B - Operations – Transporting – 29 – B
Patent
B - Operations, Transporting
29
B
18/768
B29B 9/12 (2006.01) B29B 9/06 (2006.01)
Patent
CA 1261112
PRODUCTION OF IMPROVED PELLETS FROM MELT-PROCESSABLE POLYMER WHICH IS CAPABLE OF FORMING AN ANISOTROPIC MELT Abstract of the Disclosure Improved pellets comprising a melt-processable thermo- tropic liquid crystalline polymer (e.g., a wholly aromatic polyester) are provided. The molten anisotropic melt-forming polymer, while present as a thin film of the specified thickness at an appropriate temperature, is subjected to reduced pressure conditions whereby residual volatiles are evolved and removed, and the polymer thereby is desified to the specified degree prior to pellet formation. The resulting densified polymer next is melt-extruded and is cut to form pellets while at an appro- priate temperature. It surprisingly has been found to be of prime importance that the resulting pellets possess a density of at least 95 percent of the theoretical maximum (e.g., a polymer density of approximately 1.35 to 1.4 gram/cc.) if the advantages of the present invention are to be fully realized. These pellets have been found to be capable of undergoing melt processing to form shaped articles having improved physical properties. For instance, such shaped articles exhibit markedly smoother surface characteristics and can be used at elevated temperatures for extended periods of time while better retaining the desired surface characteristics.
492435
Celanese Corporation
Smart & Biggar
LandOfFree
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