Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Patent
1985-04-16
1987-08-18
Thibodeau, Paul J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
15624411, 15624424, 428323, 428336, 428480, 428694, 428900, 428910, B32B 3130, B32B 3120, B32B 2736
Patent
active
046876995
ABSTRACT:
An abrasion-resistant, multilayer biaxially oriented carrier film for magnetic information media produced by coextrusion is described, said film being composed of a base layer (A) comprising a thermoplastic polymer matrix of essentially linear aromatic polyester, containing finely distributed solid particles to improve its surface roughness which determines the slip properties of the film, and of at least one cover layer (B) applied to one of the two surfaces of base layer (A). The characterizing features of the carrier film described consist in the fact that base layer (A) contains the solid particles in an an amount from 0.001 wt. % to 10 wt. %, based on the weight of the polymer forming base layer (A), whereby the average particle size of the solid particles lies in the range from 0.001 to 20 microns, by the fact that cover layer (B) comprises a thermoplastic polymer matrix of essentially linear aromatic copolyester, in which finely distributed solid particles are embedded in a quantity between 0 and 10 wt. %, based on the weight of the polymer forming cover layer (B), whereby the solid particles have an average particle diameter of less than 0.3 micron, and by the fact that the layer thickness of cover layer (B) is a maximum of 40% of the layer thickness of base layer (A).
REFERENCES:
patent: 4198458 (1980-04-01), Mitsuishi et al.
patent: 4375494 (1983-03-01), Stokes
patent: 4550049 (1985-10-01), Ono et al.
patent: 4568599 (1986-02-01), Ono et al.
Dallmann Hermann
Hensel Hartmut
Hoechst Aktiengesellschaft
Lydon James C.
Thibodeau Paul J.
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