Patent ID: 8907037

Claim:
A method of preparing a polymeric methylene diphenyl diisocyanate-polydialkylsiloxane resin comprising isocyanate functionality by mixing at a temperature between 25° C. and 100° C.: (i) polymeric methylene diphenyl diisocyanate with (ii) a 3-(2-hydroxyethoxy) propyl dimethyl terminated polydimethylsiloxane having a general formula of: where z is a value of between 0 and 500, the polydimethylsiloxane having a viscosity of from 5 to 500 000 cSt at 25° C., in the presence of toluene; and subsequently extracting the solvent, if present; and wherein component (i) is present in an amount of from 40 to 80% of the total weight of (i) and (ii).