Thermotropic copolyester from mixture of hydroxy benzoic acids

Details Thermotropic copolyester from mixture of hydroxy benzoic acids Thermotropic copolyester from mixture of hydroxy benzoic acids

1989-05-30

1990-11-13

Anderson, Harold D.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

525437, 525450, 528176, 528191, 528271, 528272, 528480, 528481, 528483, C08G 6300, C08G 6302, C08G 6318, C08G 6700

Patent

active

049702858

ABSTRACT:
A thermotropic copolyester, showing a liquid-crystalline structure of nematic type within a desired temperature range, contains units deriving from:
(a) a saturated bicarboxy aliphatic acid;
(b) 4,4'-di-hydroxydipheryl;
(c) 4-hydroxybenzoic acid; and
(d) 4-hydroxy-benzoic acid bearing an alkyl substituent or a halogen atom bonded to the aromatic ring.
Such a copolyester constitutes a material endowed with self-reinforcing characteristics, originating, through the usual transformation processes by injection or by extrusion techniques, marked molecular orientations, which supply the manufactured articles with high stiffness characteristics.
Said material can be also used as a reinforcing agent when is mixed, by means of the usual techniques, with the traditional thermoplastic polymers.

REFERENCES:
patent: 4390681 (1983-06-01), Deex

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