Laminate polyester films

Details Laminate polyester films Laminate polyester films

1975-07-10

1980-04-15

Ansher, Harold

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

274 11E, 274 43, 428323, 428339, 428409, 428480, 428900, 428910, G11B 2506, B32B 2736

Patent

active

041984587

ABSTRACT:
A stretch-oriented laminate polyester film consisting of two or three layers of polyester films; both polyester film A and polyester film B which form the external layers of the laminate film are composed of a polyester having an intrinsic viscosity of 0.35 to 1.0, wherein the intrinsic viscosity of a polyester forming the polyester film B is 0.02 to 0.5 greater than that of a polyester forming the polyester film A. The laminate film is curled in the widthwise direction with the polyester film B located inwardly of the curl. This film can be used for various applications, especially as a measuring tape, an adhesive tape and a base of a photographic film. As a preferred embodiment, a laminate polyester magnetic tape with reduced drop-out occurrence, comprising the stretch-oriented laminate film and a magnetic layer coated on one external layer thereof, the polyester film A forming one external layer of the laminate film having incorporated therein a finely-divided inert compound so that its coefficient of static friction becomes not more than 0.80, and the polyester film B forming the other external layer of the laminate film being a film having a coefficient of static friction greater than that of the polyester film A by at least 0.05 and a smoother surface, with the magnetic layer being coated on the surface of the polyester film B is disclosed.

REFERENCES:
patent: 2804401 (1957-08-01), Cousino
patent: 3416991 (1968-12-01), Yoshimura
patent: 3515626 (1970-06-01), Duffield
patent: 3900653 (1975-08-01), Riboulet et al.
patent: 3958064 (1976-05-01), Brekkan et al.
patent: 3967025 (1976-06-01), Tanabe et al.
patent: 3983285 (1976-09-01), Riboulet et al.

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