Patent ID: 6420444
Filing Date: 2002-07-16
Classification: C08J

Abstract:
A closed cell foam comprising from C8-12 vinyl aromatic polymer comprising:i) from 60 to 100 weight % of one or more C8-12 vinyl aromatic monomers; and ii) from 0 to 40 weight % of one or more monomers selected from the group consisting of C1-4 alkyl esters of acrylic or methacrylc acid and acrylonitrile and methacrylonitrile; which polymer may be grafted onto or occluded within from 0 to 12 weight % of one or more rubbery polymers selected from the group consisting of: iii) co- and homopolymers of C4-5 conjugated diolefins; and iv) copolymers comprising from 60 to 85 weight % of one or more C4-5 conjugated diolefins and from 15 to 40 weight % of a monomer selected from the group consisting of acrylonitrile and methacrylonitrile, said vinyl aromatic polymer comprising 10 to 45 weight % of a star branched polymer and having a VICAT softening temperature not less than 100Â° C.