Flame-retardant composition
AssigneeCities Service Company
InventorsJohn Versnel, Joseph Green
Life of this patent
Estimating the term…
Abstract
Flame-retardant compositions having an excellent balance of properties are obtained by flame-retarding rubber-modified polystyrenes with a mixture of about 55-95% by weight of a first flame retardant corresponding to the formula: ##STR1## AND ABOUT 45-5% BY WEIGHT OF A SECOND FLAME RETARDANT CORRESPONDING TO THE FORMULA: ##STR2## wherein X is bromo or chloro, Y is halo, hydrogen, or an alkyl, haloalkyl, alkoxy, or haloalkoxy group, and Z is a tetravalent hydrocarbon group containing 4-20 carbon atoms.
Claims12
A composition comprising (A) a rubber-modified polystyrene and (B) a flame-retarding amount of a mixture of about 55-95% by weight of a first flame retardant corresponding to the formula:
- ##STR8## and about 45-5% by weight of a second flame retardant corresponding to the formula:
- ##STR9## wherein X is bromo or chloro, Y is halo, hydrogen, or an alkyl, haloalkyl, alkoxy, or haloalkoxy group, and Z is a tetravalent hydrocarbon group containing 4-20 carbon atoms.
A composition comprising (A) about 87-89 parts by weight of a rubber-modified polystyrene, (B) respectively, about 13-11 parts by weight of a mixture of about 70% by weight of a first flame retardant corresponding to the formula:
- ##STR11## and about 30% by weight of a second flame retardant corresponding to the formula:
- ##STR12## and (C) an amount of antimony trioxide such as to provide a flame retardant/antimony trioxide weight ratio of about 2/1.
Dependencies are inferred from the claim text.