Patent ID: 6720363
Filing Date: 2004-04-13
Classification: C08J

Abstract:
A macrocellular acoustic foam obtainable by subjecting a foamable gel comprising at least one blowing agent and at least one polymeric resin composition to an extrusion process, wherein said polymeric resin composition comprisesA) one or more homopolymers of ethylene, one or more C3-C20 &agr;-olefin polymer, or a combination thereof; B) one or more haloganated flame retardants; C) optionally, one or more polymers other than that of Component A; and D) optionally, one or more flame retardant synergists, wherein component A does not include substantially random interpolymers comprising polymer units derived from one or more &agr;-olefin monomers with one or more vinyl or vinylidene aromatic monomers and/or hindered aliphatic or cycloaliphatic vinyl or vinylidene monomers and the extrusion process is conducted at a die pressure greater than the prefoaming critical die pressure but less than or equal to four times that of said prefoaming critical die pressure.