Mitsubishi Chemical Corporation

Tokyo Institute of Technology

Central Glass Company, Limited

Yuta Hioki

Yoshikazu Kanamori

Koichi Mikami

Takayuki Aoshima

Kazunao Kusano

Ryo Yamashita

Shigeki Nitta

Kazuki Wakabayashi

Kohsuke Aikawa

Kaori Yano

Takayuki Yamanaka

Provided is a polycarbonate polyol used as a raw material of a polyurethane that has an excellent balance of flexibility, mechanical strength and solvent resistance. The polycarbonate polyol includes structural units derived from a polyhydric alcohol and has a hydroxyl value of 20 to 450 mg KOH/g. The polyhydric alcohol includes: a diol (A) containing not less than 70% by weight of a specific oxyalkylene glycol (A1); and a trihydric to hexahydric branched alcohol (B) having 3 to 12 carbon atoms. In the polycarbonate polyol, structural units derived from the branched alcohol (B) is contained in an amount of 0.005 to 5.0% by mole in the structural units derived from the polyhydric alcohol. A ratio of a structural unit (X1) represented by the following Formula (X1) in the structural units derived from the branched alcohol (B) is not higher than 50% by mole. 

Polycarbonate polyol and polyurethane

Provided is a polycarbonate polyol used as a raw material of a polyurethane that yields a polyurethane solution having good storage stability and exhibits excellent flexibility and solvent resistance. This polycarbonate polyol is a polycarbonate diol that includes structural units represented by the following Formulae (A) and (B), wherein, Rand Reach independently represent an alkyl group having 1 to 4 carbon atoms and, in this range of the number of carbon atoms, optionally have an oxygen atom, a sulfur atom, a nitrogen atom, a halogen atom, or a substituent containing these atoms; and Rrepresents a linear aliphatic hydrocarbon having 3 or 4 carbon atoms. This polycarbonate diol has a molecular weight of 500 to 5,000, and the value of the following Formula (I) is 0.3 to 20.0: (Content ratio of branched-chain moiety in polymer)/(Content ratio of carbonate group in polymer)&#xd7;100(%) (I). 

Polycarbonate diol, polycarbonate diol-containing composition, polycarbonate diol production method, and polyurethane

The present invention aims to provide a polyester polyol having favorable reactivity and a favorable color tone, which can be used for obtaining a polyurethane having an excellent balance of flexibility, mechanical strength, and chemical resistance, and a method for producing the polyester polyol. The object can be achieved with a polyester polyol in which an aliphatic diol contains as a structural unit 1,10-decanediol derived from a biomass resource, and in which the aldehyde body content in the polyester polyol is 0.01 to 0.5% by weight, and a method for producing the polyester polyol.

Polyester polyol, polyurethane resin, and production processes therefor

A method for producing an optically active fluorine-containing oxeten, the method being provided to include the steps of causing a fluorine-containing &#x3b1;-ketoester and an internal alkyne to react with each other in the presence of a transition metal complex that has an optically active ligand.

Method for producing optically active fluorine-containing oxeten

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Tokyo, Japan

Yuta Hioki