Self-extinguishing and thermostable copolyesters and process for

Details Self-extinguishing and thermostable copolyesters and process for Self-extinguishing and thermostable copolyesters and process for

1978-02-15

1980-06-24

Lee, Lester L.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

260 457PS, 260 457P, 260 457PH, 528167, 528173, 528191, C08G 6366, C08G 6368

Patent

active

042096065

ABSTRACT:
A flame resistant and self-extinguishing copolyester composition is made by opolycondensing a dicarboxylic aromatic acid or its diester, a saturated aliphatic diol, a tetrabrominated diol and a sulphonated aromatic compound, preferably in the presence of a phosphor derivative as a complexing and stabilizing agent. Preferably the acid is terephthalic acid and the saturated diol is ethylene or butylene glycol. The viscosity of the copolyester is from 0.3 to 0.6 dl/g and preferably not less than 0.4 or more preferably 0.45 dl/g and its bromine and sulphur contents are 0.1-12% and 0.05-1% by weight respectively, the phosphor, if any, not exceeding 1%. A marked synergic effect of the concurrent presence of bromine and sulphur is evidenced by combustion tests.

REFERENCES:
patent: 3794617 (1974-02-01), Mains et al.
patent: 3873504 (1975-03-01), Boettcher et al.
patent: 3935166 (1976-01-01), Kanai et al.

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