C08C - Definition 
Definition statement
This subclass covers:
Processes directed to natural rubber or to conjugated diene rubber.
Processes directed to rubbers in general.
Treatment of diene rubber.
Modification of diene rubber, e.g. chemical reaction on the chain end after living polymerization.
Relationship between large subject matter areas
The synthesis of natural rubber or conjugated diene rubbers per se is classified in C08F.
The post-polymerisation treatment or chemical modification of addition polymers is classified in C08F.
Processes directed to a specific rubber, other than provided for above, are classified in C08F-C08H.
Compositions of rubbers are classified in C08L.
Working-up and foaming natural rubber are classified in C08J.
References relevant to classification in this subclass
This subclass does not cover:
Treatment of addition polymers other than dienes | C08F 6/00 |
Chemical modification of addition polymers other than dienes | C08F 8/00 |
Homo- or copolymers of dienes | C08F 36/00, C08F 136/00, C08F 236/00 |
Preparation of living diene homo- or copolymers using anionic catalysts | C08F 36/04 |
Graft polymers | C08F 279/00 |
Coupling of polymers | C08G 81/02 |
Foaming natural rubber | C08J 9/00 |
Compositions of modified rubber | C08L 15/00 |
Compositions of rubber characterised by functional groups, e.g. telechelic diene polymers | C08L 19/00 |
Compositions of copolymers of ethene-propene or ethene-propene-diene, e.g. EPM or EPDMrubber | C08L 23/16 |
Compositions of copolymers of isobutene with minor part of conjugated dienes monomers, e.g. butyl rubber | C08L 23/22 |
Compositions of unconjugated diene polymers | C08L 47/00 |
Compositions of diene rubbers | C08L 7/00 – C08L 21/00 |
Depolymerisation to the original monomer | C07C 4/22 |
Crosslinking, e.g. vulcanising, of rubber | C08J 3/24 |
Crosslinking, e.g. vulcanising, of latex | C08J 3/26 |
Working-up of waste rubber by depolymerisation or devulcanisation | C08J 11/10 |
Destructive distillation of waste rubber materials | C10B 53/07 |
Production of liquid hydrocarbon mixtures from rubber or rubber waste | C10G 1/10 |
Informative references
Attention is drawn to the following places, which may be of interest for search:
Mechanical aspects of crosslinking or vulcanization of rubber | B29C 35/00 |
Crosslinking agent, other than provided for by group C08C 19/30 | C08K |
Special rules of classification
In groups C08C 19/02-C08C 19/30 in the absence of an indication to the contrary, a process is classified in the last appropriate place.
Glossary of terms
In this subclass, 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 |
| Rubber | Any synthetic elastic material whose properties resemble the material obtained from the latex sap of trees, e.g. trees of the genera Hevea or Ficus, or the latex sap per se that can be vulcanized and finished into a variety of products |
Synonyms and Keywords
In patent documents the following abbreviations are often used:
| BR | Butadiene rubber |
| CR | Chloroprene rubber |
| EPDM | Ethene-propene-diene rubber |
| EPM | Ethene-propene rubber |
| IIR | Butyl rubber |
| IR | Isoprene rubber |
| NBR | Acrylonitrile butadiene rubber |
| NR | Natural rubber |
| SBR | Styrene butadiene rubber |