Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From ketone or ketene reactant
Patent
1979-11-07
1981-07-28
Schain, Howard E.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From ketone or ketene reactant
264137, 4284735, 528222, C08G 1200, C08G 1600, C08G 7310
Patent
active
042811023
ABSTRACT:
An improvement of addition polyimides wherein an essentially solventless, high viscosity laminating resin is synthesized from low-cost liquid monomers. The improved process takes advantage of a reactive, liquid plasticizer such as monoethylphthalate (MEP) which is used in lieu of an alcohol solvent, and helps solve a major problem of maintaining good prepreg tack and drape, or the ability of the prepreg to adhere to adjacent plies and conform to a desired shape during the layup process. This improvement results in both longer life of the polymer prepreg and the processing of low-void laminates and appears to be applicable to all addition polyimide systems.
REFERENCES:
patent: 3803081 (1974-04-01), Lubowitz
patent: 4070312 (1978-01-01), Galiani
patent: 4166170 (1979-08-01), St. Clair
Butler John M.
Frosch Robert A. Administrator of the National Aeronautics and Space
St. Clair Terry L.
Manning John R.
Nelson Wallace J.
Osborn Howard J.
Schain Howard E.
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