Aqueous dispersions of polyurethanes which are crosslinkable...

C - Chemistry – Metallurgy – 09 – D

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400/7407, 204/91

C09D 4/06 (2006.01) B05D 7/12 (2006.01) C08G 18/12 (2006.01) C08G 18/28 (2006.01) C08G 18/67 (2006.01) C09D 175/04 (2006.01) C14C 11/00 (2006.01) D06N 3/14 (2006.01)

Patent

CA 2013062

O.Z. 0050/40708 Abstract of the Disclosure: Aqueous dispersions of poly- urethanes which are crosslinkable by the action of high energy radiation contain (a) a polyisocyanate, (b) a polyol having a molecular weight of from 400 to 6,000 g/mol, (c) if required, a polyol having a molecular weight of from 62 to 399 g/mol, (d) if required, a poly- amine having two or more amino groups which are reactive to isocyanate, (e) if required, an aminoalcohol having one or more amino groups which are reactive to iso- cyanate, (f) a compound containing ionic groups or groups which can be converted into ionic groups and one or more hydroxyl or amino groups which are reactive to iso- cyanate, (g) if required, a monofunctional polyetherol and (h) a compound having one or more ethylenically un- saturated groups and one or more hydroxyl groups. The compound having an ethylenically unsaturated group (h) is used in amounts corresponding to 0.02-0.08 gram equiva- lent, based on the polyisocyanate (a), of OH, and the polyurethane, dissolved in dimethylformamide, has a Fikentscher K value greater than 40 or is insoluble in dimethylformamide.

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