Biaxially oriented polyester film

Details Biaxially oriented polyester film Biaxially oriented polyester film

1987-08-26

1989-04-04

Buffalow, Edith

Stock material or miscellaneous articles

Structurally defined web or sheet

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

428480, 428694, 428900, 428402, B32B 2700

Patent

active

048185817

ABSTRACT:
A biaxially oriented polyester film formed from an intimate mixture comprising (1) an aromatic polyester, and (2) 0.01 to 4% by weight, based on the aromatic polyester, of spherical fine particles of silica having (a) an average particle diameter of 0.05 to 4 .mu.m, (b) a particle diameter ratio, defined by the ratio of maximum diameter of minimum diameter, of from 1.0 to 1.2, and (c) a relative standard deviation (.sigma.) of particle size, of up to 0.5. A biaxially oriented polyester film formed from an intimate mixture comprising (1) an aromatic polyester, (2) 0.005 to 3% by weight, based on the aromatic polyester, of spherical fine particles of silica having the same properties as the above-mentioned (a), (b) and (c), and (3) 0.005 to 3% by weight, based on the aromatic polyester, of inert fine particles having an average particle diameter of 0.01 to 3 .mu.m and not exceeding the average particle diameter of the spherical fine particles of silica. The biaxially oriented films are useful for a magnetic recording medium.

REFERENCES:
patent: 4595715 (1986-06-01), Kuze
patent: 4677188 (1987-06-01), Utsumi et al.
patent: 4680217 (1987-07-01), Kanesaki et al.
patent: 4720411 (1988-01-01), Shimozawa et al.
patent: 4720412 (1988-01-01), Katoh et al.
patent: 4725472 (1988-02-01), Okabe et al.
patent: 4726998 (1988-02-01), Ikenaga et al.

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