Patent ID: 8278399
Filing Date: 2012-10-02
Classification: C08G

Abstract:
1. A process for producing a siloxane-modified polyisocyanate, the process comprising: providing a polyisocyanate reactant; and reacting the polyisocyanate reactant with a hydroxyl-containing siloxane and optionally, a blocking agent, to form a siloxane-modified polyisocyanate, wherein the hydroxyl-containing siloxane has a number-average molecular weight of 200 to 3000 g/mol and an average OH functionality of greater than or equal to 2, and corresponding to the general formula (I): wherein each X independently represents an aliphatic, unbranched or branched C wherein each R independently represents a hydroxyl-functional radical selected from the group consisting of: (i) hydroxyfunctional carbon acid ester moieties of the formula (a) wherein x is 3 to 5; and (ii) hydroxyalkyl-functional amino group of Formula (b) wherein R 2 represents a substituent selected from the group consisting of H, methyl, ethyl, n-propyl, iso-propyl, cyclohexyl radicals, 2-hydroxyethyl, 2-hydroxypropyl, and 3-hydroxypropyl, and wherein R 3 represents a substituent selected from the group consisting of 2-hydroxyethyl, 2-hydroxypropyl and 3-hydroxypropyl; each R 1 independently represents a hydrogen or an optionally heteroatom-containing C 1 to C 10 hydrocarbon radical; and n is 1 to 40.