Coating composition to be processed as two components, for...

C - Chemistry – Metallurgy – 09 – D

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C09D 175/00 (2006.01) C08G 18/10 (2006.01) C08G 18/16 (2006.01) C09K 3/10 (2006.01)

Patent

CA 2120860

ABSTRACT: Coating composition to be processed as two components, for the preparation of PUR elastomers A solvent-free or low-solvent coating composition to be processed as two components is disclosed. The composition comprises an isocyanate component A and a curing agent component B, wherein A) is an aliphatic or cycloaliphatic polyisocyanate prepolymer having an NCO content of from 1 to 15% by weight, B 1) a diketimine of the general formula I Image )2 in which R1 is an alkylene radical having 2 to 20 carbon atoms, an alkylene radical having 4 to 100 carbon atoms containing oxygen and/or N-alkyl groups as bridging members, or a cycloalkylene radical having 5 to 20 carbon atoms, R2 and R3 are identical or different alkylene radicals having 1 to 8 carbon atoms, or R2 and R3, together with the carbon atom double-bonded to the nitrogen atom, form a 5- membered or 6-membered ring, and B 2 ) an aromatic or aliphatic carboxylic or sulphonic acid. The composition, which is characterized by a high reactivity and short curing time, is suitable for the preparation of polyurethane elastomers having a broad range of hardness without foaming of the elastomer material due to water/isocyanate reaction.

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