Sumitomo Chemical Company, Limited

Takeda Chemical Industries, Inc.

Yasuaki Abe

Shozo Horikiri

Kozo Tsuji

Masato Ueda

Makoto Kitano

Taiiti Okada

Mitsuhisa Yamano

Isao Yahagi

Takenori Osada

Akira Morii

Fumi Yamaguchi

Mikio Hayashi

Chitoshi Hatanaka

Akio Fukui

Kousaku Asagi

Eiichi Ichiki

Kazutoshi Fujimura

Manabu Sasaki

Yukio Fujii

Method for producing peptides and their salts which have an agonist activity of luteinizing hormone releasing hormones secreted from the hypothalamus

A polysilane is disclosed whose main chain skeleton has a repeating unit represented by the general formula (1): ##STR1## wherein R.sub.1 represents a substituted or unsubstituted alkyl cycloalkyl, aryl or aralkyl group; X is a atom having an unpaired electron or a group containing an atom having an unpaired electron and represents an oxygen atom, sulfer atom or a nitrogen atom-containing group represented by the general formula (2): ##STR2## wherein R.sub.2 represents a substituted or unsubstituted alkyl, cycloalkyl, aryl or aralkyl group; Ar.sub.1 represents a substituted or unsubstituted arylene group; and Ar.sub.2 represents a substituted or unsubstituted aryl group, a group having an aromatic amine skeleton or a group ethenylene skeleton; a process for producing the polysilane; and a dihalosilane which is the starting material therefor. The polysilane compound has an excellent moldability as a high polymeric material and a higher hole drift mobility as a hole transporting material.

Polysilane, its production process and starting materials therefor

A method for producing a compound of the formula: ##STR1## [wherein R.sup.1 and R.sup.2 each stand for a lower alkyl group; n denotes an integer of 0 to 21; X stands for hydrogen atom or an optionally protected hydroxyl group; and Y stands for an optionally protected hydroxyl group], which comprises reducing an ester compound of the formula: ##STR2## [wherein R.sup.1, R.sup.2, n, X and Y are of the same meaning as defined above, and R.sup.3 stands for a lower alkyl group ] with a mixture of sodium borohydride and aluminum chloride. This method give the desired compound in a high yield, and is advantageous from the industrial point of view.

Reduction of carboxylic esters

The present invention relates to a process for the continuous production of prepreg sheets unidirectionally arranged in parallel which involves contacting a plurality of fiber bundles arranged unidirectionally in parallel with each other with a solvent and continuously taking up the individual fiber bundle units under tension over curved surfaces of spreader bodies, such as cylinders while in a wet state, thereby spreading out said fiber bundles over the curved surfaces by means of said tension and subsequently drying the thus-spread out fibers. The invention also contemplates impregnating the dried fiber bundles with a specified quantity of molten resin to prepare the final prepreg resin-containing sheets. According to applicants' method, the fiber bundles are spread with a solvent prior to being impregnated with a resin and this method greatly decreases the frictional resistance between the fiber bundles and the curved surfaces making it possible for the fiber bundles to be spread out by only using a slight tension.

Process for continuous production of prepreg sheets

A composite material, which comprises aluminum or an aluminum-base alloy as the matrix and an alumina fiber or an alumina-silica fiber having substantially no .alpha.-alumina reflection by X-ray diffraction as a reinforcement, said composite material having high tensile strength and high tensile modulus even at a high temperature.

Composite material comprising reinforced aluminum or aluminum-base alloy

A process for producing alumina fiber or alumina-silica fiber having excellent mechanical strength and heat resistance, comprising (i) spinning a solution of at least one polyaluminoxane or of a mixture of at least one polyaluminoxane and one or more kinds of silicon-containing compounds in an organic solvent, (ii) hydrolyzing the resulting precursor fiber, and then (iii) calcining the hydrolyzed fiber, said polyaluminoxane being one or more kinds of polymers or copolymers which mainly consist of the structural units of the formula: ##STR1## wherein the pendant groups Y are one or more kinds of groups selected from the group consisting of an alkyl, an alkoxy, an acyloxy, phenyl and phenoxy, and which may be partially a halogen or hydroxy.

Process for producing alumina fiber or alumina-silica fiber

Growing community of inventors

Takarazuka, Japan

Yasuaki Abe