Takeda Chemical Industries, Inc.

Ichiro Minato

Koichi Shibata

Kimiya Fujinami

Itsuo Furuoya

Fumiaki Hirata

Tatsuya Nakashima

Kohji Nasu

Takashi Tsukamoto

Toyoji Hatta

Isatsugu Onishi

An optical urethane resin is obtained by reacting a polyiso(thio)cyanate compound having a hydrolyzable chlorine content of not greater than 300 ppm with an active hydrogen compound. There is provided an optical urethane resin with a minimum of coloration, a high total light transmittance and free of optical distortion.

Optical urethane resin

A polyisocyanate having an isocyanurate ring which is obtained by reacting a diisocyanate compound selected from the group consisting of alkylene, cycloalkylene and aralkylene diisocyanates with a monoalcohol of 10 to 50 carbon atoms in the presence of an isocyanuration catalyst, and removing of the unreacted diisocyanate compound from the reaction mixture, can be used in combination with various polyols, in the main, for the preparation of coatings, adhesives, architectural materials, molding materials, etc.

Polyisocyanates, their production and uses

A chipping resistant polyurethane coating composition which comprises: (a) a polyisocyanate blocked with an oxime or a lactam or a polyurethane prepolymer having terminal isocyanate groups blocked with an oxime or a lactam; (b) a polyaminepolyetherpolyester which is a condensate of a polyaminepolyether and an organic carboxylic acid, the polyaminepolyether being an adduct of an oxirane compound to a polyamine compound, a polyamidepolyamineopolyether which is an adduct of an oxirane compound to a polyamidepolyamine, the polyamidepolyamine being a condensate of a polyamine and an organic carboxylic acid; or a mixture of the polyaminepoly-etherpolyester and the polyamidepolyaminepolyether. The composition in which an aromatic polyisocyanate or its prepolymer blocked with an oxime is curable at temperatures of about 90.degree.-100.degree. C.

Coating compositions

A urethane resin composition which comprises (i) a polyisocyanate component having 20/80 to 80/20 of a weight ratio on a solid basis of an .alpha., .alpha., .alpha.', .alpha.'-tetramethyl-xylylene diisocyanate derivative to a hexamethylene diisocyanate derivative and (ii) an acrylic polyol. The urethane resin composition can provide coating films with excellent drying property, mechanical properties, weathering resistance and chemical resistance, and are advantageously used, for example, as a paint for automobile repairing uses.

Urethane resin compositions

Disclosure is a novel hardening agent for epoxy resins which has quick cold hardening ability and high safety for human bodies. This hardening agent has the general formula: ##STR1## Epoxy resins hardened with this hardening agent have excellent mechanical properties at high temperatures.

Epoxy resin hardening agents

The present invention provides novel triisocyanate compounds of the formula: ##STR1## wherein ##STR2## stands for ##STR3## the production thereof and the use thereof for polyurethane resins, especially, for solvent-free or high solids polyurethane coatings.

Triisocyanates and their production and use

Disclosed is a novel polyglycidyl compound useful as polyfunctional epoxy resins excellent in adhesion, heat resistance and strength. This novel polyglycidyl compound has the general formula: ##STR1## (wherein ##STR2## A method for producing this polyglycidyl compound is also disclosed.

Polyglycidyl compounds

Disclosed is a novel triamine derivative, particularly a ketimine or aldimine derivative derived from a triamine and a ketone or an aldehyde, which has the following general formula: ##STR1## [wherein ##STR2## X is hydrogen or a hydrocarbon radical of 1 to 8 carbon atoms; Y is a hydrocarbon radical of 1 to 8 carbon atoms; X and Y, together with their neighboring carbon atom, may form a 5- to 7-membered aliphatic hydrocarbon ring; and n is an integer of 1, 2 or 3]. This novel triamine derivation is useful as a curing agent for epoxy resins or polyurethane resins.

Aldimines and ketimines of 1,3,5-(aminomethyl)benzene or cyclohexane and

The present invention provides novel triisocyanate compounds of the formula: ##STR1## the production thereof and the use thereof for polyurethane resins, especially, for solvent-free or high solids polyurethane coatings.

Triisocyanates

Aromatic nitriles can be produced in high yields by ammoxidation of an alkyl-substituted aromatic compound in the presence of a catalyst containing oxides of (1) vanadium, (2) antimony and (3) at least one of uranium and chromium, even when concentration of the starting aromatic compound in the starting gas is high or mixing ratio of ammonia to the starting aromatic compound is reduced to the neighborhood of the stoichiometric equivalent.

Growing community of inventors

Kobe, Japan

Ichiro Minato