Biaxially oriented laminated polyester film

Details Biaxially oriented laminated polyester film Biaxially oriented laminated polyester film

1995-01-09

1997-08-12

Thibodeau, Paul J.

Stock material or miscellaneous articles

Structurally defined web or sheet

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

428215, 428323, 428336, 428480, 428694SG, 428910, B32B 2736, B32B 2718, B32B 516

Patent

active

056563566

ABSTRACT:
A biaxially oriented laminated polyester film comprises a polyester substrate layer (A) and a polyester surface layer (B) containing inert particles wherein the polyester surface layer (B) has a thickness of 0.2 to 3 .mu.m with the thickness of the polyester surface layer (B) varying along the film width direction so that the surface layer (B) is thicker at the edges of the film and thinner at the center of the film. The thickness of the surface layer (B) also satisfies specified relationships based on surface layer thickness, birefringence, and orientation angle values at two different points along the film width direction in order to obtain a film whose surface layer (B) has a uniform surface roughness in the film width direction wherein the polyester surface layer (B) has a surface roughness Ra of 3 to 40 nm and a surface roughness Ra fluctuation ratio of 5% or less when measured along a distance of 500 mm in the film width direction. The laminated film can be slit and easily wound into pancake rolls.

REFERENCES:
patent: 4590119 (1986-05-01), Kawakami et al.
patent: 5364698 (1994-11-01), Kotani et al.
patent: 5366783 (1994-11-01), Utsumi et al.
patent: 5374467 (1994-12-01), Sato
patent: 5419942 (1995-05-01), Masuda et al.
patent: 5431976 (1995-07-01), Etchu et al.
Database WPI, Section Ch, Week 8525, Derwent Publications, Ltd., London, UK Abstract of Japanese Laid-Open Patent Publication No. 60-080125 (May 8, 1985).

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