Mitsubishi Rayon Company, Limited

Mitsubishi Heavy Industries Limited

Dainichi-nippon Cables, Ltd.

Haruo Miyamoto

Ikuo Igami

Masaru Uehara

Hirotaka Itoh

Seiichi Shirakawa

Tokuhisa Miyamatsu

Hideo Fujita

Zyozi Kan

Hidetoshi Takamoku

The invention is a filter which comprises a porous support covered by carbonaceous fibers having a carbon content of at least 85%, wherein the individual fibers have a length in the range of from 0.1 to 5 mm and a diameter in the range of from 1 to 50 .mu. and acidic groups in a concentration of at least 0.01 meq/g on their surface. The filter is particularly useful for removing substances from water in a supply system for a steam generator.

Method of removing scale-forming substances from hot water system

Polyolefin fibers containing at least 70% by weight of polypropylene fibers having a denier of at least 0.5 and a birefringence of at least 2.5 .times. 10.sup.-.sup.2 are formed into a sheet. The sheet is then frictionally calendered in the dry state at a frictional ratio of at least 15% and at a temperature in the range from 90.degree.C to 160.degree.C whereby an insulating paper having excellent air-impermeability and oil-resistance is obtained.

Process for producing insulating paper where the paper is frictionally

Growing community of inventors

Nagoya, Japan

Haruo Miyamoto