Phenolic resins

Details Phenolic resins Phenolic resins

1975-03-24

1977-03-01

Czaja, Donald E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 57A, 260 59R, C08G 234, C08G 810, C08L 6110

Patent

active

040101630

ABSTRACT:
A new process for the preparation of hardenable phenolic resins which are substantially free from unreacted phenol and unreacted formaldehyde and which liberate at most only trace quantities of formaldehyde on hardening comprises reacting novolaks containing methylene bridges which are substantially free from unreacted phenol with formaldehyde in the presence of from 0.15 to 1 equivalent (based on the number of phenolic hydroxy groups) of a basic catalyst at 20.degree. to 70.degree. C. The phenolic resin products may be used wherever conventional phenolic resins have previously been used, an important application being the preparation of aqueous emulsions for use as coating materials and impregnating agents.

REFERENCES:
patent: 2470130 (1949-07-01), Bender et al.
patent: 2885386 (1959-05-01), Straka et al.
patent: 3419527 (1968-12-01), Akutin et al.
patent: 3476707 (1969-11-01), Culbertson et al.
patent: 3766100 (1973-10-01), Meyer-Stoll et al.
patent: 3823103 (1974-07-01), Harding
Modern Plastics Encyclopedia 1968 (McGraw--Hill) (N.Y.) (Sept. 1967) p. 495.
Whitehouse et al., Phenolic Resins (2nd ed.) (Iliffe Books Ltd.) (London) (1967), pp. 85--86.

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