C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/57
C08G 8/10 (2006.01)
Patent
CA 1149548
CONTROL OF PROCEDURES FOR FORMATION OF WATER-IMMISCIBLE THERMOSETTING PHENOL-FORMALDEHYDE RESINS ABSTRACT OF THE DISCLOSURE 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.
291605
Cor Tech Research Ltd.
Sim & Mcburney
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