Preparation of a macrocellular acoustic foam

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 9/00 (2006.01) C08L 23/02 (2006.01)

Patent

CA 2400648

A process for making a macrocellular acoustic foam is disclosed in which a foamable gel comprising a blowing agent and a polymeric resin composition is subjected to an extrusion process characterized by 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 are disclosed obtainable by that process which are made of: A) one ore more homopolymers of ethylene, one ore more C3-C20 .alpha.-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.

L'invention concerne un procédé de préparation d'une mousse acoustique macrocellulaire. Ce procédé consiste à soumettre un gel moussant comprenant un agent d'expansion et une composition de résine polymérique à une opération d'extrusion caractérisée par une pression de filière supérieure à la pression de filière critique de prémoussage mais inférieure ou égale à quatre fois la pression de filière critique de prémoussage, ledit procédé permettant d'obtenir des mousses macrocellulaires constituées par (A) un ou plusieurs homopolymères d'éthylène, un ou plusieurs polymères alpha -oléfiniques C3-C20, ou une combinaison desdits composés, (B) un ou plusieurs ignifuges halogénés, (C) éventuellement un ou plusieurs polymères autres que ceux du constituant (A), et (D) éventuellement un ou plusieurs synergistes ignifuges.

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