Fire-retardant, rubber-modified, monocarboxylic acid copolymers
AssigneeArco Polymers, Inc.
InventorsAdolph V. DiGiulio, Jack N. Bauer
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Abstract
Rubber-modified copolymers of monovinyl aromatic monomers and ethylenically unsaturated monocarboxylic acid monomers are blended with water as a blowing agent, bromodiphenylethers as fire retardants, and metal oxides as synergist for the ethers to form a composition which can be foamed to densities of between 1 and 10 pounds per cubic foot, said foam composition having fire-retardant properties.
Claims7
A process for making fire-retardant foams consisting of blending a mixture of (a) a rubber-modified copolymer of 5 to 40 weight percent of a rubber selected from the group consisting of homopolymers of conjugated dienes, copolymers of said dienes with up to 50 weight percent of one or more monoolefinically unsaturated monomers, ethylene-propylene-diene terpolymer rubbers, acrylate-diene copolymer rubbers and mixtures thereof and 95-60 weight percent of a copolymer of 70 to 95 mole percent of a monovinyl aromatic monomer and 5 to 30 mole percent of an ethylenically unsaturated monocarboxylic acid monomer;
- (b) from 0.5 to 10 percent by weight of water;
- (c) from 10 to 20 parts per hundred parts of copolymer of an at least tri-brominated diphenylether;
- and (d) 4 to 8 parts per hundred parts of copolymer of a metal oxide synergist for the ether until an intimate blend is obtained;
- heating the blend to a temperature of between 125.degree. and 190.degree. C. under sufficient pressure to prevent foaming of the blend;
- releasing the pressure to allow the blend to expand to a foam of density between 1 and 10 pounds per cubic foot;
- and cooling the resultant foam to room temperature.
Dependencies are inferred from the claim text.