Method for producing phenol resin foams and method of making foa

Details Method for producing phenol resin foams and method of making foa Method for producing phenol resin foams and method of making foa

1989-05-25

1991-04-16

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521181, C08G 1814

Patent

active

050082973

ABSTRACT:
In a method for producing resol type phenol resin foams by using starting material for the foams prepared by blending a resol type phenol resin, a blowing agent and a catalyst, a low molecular weight resol type phenol resin with the number average molecular weight of less than 200 and a high molecular weight resol type phenol resin with the number average molecular weight of greater than 200 are mixed at a weight ratio of from 5/95 to 80/20 and used as the resol type phenol resin. The resol type phenol resin foams are excellent in adhesion, fire-proofness capable of foaming cure in a short time and useful for sprayed-in-place foaming, etc. The phenol resin foams produced by the invention are capable of integral foaming with rigid urethane resin foam layer into foamed laminates of excellent thermal insulation, fire-proofness, etc.

REFERENCES:
patent: 4539338 (1985-09-01), Carlson et al.
patent: 4694028 (1987-09-01), Saeki et al.

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