Ube Industries, Inc.

Masahiko Watanabe

Masanori Watanabe

Takafumi Hirakawa

Atsushi Morikami

Yohsuke Ueno

Koji Abe

Toshikazu Hamamoto

Yukio Inaba

Masahiro Naiki

Yasuhiro Kawachi

Ryoichi Takasawa

Atsuo Hitaka

Noriyuki Ohira

Kosuke Fujiyama

Yukihiro Nishida

Takahumi Hirakawa

The phosphorus-containing polycarbonate polyol disclosed herein has a structural unit (I) represented by a formula: &#x2014;OCOO&#x2014; and a structural unit (II) represented by a residue A, wherein A denotes a n-valent residue in which n of alcoholic hydroxyl groups are removed from a phosphorus compound having at least n of alcoholic hydroxyl groups, in which n is an integer of 2 or larger, and wherein a terminal group of the polyol is a alcoholic hydroxyl group. The novel phosphorus-containing polycarbonate polyol, as a reactive flame-retardant agent, can provide flame-retardant properties easily to polyurethane or the like.

Phosphorus-containing polycarbonate polyol, method for production thereof, and phosphorus-containing polycarbonate polyurethane

Disclosed is a polythiourethane having a high refractive index and low dispersion which is obtained through a reaction between a polythiol component containing one or more polythiocarbonate polythiol (preferably one having a &#x2014;(CO&#x2014;S&#x2014;R&#x2014;S)&#x2014; structure (wherein R represents a divalent hydrocarbon group) and a number average molecular weight of 200-2,500) and a polyisocyanate component containing a polyisocyanate and/or a polyisothiocyanate. This polythiourethane is useful for plastic lenses, prisms, optical fibers, substrates for information recording, colored filters, infrared absorbing filters and the like.

Polythiourethane

Disclosed is a polythiocarbonate polythiol including repeating units represented by the chemical formula (I): in which formula (I), R represents a divalent hydrocarbon group, which hydrocarbon group may have at least one substituent which does not take part in a reaction with the polyisocyante component and the carbon chain in the hydrocarbon group may include at least one member selected from hetero atoms and an &#x2014;OCO&#x2014; group, and the polythiocarbonate polythiol has a number average molecular weight of 200 to 2500.

Polythiocarbonate polythiol

An electrolyte solution for a lithium secondary battery comprises a nonaqueous solvent and a fluorine-containing electrolyte capable of dissociating into lithium ions, wherein the content of HF in the electrolyte solution is less than 30 ppm.

Electrolyte solution for lithium secondary battery

A process for preparing a high purity H.sub.2 O.sub.2 aqueous solution, which comprises the steps of: (a) feeding a crude H.sub.2 O.sub.2 aqueous solution containing H.sub.2 O.sub.2, organic carbon impurities and inorganic impurities into a distillation column having an inner wall at least the surface of which is made of a fluorine resin and internals and packings at least the surface of which are made of a fluorine resin being provided internally of the distillation column, from a bottom portion of the distillation column; (b) subjecting the crude hydrogen peroxide aqueous solution to distillation under reduced pressure and under heating the bottom portion; (c) taking out a distillate containing an extremely low concentration of H.sub.2 O.sub.2 from a top portion of the distillation column without using the distillate for reflux in a distillation operation, and feeding ultra pure water in an amount satisfying (an amount of ultra pure water fed into column top)/((an amount of column top distillate)--(an amount of ultra pure water fed into column top)) being 0.1 to 20 into the top portion of the distillation column; and (d) taking out a H.sub.2 O.sub.2 aqueous solution having a high purity from a middle portion of the distillation column, simultaneously or successively.

Process for preparing high purity hydrogen peroxide aqueous solution

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Ube, Japan

Masahiko Watanabe