Kuraray Co., Ltd.

Taisho Pharmaceutical Co., Ltd.

Michihiro Ishiguro

Koji Hirai

Takashi Nishida

Yoshiji Fujita

Kimio Nakayama

Noriaki Yoshimura

Tatuya Oshita

Manzo Shiono

Hisao Yoneda

Takehiro Amano

Masao Ishii

Tetsuya Ashida

Takayuki Okamura

Kensei Yoshikawa

Shunro Taniguchi

Yutaka Ohuchi

Yoshifumi Murata

Shinichi Yokota

Tatsuhiko Sano

Shizuo Iwata

Shinya Katoh

Shigeaki Suzuki

Sigeru Torii

Takashi Onishi

Yukiatsu Komiya

Katsura Maeda

Kenji Uneyama

Takashi Ohnishi

Setuo Yamashita

Hiroyuki Ono

Disclosed are thermoplastic polyurethanes obtainable by reacting (a) a polyester-polyol that satisfies all the following requirements (1) to (4):

Thermoplastic polyurethanes and molded articles comprising them

Disclosed are thermoplastic polyurethanes obtainable by reacting (a) a polyester-polyol that satisfies all the following requirements (1) to (4): (1) its ester group content (number of ester bonds/number of all carbon atoms) is from 0.08 to 0.17; (2) it has hydroxyl groups of from 2.01 to 2.08 per one molecule; (3) it has a number average molecular height of from 1000 to 7000; and (4) it has a crystallization enthalpy (.DELTA.H) of 70 J/g or less, (b) an organic diisocyanate and (c) a chain extender at a ratio that satisfies the following numerical formula (i):

Thermoplastic polyurethane composition

A polyurethane made of polyester diol units, organic diisocyanate units and units from a chain extender, wherein the polyester diol units contain dicarboxylic acid units and diol units, wherein at least 30 mole % of the dicarboxylic acid units are units derived from 3,8-dimethyldecanedioic acid, 3,7-dimethyldecanedioic acid or a mixture thereof, and wherein the polyester diol units have a number-average molecular weight in a range from 500 to 6000 is provided along with the polyester diol for preparing the polyurethane, polyurethane fibers prepared from the polyurethane, a molded article prepared from the polyurethane and processes for producing the polyurethane, polyester diol, dimethyldecanedioic acids and dimethyldecanedials used to prepare the dimethyldecanedioic acids; where the polyurethane and fibers produced therefrom are superior in various properties such as hydrolytic resistance, heat resistance, resistance to hot water, cold resistance, fungal resistance and mechanical performances e.g., strength at break and elongation at break, as well as injection moldability and the fibers are dyeable under high-temperature and high-pressure conditions and are superior, after dyeing, in tensile strength and elongation, elastic recovery, fungal resistance, resistance to chlorine and color fastness.

Polyurethane and molded article comprising the same

Elastic polyurethane fiber

Process for producing polyurethane

A process for producing a novel polyester polyurethane having excellent hydrolysis resistance and excellent flexibility at low temperature, which is obtained from a polyisocyanate and a polyester polyol which is obtained by reaction a dicarboxylic acid with a mixture of 1,9-nonanediol and a polyol represented by the formula ##STR1## wherein R.sup.1 denotes methyl group or ethyl group, R.sup.2 denotes hydrogen atom, methyl group, ethyl group, hydroxymethyl group or hydroxyethyl group, and n is an integer of 1 to 5, said polyester polyol having an average molecular weight of 500 to 30,000.

Process for producing polyester polyurethane

A process for producing 1-(p-prenylphenyl)ethanol, which comprises reacting p-chloroprenylbenzene with magnesium at a temperature between 100.degree. C. and 150.degree. C. to form a Grignard reagent, and then reacting it with acetaldehyde.

Process for producing 1-(p-prenylphenyl)ethanol

A process for producing an .alpha.-arylalkanoic acid ester represented by the general formula ##STR1## wherein Ar represents an aryl group which may optionally be substituted, and R.sup.1 and R.sup.2, independently from each other, represent a lower alkyl group, which comprises reacting a Grignard reagent prepared from an aryl halide of the general formula

Process for producing .alpha.-arylalkanoic acid ester

Novel cyclohexanone derivatives of general formula: ##STR1## (wherein R.sup.1 is a hydrocarbon group of 1 to 15 carbon atoms) and new cyclohexanone derivatives of general formula: ##STR2## (wherein R.sup.1 and R.sup.2 each is a hydrocarbon group of 1 to 15 carbon atoms) are produced by an electrooxidative coupling of 1,3-cyclohexanedione with a vinyl ether of general formula:

1,3-Cyclohexanedione derivatives

Ionones and irones are produced by thermal rearrangement of novel propargylic alcohols, as follows: ##STR1## wherein R.sup.1 is a lower alkyl group, R.sup.2 is hydrogen or methyl and the dotted lines in the product formula reflect the existence of a double bond at either one or the other of the positions indicated.

Production of ionones and irones by thermal rearrangement of propargylic

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Kurashiki, Japan

Michihiro Ishiguro