| 摘要 |
Polyesters and copolyesters, derived from the reaction of a dicarboxylic acid or lower alkyl ester thereof with a glycol, which possess improved flame retardant properties as a result of the addition to said polyesters and copolyesters of a synergistic mixture consisting of (1) from 1 to 10 percent by weight of a polyhalogenated aromatic compound selected from the group consisting of halogenated benzene, biphenyl and naphthalene compounds and (2) from 0.1 to 3.0 percent by weight of at least one alkali metal tetrafluoroborate.
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