Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1997-12-15
2000-09-26
Dawson, Robert
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524100, 528 94, C08K 518
Patent
active
061243817
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an epoxy-based resin composition, particularly, an epoxy/acid anhydride composition which has quick-curability and storage stability for a long term, and an epoxy/acid anhydride resin composition prepared by thermosetting the epoxy/acid anhydride composition. The epoxy/acid anhydride composition of the present invention is useful for an improvement of workability in curing and physical properties for casting materials, laminating materials, molding compound for encapsulation, resin for embedding, adhesives, and coatings, etc.
BACKGROUND ART
An epoxy resin has been widely employed as adhesives, coatings, casting materials, molding compound for encapsulation, resin for embedding, and laminating materials because of an excellent adhesive property with metallic materials and glass, high mechanical strength, and excellent workability in curing, etc.
An epoxy resin is designed as being cured by mixing with an amine-curing agent, a mercaptan-curing agent, a phenol resin-curing agent, and an acid anhydride-curing agent in response to the uses of the epoxy resin, and those are occasionally employed together with a tertiary amine-, quaternary ammonium-, tertiary phosphine-, imidazole-, and azabicyclo compound-curing accelerator as a catalyst for the purpose of the addition of curability at low temperature and curability in a short time of period, etc.
In recent years, requirements for an improvement in characteristics have become more advanced in a variety of utilization fields for a cured article prepared from an epoxy resin. In the system in which an amine-curing agent is contained, there also increase fields in which characteristics cannot be satisfied by conventional products because of a problem such as storage stability for a long term caused by a great change of viscosity after the amine-curing agents are contained. Further, in a system which employs an acid anhydride- or phenol resin-curing agent, etc, there is a similar problem in curing accelerators mainly employed until now, which include tertiary amine-, quaternary ammonium-, tertiary phosphine-, quaternary phosphonium-, imidazole-, and azabicyclo compound-ones. For solving the problem, it has been proposed a modified epoxy adduct, a modified aliphatic amine, a modified polyamide amine, a mannich-modified amine, a thiourea-modified amine, a Schiff-modified amine (obtained by ketiminization), a Michael addition-modified amine, and a quaternary salt of imidazoles, etc.
There is an attempt that an N-substituted melamine is employed as an amine-curing agent for improving a storage stability after mixing and workability, etc. As such epoxy resin compositions, Japanese Patent Application Laid-open No. Sho 56-72019 discloses an epoxy resin composition in which an N-substituted melamine is contained. British Patent No. 1192790 discloses an epoxy resin composition in which an N-substituted melamine having at least two primary amino groups or guanamine, etc. is contained as an amine-curing agent.
There is an attempt that an N-substituted melamine is employed as a curing accelerator in an epoxy compound/phenol resin curing system for improving a stability such as a pot life after mixing and workability. As such epoxy resin compositions, Japanese Patent Application Laid-open No. Sho 60-202117 discloses an epoxy resin composition in which an N-substituted melamine and a novolak-type phenol resin are contained.
In the case of preparing an epoxy compound/acid anhydride-cured resin, if a tertiary amine-, a quaternary ammonium-, a quaternary phosphonium-, imidazole-, and azabicyclo compound-curing accelerators, etc. are not contained, reactivity of an epoxide with an acid anhydride is poor, productivity exceedingly lowers in a cured resin, and it becomes substantially difficult to prepare the cured resin. However, if such the curing accelerator is employed together as a catalyst, reaction usually proceeds even at a relatively low temperature, viscosity increases with a lapse of time and, further, gelling is caused, res
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Hidaka Motohiko
Koda Toshinari
Miyake Satoru
Osawa Ken'ichi
Aylward D.
Dawson Robert
Nissan Chemical Industries Ltd.
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