Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1989-05-18
1992-05-26
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528125, 528126, 528128, 528170, 528171, 528172, 528183, 528184, 528185, 528186, 528188, 528208, 528220, 528226, 528229, 528322, 528331, 528, 528352, 528353, 526259, 526261, 526262, 525425, 525436, C08G 7310, C08G 7312, C08G 802, C08G 6908
Patent
active
051169355
ABSTRACT:
A preferred class of polyimide oligomers include (1) linear, difunctional crosslinking oligomers prepared by condensing an imidophenylamine end cap with a lower alkylene diamine or a polyaryldiamine such as 3,3'-phenoxyphenylsulfone diamine and with a dianhydride, particularly 4,4'-phenoxyphenylsulfone dianhydride; and (2) multidimensional, crosslinking, polyimide oligomers having an aromatic hub and at least two radiating arms connected to the hub, each arm including a crosslinking imidophenylamine end cap at its distal end and at least two imide linkages.
Blends, prepregs, and composites can be prepared from the oligomers.
Also described is a method for improving the thermal stability of composites prepared from linear and multidimensional polyimide oligomers and blends which includes the steps of (a) impregnating a fabric with a polyimide oligomer or blend to form a prepreg; (b) heating the prepreg at an elevated temperature and under pressure for a time sufficient to cure the prepreg and form a composite; and (c) post-curing the composite at a temperature of approximately 700.degree. F. and for a time sufficient to improve the thermal stability thereof.
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Lubowitz Hyman R.
Sheppard Clyde H.
Hampton-Hightower P.
Kight III John
The Boeing Company
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