Patent ID: 6713155
Filing Date: 2004-03-30
Classification: B32B,G11B,Y10S,Y10T

Abstract:
A laminated thermoplastic resin base film for a magnetic recording medium, comprising:a first thermoplastic resin layer having a surface roughness WRa of an exposed surface of 0.1 to 4 nm; and a second thermoplastic resin layer which contains 0.001 to 5 wt % of inert fine particles having an average particle diameter of primary particles of 0.1 to 2.0 &mgr;m and 0.001 to 10 wt % of at least one ester wax selected from the group consisting of sorbitan tristearate, pentaerythritol tribehenate, glycerin tripalmitate and polyoxyethylene distearate, and which has a water contact angle of the exposed surface of 70 to 90Â°, the first thermosplastic resin layer and the second thermoplastic resin layer being laminated together.