Thermally stable diphosphonate-type flame retardant additive for

Details Thermally stable diphosphonate-type flame retardant additive for Thermally stable diphosphonate-type flame retardant additive for

1987-07-23

1990-03-20

Hoke, Veronica P.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

C08K 553

Patent

active

049102400

ABSTRACT:
Flame retardant polyester compositions are prepared by incorporating into a polymer from 1-20% by weight of a flame retardant having the structural formula: ##STR1## where Ar is aryl and R and R' are independently alkylene. This class of flame retardant shows high temperature stability and permits incorporation of the flame retardant into the polyester by hot milling at temperatures up to about 390.degree. C.

REFERENCES:
patent: 2632756 (1953-03-01), Harman et al.
patent: 3256370 (1966-06-01), Fitch
patent: 3463835 (1969-08-01), Burdnick
patent: 3830890 (1974-08-01), Kerst et al.
patent: 3900536 (1975-08-01), D'Alelio
Sommer: CA 90, 168,732x, (1979).

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