Takeda Chemical Industries, Inc.

Takurou Sakamoto

Takeo Nakayama

Yoshio Kamatani

Fumihiro Doura

Kimiya Fujinami

Saburo Inoue

A one-can resin composition which contains:

One-can resin compositions

A resin composition, which comprises (a) a copolymer containing isocyanate group prepared by subjecting a compound represented by the general formula ##STR1## wherein R.sub.1 stands for hydrogen or methyl group and an ethylenic unsaturated monomer to copolymerization, and (b) a copolymer containing amino group prepared by subjecting a compound represented by the general formula ##STR2## wherein R.sub.2 stands for hydrogen or methyl group and an ethylenic unsaturated monomer to copolymerization, has a pot life of such an extent as for permitting them to be used as spray-coating, and the resulting film is excellent in flexibility, chemical resistance, water resistance and corrosion resistance, and, besides, rapid in curability, thus being useful as cold-drying coatings on metals, plastics, woods, inorganic materials, etc. and also as adhesives, etc. The resin composition is very good in compatibility, thus being useful in such a field as required high gloss and beautiful finish. Further, the amino group containing copolymer is of relatively high molecular weight, thus being of less toxicity, and, besides, substantially odorless, and, therefore, it causes no injurious problems to health and safety.

Resin compositions

A curable resin composition which comprises (1) a copolymer composed of an aminoalkyl acrylate and/or aminoalkyl methacrylate and an ethylenically unsaturated monomer being formulated with (2) a compound having at least two acryloyl groups in the molecule. The composition can be cured at low temperatures in the range of ordinary temperature to 120.degree. C., and therefore advantageously used for the formation of coating films in the application fields, such as plastics, wood and concrete, where heat treatment cannot be performed. Also, the composition which exhibits excellent adherence toward various kinds of substrates can be used as adhesives and different kinds of primers, as well. Furthermore, the composition can provide coating films that excel in terms of water resistance, weathering resistance and solvent resistance, and therefore be utilized for overpaints, etc.

Curable resin compositions

Polyurethane resin curable at low temperature and in a short time is prepared by contacting a compound having 1-oxa-3,5-diazine-2,4,6-trione ring as well as isocyanate groups, e.g. a reaction product of an aliphatic, alicyclic or aralkyl polyisocyanate, e.g. hexamethylene diisocyanate and carbon dioxide and a compound having active hydrogen, e.g. polyester polyol, with tert-amine, e.g. trimethylamine present in gaseous phase, at a temperature of 0.degree.-100.degree. C. The ratio of the sum of the numbers of the trione ring and the isocyanate group to the number of the active hydrogen in the compound having the same is 0.1 to 10.

Method for producing polyurethane resins

Polyurethane compound is cured in a short time at about room temperature by contacting a polyurethane compound having 1-oxa-3,5-diazine-2,4,6-trione ring but no isocyanate group with an amine present in gaseous phase in the presence or absence of such a compound having active hydrogen as polyester polyol. A one-package type urethane resin composition curable at low temperature is made available.

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Kawanishi, Japan

Takurou Sakamoto