Process for producing insulating paper where the paper is fricti

Details Process for producing insulating paper where the paper is fricti Process for producing insulating paper where the paper is fricti

1972-11-08

1976-05-18

Bashore, S. Leon

Paper making and fiber liberation

Processes and products

Utilizing non-aqueous suspending medium

100 38, 162138, 162146, 162157R, 162168R, 162206, 264121, D21H 520, D21H 526

Patent

active

039575730

ABSTRACT:
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.

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patent: 3669829 (1972-06-01), Caldo et al.
patent: 3674621 (1972-07-01), Miyamoto et al.
patent: 3814622 (1974-06-01), Issliki et al.

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