Patent ID: 7262260
Filing Date: 2007-08-28
Classification: C08G

Abstract:
1. A method of preparing a segmented polymer, comprising the steps of: (i) forming solutions of α,ω-amine or hydroxy terminated polydimethylsiloxane, a diisocyanate, an α,ω-amine or hydroxyl terminated polyether and a low molecular weight diamine or a diol, where total equivalents of isocyanate groups is equal to the sum of the equivalents of reactive groups in other reactants, (ii) adding α,ω-amine or hydroxy terminated polydimethylsiloxane solution to a diisocyanate solution and reacting them, (iii) adding α,ω-amine or hydroxy terminated polyether solution to a solution resulting from (ii) and reacting them, and (iv) adding low molecular weight diol or diamine and reacting them.