The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 05, 2001
Filed:
Dec. 28, 1998
Teijin Limited, Osaka, JP;
Abstract
The present invention relates to a low electrostatic composite polyester film comprising a base film C, a coating layer A formed on one side of the base film C, and a coating layer B formed on the other side of the base film C, where (1) the coating layer A is formed of a water-soluble or water-dispersible resin coating inert particles and has a center line average roughness (Ra−A) of the surface of 0.1 to 2 nm; (2) the coating layer B includes 1 to 40 wt % of inert particles and a composition containing a water-soluble or water-dispersible resin, the resin-containing composition containing 5 to 85 wt % of a silicone-modified polyester resin or 1 to 30 wt % of silicone or wax based on the layer B; and (3) the base film C is formed of an aromatic polyester. According to the present invention, it is possible to provide a composite polyester film useful as a base film for a magnetic recording medium that has low electrostatic properties and is excellent in not only blocking resistance and abrasion resistance but also electromagnetic conversion characteristics and adhesion to a back coat.