Biaxially oriented laminated polyester film and magnetic recordi

Details Biaxially oriented laminated polyester film and magnetic recordi Biaxially oriented laminated polyester film and magnetic recordi

1994-01-26

1996-09-17

Nakarani, D. S.

Stock material or miscellaneous articles

Structurally defined web or sheet

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

428219, 428220, 428323, 428480, 428694SG, 428694ST, 428910, 4289033, B32B 516

Patent

active

055566910

ABSTRACT:
A biaxially oriented laminated polyester film comprising a first thin polyester layer containing large-diameter inert particles and small-diameter inert particles; a second polyester layer containing large-diameter inert particles; and a third thin polyester layer containing large-diameter inert particles and small-diameter inert particles, the biaxially oriented laminated polyester film satisfying the following expression (1), ##EQU1## wherein: W.sub.1 is the content (wt. %) of the large-diameter inert particles in the first thin polyester layer, W.sub.2 is the content (wt. %) of the large-diameter inert particles in the second polyester layer, D.sub.13 is a total of the thickness (.mu.m) of the first thin polyester layer and the thickness (.mu.m) of the third thin polyester layer, and D.sub.2 is the thickness (.mu.m) of the second polyester layer. This film is useful as a base film for a magnetic medium.

REFERENCES:
patent: 4550049 (1985-10-01), Ono et al.
patent: 4818581 (1989-04-01), Katoh et al.
patent: 5069962 (1991-12-01), Okazaki et al.
patent: 5279881 (1994-01-01), Kotani
patent: 5374467 (1994-12-01), Sato
Database WPI Week 9406, Derwent Publications Ltd., London, GB; AN 94-045341 & JP-A-6 000 929 (TEIJIN LTD) 11 Jan. 1994.

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