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Phosphorus- and metal-containing poly(ethylene terephthalate)—1. Phosphorus- and calcium-containing polymer

✍ Scribed by K. Troev; Ts. Kisiova; At. Grozeva; G. Borisov

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
361 KB
Volume
29
Category
Article
ISSN
0014-3057

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✦ Synopsis

The calcium salt of the monoethyl ester of phosphonic acid was used as a comonomer for synthesizing poly(ethylene tetrephthalate), containing an ionic bond in its main chain. It was established that higher P and Ca contents reduce the relative viscosity and increase the content of oligomers and diethylene glycol. With 0.4% P and 0.25% Ca, the modified resin has the following characteristics: ~ = 1.384; --COOH ~ 54.27 mg eqv. KOH/g × 10-+; m.p. 241-242°; oligomers ffi 3.24%; diethylene glycol = 6.09%. The comonomer gives a thermostabilizing effect. The modified resin has improved flame resistance.

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