Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1992-07-30
1994-06-07
Bleutge, John C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528 93, 5281113, 525423, 525530, 525533, C08G 5944
Patent
active
053190629
ABSTRACT:
An improvement is proposed in the curing method of an epoxy resin by the admixture of a polyamide as a crosslinking curing agent, in which the curing agent as well as the epoxy resin composition with admixture of the curing agent has an outstandingly low viscosity as compared with the use of a conventional polyamide to facilitate handling. The improvement can be obtained by using, as the polyamide, a condensation reaction product between (A) an alkylene polyamine having 4 to 20 carbon atoms in a molecule and (B) a dimeric acid mixture containing at least 50% by weight of a non-cyclic dimeric acid or an alkyl ester thereof represented by the general formula ##STR1## in which each R is, independently from the other, a hydrogen atom or a C.sub.1-4 alkyl group obtained by the dimerization reaction of oleic acid or an alkyl ester thereof. When flexibility or bendability is desired of the cured epoxy resin, the condensation reaction is performed, in addition to the reactants (A) and (B), with admixture of a C.sub.5-21 monobasic carboxylic acid or an alkyl ester thereof.
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Kigawa Hitoshi
Ohishida Akira
Bleutge John C.
Gulakowski Randy
Lion Corporation
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