Preparation of a macrocellular acoustic foam
AssigneeDow Global Technologies LLC
InventorsSuresh Subramonian, Sandrine Burgun, Chung P. Park
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Abstract
A process for making a macrocellular acoustic foam is disclosed in which a foamable gel made of a blowing agent and a polymeric resin composition is subjected to an extrusion process 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 and macrocellular foams obtainable by that process are also disclosed which are made of: A) one or more homopolymers of ethylene, one or more C3-C20 α-olefin polymers, or a combination thereof; B) one or more halogenated flame retardants; C) optionally, one or more polymers other than that of Component A; and D) optionally, one or more flame retardant synergists.
Claims19
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 comprises
- A) one or more homopolymers of ethylene, one or more C3-C20 α-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 α-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.
A macrocellular acoustic foam comprising;
- A) one or more homopolymers of ethylene, one or more C3-C20 α-olefin polymers, or a combination thereof;
- B) one or more halogenated 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 α-olefin monomers with one or more vinyl or vinylidene aromatic monomers and/or hindered aliphatic or cycloaliphatic vinyl or vinylidene monomers.
Dependencies are inferred from the claim text.