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IPC Subclass
C08C

TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS

Introduced: September 1968

Classification Context

Section:
CHEMISTRY; METALLURGY
Class:
ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
Subclass:
TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS

Description

C08C covers chemical and physical treatment processes applied to natural or synthetic rubber polymers to alter their properties or performance characteristics. This includes vulcanization, cross-linking, grafting, blending with other polymers or additives, and structural modifications such as halogenation or oxidation. The subclass encompasses both batch and continuous treatment methods intended to improve elasticity, durability, processing behavior, or functional properties of rubber materials. Adjacent classes C08F (macromolecular compound synthesis) and C08L (polymer compositions and blends) are distinguished by focusing on the modification of pre-formed rubber rather than polymerization reactions or final formulated compositions.

Additional Content

Glossary

diene rubber diene rubbers 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 rubbers 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 vulcanised and finished into a variety of products

Limiting references

Treatment of addition polymers other than dienes Chemical modification of addition polymers other than dienes Homo- or copolymers of dienes , , Preparation of living diene homo- or copolymers using anionic catalysts Graft polymers Coupling of polymers Foaming natural rubber 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 Compositions of diene rubbers

Application references

Depolymerisation to the original monomer Crosslinking, e.g. vulcanising, of rubber Crosslinking, e.g. vulcanising, of latex Working-up of waste rubber by depolymerisation or devulcanisation Destructive distillation of waste rubber materials Production of liquid hydrocarbon mixtures from rubber or rubber waste

Related Keywords

chemical AFTER-TREATMENT of polymers(1) treatment of RUBBER in general and of natural and synthetic conjugated diene RUBBER(2) synthetic RUBBERafter-treatment of synthetic RUBBER polymerisates

5 direct subcodes

Child Classifications

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  • C08C 4/00 Treatment of rubber before vulcanisation, not provided for in groups

Top Applicants

Top 10 applicants by patent filingsfor class C08, 2013–2023, worldwide · Source: EPO PATSTAT

  1. LG CHEM KR 14,262
  2. DOW GLOBAL TECHNOLOGIES US 12,486
  3. BASF (BADISCHE ANILIN & SODA FABRIK) DE 9,858
  4. SINOPEC (CHINA PETROCHEMICAL CORPORATION) 7,877
  5. CHINESE ACADEMY OF SCIENCES 6,993
  6. FUJIFILM JP 5,049
  7. 3M INNOVATIVE PROPERTIES COMPANY (MINNESOTA MINING AND MANUFACTURING INNOVATIVE PROPERTIES COMPANY) US 4,923
  8. SHIN-ETSU CHEMICAL COMPANY JP 4,517
  9. BOREALIS AT 4,213
  10. ARKEMA FR 4,098