Kuraray Co., Ltd.

Jin Tokuyasu

Hideharu Iwasaki

Takashi Onishi

Takashi Hori

Naoki Fujiwara

Takeshi Kusudou

Atsuhiro Nakahara

Koichiro Isoue

Taketoshi Okuno

Takuo Tsuruta

Hiroyuki Ohgi

Toshihiro Omatsu

Takashi Sugioka

Hisamichi Yanai

Yoshihiro Tokuda

Masahiro Muranaka

Katsushi Nagareda

Kimiko Miyata

The present invention provides hydrogenated &#x3b2;-pinene-based polymers with excellent heat resistance and light resistance, low absorptivity and high transparency, as well as molded articles thereof. The polymers of the present invention contain 50% by mass or more of &#x3b2;-pinene units and are hydrogenated &#x3b2;-pinene-based polymers where the ratio of the proton integral value at 6 to 8 ppm to the total proton integral value in aH-NMR spectrum is 2.3&#xd7;10or less or the p-phenylene group content is 0.0055% by mass or less, and the ratio of the proton integral value at 4.5 to 6 ppm to the total proton integral value is 2.8&#xd7;10or less or the cyclohexene-1,4-diyl group content is 0.29% by mass or less. The molded articles of the present invention contain the above hydrogenated &#x3b2;-pinene-based polymers.

Hydrogenated &#x3b2;-pinene-based polymers and molded articles comprising the same

To provide a C4 fraction that contains significantly reduced amounts of butynes and methylallene and to provide a process for low-cost and effective production of ethers in which the C4 fraction is used as the starting material for a telomerization process. A mixture containing 25 to 80 mass % 1,3-butadiene, 13 to 68 mass % butenes and 2 to 15 mass % butanes with butynes and methylallene being contained in amounts of 50 ppm or less and 5 to 800 ppm, respectively.

Mixture containing 1,3-butadiene and process for producing the same

A bisphosphite represented by the general formula (I): General Formula (I) (in the formula, A represents an alkylene group which may have a substituent, a cycloalkylene group which may have a substituent, a phenylene group which may have a substituent, or a naphthylene group which may have a substituent; and Rrepresents a hydrogen atom or an alkyl group) and a method for producing an aldehyde including reacting a non-conjugated diene having a carbon-carbon double bond in a molecular end and having from 6 to 20 carbon atoms with a carbon monoxide and hydrogen in the presence of such a bisphosphite and a group 8 to 10 metal compound, are provided.

Method for producing aldehyde using bisphosphite and group 8-10 metal compound, and such bisphosphite

A method for producing ethers comprises the following steps: initiating telomerization process of a conjugated diene compound with an hydroxyl compound represented by the following formula (I):ROH&#x2003;&#x2003;(I)in the presence of a palladium compound, a tertiary isocyanide represented by the following formula (II):RNC&#x2003;&#x2003;(II),and a base; and adding halfway through the telomerization process a tertiary phosphine represented by the following formula (III):PRRR&#x2003;&#x2003;(III)(the respective symbols are defined in the description).

Method for producing ethers

The present invention provides polyvinyl alcohol based (PVA) whose solubility in water varies with a small temperature change to a sufficiently great degree. In manufacturing a polyvinyl alcohol based polymer by: progressing a transesterification reaction of a polyvinyl ester based polymer with alcohol in a liquid reaction mixture including the polyvinyl ester based polymer, the alcohol, and a basic compound; precipitating the polyvinyl ester based polymer, at least a part of which has been transesterified with the alcohol, out of the liquid reaction mixture; and further progressing the transesterification reaction in the liquid reaction mixture including the polyvinyl ester based polymer that has precipitated, the liquid reaction mixture has a temperature of 75&#xb0; C. to 150&#xb0; C. when the polyvinyl ester based polymer, at least a part of which has been transesterified, starts precipitating.

Polyvinyl alcohol based polymer and method of manufacturing the same

An aminoalcohol is synthesized by reacting a cyclic hemiacetal expressed by Formula 1

Method for manufacturing aminoalcohol

Hydroformylation process

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Kurashiki, Japan

Jin Tokuyasu