High impact strength blends of polybutylene terephthalate

Details High impact strength blends of polybutylene terephthalate High impact strength blends of polybutylene terephthalate

1975-05-23

1977-08-23

Michl, Paul R.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260 40R, C08L 6702

Patent

active

040440737

ABSTRACT:
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.
The invention also concerns a method of blending a high molecular weight polybutylene terephthalate with an aromatic polycarbonate to produce a high impact strength resin which has the ability to incorporate other additives while maintaining a high impact strength. The method includes blending one of the polybutylene terephthalate or the polycarbonate in powdered form.

REFERENCES:
patent: 3218372 (1965-11-01), Okamura
patent: 3470114 (1969-09-01), Siggel
patent: 3624024 (1971-11-01), Caldwell
patent: 3644271 (1972-02-01), Tully
patent: 3751396 (1973-08-01), Gall
patent: 3833685 (1974-09-01), Wambach
patent: 3835089 (1974-09-01), Fox
patent: 3855277 (1974-12-01), Fox
patent: 3883471 (1975-05-01), Stackman

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