Daicel Corporation

Daicel Chemical Industries, Ltd.

Tomohiro Hashizume

Hiroyuki Matsumura

Mitsuru Ohno

Tohru Shibata

Hiroki Taniguchi

Hiroshi Koyama

Akihiro Higuchi

Masaaki Kusumoto

Tomoichi Watabe

Toshikazu Nakamura

Shu Shimamoto

Ikuo Takahashi

Shizuka Ukita

Masato Shigematsu

Yugo Takano

Kazuhiro Nakanishi

This cellulose acetate has a total degree of acetyl substitution of 1.75 or more and 2.55 or less, and a degree of acetyl substitution at 2-position or a degree of acetyl substitution at 3-position is 0.7 or less. This cellulose acetate composition includes the cellulose acetate and an additive. The additive is one or more selected from the group consisting of (a) substances of which a pH of a 1 wt. % aqueous solution at 20° C. is 8 or more, (b) substances that dissolve in water at 20° C. in an amount of 2 wt. % or more, and (c) substances that exhibit biodegradability in seawater.

Cellulose acetate and cellulose acetate composition

A cellulose ester, wherein, in a structural formula of the following general formula (I), a degree of substitution where X is an acyl group is from 2.91 to 3.0; the acyl group includes benzoyl group (A) optionally having a substituent, and benzoyl group (B) optionally having a substituent different from that of benzoyl group (A); and when the degree of substitution is 3.0, a degree of substitution of benzoyl group (A) is from 1.5 to 2.9, and a degree of substitution of benzoyl group (B) is from 0.1 to 1.5, wherein all or some of X represents an acyl group; when some of X represents an acyl group, the remainder represents a group selected from a hydrogen atom and an alkyl group; and n represents an integer of from 20 to 20,000.

Cellulose ester and molded article thereof

This cellulose acetate has a total degree of acetyl substitution of 1.75 or more and 2.55 or less, and a degree of acetyl substitution at 2-position or a degree of acetyl substitution at 3-position is 0.7 or less. This cellulose acetate composition includes the cellulose acetate and an additive. The additive is one or more selected from the group consisting of (a) substances of which a pH of a 1 wt. % aqueous solution at 20&#xb0; C. is 8 or more, (b) substances that dissolve in water at 20&#xb0; C. in an amount of 2 wt. % or more, and (c) substances that exhibit biodegradability in seawater.

Provided is a semipermeable membrane having a high chlorine resistance. The semipermeable membrane is formed of a cellulose ester, the cellulose ester having an optionally substituted benzoyl group.

Semipermeable membrane

Provided is a novel cellulose derivative having excellent water resistance. This is a cellulose acylate oxoalkanoate which is a cellulose derivative corresponding to cellulose, except with substituents replacing part or all of hydrogen atoms in the hydroxy groups of the cellulose. The substituents includes a group represented by General Formula (1) and a group represented by General Formula (2). The cellulose acylate oxoalkanoate has a degree x of substitution with the group represented by General Formula (1), a degree y of substitution with the group represented by General Formula (2), and a degree z of unsubstitution, where x, y, and z meet conditions specified by Expressions (A), (B), and (C):0.1&#x2264;&#x2264;2.99&#x2003;&#x2003;(A)0.01&#x2264;&#x2264;2.90&#x2003;&#x2003;(B)=3&#x2212;&#x2003;&#x2003;(C) 

Cellulose acylate-oxoalkanoate

Provided is a method for efficiently producing high-purity hydrogenated biphenol based on a simple method that can be industrially utilized using easily-available biphenol as a starting material. The method for producing hydrogenated biphenol according to the present invention is a method for producing hydrogenated biphenol by hydrogenating biphenol represented by the following formula (1): to obtain hydrogenated biphenol represented by the following formula (2): the method including: a reaction step of hydrogenating the biphenol represented by formula (1); and a purification step of washing or crystallizing a reaction product obtained from the reaction step using an aromatic hydrocarbon.

Method for producing hydrogenated biphenol

Bis(cis-3,3,5-trimethylcyclohexyl) phthalate, process for producing the same, and thermoplastic resin composition

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Himeji, Japan

Tomohiro Hashizume