Process for production of phenolic resin modified with liquid po

Details Process for production of phenolic resin modified with liquid po Process for production of phenolic resin modified with liquid po

1980-10-01

1982-06-22

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...

428521, 525328, 528159, C08L 6114

Patent

active

043363474

ABSTRACT:
A process for the production of a phenolic resin modified with a liquid polybutadiene being useful as an impregnating varnish in the production of a copper-clad laminate for a printed circuit, which comprises preparing an adduct of a liquid polybutadiene having a number average molecular weight of 150 to 5,000 with an .alpha., .beta.-unsaturated dicarboxylic acid or its anhydride, subjecting the adduct to an addition reaction with one or plurality of phenols in the presence of an acid catalyst to obtain a composition and reacting the composition with formaldehyde in the presence of a basic catalyst.

REFERENCES:
patent: 3887641 (1975-06-01), Tsuchiya et al.

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