Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1996-01-11
1997-05-20
Krass, Frederick
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525526, 528111, 528122, 564306, C08G 5918, C08G 5950
Patent
active
056313322
ABSTRACT:
A curing agent for epoxy resins, prepared by reacting 2,5- and 2,6-bis(aminomethyl)-bicyclo[2.2.1]heptanes (1 equivalent of the active hydrogen in the amino group) with an epoxy resin (a reaction product of bisphenols or a novolak resin with epichlorohydrin; an epoxy equivalent of 150-300 g/eq.; two or more epoxy groups per molecule; bisphenol-A diglycidyl ether or bisphenol-F diglycidyl ether in particular)(0.025-0.50 equivalents of the epoxy group). The reaction temperature is 40.degree.-120.degree. C. The amount of the curing agent is within the range of 20-75 parts by weight relative to 100 parts by weight of an epoxy resin to be cured. The curing agent has a high curing rate at a room temperature, and the epoxy resins cured by it have a good appearance as well as excellent adhesion, water resistance, and chemical resistance. Therefore, the curing agent is suitable for paints, civil engineering and construction materials, adhesives, casting resins, laminates, etc.
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patent: 3629181 (1971-12-01), Heer et al.
patent: 5087722 (1992-02-01), Inomata et al.
Database WPI, Week 9217, Derwent Publications Ltd., London, GB; AN 92-138016 XP 002007039 & JP-A-04080228 (Mitsui Toatsu Chemicals, Inc.), Mar. 13, 1992 *Abstract*.
Database WPI, Week 7908, Derwent Publications Ltd., London, GB; AN 79-14693 XP002007040 & JP-A-54004992 (Japan Geon KK), Jan. 16, 1979 *Abstract*.
Database WPI, Week 9337, Derwent Publications Ltd., London, GB; AN 93-290563 XP002007041 & JP-A-05171127 (Mitsui Toatsu Chemicals, Inc.), Jul. 9, 1993 *Abstract*.
B. Ellis, Editor, "Chemistry and Technology of Epoxy Resins", 1993, Blackie Academic & Professional, London, GB XP002007038, pp. 42, 43 and 53.
Karasawa Minato
Shimizu Takuji
Krass Frederick
Mitsui Toatsu Chemicals Inc.
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