Dainichi-nippon Cables, Ltd.

Mitsubishi Rayon Company, Limited

Hideo Fujita

Hirotaka Itoh

Ikuo Igami

Masaru Uehara

Haruo Miyamoto

Hirosi Kato

Zyozi Kan

The herein-disclosed electrical insulating paper is well-suited to the insulation of extra-and ultra-high-voltage oil-filled electric power cable, and comprises at least one layer (A) which is a mixture of polypropylene fibers and kraft pulp and at least one layer (B) of accumulated polypropylene fibers laminated to the layer (A) by fiber-to-fiber bonding of the polypropylene fibers. The electrical insulating paper is prepared by superposing at least one layer of a mixed paper of polypropylene fibers and kraft pulp and at least one layer of polypropylene web, and heating the superposed layers at a temperature of 110.degree. to 180.degree. C to thermally laminate the layers each other.

Electrical insulating paper and method of making same

The invention provides a curable composition of polychloroprene, chlorinated polyethylene or polyepichlorohydrin containing at least one metal oxide having an oxidation state of 2 to 5 valences as a curing agent and at least one accelerator of the formula

Chlorinated elastomer compositions

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

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Takarazuka, Japan

Hideo Fujita