Moisture resistant laminates impregnated with an impregnating co

Details Moisture resistant laminates impregnated with an impregnating co Moisture resistant laminates impregnated with an impregnating co

1981-01-23

1982-04-27

Dixon, Jr., William R.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

1563074, 1563075, 156330, 174 685, 427386, 4273899, 427394, 428248, 428251, 428901, 4273855, B32B 700, H05K 100, C09J 502, B05D 302

Patent

active

043271430

ABSTRACT:
A resin impregnated, B-staged sheet material free of crystal formations, useful for metal clad and unclad laminate production, is made by impregnating a sheet containing a resin comprising epoxy resin and an amount of curing agent effective to cure the epoxy resin to the C-stage, where the curing agent consists essentially of the reaction product of dicyandiamide and an aminophylic reagent selected from the group consisting of aldehydes, alkyl monoglycidyl ethers having the formula: ##STR1## where R=an alkyl group having from 1 to 4 carbon atoms, styrene oxide, ethylene oxide, propylene oxide, acetic anhydride, benzoyl chloride, acetyl chloride, and mixtures thereof, and then heating the impregnated sheet until the resin is in the B-stage.

REFERENCES:
patent: 2801672 (1957-08-01), Baldwin et al.
patent: 3732286 (1973-05-01), Son et al.
patent: 3759914 (1973-09-01), Simms et al.
patent: 3895158 (1975-07-01), Gause
patent: 4076869 (1978-02-01), Flynn
Kitagawa, C, "Studies on Dicyanodiamide (First Report) on the Condensation Reaction with Formaldehyde", Journal of the Society of the Chemical Industry (Japan), 45, 416-419 (1942).

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