Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1995-03-29
1997-04-08
Bleutge, John C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525482, 525485, 525523, 525524, 525533, 525534, 428324, 428364, 428368, 428375, 428377, 428413, 442117, C08F28300, C08G 828, B32B 2738
Patent
active
056188919
ABSTRACT:
A resin composition is provided that is suitable for impregnating sheet material, including fabrics, films, paper and tapes of the type employed to form prepregs, such as tapes used to form electrical insulation layers on electrical components. The resin composition includes a solid or semi-solid epoxy resin having an epoxide functionality of at least 2.5, a metal acetylacetonate for catalyzing the epoxy resin, and an accelerator of bisphenol A-formaldehyde novolac catalyzed by an acidic catalyst and having a hydroxyl equivalent weight of 120. The resin composition is essentially unreactive at room temperature and at elevated temperatures sufficient to enable permeation of the sheet material by the resin in its manufacture, is essentially unreactive at temperatures required to remove moisture and volatiles during processing of articles wrapped or taped with the sheet material, and cures at a higher temperature without adversely affecting the cure characteristics of the resin composition. The resin composition of this invention achieves the desirable reactivity characteristics noted above, while exhibiting enhanced mechanical, thermal and electrical properties necessary for its use within an electrical insulation composite.
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Bleutge John C.
General Electric Co.
Gulakowski Randy
Hartman Domenica N. S.
Lampe, Jr. Robert C.
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