Process for the preparation of phenol-formaldehyde foams

Details Process for the preparation of phenol-formaldehyde foams Process for the preparation of phenol-formaldehyde foams

1979-05-21

1981-02-24

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521121, 521131, 521136, 521181, 525489, C08J 914

Patent

active

042529085

ABSTRACT:
The present invention relates to a process for the preparation of phenol-formaldehyde foams by mixing a resol phase having a viscosity of between 8 and 60 poises and a novolac phase comprising a true novolac, a blowing agent, phenolsulphonic acid and, optionally, phenol, the relative amounts of resol phase and of novolac phase being such that the resol phase represents 45 to 75% by weight of the mixture.

REFERENCES:
patent: 3870661 (1975-03-01), Crook et al.
patent: 3872033 (1975-03-01), Boden et al.
patent: 3998765 (1976-12-01), Novak et al.

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