Biaxially drawn, filled polyester film substrates

Details Biaxially drawn, filled polyester film substrates Biaxially drawn, filled polyester film substrates

1984-07-13

1987-03-31

Ziegler, Jacob

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

361312, 427127, 427128, 428172, 428323, 428325, 428328, 428339, 428480, 428694, 428900, 428910, 524413, 524539, D06N 704

Patent

active

046542493

ABSTRACT:
Biaxially drawn, filled polyester film substrates, well adapted for the manufacture of magnetic recording tapes, are comprised of a biaxially stretched thermoplastic film matrix including a particulate filler material distributed therethrough, said filler material comprising (a) from about 0.01% to 1% by weight thereof of kaolinite particles having a mean particle size no greater than about 1 micron, and (b) from about 0.01% to 1% by weight thereof of titanium oxide particles also having a mean particle size no greater than about 1 micron.

REFERENCES:
patent: 3221226 (1965-11-01), Kennedy et al.
patent: 4348446 (1982-09-01), Mitsuishi et al.
Chemical Abstract, vol. 89, 130959t assigned to Teijin.
Chemical Abstract, vol. 90, 24298n assigned to Toray Industries.

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