Polyethylene terephthalate molding composition having reduced fl

Details Polyethylene terephthalate molding composition having reduced fl Polyethylene terephthalate molding composition having reduced fl

1980-10-07

1982-10-26

Hoke, V. P.

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

525165, C08L 509

Patent

active

043562817

ABSTRACT:
The flame retardancy of a polyethylene terephthalate ester molding composition is improved by mixing therewith both a salt of oxalic acid and polytetrafluoroethylene having a number average molecular weight Mn of more than 10.sup.5. The oxalic acid salt has the formula K.sub.3 [Al(C.sub.2 O.sub.4).sub.3 ], K.sub.2 [Mg(C.sub.2 O.sub.4).sub.2 ] or Rb.sub.3 [Al(C.sub.2 O.sub.4).sub.3 ]. The preferred composition contains from 5-15% by weight of the oxalic acid salt and 0.1-0.5% by weight of polytetrafluoroethylene. The composition having improved flame retardancy may be used to advantage for making shaped articles by injection molding.

REFERENCES:
patent: 3671487 (1972-06-01), Abolins
patent: 3723373 (1973-03-01), Lucas
patent: 4169827 (1979-10-01), Gerlach et al.
patent: 4191678 (1980-03-01), Smith
patent: 4257929 (1981-03-01), Borman
Lewin et al. -Flame-Retardant Polymeric Materials-pp. 445-446, Plenum Press (1975).

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