Heat hardenable coating composition based on polyurethane...

Details Heat hardenable coating composition based on polyurethane... Heat hardenable coating composition based on polyurethane...

C - Chemistry, Metallurgy

09

D

402/142, 117/195

C09D 175/04 (2006.01) C08G 18/10 (2006.01) C08G 18/12 (2006.01) C08G 18/48 (2006.01) D06M 15/564 (2006.01) D06N 3/14 (2006.01)

Patent

CA 1334717

The present invention is directed to a heat hardenable coating composition containing A) a prepolymer containing an average of 2-4 ketoxime- blocked isocyanate groups, having an average molecular weight of about 500 to 15,000 and based on an aromatic polyisocyanate and a polyhydroxyl component which contains about 20-100% by weight of ethylene oxide units and B) a cross-linking agent corresponding to the following formula Image in which R and R1 denote H or C1-C4-alkyl, the equivalent ratio of blocked isocyanate groups in A) to NH2 groups in B) being about 1.35:1 to 0.95:1. The invention is also directed to the coated substrates obtained from the compositions according to the invention.

587609

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