Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1995-06-02
1996-04-23
Marquis, Melvyn I.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528129, 528137, 528143, 528155, 525480, 525481, 525501, 525534, C08G 804, C08G 1404
Patent
active
055104460
ABSTRACT:
A naphthol-modified phenolic resin having low softening point and good flowability is obtained by allowing a naphthol and a phenol to react with an aldehyde in the presence of an acid catalyst at 60 to 110.degree. C. to obtain a primary reaction mixture, heating the primary reaction mixture in the presence of a strong acid, a super acid or a mixture thereof under ambient pressure at 120 to 180.degree. C. for 1 to 12 hours to obtain a secondary reaction mixture, and subjecting the secondary reaction mixture to vacuum concentration or steam distillation, and the naphthol-modified phenolic resin is suited to use as a curing agent in epoxy resin molding materials for sealing electronic parts.
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patent: 5302673 (1994-04-01), Naka et al.
Hagiwara Shinsuke
Saitoh Hiroyuki
Sue Haruaki
Gulakowski Randy
Hitachi Chemical Company Ltd.
Marquis Melvyn I.
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