Biaxially oriented polyester film

Details Biaxially oriented polyester film Biaxially oriented polyester film

1988-10-05

1990-08-28

Lesmes, George F.

Stock material or miscellaneous articles

Structurally defined web or sheet

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

428143, 428148, 428149, 428323, 428480, 428694, B32G 2736, B32G 300, B32G 2704

Patent

active

049524496

ABSTRACT:
A biaxially oriented polyester film suited as a substrate for magnetic recording media. The film comprises a polyester and inert particles and has at least one surface with protrusions formed by the existence of the inert particles. The surface has a parameter of surface topography .sqroot.(.beta./.sigma.) of 0.1 to 0.7. The average distance between adjacent protrusions is not more than 20 um and the coefficient of friction of the surface and the parameter of surface topography satisfies the following equations (1) and (2): ##EQU1## wherein y is the coefficient of friction, .beta. is mean flatness of protrusions and .sigma. is standard deviation of height distribution of protrusions.

REFERENCES:
patent: 4539260 (1985-09-01), Abe et al.
patent: 4578729 (1986-03-01), Suzuki et al.
patent: 4615939 (1986-10-01), Corsi et al.
patent: 4670319 (1987-06-01), Katoh et al.
patent: 4680217 (1987-07-01), Kanesaki et al.
patent: 4720412 (1988-01-01), Katoh et al.
patent: 4767657 (1988-08-01), Sakamoto et al.
patent: 4778708 (1988-10-01), Nishino et al.
patent: 4798759 (1989-01-01), Dallman et al.

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