Skc, Inc.

Seung-Soo Woo

Kwang-Hyung Lee

Young-Jin Lee

Nam-Il Kim

Joon-Hee Han

Je-Wung Lee

A biaxially oriented polyester film consisting essentially of a polyester resin, polytetrafluoroethylene resin particles having an average particle diameter of 3 to 8 .mu.m in an amount ranging from 0.3 to 0.6% by weight based on the weight of the polyester resin, and a polyacrylate dispersant in the amount 0.05 to 5 wt % based on the weight of polytetrafluoroethylene particles. The film possesses excellent surface properties, e.g., abrasion resistance, scratch resistance, transparency, void resistance, surface smoothness, slurry stability, running property and dielectric strength.

Biaxially oriented polyester film

A biaxially extended polyester film comprising light calcium carbonate particles, spherical silica particles and .gamma.- or .delta.-alumina particles or a mixture thereof treated with a silane coupling agent prepared by the inventive process possesses excellent surface and physical properties.

Process for the preparation of biaxially extended polyester film

A biaxially oriented polyester film which contains 0.01 to 5 wt % of zinc oxide having an average particle diameter ranging from 0.01 to 5 .mu.m has improved transparency, UV light shielding ability and surface properties, and it is especially useful as wrapping materials for food, labels, window coating films, photoresists and the like. The zinc oxide may be optionally pretreated with a silane coupling agent of formula (I):

The present invention relates to a biaxially oriented polyester film comprising the inorganic particulate slip agent of aluminum hydroxide or .THETA.-alumina having an average diameter ranging from 0.1005 to 3 .mu.m and Mohs hardness of 6 or more, in an amount ranging from 0.01 to 4 wt % based on the weight of the polyester, which has improved surface properties, abrasion resistance and scratch resistance.

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Kwacheon-si, South Korea

Seung-Soo Woo