Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Patent
1993-06-08
1995-12-19
Sweet, Mark
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
428323, 428910, 524583, 524265, 524269, 524430, 524431, 524433, 524435, 524436, 524437, 525 69, B32B 702
Patent
active
054767091
ABSTRACT:
The invention provides a polymeric insulating material having a high dielectric breakdown voltage. The material comprises polypropylene which has been obtained in a yield of at least 300,000 g/g-Ti based on titanium in a catalyst upon polymerization, contains ash in an amount not greater than 40 ppm by weight when analyzed by completely burning the polypropylene in air, said ash containing titanium in an amount not greater than 1 ppm by weight based on the weight of the polypropylene, and also contains chlorine in an amount not greater than 2 ppm by weight and boiling n-heptane soluble matter in an amount not smaller than 1 wt. % but not greater than 10 wt. %. According to the invention, it is possible to further improve the dielectric breakdown voltage by adding to the polypropylene an inorganic oxide or hydroxide free of particles of 10 .mu.m and greater in diameter and having an average particle size not greater than 1 .mu.m, an organopolysilane, a maleic-anhydride-grafted polypropylene, or a silane compound containing at least one organic polyether group.
REFERENCES:
patent: 3197454 (1965-07-01), Plaster
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patent: 4182852 (1980-01-01), Shiga et al.
patent: 5085916 (1992-02-01), Wilhelm et al.
patent: 5175051 (1992-12-01), Schloegl
Inoue Takeo
Ishii Yukio
Iwatani Tutomu
Kimura Shigeru
Sugimoto Ryuichi
Mitsui Toatsu Chemicals Inc.
Sweet Mark
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