Phenol formaldehyde resins, their manufacture and use

Details Phenol formaldehyde resins, their manufacture and use Phenol formaldehyde resins, their manufacture and use

1977-01-24

1979-01-02

Person, Sandra M.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

528129, C08G 810, C08G 828

Patent

active

041326997

ABSTRACT:
Low molecular weight liquid phenol formaldehyde resins and processes for producing them are described. Preferred products are used as foundry binders and are made by forming a low molecular weight liquid novolak, removing free phenol while retaining a low molecular weight, and reacting with additional formaldehyde in the presence of an alkaline catalyst under conditions that yield a low molecular weight.

REFERENCES:
patent: 1737917 (1929-12-01), Cherry
patent: 2180981 (1939-11-01), Fiedler
patent: 2658054 (1953-11-01), Coleman et al.
patent: 3189566 (1965-06-01), Shinjo

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