mixtures has high resistance to impact of the poly (butylene terephthalate) and method for their preparation

摘要

A blend comprised of high molecular weight polybutylene terephthalate and up to about 20 wt.% of an aromatic polycarbonate resin wherein the mixture has a drop dart impact strength in excess of about 60 foot-pounds is prepared by intimately mixing the components, one of which is powdered. The polybutylene terephthalate has an intrinsic viscosity of at least about 0.95. The blend will tolerate the addition of up to 20 wt.% of a conventional flame retardant package such as decabromodiphenyl oxide and antimony trioxide while maintaining the 60 foot-pound minimum drop dart impact strength. The blend can achieve impact strengths in excess of 90 foot-pounds even when it contains flame retardant additives if the polybutylene terephthalate is blended in powder form.