Process for preparation of a phenolic-polybutadiene-HCHO resin c

Details Process for preparation of a phenolic-polybutadiene-HCHO resin c Process for preparation of a phenolic-polybutadiene-HCHO resin c

1979-06-12

1981-09-22

Schain, Howard E.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

260 328R, 260 332R, 260 334R, 260 336R, 260 338R, 428436, 428443, 428460, 428524, 428531, 528145, 528146, 528152, 528159, C08G 812, C08G 830

Patent

active

042911486

ABSTRACT:
Process for the preparation of a phenol resin modified with a liquid polybutadiene which comprises reacting a polybutadiene having a number average molecular weight of 150 to 5,000 with a phenol in the presence of an acid catalyst to obtain a composition which consists of a polybutadiene-phenol adduct and unreacted phenol, in said polybutadiene-phenol adduct, one molecule of phenol per 3 to 8 butadiene units being added to the polybutadiene, and reacting the composition of a polybutadiene-phenol adduct with a formaldehyde in the presence of a basic catalyst, said basic catalyst comprising a primary amine of the formula: R--NH.sub.2 wherein R is a hydrocarbon group having 1 to 20 carbon atoms in an amount of 0.01 to 0.5 mole per 1 mole of the phenol used for the preparation of the composition which is used alone or in combination thereof with other basic compound. Said resin composition thus prepared is useful for the preparation of a laminated sheet having excellent curing characteristics, particularly excellent electrical characteristics, punchability and flexibility.

REFERENCES:
patent: 2465299 (1949-03-01), Wachter
patent: 2631140 (1953-03-01), Bloch
patent: 2827946 (1958-03-01), Christenson et al.
patent: 2843565 (1958-07-01), Christenson et al.
patent: 2843566 (1958-07-01), Christenson et al.
patent: 2948702 (1960-08-01), Vogel et al.
Chem. Abstracts, vol. 83, 1975, 206986y, Dear et al.

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