Laminated polyester film for magnetic tape having specific surfa

Details Laminated polyester film for magnetic tape having specific surfa Laminated polyester film for magnetic tape having specific surfa

1992-03-05

1994-11-22

Thibodeau, Paul J.

Stock material or miscellaneous articles

Structurally defined web or sheet

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

428143, 428323, 428480, 428694SG, B32B 516, D06N 704

Patent

active

053667832

ABSTRACT:
A polyester film prepared through a lamination of at least two layers by coextrusion, wherein one of exposed surfaces (surface A) has a center line average roughness of from 0.002 to 0.015 .mu.m, a polyester layer forming the other of the exposed surfaces (surface B) has a lower melting point than a polyester forming the surface A, and the surface B has a degree of planar orientation of not larger than 0.100, which can be used as a base film for magnetic recording tape having no back coating.

REFERENCES:
patent: 4687700 (1987-08-01), Hensel et al.
patent: 4720412 (1988-01-01), Katoh et al.
patent: 4789759 (1989-01-01), Dallman et al.
patent: 4804736 (1989-02-01), Utsumi
patent: 5047278 (1991-09-01), Ono et al.
patent: 5069962 (1991-12-01), Okazaki et al.

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