Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1981-06-22
1983-07-19
Kendell, Lorraine T.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
428367, 428375, 428378, 523215, 524600, 4284735, B32B 500, B32B 2706, D02G 300
Patent
active
043944671
ABSTRACT:
Carbon fibers are provided which bear an improved finish coating upon the surface which is capable of withstanding the high temperatures (e.g., above 500.degree. F.) commonly encountered during the formation of composite structures employing a polyimide matrix. The sized carbon fibers prior to the curing to form a rigid polyimide coating are flexible, may be readily handled without significant damage, and are amenable to good impregnation with the matrix resin thereby facilitating the formation of quality composite structures. The finish comprises a mixture of selected precursors for the formation of a rigid polyimide (as described). More specifically, the size composition is formed from at least one aromatic diamine, at least one aromatic dianhydride, and at least one aromatic tetracarboxylic acid diester. A film-forming polyamic acid oligomer readily forms and is present as an intermediate reaction product within the finish coating and the aromatic tetracarboxylic acid diester has been found to beneficially serve primarily as a flexibility preserving diluent during the early stages of the polyimide-forming reaction which takes place within the finish coating. The finish is fully compatible with a polyimide matrix.
REFERENCES:
patent: 3179634 (1965-04-01), Edwards
patent: 3459706 (1969-08-01), Schweitzer
patent: 3597301 (1971-08-01), Blanc et al.
patent: 3770539 (1973-11-01), Bullock
patent: 3837904 (1974-09-01), Hill
patent: 3914504 (1975-10-01), Weldy
patent: 3957716 (1976-05-01), Weldy
patent: 4146668 (1979-03-01), Dorey et al.
"Low Void Composites Based on NR-150 Polyimide Binders" by Gibbs; Hugh H., 28th Annual Technical Conference, 1973, Reinforced Plastics/Composites Institute, The Society of the Plastic Industry, Inc., Section 2D-pp. 1-3.
"The Development of Quality Control Techniques For NR-150 Polyimide Adhesive and Binder Materials" by Hugh H. Gibbs et al., pp. 11-17, Sample Journal, Jan., Feb., 1979.
Du Pont, NR-150 Polyimide Precursor Solutions, Bulletin No. 783, revised Mar. 1979, "4,4'-Oxydianiline (ODA)".
Celanese Corporation
Kendell Lorraine T.
Price Herbert P.
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