Laminated polyester film and magnetic recording medium

Details Laminated polyester film and magnetic recording medium Laminated polyester film and magnetic recording medium

2006-05-23

2006-05-23

Ahmed, Sheeba (Department: 1773)

Stock material or miscellaneous articles

Structurally defined web or sheet

Physical dimension specified

C428S323000, C428S332000, C428S480000, C428S923000, C428S924000, C428S926000

Reexamination Certificate

active

07048994

ABSTRACT:
A laminated polyester film excellent in blocking resistance and processing suitability and exhibiting excellent electromagnetic transducing characteristics and excellent travel durability, when processed into a magnetic recording medium, and an electromagnetic recording medium using the laminated polyester film as a base film, are provided.This laminated polyester film comprises a polyester layer B containing a cyclic trimer in an amount of not more than 0.8 percent by weight, having a terminal carboxyl group concentration of not more than 35 eq/106g and containing inactive particles B having an average particle diameter of 50 to 100 nm, and a polyester layer A laminated to one side of the polyester layer B and not containing inactive particles or containing inactive particles A having a smaller average particle diameter than that of the inactive particles B.

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