Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1989-06-14
1991-10-01
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
264291, 528 86, 528271, C08G 6306
Patent
active
050534815
ABSTRACT:
A wholly aromatic polyester film, (A) which is made of a wholly aromatic polyester consisting essentially of the following recurring units I and II ##STR1## 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 polyetser comprising 10 to 90 mol % of the recurring unit I and 90 to 10 mol % of the recurring unti II, being capable of forming an optically anisotropic melt phase, and having a melt strength at a temperature 20.degree. C. higher than its transition temperature to liquid crystal of at least 2.0 g/mm.sup.2 ; (B) said film having an oxygen permeability of not more than 1.0 cc. 20 .mu./m.sup.2. day. atm at a temperature 20.degree. 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.degree. C. 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.sup.-1.
REFERENCES:
patent: 4161470 (1979-07-01), Calundann
patent: 4673724 (1987-06-01), Endoh et al.
Ishii Toshinori
Sato Masanori
Anderson Harold D.
Kuraray Co. Ltd.
LandOfFree
Wholly aromatic polyester film does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Wholly aromatic polyester film, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wholly aromatic polyester film will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1755689