Patent ID: 8318826
Filing Date: 2012-11-27
Classification: C08G

Abstract:
1. A process for preparing a rigid polyurethane foam, comprising a) forming a reactive mixture containing at least 1) a polyol mixture having an average of 3.5 to 7 hydroxyl groups/molecule and an average hydroxyl equivalent weight of 90 to 175, wherein the polyol mixture contains from 5 to 75% by weight of an amine-initiated polyol having an average functionality of greater than 3.0 up to 4.0, the polyol being a reaction product of at least one C 2) at least one blowing agent and 3) at least one polyisocyanate; and b) subjecting the reactive mixture to conditions such that the reactive mixture expands and cures to form a rigid polyurethane foam, wherein the reactive mixture has a flow index of 1.2 to 1.5 and the rigid polyurethane foam has a 10° C. k-factor no greater than 19.5 mW/m-° K.