Patent ID: 7230036
Filing Date: 2007-06-12
Classification: B01J,C08G,C08J,C08K,C08L,Y10T

Abstract:
1. A polyurethane and/or polyisocyanurate rigid insulation foam made using expandable microspheres which encapsulate a primary blowing agent such that the microspheres are expanded during foam making to function as a blowing agent by mixing: 160 to 310 PBW expandable microspheres having an encapsultated blowing agent and an average unexpanded diameter less than 50 microns; 191 to 500 PBW isocyanate; 75 to 125 PBW polyol; and 14 to 201 PBW other ingredients with less than 2% by weight of non-encapsulated blowing agents.