Patent ID: 11920058
Assignee: ALLNEX NETHERLANDS B.V.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A powder coating composition comprising one or more crosslinkable components and a catalyst characterized in that the one or more crosslinkable components are crosslinkable by Real Michael Addition (RMA) reaction, the powder coating composition comprising:
a. a crosslinkable component A having at least 2 acidic C—H donor groups in activated methylene or methine,
b. a crosslinkable component B having at least 2 activated unsaturated acceptor groups C═C, which react with component A by Real Michael Addition (RMA) to form a crosslinked network,
c. a latent catalyst system C comprising a strong base or a precursor of a strong base to catalyze the RMA crosslinking reaction at a curing temperature below 200° C. and at least 70° C.,
wherein the catalyst system C is a latent catalyst system LC selected from the group consisting of
a latent catalytic system LCC having chemical latency comprising components that react at the curing temperature to initiate the reaction between crosslinkable components A and B, said latent catalytic system LCC comprising embodiment LCC1:
a) a weak base C2,
b) an activator C1 reactive with C2 or a protonated C2 at the curing temperature, and
c) optionally further comprising an acid C3.