Fire-retardant anhydride copolymers
AssigneeArco Polymers, Inc.
InventorsAdolph V. DiGiulio, Jack N. Bauer
Life of this patent
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Abstract
Copolymers of monovinyl aromatic monomers and the anhydrides of ethylenically unsaturated dicarboxylic 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 composition having fire retardant properties.
Claims7
A process for making fire-retardant foams consisting of dryblending a mixture consisting of (a) a copolymer of 50 to 95 mole percent of a monovinyl aromatic monomer and 5 to 50 mole percent of the anhydride of an ethylenically unsaturated dicarboxylic 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.