Biaxially oriented laminated film
AssigneeToray Industries, Inc.
InventorsIwao Okazaki, Koichi Abe, Shoji Nakajima
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Abstract
Disclosed is a biaxially oriented laminated film with excellent scratch resistance and friction property, as well as excellent dubbing resistance when used as a base film of magnetic recording media. The biaxially oriented laminated film comprises a first layer containing a first thermoplastic resin as a major constituent; and a second layer containing a second thermoplastic resin as a major constituent, which is formed on at least one surface of the first layer. The second layer contains inert particles with an average diameter of 0.1 to 10 times the thickness of the second layer, and the content of the inert particles in the second layer is 0.5-50% by weight. The thickness of the second layer is 0.005-3 .mu.m.
Claims18
A biaxially oriented laminated film comprising:
- a first layer containing a first thermoplastic resin as a major constituent;
- and
- a second layer containing a second thermoplastic resin comprising a crystalline polyester as a major constituent, which is formed on at least one surface of the first layer, the second layer containing inert particles with an average diameter of 0.5 to 5 times the thickness of the second layer, the content of the inert particles in the second layer being 0.5-50% by weight, the thickness of the second layer being 0.005-3 .mu.m, and said crystalline polyester having a crystallization index of attenuated total reflection Raman of its surface which is up to but not more than 20 cm.sup.-1.
The biaxially oriented laminated film of chain 1, wherein the average ratio of the shorter diameter of the particles to the longer diameter thereof is 1.0-1.3.
A biaxially oriented laminated film comprising:
- a first layer containing a first thermoplastic resin as a major constituent;
- and
- a second layer containing a second thermoplastic resin as a major constituent, which is formed on at least one surface of the first layer, the second layer containing inert particles with an average diameter of 0.1 to 10 times the thickness of the second layer, the content of theinert particles in the second layer being 0.5-50% by weight, the thickness of the second layer being 0.005-3 .mu.m, wherein the average height of protrusions on the surface of the second layer is not smaller than 1/3 of the average particle size of the inert particles in the second layer.
Dependencies are inferred from the claim text.