Polyester film with projections and depressions on the surface

Details Polyester film with projections and depressions on the surface Polyester film with projections and depressions on the surface

1981-10-14

1984-07-24

Lesmes, George F.

Stock material or miscellaneous articles

Structurally defined web or sheet

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

428156, 428323, 428331, 428480, 428900, 428910, G11B 570

Patent

active

044617976

ABSTRACT:
A polyester film characterized by having many uneven units on its surface, each of said uneven units being composed of a fine projection and a depression existing therearound, and a process for producing aforesaid polyester film, which comprises pre-heating an unstretched polyester film containing internal particles attributed to an inert additive having an average particle diameter of 0.05 to 5 .mu.m and/or a catalyst residue to a temperature of 80.degree. to 120.degree. C.; stretching the film in a first axial direction to 2.6 to 3.5 times at a temperature of 110.degree. to 145.degree. C.; thereafter, stretching the film in a second axial direction at right angles to the first axial direction to 3.0 to 4.0 times at a temperature of 100.degree. to 150.degree. C.; and then heat-setting the stretched film at a temperature of 160.degree. to 240.degree. C.

REFERENCES:
patent: 4304807 (1981-12-01), Kawakami et al.
patent: 4348446 (1982-09-01), Mitsuishi et al.

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