Patent ID: 8445556
Filing Date: 2013-05-21
Classification: C08G,C08J

Abstract:
1. A process for preparing a polyurethane or polyrethane/urea elastomeric closed cell foam, comprising the steps of: a) blending components including at least one polyisocyanate with at least one polyol, and at least one blowing agent; b) curing the blended components to form a solid polymeric elastomer, wherein the at least one blowing agent is dispersed in the elastomer; and c) heating the solid polymeric elastomer to activate the at least one blowing agent and form a solid polyurethane or polyrethane/urea elastomeric closed cell foam wherein the step c) is carried out in an oven with at least two zones set at two different temperatures and wherein the solid polymeric elastomer is passed through each zone at a speed to provide a dwell time at the particular temperature.