Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Patent
1988-10-17
1989-06-20
Herbert, Thomas J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
264171, 2641772, 428220, 428323, 428480, B32B 702, B32B 2708, B32B 2736
Patent
active
048408360
ABSTRACT:
A thick composite polyester film of between 40 and 300 microns in thickness being crystalline or semicrystalline comprising drawn unfilled layer (A) of thickness e, covered on at least one surface thereof with a thin drawn filled layer (B) of thickness e.sub.2, having an overall roughness greater than 0.3 microns and being filled with inert particles wherein the volume median diameter of the filler being at least equal to the thickness of layer (B); the thickness ratio of layers (A) and (B) denoted by e.sub.1 /e.sub.2 is lower than 5% and the percentage of scattered light transmitted from the composite film is lower than 7.
REFERENCES:
patent: 3515626 (1970-06-01), Duffield
patent: 3983285 (1976-09-01), Riboulet et al.
patent: 4375494 (1983-03-01), Stokes
patent: 4399179 (1983-08-01), Minami et al.
patent: 4533509 (1985-08-01), Gust et al.
English translation of Japanese Patent No. 53-125479, Nov. 1, 1978, Kawakami et al.(1), pp. 1-5.
English translation of Japanese Patent 54-15979, Feb. 6, 1979, pp. 1-19, Kawakami et al.(2).
Herbert Thomas J.
Rhone-Poulenc Films
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