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US 6,855,400 B1Granted
Low pigment content polyester film and process for making the same
AssigneeDuPont Teijin Films U.S. Limited Partnership
InventorsChristine Andreis, Gusty Feyder
Life of this patent
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Abstract
The invention relates to a film comprising: (i) at least one polyester layer containing more than 10 wt % of a pigment, and (ii) at least one polyester layer substantially devoid of pigment, where the ratio of the respective thickness of the layer(s) devoid of pigment to the pigmented layer(s) is at least 1. The film shows good mechanical properties together with high opacity properties.
Claims26
A film comprising:
- (i) at least one crystalline polyester layer containing more than 5 wt % of a pigment wherein the pigment is selected from the group and consists essentially of white pigment, voided pigment, TiO2, SiO2, CaCO3, Al2O3, BaSO4, carbon black, zeolite, kaolin and mixtures thereof, and
- (ii) at least one crystalline polyester layer devoid of pigment,
- where the ratio of the respective thickness of the layer devoid of pigment to the pigmented layer is at least 1 and
- where the pigment has a particle size comprised between 0.02 and 1.0 μm.
1 more element
Dependencies are inferred from the claim text.