Takasago International Corporation

Keisuke Itakura

Misao Yagi

Takashi Imai

Hiroshi Sugiyama

Toshimitsu Hagiwara

Kenichi Yamamoto

Hitoshi Kondo

Akira Amano

Mamoru Yamada

Mika Tadokoro

Disclosed is a process for producing 5-cyclohexadecen-1-one continuously from 1,2-divinylcyclododecanol in a short time in an efficient manner without side reactions. In the process, 1,2-divinylcyclododecanol as a starting material is supplied from a raw material container,by a dosage pump,to a flash unit,which is set under a vacuum of 5 mm Hg or less by a vacuum pump,and is heated. 1,2-Divinylcyclododecanol which is flashed in the flash unit is supplied to a reactor,which is heated to 400 to 650&deg; C. and is set under a vacuum of 5 mm Hg or less whereby 1,2-divinylcyclododecanol is converted into 5-cyclohexadecen-1-one. The reaction product is discharged from the top of the reactor and is cooled to recover the objective 5-cyclohexadecen-1-one in the recovery container,. The reduction in the pressure of the apparatus is preferably performed by a vacuum pump,via a hydrochloric acid trap,comprising, for example, sodium methylate/methanol cooled to &minus;78 to &minus;100&deg; C.

Process and apparatus for production of 5-cyclohexadecen-1-one

A gradual releasing capsule having large mechanical strength, a large grain size and excellent gradual-releasability and its production method are disclosed. The capsule comprises a polymer core body containing a hydrophobic oil and a shell body formed of a cured body with which the surface of the core body is covered. The capsule is produced by dripping a core body-forming composition containing a hydrophobic oil and a reactive monomer and a curable polymer-containing solution from a multiple nozzle into a coagulating solution to form a primary capsule and then polymerizing the reactive monomer in the primary capsule.

Gradual-releasing capsule and method for manufacturing the same

An optically active compound represented by formula (I): ##STR1## wherein R.sup.1 represents an alkyl group having from 3 to 9 carbon atoms; R.sup.2 represents an alkyl group having from 3 to 7 carbon atoms; m and n each represent 1 or 2 provided that they do not simultaneously represent 1; and C.sup.*1 and C.sup.*2, both represent an optically active carbon atom, and a liquid crystal composition containing the same are disclosed. The compound exhibits chiral nematic and smectic phases and are excellent as a chiral dopant for ferroelectric liquid crystal compositions or nematic liquid crystal compositions.

Optically active compound and liquid crystal composition containing the

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Hiratsuka, Japan

Keisuke Itakura