Biaxially oriented polyester film

Details Biaxially oriented polyester film Biaxially oriented polyester film

1990-12-07

1991-10-29

Cashion, Jr., Merrell C.

Stock material or miscellaneous articles

Composite

Of polyester

428688, 428698, 428900, B32B 2736

Patent

active

050615718

ABSTRACT:
A biaxially oriented polyester film containing 0.01 to 4 wt %, based on the polyester film, of inorganic particles, the volumetric shape parameter being 0.02 to 0.2, the weight-average particle size being 0.05 to 3 .mu.m, and the ratio (Dw/Dn) of the weight-average particle size (Dw) and the number-average particle size (Dn) being not more than 1.1 is disclosed. The film of the present invention has a uniform surface and shows excellent running property and wear resistance so that it is useful as a base film for a magnetic tape, for example. Thus, the film of the present invention has a high industrial value.

REFERENCES:
patent: 4767657 (1988-08-01), Sakamoto et al.
patent: 4801640 (1989-01-01), Dallmann et al.
patent: 5006589 (1991-04-01), Sakamoto et al.

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