Polyester film and process for producing the same

Details Polyester film and process for producing the same Polyester film and process for producing the same

1993-05-05

1997-05-06

Thibodeau, Paul J.

Stock material or miscellaneous articles

Structurally defined web or sheet

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

428215, 428480, 428694TR, 428694BR, 428694SG, 428910, B32B 2736, B32B 516, B32B 2706

Patent

active

056269420

ABSTRACT:
A polyester film has a surface layer whose major component is polyester A wherein protrusions formed on the film surface originating from the crystallization of polyester A. The number of protrusions formed on the surface of the film is not less than 5.times.10.sup.3 /mm.sup.2, and the ratio N.sub.R of the number of protrusions to the number of particles contained in a surface layer forming the surface of the film is not less than 5. Since most of or the whole of the protrusions are formed by the crystallization of polyester A as opposed to particles, generation of voids can be prevented fine and uniform protrusions having excellent chipping resistance and scratch resistance can be formed.

REFERENCES:
patent: 3951905 (1976-04-01), Sano et al.
patent: 3967025 (1976-06-01), Tanabe et al.
patent: 4670319 (1987-06-01), Katoh et al.
patent: 4677188 (1987-06-01), Utsumi et al.
patent: 4868006 (1989-09-01), Yorkgitis et al.
patent: 4990400 (1991-02-01), Endo et al.
patent: 5057364 (1991-10-01), Saito et al.
patent: 5069962 (1991-12-01), Okazaki et al.
patent: 5085915 (1992-02-01), Taga et al.
patent: 5169583 (1992-12-01), Moriguchi et al.
Derwent Abstract No. 86-187027 of JP61120724.

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