Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1990-07-09
1993-11-09
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528125, 528128, 528170, 528171, 528172, 528173, 528185, 528188, 528220, 528229, 528350, 528353, 4284735, 2642884, 2642902, C08G 7310, C08G 6926
Patent
active
052604071
ABSTRACT:
A polyimide film essentially consisting of polyimide having recurring units of the formula (I): ##STR1## which has a density of 1.335 to 1.390 g/cm.sup.3 at 23.degree. C. and/or a refractive index of 1.605 to 1.680 at 23.degree. C. in the direction of thickness and is transparent; and a preparation process of the polyimide film by extruding the polyimide having recurring units of the above formula (I) through a common melt-extrusion process, casting in a chill-roller to obtain an unstretched film, uniaxially or biaxially stretching the unstretched film to cause molecular orientation, and successively setting the stretched film through heat-treatment.
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Database WIPL, No. 87-304105, Derwent Publications Ltd., JP-A-62 214927, whole abstract.
Database WIPL, No. 88-327647, Derwent Publications Ltd., JP-A-63 242625, whole abstract.
CA 113(24): 213463s, "Polyimide Melt Extrusion through tapered Die in Manufacture of film", Tsutsumi, et al, 1990.
Fujii Yasuhiro
Honji Yasuko
Moriya Shinobu
Ohta Yasuhiko
Saruwatari Masumi
Hampton-Hightower P.
Kight III John
Mitsui Toatsu Chemicals Incorporated
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