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AssigneeCelanese Corporation
InventorGordon W. Calundann
Estimating the term…
A novel polyester is provided which has been found to exhibit an optically anisotropic melt phase at a temperature which enables it readily to undergo melt processing to form quality molded articles, etc. The polyester of the present invention is formed primarily of recurring 6-oxy-2-naphthoyl and m-oxybenzoyl moieties in the proportions indicated. The hydrogen atoms present upon the aromatic rings of these moieties optionally may be at least partially substituted (as described). Also, minor amounts of other ester-forming moieties may be included in the polyester so long as the optically anisotropic character in the melt and ease of melt processability are retained. In a preferred embodiment the wholly aromatic polyester is capable of undergoing melt processing at a temperature below approximately 370.degree. C., and in a particularly preferred embodiment at a temperature of approximately 280.degree. to 320.degree. C.
A melt processable wholly aromatic polyester capable of forming an optically anisotropic melt phase at a temperature below approximately 400.degree. C. consisting essentially of the recurring moieties I and II which may include substitution of at least some of the hydrogen atoms present upon an aromatic ring wherein:
A melt processable wholly aromatic polyester capable of forming an optically anisotropic melt phase at a temperature below approximately 370.degree. C. consisting essentially of the recurring moieties I and II which may include substitution of at least some of the hydrogen atoms present upon an aromatic ring wherein:
A melt processable wholly aromatic polyester capable of forming an optically anisotropic melt phase at a temperature below approximately 350.degree. C. consisting of the recurring moieties I and II which are free of ring substitution wherein:
Dependencies are inferred from the claim text.