Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1979-06-20
1980-08-26
Schain, Howard E.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
260 293, 528144, C08G 808
Patent
active
042196345
ABSTRACT:
Water-immiscible thermosetting phenol-formaldehyde resins in which a large proportion of the linkages between the benzene rings are benzyl ether linkages located ortho to the phenolic hydroxyl groups are produced by reaction of at least 1 mole of formaldehyde with 1 mole of phenol in an aqueous reaction medium in the presence of a metal carboxylate catalyst, such as, zinc acetate, in two stages, in which, in the first stage exothermic addition of formaldehyde to phenol occurs and, in the second stage, methylol phenol is polymerized to form the resin. Methods for control of the rate of polymerization, methods of separation of product resin from aqueous phase, methods of molecular weight distribution control, a semi-continuous operation and an alternative polymerization procedure are described.
REFERENCES:
patent: 4017437 (1977-04-01), Vasishth et al.
patent: 4022942 (1977-05-01), Anderson et al.
patent: 4036816 (1977-07-01), Vasishth et al.
patent: 4045411 (1977-08-01), Vasishth et al.
Cor Tech Research Ltd.
Schain Howard E.
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