Title:
THIN COEXTRUDED BIAXIAL-ORIENTED MULTILAYER FILM HAVING EXCELLENT ELASTIC MODULUS AND MANUFACTURE THEREOF
Document Type and Number:
Japanese Patent JPS62236736
Kind Code:
A
Abstract:
A coextruded, biaxially draw-oriented, multi-layer polyester film as a base film for magnetic tape is described, whose characteristics are that the total thickness of the multi-layer film is no more than 10 mu m, the surface roughness of the base film on the side intended for the application of an information-carrying coating has an Ra value (DIN 4768) of less than or equal to 0.010 mu m and the surface roughness of the opposite side of the base film which is not intended for application of an information-carrying coating, has an Ra value of greater than 0.010 mu m and that the film has an E-modulus in the machine direction of greater than or equal to 6500 N/mm2.
Inventors:
HERUMAN DARUMAN
HARUTOMUUTO HENZERU
BUERUNAA SHIEEFUAA
HARUTOMUUTO HENZERU
BUERUNAA SHIEEFUAA
Application Number:
JP7055787A
Publication Date:
October 16, 1987
Filing Date:
March 26, 1987
Export Citation:
Assignee:
HOECHST AG
International Classes:
B32B27/36; B29C55/12; B32B7/02; C08L67/00; G11B5/73; G11B5/733; G11B5/84; B29K67/00; B29L9/00; (IPC1-7): B29C55/12; B29K67/00; B29L9/00; B32B27/36; G11B5/704
Domestic Patent References:
| JPS6021250A | 1985-02-02 | |||
| JPS5936327A | 1984-02-28 |
Attorney, Agent or Firm:
Toshio Yano
Previous Patent: HIGH TRANSPARENCY FABRIC
Next Patent: METHOD OF PARTIALLY FORMING IRREGULAR SHAPE TO SURFACE OF SUBSTRATE
Next Patent: METHOD OF PARTIALLY FORMING IRREGULAR SHAPE TO SURFACE OF SUBSTRATE