Sekisui Chemical Co., Ltd.

Keio University

Nippon Shinyaku Company, Ltd.

Yasuhiro Koike

Koike, Yasuhiro

Hirotsugu Yoshida

Tazuru Okamoto

Ryosuke Nakao

Hiroka Inabe

Yuki Masabe

Yoshiaki Yoshikuni

Shoichi Chokai

Takayuki Ozaki

Jun Segawa

Ryuichi Matsuo

Haruo Tanaka

Shigeru Ogasawara

Hisashi Eguchi

Masato Aoyama

The invention provides an extrusion material supply device suitable for use in melt extrusion molding, and a method for manufacturing an optical transmission body, in which a deterioration of an optical signal transmission loss is extremely small, and productivity intrinsic to an extrusion molding method is provided in combination. An extrusion material supply deviceincludes: a vertical hopper, which has a cooling unitand a heat melting unitcontinuous with a lower portion thereof, and houses a material rod R; cooling meansfor cooling the cooling unit; an electric heaterthat heats the heat melting unit; and gas pressurizing meansfor sequentially supplying molten plastics M to a metal die by a gas pressure. The heat melting unitis formed into a cylinder shape in which an inner diameter is larger than an inner diameter of the cooling unitarranged above, and enables the molten plastics M to spread in the heat melting unit. A portion between an outer circumference of the material rod R and an outer circumference of the molten plastics M is defined as an annular gas pressurizing surface

Extrusion material supply device and optical transmission body manufacturing method using the same

The present invention provides a process for producing an oriented thermoplastic polyester resin sheet which is excellent in tensile strength, tencile modulas and heat resistance, and a light laminate-molded body using the same, which has a low linear expansion coefficient and is excellent in impact resistance, durability, easiness of handling, productivity, and others. A process for producing an oriented thermoplastic polyester resin sheet, which includes: pultrusion-drawing a thermoplastic polyester resin sheet in an amorphous state at a temperature from the glass transition temperature of the thermoplastic polyester resin &#x2212;20&#xb0; C. to the glass transition temperature of the thermoplastic polyester resin +20&#xb0; C.; and then drawing the resultant uniaxially at a temperature higher than the temperature for the pultrusion-drawing. A laminate-molded body, wherein a thermoplastic resin layer is laminated on each of the surfaces of the resultant oriented thermoplastic polyester resin sheet.

Process for producing oriented thermoplastic polyester resin sheet, and laminate-molded body

[Object] The present invention has the object of providing an optical fiber enabling high-speed communication, that exhibits superior transparency and excellent flexibility, and that includes trichloroethyl methacrylate as a main component of the core portion monomer. [Means for Solving Problem] An optical fiber configured from a core portion and a cladding portion disposed on an outer periphery of the core portion, wherein the core portion is formed by a main constituent component of a polymer of monomers that include at least 70 wt % of trichloroethyl methacrylate (TCEMA), the cladding portion is formed by a main constituent component of a polymer of monomers which include at least 20 wt % of methyl methacrylate (MMA).

Optical fiber and method for manufacturing same

A GI type optical fiber of the present invention is a GI type optical fiber having a core component and a cladding component disposed around the outer periphery of the core component, the core component includes a polymer containing at least 55 wt % chlorostyrene monomer and a dopant, and the cladding component includes a polymer of a monomer containing at least 35 wt % methyl methacrylate. It is an object of the present invention to provide a GI type optical fiber in which chlorostyrene is used as the predominant component of the monomer that constitutes the core component, and therefore has excellent transparency and good flexibility, and allows high-speed communication.

GI type optical fiber and method for manufacturing same

Compounds of formula (I) ##STR1## or a pharmaceutically acceptable salt thereof, wherein R.sup.1 is hydrogen, halogen or alkyl and R.sup.2 is hydrogen or alkyl are useful to reduce serum lipids in animals, including humans.

Benzoic acid derivatives

Growing community of inventors

Kyoto, Japan

Hirotsugu Yoshida