Asahi Kasei Kabushiki Kaisha

Asahi Kasei Kogyo Kabushiki Kaisha

Tamotsu Kodama

Nobuhisa Miyake

Haruyuki Minoura

Setsuo Yamamatsu

Satoshi Furubeppu

Masanori Ikeda

Masahiro Tojo

Tsutomu Katsumata

Takaharu Akedo

Naoko Ishihara

Yoshiyuki Tsunematsu

Takeshi Mori

Hiroshi Miya

Shuji Kawabe

Disclosed is an oxytetramethylene glycol copolymer, which is obtained by copolymerizing tetrahydrofuran and neopentyl glycol and which has a specific number average molecular weight Mn, a specific molecular weight distribution Mw/Mn, a specific neopentyl glycol copolymerization whole ratio Nand a specific neopentyl glycol copolymerization partial ratio N, and a method for producing the same. Also disclosed is a method for purifying an oxytetramethylene glycol copolymer, which comprises adding a fresh tetrahydrofuran to a reaction mixture comprising an oxytetramethylene glycol copolymer and an unreacted diol, wherein the amount of added tetrahydrofuran is not less than the weight of the unreacted diol contained in the reaction mixture, and distilling off the unreacted diol together with the added tetrahydrofuran.

Oxytetramethylene glycol copolymer and method for producing the same

An oxytetramethylene glycol copolymer obtained by copolymerizing tetrahydrofuran and neopentyl glycol which has a specific number average molecular weight Mn, a specific molecular weight distribution Mw/Mn, a specific neopentyl glycol copolymerization whole ratio Nand a specific neopentyl glycol copolymerization partial ratio N; a method for producing the same; and a method for purifying an oxytetramethylene glycol copolymer using fresh tetrahydrofuran.

Oxytetramethylene glycol copolymer and process for producing the same

Disclosed is a high heat resistance and low viscosity polyoxytetramethylene glycol (PTMG) having the following characteristics (1) to (4): (1) a number average molecular weight of from 500 to 3000; (2) a molecular weight distribution of 1.8 or less in terms of the Mw/Mn ratio; (3) a content of high molecular weight PTMG molecules of from 2 to 5% by weight, wherein the high molecular weight PTMG molecules are PTMG molecules having molecular weights which are at least six times as large as the number average molecular weight of all PTMG molecules; and (4) a heteropolyacid content of from 10 to 900 ppb by weight.

Polyoxytetramethylene glycol and process for producing the same

Hexaazaisowurtzitane derivative and method for producing the same

A method for acylating a hexakis (arylmethyl) hexaazaisowurtzitane (WB,) by reductively removing the arylmethyl groups in the presence of an acylating agent, characterized by contacting a WB,(a) with a heterogeneous system reduction catalyst (b) in the presence of an acylating agent (c) and a reducing agent (d) in a solvent (e) for the WB,(a) to reductively remove the arylmethyl groups from the WB,(a) and acylate the same, and by preventing the WB,(a) and the catalyst (b) from being contacted with each other when at least either of the acylating agent (c) and the reducing agent (d) is not present. In this method, the decomposition of the WB,skeleton, which readily occurs in the beginning of the acylation of the WB,as a starting material, can be highly effectively inhibited. This method can hence stably produce a tetraacylhexaazaisowurtzitane derivative in a high yield and is industrially advantageous.

Method for acylating hexakis (arylmethyl) hexaazaisowurtzitane

Process for the preparation of hexanitrohexaazaisowurtzitanes

Process for the preparation of acylated hexaazaisowurtzitane derivatives

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Delft, Netherlands

Tamotsu Kodama