Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...
Patent
1986-05-02
1987-09-15
Robinson, Ellis P.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including a second component containing structurally defined...
428329, 428330, 428331, 428480, 428694, 428900, 428910, 524605, 524425, 523220, G11B 5708
Patent
active
046939326
ABSTRACT:
An oriented polyester film comprising ethylene terephthalate as the major repeating units, which comprises 0.01 to 1.0% by weight of silica particles and/or titanium dioxide particles having each an average particle size of 0.01 to 0.5.mu. and 0.005 to 1.0% by weight of calcium carbonate having an average particle size of 0.01 to 0.5.mu., which provides an oriented polyester film for the base film of video tape which has a flatness on the surface and has excellent slipperiness, abrasion resistance and running characteristics as well as excellent magnetic transducer characteristics.
REFERENCES:
patent: 3790435 (1974-02-01), Tanba
patent: 3821156 (1974-06-01), Farrar
patent: 3980611 (1976-09-01), Anderson
patent: 4138386 (1979-02-01), Motegi
patent: 4198458 (1980-04-01), Mitsuishi
patent: 4242396 (1980-12-01), Wilson
patent: 4348446 (1982-09-01), Mitsuishi
patent: 4375494 (1983-03-01), Stokes
Hongo Tsuyoshi
Kobayashi Masahiro
Kuze Katsuaki
Maeda Kozo
Makimura Osamu
Robinson Ellis P.
Toyo Boseki Kabushiki Kaisha
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