Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1995-01-20
1996-06-11
Clark, W. Robinson H.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525481, 525489, 525491, 525501, 525523, C08L 6106, C08L 6110, C08L 6104, C08L 6302
Patent
active
055256848
ABSTRACT:
A phenolic resin composition comprises a mixture of 100 parts by weight of a phenol aralkyl resin and 5 to 60 parts by weight of a novolak type phenolic resin having a content of binuclear components of not more than 10% by area, and a content of trinuclear components of not less than 50% by area and a sum content of tri- and tetra-nuclear components of 75% by area based on the total novolak phenolic resin except for the binuclear components, and an epoxy-cured product obtained by curing an epoxy resin while using the phenolic resin composition as set forth in claim 1 as a curing agent. The phenolic resin composition has a low viscosity and, when it is used as a curing agent for epoxy resins, the resulting epoxy-cured product has a low water absorption rate, is excellent in resistance to moisture and has a high glass transition temperature as compared with the cured product obtained using a novolak type phenolic resin as a curing agent.
REFERENCES:
patent: 5395915 (1995-03-01), Iimuro, et al.
Database WPI, Week 9141, Derwent Publications Ltd., London, GB; AN 91-298813 & JP-A-3197551 (Mitsui Toatsu Chemicals, Inc.) Aug. 28, 1991 *Abstract*
Database WPI, Week 9322, Derwent Publications, Ltd., London, GB; AN 93-177794 (Mitsui Toatsu Chemicals, Inc.) Apr. 27, 1993 *Abstract*.
Chemical Abstracts, vol. 120, No. 22, May 30, 1994, Columbus, Ohio, US; *Abstract* & JP-A-5320290 (Arakawa Chem. Ind.) Dec. 3, 1993.
Iimuro Shigeru
Kawabata Tomoyuki
Yuasa Teruo
Clark W. Robinson H.
Mitsui Toatsu Chemicals Inc.
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