Coating compositions
AssigneeHenkel Kommanditgesellschaft auf Aktien
InventorsRainer Hoefer, Roland Gruetzmacher, Gerhard Kaindl
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Abstract
The invention is a coating composition containing an aqueous polyurethane dispersion wherein the polyurethane is prepared from a mixture of polycaprolactone diols and an isocyanate mixture having an NCO functionality of more than 1.5 wherein the ratio NCO:OH is from 0.9:1 to 2.5:1. The polyurethane also can contains functional components capable of salt formation in the aqueous solution. The coating composition is particularly useful for coating flexible substrates such as leather and flexible polymeric materials.
Claims18
A coating composition for flexible substrates containing an aqueous polyurethane dispersion, wherein the polyurethane dispersion comprises a polyurethane comprising residues of a block A of a polycaprolactone diol and a block B of a polycaprolactone diol wherein an average molecular weight of the block A is different from an average molecular weight of the block B and each of block A and block B falls within an average molecular weight of from 230 to 10,000 and a hydroxyl value of from 15 to 540 and wherein a ratio of an amount by weight of block A to an amount by weight of block B is from 10:1 to 1:10.
Dependencies are inferred from the claim text.