Patent ID: 9587080
Date: 2017-03-07
CPC Classifications: C08G,C08J

Claim:
1. A process for preparing rigid polymeric foam having a 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 alkane blowing agents and 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 40:60 to 25:75 and the combined weights of the first polyol and the second polyol is at least 20% of the total weight of the reaction system.