Back to results
US 6,036,905 AGranted
Method for preparing polyester films
AssigneeKolon Industries, Inc.
InventorsSang Bong Park, Kyung Heum Han, Gi Tak Gam
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeKolon Industries, Inc.
InventorsSang Bong Park, Kyung Heum Han, Gi Tak Gam
Estimating the term…
A method for preparing polyester films, which comprises addition of partially esterified trimellitate at any stage of the polymerization of polyester through direct esterification or ester interchange, the partially esterified trimellitates resulting from salt formation of partial esterified trimellitic acids which are prepared by partial esterification of aromatic tricarboxylic acids selected from trimellitic acid and trimellitic anhydride with alcohols selected from alkyl alcohols and alkylene alcohols. The polyester film prepared the composition has little voids by virtue of good affinity of the particles originating from the partially esterified trimellitates with polyester and thereby not easily broken when forming films. In addition, it is easy to control particle content and size. Further, fine protrusions can be repeatitively formed in the final films, with ease, giving high abrasion resistance and slip property to the film. Besides, the polyester films can be formed in high casting speed attributable to superior electrostatic adhesion.
A method for preparing polyester films, wherein bis (beta-hydroxyethyl) terephthalate and/or low molecular weight condensates with a polymerization degree of 2-10 are obtained through direct esterification of terephthalic acid with ethylene glycol, or through ester interchange reaction of dimethyl terephthalate with ethylene glycol, and subjected to polycondensation to give polyester which is then molded into films, comprising addition of partially esterified trimellitate at any stage of the preparation of polyester.
Dependencies are inferred from the claim text.