Patent ID: 8524792
Filing Date: 2013-09-03
Classification: C08J,C08L

Abstract:
1. A method of producing a deformable, non-resilient foam board capable of being formed into a curved shape without significantly resiling, cracking, or otherwise damaging the integrity of the foam board, wherein the foam board is formed from an expanded, solidified molten blend of polystyrene and a vinyl polymer having a melt index of 1 to 2 grams/10 minutes at 190° C., the vinyl polymer containing 20 to 40 mol % copolymerized vinyl alcohol, wherein the amount of vinyl polymer in the molten blend is sufficient so that (a) the foam board contains 0.2 to 1.1 weight % copolymerized vinyl alcohol, and further so that (b) a transverse sample of the foam board having a nominal thickness of 1 inch (about 2.54 cm) exhibits a radius at failure, R and wherein the amount of vinyl polymer contained in the molten blend is no greater than 2.5 weight %.