Patent ID: 8198340

Claim:
An alkenyl aromatic polymer foam comprising a polymer matrix containing one or more polymer and defining a plurality of cells having an average cell size wherein: (a) the alkenyl aromatic polymer foam has: (i) an average cell size according to ASTM method D-3576-04 that is in a range of 0.02 and 5 millimeters; (ii) a density of 64 kilograms per cubic meter or less according to ISO method 845-85; (iii) an open cell content less than 30 percent according to ASTM method D6226-05; and (iv) a cell size variation of 30% or less; and (b) 50 weight-percent or more of the one or more polymer consists of one or more polymer selected from a group consisting of alkenyl aromatic polymers; and wherein the alkenyl aromatic polymer foam further comprises one or more fluorinated alkene blowing agent at a concentration of 0.03 moles or more and 0.3 moles or less per 100 grams of polymer foam, the one or more fluorinated alkene blowing agent being selected from a group consisting of: hexafluoropropene; 2-fluoropropene, 1-fluoropropene; 1,1-difluoropropene; 3,3-difluoropropene; 3,3,3-trifluoropropene; 2,3,3-trifluoropropene; 1,3,3,3-tetrafluoropropene; 1,1,3,3-tetrafluoropropene; 1,2,3,3,3-pentafluoropropene; 4,4,4-trifluoro-1-butene; 3,4,4,4-tetrafluoro-1-butene; 1,1,3,3,3-pentafluoro-2-methyl-1-propene; octafluoro-1-butene; octafluoro-2-butene; 2,3,3,4,4,4-hexafluoro-1-butene; 1,1,1,4,4,4-hexafluoro-2-butene; 1,1,1,2,4,4,4-heptafluoro-2-butene; 3-fluoropropene, 2,3-difluoropropene; 1,1,3-trifluoropropene; 1,3,3-trifluoropropene; 1,1,2-trifluoropropene; 1-fluorobutene; 2-fluorobutene; 2-fluoro-2-butene; 1,1-difluoro-1-butene; 3,3-difluoro-1-butene; 3,4,4-trifluoro-1-butene; 2,3,3-trifluoro-1-butene; 1,1,3,3-tetrafluoro-1-butene; 1,4,4,4-tetrafluoro-1-butene; 3,3,4,4-tetrafluoro-1-butene; 4,4-difluoro-1-butene; 1,1,1-trifluoro-2-butene; 2,4,4,4-tetrafluoro-1-butene; 1,1,1,2-tetrafluoro-2 butene; 1,1,4,4,4-pentafluoro-1-butene; 2,3,3,4,4-Pentafluoro-1-butene; 1,2,3,3,4,4,4-Heptafluoro-1-butene; 1,1,2,3,4,4,4-Heptafluoro-1-butene; and 1,3,3,3-tetrafluoro-2-(trifluoromethyl)-Propene.