Daicel Chemical Industries, Ltd.

Nobuyuki Watanabe

Yoshihiro Ohtsuka

Akihiro Yabui

Kazunori Nakao

Motoshi Ishikura

To prepare a polyester polyol in which a lactone is ring-opening addition polymerized with the compound represented by formula (I).  (wherein each of Aand Arepresents an alkylene group having not less than 2 carbon atoms, Arepresents an alkylene group, X represents a cationic component, and each of n and m represents an integer of not less than 1.) The polyester polyol has a high hydrophilic group and high solubility in a solvent (particularly, a low-boiling organic solvent used in the production of a polyurethane) and can design an aqueous polyurethane desirably and produce the aqueous polyurethane.

Polyester polyol and polyurethane resin

An epoxidized granular thermoplastic polymer which comprises a shell-like surface layer insoluble in toluene at 25&#xb0; C. is formed on the polymer, and a process for the production of the epoxidized granular thermoplastic polymer characterized in that the process comprises: the first step of epoxidizing a granular thermoplastic polymer in a water medium in the presence of an epoxidizing agent or the epoxidizing agent and a solvent for accelerating an epoxidation reaction and a phosphoric acid series compound; the second step of the washing with water, or the neutralization and washing with water of the epoxidized granular thermoplastic polymer; and the third step, if necessary, of removing the solvent for accelerating epoxidation reaction which may be used in the first step, as well as a process for the production of an epoxidized thermoplastic polymer, characterized in that under the condition in which thermoplastic polymer (A) in the solid-state is dispersed or suspended in water (B), the thermoplastic polymer (A) is epoxidized by a peroxide (C) with the dispersed or suspended state maintained.

Epoxidized thermoplastic polymers and processes for their production

A polyimide foam is prepared by heating a mixture comprising an alkyl ester of 4,4'-oxydiphthalic acid and a diamine at a temperature of 60.degree. to 350.degree. C. This foam is elastic and flame-retardant and has an excellent resistance to acid and alkali.

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Otake, Japan

Nobuyuki Watanabe