Filled polyester films
AssigneeMylar Specialty Films U.S. Limited Partnership
InventorLucien Schosseler
Life of this patent
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Abstract
Provided herein is a biaxially oriented polyester film comprising first inorganic particles P1 and second inorganic particles P2. The film has a total thickness of from 1.5 to 8.0 μm. The first inorganic particles P1 have an average particle size of from 0.1 to 0.5 μm and are present in the film in a concentration of from 100 to 3000 ppm, and the second inorganic particles P2 have an average particle size of from 1.50 to 3.50 μm and are present in the film in a concentration of from 100 to 2000 ppm. The film exhibits a haze of no more than 5.0%.
Claims24
1-36. (canceled)
A biaxially oriented polyester film comprising first inorganic particles P1 and second inorganic particles P2, wherein:
- (i) said film has a total thickness of from 1.5 to 8.0 μm;
- (ii) said first inorganic particles P1 have an average particle size of from 0.1 to 0.5 μm;
- (iii) said first inorganic particles P1 are present in the film in a concentration of from 100 to 3000 ppm;
- (iv) said second inorganic particles P2 have an average particle size of from 1.50 to 3.50 μm;
- (v) said second inorganic particles P2 are present in the film in a concentration of from 100 to 2000 ppm;
- and
- (vi) said film exhibits a haze of no more than 5.0%,
- wherein said first inorganic particles P1 are amorphous silica particles, and wherein said second inorganic particles P2 are selected from spherical methyl silsesquioxane particles;
- wherein the term “average particle size” refers to the volume distributed median particle diameter, which is the equivalent spherical diameter corresponding to 50% of the volume of all the particles, read on the cumulative distribution curve relating volume % to the diameter of the particles, as measured by laser light diffraction.
Dependencies are inferred from the claim text.