Polyaddition products which contain uretdione groups

Details Polyaddition products which contain uretdione groups Polyaddition products which contain uretdione groups

C - Chemistry, Metallurgy

08

G

402/131, 117/195

C08G 18/10 (2006.01) C08G 18/28 (2006.01) C08G 18/30 (2006.01) C08G 18/79 (2006.01)

Patent

CA 1084196

Abstract of the Disclosure The present invention teaches a novel polyisocyanate lacquer binder and a method of preparing it. The binder is prepared by reacting uretdione containing polyisocyanates optionally mixed with uretdione fee diisocyanates with water or with low molecular weight compounds which have two alco- holic hydroxyl groups per molecule. Optionally these com- pounds may be mixed with up to 60 wt.% based on the total weight of hydroxyl bearing compounds, of low molecular weight compounds with one active alcoholic hydroxyl group per molecule. The proportion of reactants is so selected that the binder produced has from 5 to 20 wt.% of latent isocyanate groups in the form of unopened uretdione rings. The binder can then be mixed with poly- hydroxyl compounds having molecular weights of 400 to 10,000 and conventional lacquer pigments and fillers. This mixture can then be coated on a substrate and the coating heated to above 100°C to effect hardening.

223960

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