Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1996-08-15
1998-06-16
Krass, Frederick
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
523414, 523420, 1621643, C08L 6300, C08L 6302
Patent
active
057671761
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an aqueous dispersion composition which provides excellent properties as a basic composition of a paper coating for improving printability, a paper strengthening agent, a cement compounding additive, a paint, an adhesive, etc. More particularly, it relates to an aqueous dispersion composition of an epoxy resin which, when cured, manifests the full characteristics possessed by an epoxy resin without causing reduction in water resistance and adhesion of a cured product, and also to a coating composition, a pulp composition and a mortar composition each using the aqueous dispersion composition.
BACKGROUND OF THE INVENTION
In recent years, an aqueous polymer dispersion of a thermoplastic resin obtained by emulsion polymerization of an acrylic system, an acrylate-styrene system, a vinyl acetate system, an ethylene-vinyl acetate system, etc. has been widely used in industry as a paint, an adhesive or a compounding additive for cement. Further, a polyamide urea-formaldehyde aqueous solution, a urea-formaldehyde resin aqueous solution, and melamine-formaldehyde resin aqueous solution have been used as a paper coating for improving printability, a paper strengthening agent, etc.
A film formed of these conventional aqueous polymer dispersions has insufficient adhesion to metal, wood, hardened cement, plastics, etc. and also insufficient resistance to water and heat resistance and therefore often suffers from separation or blistering in a wet state or in a high temperature. In order to improve such defects of an aqueous dispersion of a thermoplastic resin, it has been proposed to introduce a functional group into the skeleton of a polymer to form a crosslinked structure, but the effects are still insufficient. JP-A-61-87722 (the term "JP-A" as used herein means an "unexamined published Japanese patent application") describes a method for producing spherical particles of an epoxy resin by curing an emulsion of epoxy compound emulsified in the presence of a powdery emulsifier using an amine type curing agent. Since the curing agent for the production of epoxy resin spherical particles is water-soluble so that the resulting emulsion has a high viscosity and the epoxy resin spherical particles already have its structure crosslinked by the curing agent, they exhibits no adhesiveness at all. The mortar composition disclosed in JP-B-59-34670 (the term "JP-B" as used herein means an "examined published Japanese patent application") is hardly adhesive at room temperature because the epoxy resin dispersion used has a relatively high softening point. Further, an aqueous solution of a formaldehyde skeleton, though satisfactory in water resistance, has reduced adhesion in a dry state. Besides, it is essentially accompanied by generation of formalin, giving rise to an environmental problem.
An object of the present invention is to provide an aqueous dispersion composition which is free from the above-mentioned problems and which exhibits excellent handling properties with respect to adhesion and viscosity, and excellent stability after curing even under a high temperature and high humid condition or a low temperature and low humid condition.
Another object of the present invention is to provide a composition compounding the aqueous dispersion composition, which possesses excellent properties practical for a coating composition, and a pulp composition, or a mortar composition.
DISCLOSURE OF THE INVENTION
As a result of extensive study, it has been found that the above-mentioned problems associated with conventional aqueous polymer dispersions can be settled by combining an aqueous dispersion of an epoxy resin which is a thermosetting resin and a water-insoluble polyamine type curing agent.
The present invention relates to an aqueous dispersion composition comprising an epoxy resin aqueous dispersion consisting of 100 parts by weight of an epoxy resin, 0.1 to 5.0 parts by weight of a microcrystalline cellulose, and 0.1 to 10 parts by weight of a surface active
REFERENCES:
patent: 3870666 (1975-03-01), Becker
patent: 5430078 (1995-07-01), Hoppe-Hoeffler et al.
Nakanishi Masuhiko
Otuka Masahiko
Takagi Isao
Asahi Kasei Kogyo Kabushiki Kaisha
Krass Frederick
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