Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1987-06-22
1989-10-24
Pertilla, Theodore E.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
427 96, 4284251, 4284253, 428901, C08F28304, C08L 6100
Patent
active
048763195
ABSTRACT:
The invention relates to a synthetic resin composition comprising a phenol-formaldehyde resin and a polyurethane component, and to a substrate material for printed circuit boards, comprising a fibrous carrier material which is impregnated with such a synthetic resin composition derived from the reaction of a phenol and a formaldehyde-producing compound in the presence of the polyurethane component and a basic catalyst to form an interpolymer which upon further processing yields a substrate material which is on the one hand suitable to be provided with holes by punching and piercing and on the other is not subject to an objectionable degree of sagging during the soldering of components onto the printed circuit board by means of a wavesoldering bath.
REFERENCES:
patent: 4173594 (1979-11-01), Dyszlewski
patent: 4440833 (1984-04-01), Franz et al.
Bartlett Ernestine C.
Pertilla Theodore E.
U.S. Philips Corp.
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