Patent ID: 9238721
Filing Date: 2016-01-19
CPC Classification: C08G,C08J

Claim Text:
1. A process for preparing a rigid polymeric foam having a closed cell content closed cell content of greater than 85% and a density of less than 4.5 pounds per cubic foot, wherein the process comprises reacting: (a) an isocyanate composition comprising one or more organic polyisocyanates; and (b) an isocyanate reactive composition comprising: wherein either the isocyanate composition or the isocyanate reactive composition further comprises one or more hydrofluoroalkene blowing agents selected from the group consisting of 2-bromopentafluoropropene, 1-bromopentafluoropropene, 3-bromopentafluoropropene, 3,3,4,4,5,5,5-heptafluoro-1-pentene, 3-bromo-1,1,3,3-tetrafluoropropene, 2-bromo-1,3,3,3-tetrafluoropropene, 1-bromo-2,3,3,3-tetrafluoropropene, 1,1,2,3,3,4,4-heptafluorobut-1-ene, 2-bromo-3,3,3-trifluoropropene, E-1-bromo-3,3,3-trifluoropropene-1,3,3,3-trifluoro-2-(trifluoromethyl)propene, 1-chloro-3,3,3-trifluoropropene, 2-chloro-3,3,3-trifluoropropene, and 1,1,1-trifluoro-2-butene; and wherein the weight ratio of the first polyol to the second polyol is from 90:10 to 40:60 and the combined weights of the first polyol and the second polyol is at least 30% of the total weight of the reaction system.