Kawamura Sangyo Co., Ltd.

Toray Industries, Inc.

Hitachi Engineering Services Co., Ltd.

Miyoshi Yokura

Kenji Hatada

Kenichirou Tada

Satoru Nakanishi

Tetsuo Inoue

Hiroaki Kobayashi

Shinichiro Miyaji

Hisashi Katsumata

Masashi Kato

Taku Yamaga

Shun Ito

Kenichi Watanabe

Makoto Koyama

H Kobayashi

A low-temperature plasma treatment is applied to a surface of an aramid paper so as to allow the surface to have a compositional atomic ratio X (O/C) of the number of oxygen atoms (O) to the number of carbon atoms (C) ranging from 110% to 220% of a theoretical atomic ratio. The treatment is performed at an intensity ranging from 120 to 1500 W&#xb7;min/mwith a low-temperature plasma treatment apparatus of internal electrode system. The aramid paper is superposed with a nonhydrolyzable resin film and the resulting article is pressurized to give an aramid-resin film laminate. The laminate is inexpensive, has both superior electrical properties and high mechanical strength, excels in elasticity, and is useful as an insulation material.

Method of manufacturing adhesive-free laminate of aramid paper and polyphenylene sulfide film, and insulation material and insulation structure for rotating electric machinery

Disclosed is a biaxially oriented film laminated board having a thickness of 0.5 mm or more, wherein biaxially oriented films composed of a resin composition having a melting point of 240&#xb0; C. or higher are laminated at a multi-layer condition without interposing an adhesive therebetween. This biaxially oriented film laminated board is characterized in that the minimum value among the elongation at break in the longitudinal direction and that in the transverse direction is 25% or more when the board is punched into a rectangular form. Also disclosed are various electrical insulation boards and machine parts each using the laminated board. A laminated board having properties of a biaxially oriented film including thermal resistance, electrical insulation, mechanical strength, flexibility and workability can be obtained.

Biaxially oriented film laminated board, electrical insulation board and machine part

A laminate comprising aramid paper containing aramid fiber and aramid pulp and polyester film, the aramid paper and polyester film having been subjected to plasma surface treatment before laminating, wherein the aramid paper and polyester film are continuously bonded to each other. The disclosure is concerned with a process for manufacturing the laminate and an apparatus for manufacturing the laminate.

Adhesive-free aramid-polyester laminate, method of manufacturing the same and apparatus for manufacturing the same

An aramid paper made from aramid fibrid and short fiber and formed into a paper shape has two sides and a surface and includes a thermal bonding face located in at least one of the sides of the aramid paper, the thermal bonding face having such a property as to be directly thermally bondable with another sheet of aramid paper of the same material or a polyester film at a thermal bonding temperature ranging from 90&#xb0; C. to 200&#xb0; C. when a plasma treatment is applied to the surface of the aramid paper. The plasma treatment has an intensity ranging from 30 W&#xb7;min/mto 1500 W&#xb7;min/m, and the thermal bonding face has a composition ratio (O/C) of the number of oxygen atoms (O) to the number of carbon atoms (C) ranging between 150% and 230% of a theoretical value of an atom number ratio.

Method for manufacturing an aramid paper with an applied plasma treatment

A fabric having an excellent color developing property and having recesses of a depth of 0.05 to 1 .mu.m and a width of 0.05 to 1 .mu.m formed at least on the surface of the fibers existing in the surface portion of the fabric, the number of recesses being 1 to 10 per .mu.m on the periphery of the fibers existing in the surface portion of the fabric in a portion of the fiber cross-section at which the recesses are formed at least the recesses formed on the surface of the fibers existing in the surface portion of the fabric being coated with a coating material of an organic polymer having a refractive index at least 0.03 lower than the refractive index of the fibers. The fabric has a high depth of color and an excellent abrasion resistance.

Fabrics having an excellent color developing property and a process for

Polyvinyl chloride tube having a crosslinked thin layer of about 0.1 to about 1 micron in thickness at least on its inner surface, thereby substantially reducing the migration and volatilization of plasticizers and other additives from the polymeric materials into the fluid in said tube. The tube of this invention is especially useful for medical use.

Growing community of inventors

Otsu, Japan

Miyoshi Yokura