Linear, phosphorus-containing copolyester, process for its prepa

Details Linear, phosphorus-containing copolyester, process for its prepa Linear, phosphorus-containing copolyester, process for its prepa

1989-03-17

1991-01-01

Kight, III, John

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

Synthetic resins

From carboxylic acid or derivative thereof

528286, 528287, 528302, 528305, 528308, 5283081, 5283086, 525439, 525444, 524123, 524126, 524706, 524710, 106 1814, 106 1818, C08G 6302

Patent

active

049819453

ABSTRACT:
A linear copolyester, useful as a flame retardant agent, contains in its macromolecule units derived from:
(a) terephthalic acid;
(b) (C.sub.2 -C.sub.6)-alkylene glycol;
(c) phenyl-hydroxymethylene phosphinic acid, in a mutual ratio comprised within the range of from 1:1:0.2 to 1:1:1, and is obtained by placing a linear polyester derived from terephthalic acid and a (C.sub.2 -C.sub.6)-alkylene glycol into contact with a poly(phenylhydroxymethylene phosphinate) (I): ##STR1## wherein: Ph is the phenyl radical;
R is a hydrogen atom or a linear or branched alkyl radical containing from 1 to 8 carbon atoms; and
D is from 2.5 to 100,
under melting conditions, and for a contact time not longer than about 30 minutes.
Such a copolyester contains the (c) units randomly distributed throughout the macromolecular chain, has an amorphous or partially crystalline structure as a function of its content of said (c) unit, and is useful in order to endow the linear polyesters, also in mixture with one another (polymeric alloys), with flameproof characteristics.

REFERENCES:
patent: 4087403 (1978-05-01), Moedritzer
patent: 4517355 (1985-05-01), Mercati et al.
patent: 4812502 (1989-03-01), Cipriani et al.

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