Diafoil Hoechst Company, Limited

Yuko Watanuki

Shigeo Utsumi

Masashi Inagaki

Disclosed herein is a polyethylene naphthalate multilayered film for a high density magnetic recording medium comprising:

Polyethylene naphthalate multilayered film for high density magnetic

A polyester film prepared through a lamination of at least two layers by coextrusion, wherein one of exposed surfaces (surface A) has a center line average roughness of from 0.002 to 0.015 .mu.m, a polyester layer forming the other of the exposed surfaces (surface B) has a lower melting point than a polyester forming the surface A, and the surface B has a degree of planar orientation of not larger than 0.100, which can be used as a base film for magnetic recording tape having no back coating.

Laminated polyester film for magnetic tape having specific surface

A multilayered polyester film for high-density magnetic discs, comprising a layer of polyester (A) and a layer of polyester (B) having a thickness of not more than 3 .mu.m, being laminated on at least one side of the layer of polyester (A) and having specific surface characteristics.

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Tokyo, Japan

Yuko Watanuki