C08J WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
Description
C08J covers general processing, compounding, and post-treatment operations for organic macromolecular compounds (polymers, rubbers, resins) that are not specifically classified in other C08 subclasses. This includes mixing, blending, plasticizing, cross-linking, vulcanization, and mechanical working-up of polymeric materials to modify their properties or prepare composite formulations. The subclass captures broad processing techniques applicable across multiple polymer types and applications, serving as a residual category for compounding operations and after-treatments not detailed in specialized divisions such as polyurethanes (C08G), elastomers (C08C), or specific polymer synthesis routes.
Filing statistics
CPC subclass C08J recorded 285,413 patent applications worldwide between 2013 and 2023. Annual filings grew from 17,164 in 2013 to 23,907 in 2023 (+39%), peaking at 31,262 applications in 2020. The most active applicants in class C08 are LG CHEM (15,432 applications), DOW GLOBAL TECHNOLOGIES (14,214 applications) and BASF (BADISCHE ANILIN & SODA FABRIK) (11,155 applications).
Source: EPO PATSTAT, worldwide filings
112 direct subcodes
Child Classifications
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- C08J 11/00 Recovery or working-up of waste materials (recovery of plastics B29B17/00; polymerisation processes involving purification or recycling of waste polymers or their depolymerisation products C08B, C08C, C08F, C08G, C08H)
- C08J 2201/00 Foams characterised by the foaming process
- C08J 2203/00 Foams characterized by the expanding agent
- C08J 2205/00 Foams characterised by their properties
- C08J 2207/00 Foams characterised by their intended use
- C08J 2300/00 Characterised by the use of unspecified polymers
- C08J 2301/00 Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J 2303/00 Characterised by the use of starch, amylose or amylopectin or of their derivatives or degradation products
- C08J 2305/00 Characterised by the use of polysaccharides or of their derivatives not provided for in groups C08J2301/00 or C08J2303/00
- C08J 2307/00 Characterised by the use of natural rubber
- C08J 2309/00 Characterised by the use of homopolymers or copolymers of conjugated diene hydrocarbons
- C08J 2311/00 Characterised by the use of homopolymers or copolymers of chloroprene
- C08J 2313/00 Characterised by the use of rubbers containing carboxyl groups
- C08J 2315/00 Characterised by the use of rubber derivatives (C08J2311/00, C08J2313/00 takes precedence)
- C08J 2317/00 Characterised by the use of reclaimed rubber
- C08J 2319/00 Characterised by the use of rubbers not provided for in groups C08J2307/00 - C08J2317/00
- C08J 2321/00 Characterised by the use of unspecified rubbers
- C08J 2323/00 Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J 2325/00 Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
- C08J 2327/00 Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
Top Applicants
Top 10 applicants by patent filingsfor class C08, 2013–2023, worldwide · Source: EPO PATSTAT
- LG CHEM KR 15,432
- DOW GLOBAL TECHNOLOGIES US 14,214
- BASF (BADISCHE ANILIN & SODA FABRIK) DE 11,155
- 3M INNOVATIVE PROPERTIES COMPANY (MINNESOTA MINING AND MANUFACTURING INNOVATIVE PROPERTIES COMPANY) US 6,455
- FUJIFILM JP 6,178
- CHINESE ACADEMY OF SCIENCES 5,569
- SHIN-ETSU CHEMICAL COMPANY JP 5,506
- SINOPEC (CHINA PETROCHEMICAL CORPORATION) 5,443
- TORAY INDUSTRIES JP 4,635
- NITTO DENKO CORPORATION JP 4,620