Polyester packaging material
AssigneePenn Color, Inc.
InventorsKelan Wieloch, Venumadhava S. Eleswarapu, Scott Stamback, James C. Walsh, Fred Biemuller
Life of this patent
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Abstract
White goniochromatic packaging article. The package wall containing a composition useful for blocking light in the spectrum ranges from about 200 nm to about 1200 nm. The composition has polyester, polymethylpentene, and a light scattering pigment. The composition optionally includes at least one other colorant. Each of the polymethylpentene and the light scattering pigment comprise about 0.1 to about 0.5 weight percent of the wall. The polyester and polymethylpentene are immiscible and when subjected to orientation stresses the composition produces a goniochromatic packaging article.
Claims9
A container wall, comprising:
- a polyethylene terephthalate (PET);
- about 0.2 to about 3.0 weight percent polymethylpentene (PMP) based on the weight of the wall;
- and
- about 0.2 to about 4.0 weight percent light scattering pigment based on the weight of the wall, wherein the light scattering pigment is selected from titanium dioxide and zinc sulfide,
- wherein the weight ratio of PMP to light scattering pigment is from about 3:1 to about 1:3,
- wherein the wall has a gonioappearance of less than 10 units, measured with a multi-angle spectrophotometer as CIELAB DECMC with a 45° incident light source between 15° near-specular reflection and 110° far specular reflection, and wherein the light scattering pigment interacts with incident light by primarily diffracting light.
Dependencies are inferred from the claim text.