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Home Manufacturing Materials Biaxially-oriented-laminated-film

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 Biaxially oriented laminated film

Details
Inventors: Okazaki, Iwao; Abe, Koichi; Nakajima, Shoji;
Assignee: Toray Industries, Inc. (JP)
Primary Examiner: Buffalow; Edith L.
Assistant Examiner:
Attorney, Agent or Firm: Miller; Austin R.

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.

DETAILED DESCRIPTION We claim: 1.
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.
2.
The biaxially oriented laminated film of claim 1, wherein the second layer is formed on only one surface of the first layer.
3.
The biaxially oriented laminated film of claim 1, wherein the second layer is formed on both surfaces of the first layer.
4.
The biaxially oriented laminated film of claim 2, further comprising a third layer containing a third thermoplastic resin as a major constituent and inert particles on the surface of the first layer, which surface is opposite to the surface on which the second layer is formed.
5.
The biaxially oriented laminated film of claim 1, wherein the first layer contains inert particles with an average diameter of 0.
007-2 .
mu.
m in the amount of 0.
001-0.
15% by weight with respect to the total weight of the first layer.
6.
The biaxially oriented laminated film of claim 1, 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.
7.
The biaxially oriented laminated film of claim 1, wherein the number of the protrusions on the surface of the second layer, of which height is smaller than 1/3 of the average diameter of the inert particles is not more than 40% of the total number of the protrusions


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