Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1992-05-21
1994-02-15
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525420, 525425, 525432, 525434, 525436, 428288, 428290, 4284735, 528173, 528331, 528332, C08F28304, C08G 7310, C08L 7706
Patent
active
052868117
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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