Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1979-02-08
1980-12-09
Lee, Lester L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528194, C08G 6360, C08G 6366
Patent
active
042385989
ABSTRACT:
A novel polyester is provided which has been found to exhibit an anisotropic melt phase at a temperature which enables it readily to undergo melt processing to form quality fibers, molded articles, etc. The polyester of the present invention is different in character than polyesters of the prior art and includes as essential ingredients moieties derived from para-hydroxy benzoic acid, 1,2-bis(para-carboxy phenoxy)ethane, terephthalic acid, and unsubstituted hydroquinone in the proportions indicated. The polyester of the present invention can be produced on a relatively economical basis and has been found capable of yielding an anisotropic melt of relatively low viscosity at a desirable temperature for melt processing. In a preferred embodiment the polyester is capable of undergoing melt processing at a temperature below approximately 300.degree. C., and in a particularly preferred embodiment at a temperature below approximately 290.degree. C. (e.g., with standard equipment commonly used to melt process polyethylene terephthalate). Fibers conveniently can be melt spun from the polyester of the present invention which exhibit tenacity values which are enhanced to a surprisingly great extent upon thermal treatment.
REFERENCES:
patent: 3991013 (1976-11-01), Pletcher
patent: 3991014 (1976-11-01), Kleinschuster
patent: 4067852 (1978-01-01), Calundann
patent: 4083829 (1978-04-01), Calundann et al.
patent: 4118372 (1978-10-01), Schaefgen
patent: 4130545 (1978-12-01), Calundann
patent: 4140846 (1979-02-01), Jackson, Jr. et al.
Fiber Industries Inc.
Lee Lester L.
Sayko Jr. Andrew F.
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