Cooperative Patent Classification


CPC Definition - Subclass C08C

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Last Updated Version: 2016.11
TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
Definition statement

This place covers:

  • processes directed to natural rubber or to conjugated diene rubber
  • treatment of diene rubber
  • chemical modification of diene rubber
Relationships with other classification places

Homo- or copolymers of dienes are classified in C08F 36/00, C08F 136/00, C08F 236/00.

References
Limiting references

This place does not cover:

Post-polymerisation treatment of addition polymers other than dienes

Chemical modification of addition polymers other than dienes

Preparation of living diene homo- or copolymers using anionic catalysts

Graft polymers

Coupling of polymers

Compositions of diene rubbers

Compositions of modified rubber

Compositions of rubber characterised by functional groups, e.g. telechelic diene polymers

Compositions of copolymers of ethene-propene or ethene-propene-diene, e.g. EPM or EPDM rubber

Compositions of copolymers of isobutene with minor part of conjugated dienes monomers, e.g. butyl rubber

Compositions of unconjugated diene polymers

Special rules of classification

The IPC group C08C1/16 is covered by C08C 1/14.

Glossary of terms

In this place, the following terms or expressions are used with the meaning indicated:

Diene rubber

Homopolymer or copolymer of compounds having as the major part one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds

Synonyms and Keywords

In patent documents, the following abbreviations are often used:

BR

Butadiene rubber

CR

Chloroprene rubber

EPM or EPDM

Ethene-propene or ethene-propene-diene rubber

IIR

Butyl rubber

IR

Isoprene rubber

NBR

Acrylonitrile butadiene rubber

NR

Natural rubber

SBR

Styrene butadiene rubber

Treatment of rubber latex
Definition statement

This place covers:

Chemical or physical treatment of rubber latex before or during concentration, e.g. purifying, deproteinising, preservation of rubber latex or concentrating

Coagulation

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Preserving ingredients

Treatment of rubber solutions
Definition statement

This place covers:

Treatment of rubber solutions, e.g. by purification, removal of catalyst residues or wining of rubber from solutions.

Treatment of coagulated rubber
Definition statement

This place covers:

Treatment of coagulated rubber, e.g. by purification

Chemical modification of rubber
Definition statement

This place covers:

Chemical modification of rubber, e.g. hydrogenation, oxidation, depolymerisation, isomerisation, cyclisation, incorporation of halogen, sulphur, nitrogen, phosphorus, silicon or metal atoms into the molecule, reaction with compounds containing carbon-to-carbon unsaturated bonds or addition of a reagent which reacts with a hetero atom or a group containing hetero atoms of the macromolecule.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Crosslinking agent, other than provided for by group C08C 19/30

Special rules of classification

In C08C 19/00 - C08C 19/44, in the absence of an indication to the contrary a process is classified in the last appropriate place.

of polymers containing metal atoms exclusively at one or both ends of the skeleton
Definition statement

This place covers:

Processes directed to the addition of a reagent which reacts with a hetero atom or a group containing heteroatoms of the macromolecule containing metal atoms exclusively at one or both ends of the skeleton, i.e. chemical reaction at the end of polymerchains prepared by living polymerization.

Glossary of terms

In this place, the following terms or expressions are used with the meaning indicated:

Heteroatoms

Refers to any atoms at the end of the skeleton chain not being carbon or hydrogen. Metals are also hetero-atoms.