Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

Description

C08K covers the incorporation of inorganic or non-macromolecular organic additives into macromolecular compound formulations, including fillers, reinforcing agents, plasticizers, colorants, and processing aids. This subclass addresses how these low-molecular-weight or mineral substances modify the properties of polymers and elastomers during compounding or formulation. The classification encompasses additives for improving mechanical strength, flexibility, thermal stability, electrical conductivity, and aesthetic properties of plastic and rubber compositions. C08K excludes the additives themselves (which fall under their respective chemical classes) and focuses specifically on their use and effect within macromolecular systems.

Filing statistics

CPC subclass C08K recorded 424,626 patent applications worldwide between 2013 and 2023. Annual filings grew from 23,807 in 2013 to 30,240 in 2023 (+27%), peaking at 51,973 applications in 2018. 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