B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/521
B29C 47/20 (2006.01) C08G 63/06 (2006.01) C08J 5/18 (2006.01)
Patent
CA 1313930
Abstract of the Disclosure A wholly aromatic polyester film, (A) which is made of a wholly aromatic polyester consisting essen- tially of the following recurring units I and II Image ...I and Image ... II wherein the aromatic ring may be optionally substituted with at least one substituent selected from the group consisting of an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, a halogen atom and a phenyl group, said wholly aromatic polyether comprising 10 to 90 mol % of the recurring unit I and 90 to 10 mol % of the recurring unit II, being capable of forming an optically anistropic melt phase, and having a melt strength at a temperature 20 °C higher than its transition temperature to liquid crystal of at least 2.0 g/mm2; (B) said film having an oxygen permeability of not more than 1.0 cc?20µ/m2?day?atm at a temperature 20°C and a relative humidity 65 %; and (C) said film having thermal shrinkages both in the machine direction and in a direction perpendicular thereto of not more than 1 % at a temperature 250 °C. Said said wholly aromatic polyester film can be produced by melt-extruding a wholly aromatic polyester to form into a film under conditions that a shear rate applied to the wholly aromatic polyester in a molten state at the exit of the molding die is not less than 500 sec -1.
602811
Ishii Toshinori
Sato Masanori
Kirby Eades Gale Baker
Kuraray Co. Ltd.
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