Laminated film

Details Laminated film Laminated film

1993-04-16

1994-12-20

Loney, Donald J.

Stock material or miscellaneous articles

Structurally defined web or sheet

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

428156, 428172, 428148, 428212, 428213, 428215, 428219, 428220, 428323, 428340, 428402, 428409, 428480, 4289033, 428910, 2641761, 26417717, 2641772, 26421112, 2642884, B32B 516, B32B 320

Patent

active

053744675

ABSTRACT:
A laminated polyester film having a first polyester layer B and a second polyester layer A which is laminated on at least one surface of the polyester layer B and contains 0.05 to 10% by weight of particles having an average particle size of 0.005 to 1.0 .mu.m based on the weight of the polyester layer A, in which a ratio of a thickness of the polyester layer A to a particle size of particles contained in the polyester layer B is from 0.5 to 10, the numbers of protrusions on a surface of the polyester layer A which give second order interference fringes, third order interference fringes and fourth or higher order interference fringes in a multiple beam interference method using light having a wavelength of 540 nm are from 5 to 60/mm.sup.2 , not larger than 20/mm.sup.2 and not larger than 3/mm.sup.2, respectively, which film has good runnability and abrasion resistance and provides a magnetic recording medium with good electromagnetic conversion characteristics.

REFERENCES:
patent: 4568616 (1986-02-01), Seifried et al.
patent: 4615939 (1986-10-01), Corsi et al.
Japanese Patent Abstract JP 84-052161 (Dec. 1984).
Patent Abstract, Derwent Publications Ltd., No. JP 3 292 141 (Dec. 1991).
Patent Abstract, Derwent Publications Ltd., No. 89-293 002 (Aug. 1989).
Patent Abstract, Derwent Publications Ltd., No. 89-273 932 (Aug. 1989).

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