Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1990-04-12
1991-11-19
Nielsen, Earl
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
528 88, 528 89, 528 90, 528 91, 528 93, 528 94, 528 98, 528 99, 528102, 528103, 528104, 428416, 428418, C08G 5900, C08G 6508, C08G 6514
Patent
active
050667351
ABSTRACT:
Electrical laminates are prepared from prepreg materials prepared by impregnating a substrate with a laminating varnish comprising a solvent solution of a curable composition comprising (A) a mixture of at least one epoxy resin having an average of more than 1 but not more than 2 vicinal epoxy groups per molecule and at least one epoxy resin having an average of more than 2 vicinal epoxy groups per molecules; (B) a mixture of at least one phenolic hydroxyl-containing compound having an average of more than 1 but not more than 2 phenolic hydroxyl groups per molecule and at least one phenolic hydroxyl-containing compound having an average of more than 2 phenolic hydroxyl groups per molecule; and (C) at least one catalyst for effecting the reaction between (A) and (B).
REFERENCES:
patent: 4868059 (1989-09-01), Walker et al.
patent: 4874669 (1989-10-01), Larson et al.
patent: 4959425 (1990-09-01), Walker et al.
Larson Paul A.
Walker Louis L.
Krass Frederick
Nielsen Earl
The Dow Chemical Company
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