heteroatoms at any place in the side- or main chain

Preparation processes in which the process or a step thereof is characterized by the apparatus or a feature thereof

Processes in which the preparation of polylactones or polylactides is characterized by the catalyst used.

Polymeric products containing carbonate bonds in the backbone.

Block- and graft copolymers containing polycarbonate sequences and sequences of polymers of C08G.

Preparation of polyether by ring opening reaction of cyclic ether in the presence of "other compound" e.g. active H containing compound which acts as an initiator for polymerisation. e.g. R-OH + n ethylene oxide → R-(O-CH₂-CH₂)n

(1) If the "other compound" contains two different active H containing groups, the compound should be classified in both relevant groups e.g. aminoethanol should be classified in C08G 65/2609 and C08G 65/2624.

(2) If the "other compound" is sugar or polysaccharide containing OH groups, classification should be made in C08G 65/2606.

(3) Aniline is classified in C08G 65/2627 which reads " Aromatic or arylaliphatic amine group" .

(4) Pyridine or piperazine are classified in C08G 65/263 which reads "Heterocyclic amine" .

Compounds characterised by the catalyst used in the ring opening reaction between a cyclic ether and an "other compound".

(1) Classification is made according to the metal in the catalyst if any.

(2) Boron is considered a metal.

(3) Magnesium is to be considered an alkaline earth metal.

(4) If a catalyst is classified in C08G 65/269 (mixed catalyst systems), then separate components should be classified as well; for example,

(5) If a catalyst should be classified in C08G 65/2693 – then if possible both components should be classified, e.g. aluminium supported on clay based catalyst is classified in C08G 65/2693, C08G 65/2654 and C08G 65/2657.

Post-polymerisation treatment of cyclic ethers made exclusively by ring opening reactions of cyclic ethers, e.g. recovery, purification, drying or removal of catalyst residues even if done by chemical means for example acidification.

Polyethers made from phenols and other compounds e.g. OH-Ar-OH + X-Ar-X where X is a halogen leaving groups. It encompasses aromatic (Ar) polyethers or polyetherketones.

Polyketones made by reaction of from carbon monoxide with aliphatic unsaturated compounds

Polymers containing the following repeat unit:

.

Polyamides derived from

amino-carboxylic acids, e.g. alpha-amino-carboxylic acids

lactams, e.g. beta-lactams

from polyamines and polycarboxylic acids

Pyrrolidones or piperidones

Polyester-amides

Preparations of above polymers

Post-polymerisation treatment or polymers modified by chemical after-treatment

Polyamines, e.g. polyethyleneimines

Polyhydrazides, polytriazoles, polyamino-triazoles or polyoxadiazoles

Polyimides, polyester-imides or polyamide-imides

Unsaturated polyimide precursors

Polybenzimidazoles

Polybenzoxazoles

The IPC group C08G73/04 is not used, group C08G 73/0206 or subgroups are used instead.

Polymers where there is a Si atom in the main chain; they are referred to with the MDTQ nomenclature.

Compositions of polymers containing Si in the main chain and other polymers are classified in C08L 83/00.

Coating of polymers containing Si in the main chain are classified in C09D 183/00 and adhesives of polymers containing Si in the main chain are classified in C09J 183/00.

When classifying within this group, a distinction has to be made structurally between polysilicates and siloxanes which contain Si-R groups, such as polymers, which contain only D-units, or resins which contain at least one branching unit such as T or Q.

Polysilicates are in C08G 77/02, all kind of other polymers or resins are in C08G 77/04 or its sub-groups.

It is obligatory to add the following additional indexing codes (CAA) where applicable:

Polysiloxanes with organic subsitiuents on the Si-O backbone are also commonly referred to in the literature as "polyorganosiloxanes" and "organopolysiloxanes". The terms "siloxanes" and "silocones" are also commonly encountered for these compounds.

"platin+" or" karstedt" are often used as synonyms when searching for "platinum catalyst";

((alkoxy 2d cur+), (condens+ 2d cur+), tin+, stannous+ or (moisture 2d cur+)) are often used as synonyms when searching for condensation catalysts;

perox+ is often used when searching for radical or peroxide catalysts

Polymers containing Si in the main chain where only Q groups are present, with no organic groups attached to the siloxane backbone, e.g. synthesis of polymers or gels via tetraethoxy orthosilicate (TEOS) condensation reactions.

Polysiloxanes, i.e. at least one M, D or T group present, e.g. T-resins, MQ-resins, D-polymers or silsesquioxanes, with more than 25 silicon atoms.

This group is used when a no more relevant group can be found.

Polysiloxanes with at least five silicon atoms present, e.g. cyclosiloxanes, polyhedral silsesquioxane (POSS, T​8 cubes), or oligomers.

Processes referred to as redistribution, polymerization-deploymerizatiohn, resizing.

Polysiloxanes where the O atom is present in the substituents and not the backbone, e.g. direct or no direct silicon to oxygen bonding, epoxy groups, glycol or glycerol, polyhydric alcohol substituents or carbinols, i.e.

Si-CH₂-OH

C08G 77/045 takes precedence over this group.

HO-PDMS-OH or condensed siloxane resins of the form RSiO_xOH_y having Si-OH groups.

RO-PDMS-OR or condensed siloxane resins of the form RSiO_xOR_y having Si-OR alkoxy groups.

Polysiloxanes containing silicon bound to unsaturated aliphatic groups, e.g. vinyl or (meth)acrylate.

C08G 77/045 takes precedence over this group.

Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen, e.g. isocyanates or oximes

Physical post-polymerisation treatments which result in no change in length of polysiloxane backbone

C08G 77/045 takes precedence over this group.

Polysiloxanes modified by chemical after-treatment which result in no change in length of polysiloxane backbone, but in polysiloxanes having substituents to be specified in sub-groups

C08G 77/045 takes precedence over this group.

Preparation of block- or graft-polymers starting from a pre-existing polysiloxane backbone.

Preparation of block- or graft-polymers containing only polysiloxane sequences, e.g. from a MQ siloxane resin cocondensed with a D siloxane polymer.

Preparation of block- or graft-polymers containing polyurethane sequences, e.g. urethane-urea type copolymers.

Polymers where there is a Si atom in the main chain in which at least two but not all the silicon atoms are connected by carbon linkages, e.g. vinyl endblocked PDMS is reacted with Si-H endblocked PDMS in a stochiometric ratio of >1:1 so that defined macromolecular species are build:

2 ^ViMD_xM^Vi + ^HMD_xM^H → ^ViMD_xM^CH2-CH2MD_xM^CH2-CH2MD_xM^Vi

or the analog reaction scheme with α,ω vinyl endcapped aliphatic hydrocarbons:

^ViR^Vi + ^HMD_xM^H → ^ViR ^CH2-CH2MD_xM^CH2-CH2R^Vi with R being an aliphatic hydrocarbon

C08G 77/485 takes precedence over this group.

Polymers where there is a Si atom in the main chain in which at least two but not all the silicon atoms are connected by carbon linkages containing aromatic rings, e.g.

^ViR^Vi + ^HMD_xM^H → ^ViR ^CH2-CH2MD_xM^CH2-CH2R^Vi with R being an aromatic hydrocarbon.

Polymers where there is a Si atom in the main chain in which at least two but not all the silicon atoms are connected by metal-containing linkages, e.g. silane co-condensation with Ti, Al or Zr alkoxides

C08G 77/485 takes precedence over this group.

Polymers where there is a Si atom in the main chain in which all the silicon atoms are connected by linkages other than oxygen atoms, e.g. polysilanes or polysilcarbenes

Polymers where there is a Si atom in the main chain in which all the silicon atoms are connected by nitrogen atoms, e.g. polysilazanes

Polyphosphazenes are with the repeat unit

-(-RR'P=N-)-_n

Polyphosphates

Block copolymers obtained by inter-reacting at least two preformed polymers in the absence of monomers.

Relationship between C08G 81/00 and C08F 299/00

C08F 299/00 refers to macromolecular compounds obtained by inter-reacting polymers involving only carbon-to-carbon unsaturated bond reactions.

C08G 81/00 refers to macromolecular compounds obtained by inter-reacting polymers involving reactions other than carbon-to-carbon unsaturated bond reactions.

Block or graft polymers containing sequences of polymers of C08F or C08C and of polymers of C08G.

Block or graft copolymers obtained by coupling polymers containing sequences of conjugated dienes and of polymers containing vinyl aromatic monomers, e.g. SBR.

Block or graft polymers containing sequences of polymers of C08F or C08C and polyether.

Block or graft polymers containing sequences of polymers of C08F or C08C and polyester or polycarbonate.

Block or graft polymers containing sequences of polymers of C08F or C08C and polyamides

Unusual or so-called "exotic" polymers, including polymers not only of C08G, but also of C08F.

In this group are classified documents not provided in any of the (sub)groups of C08G or C08F.

Macromolecular compounds containing organic and inorganic sequences, e.g. organic polymers grafted onto silica.

all types of dendritic polymers not classified already in C08G 83/003 and C08G 83/005, such as

i) linear dendritic polymers

ii) dendrigraft polymers

iii) star-hyperbranched polymers

iv) hypergraft polymers.

Dendritic polymers are materials with a highly branched structure. Dendritic polymers are characterised by structure and not by chemical nature. Since this particular technical field is growing rapidly, and the classification scheme cannot keep its pace with the developments, in the absence of a more suitable place, all types of dendritic polymers are classified in C08G 83/002 or in one of the subgroups.

Dendrimers; i.e. polymers having a core from which emanates an exponentially increasing number of dendritic branches.

See corresponding note under C08G 83/002.

Hyperbranched polymers; i.e. polymers having a tree-like structure.

See corresponding note under C08G 83/002.

Polyrotaxanes; polycatenanes.

A polyrotaxane comprises a linear molecule and cyclic molecules in which the linear molecule is included in cavities of cyclic molecules in a skewered manner, and capping groups, each of which locates at each end of the linear molecule in order to prevent the dissociation of the cyclic molecule.

Supramolecular polymers, where the monomer units are held together by reversible secondary interactions in the main chain.

Supramolecular polymers are polymeric arrays of monomer units, held together by reversible and highly directional secondary interacting -that is, non-covalent bonds, such as hydrogen bonds.

Processes for treating polymers not classified in any of C08G or C08F groups.

C08F is referred to in this group because there is no group under C08F corresponding to C08G 85/00. So although it would in principle not appear correct to classify here post- or after-treatment of such polymers (C08F), which have not already been classified elsewhere, a place must in practice be found here for such documents.

Post-polymerisation treatment of polymers not classified in any of C08G or C08F groups.

After-treatment of polymers, not classified neither in C08G nor C08F, by chemical modification.

preventing the deposition of scale in polymerisation reactors.

Cleaning reaction vessels with chemicals, e.g. polymerisation reactors or extruders.