Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1981-06-04
1982-10-19
Lee, Lester L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524601, 528125, 528128, 528176, 528190, 528191, 528193, 528194, 528206, 528271, C08G 6360
Patent
active
043551343
ABSTRACT:
An improved wholly aromatic polyester is provided which exhibits an anisotropic melt phase and which is capable of readily undergoing melt processing. The wholly aromatic polyester consists essentially of the recurring units (a) p-oxybenzoyl moiety, (b) 2,6-dioxynaphthalene moiety, (c) 2,6-dioxyanthraquinone moiety, and (d) terephthaloyl moiety in the concentrations indicated. The resulting polymer is substantially free of aromatic rings possessing ring substitution and meta disposed linkages in the polymer chain. The present invention represents an improvement over the polyester of U.S. Pat. No. 4,184,996 since the melt phase may be formed at an advantageously reduced temperature thereby better facilitating the use of standard melt processing equipment when forming fibers, films, three-dimensional shaped articles, etc. The reduction in possible melt processing temperature is accomplished without any significant diminution in melt anisotropy such as that which would result if non-symmetrical meta disposed linkages were present in the polymer chain. Also, the present polyester does not rely upon the presence of ring substitution as a means for producing the desired melt anisotropy.
REFERENCES:
patent: 4188476 (1980-02-01), Irwin
patent: 4224433 (1980-09-01), Calundann et al.
Calundann Gordon W.
Charbonneau Larry F.
Celanese Corporation
Lee Lester L.
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