C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/5703
C08L 67/04 (2006.01)
Patent
CA 1269472
ABSTRACT OF THE DISCLOSURE A process for producing a polymer blend which exhibits an anisotropic melt phase and is capable of forming shaped articles having satisfactory mechanical properties is provided. The process comprises the steps of (a) post-polymerizing a melt processable wholly aromatic polyester which is capable of forming an anisotropic melt phase apart from the blend and (b) subse- quently intimately mixing together approximately 85 to 95 percent by weight of the wholly aromatic polyester and approximately 5 to 15 percent by weight of a polyalkylene terephthalate. The post- polymerizing step is conducted at a temperature and for a period of time sufficient to increase the inherent viscosity of the wholly aromatic polyester by at least approximately 50 percent, preferably by at least approximately 100 percent. The polyalky- lene terephthalate is preferably polyethylene terephthalate. The present invention further provides a polymer blend which is capable of exhibiting an anisotropic melt phase and the ability to form shaped articles having satisfactory mechanical properties. The blend comprises (a) approximately 5 to 15 per- cent by weight of a polyalkylene terephthalate and (b) approxi- mately 85 to 95 percent by weight of a melt processable wholly aromatic polyester which is capable of forming an anisotropic melt phase apart from the blend, the wholly aromatic polyester having been subjected prior to blending to post-polymerization so as to increase the inherent viscosity thereof by at least approximately 50 percent. The blend preferably comprises approximately 10 percent by weight of the polyalkylene terephtha- late and approximately 90 percent by weight of the melt process- able wholly aromatic polyester.
448882
Berardinelli Frank M.
Cincotta David E.
Berardinelli Frank M.
Celanese Corporation
Cincotta David E.
Smart & Biggar
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