Coating processes – With post-treatment of coating or coating material – Solid treating member or material contacts coating
Patent
1988-05-05
1990-02-06
Bleutge, John C.
Coating processes
With post-treatment of coating or coating material
Solid treating member or material contacts coating
427370, 4273741, 4273742, 4273743, 427379, 4273855, 4273898, 4273899, 4273891, 428287, 428290, 4284735, 523222, 523309, 524600, B29D 900
Patent
active
048987549
ABSTRACT:
A method is disclosed for forming poly(amide-imide) prepregs that permits forming void-free composites having residual solvent contents of less than 0.2% by weight. Such composite have improved glass transition temperatures near those of the pure polymer. In a preferred method, a poly(amide-imide) prepreg containing a residual N-methyl-2-pyrrolidone solvent is rapidly heated to about 650.degree. F. to evaporate residual solvent to less than 1.0% by weight. The prepreg is rapidly cooled before the thermoplastic poly(amide-imide) polymer begins to significantly advance in molecular weight. The prepreg may then be layed up to form composite articles that are consolidatable by application of further heat and pressure.
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Christensen Stephen
Rakel Jay O.
Bleutge John C.
The Boeing Company
Woodward David W.
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