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 material. 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.
Claims8
A method of producing an article, the method comprising:
- obtaining a composition comprising a mixture of polyethylene terephthalate (PET), polymethylpentene (PMP), and light scattering pigment selected from titanium dioxide and zinc sulfide;
- wherein the mixture comprises about 0.2 wt % to about 3.0 wt % PMP and about 0.2 wt % to about 4.0 wt % light scattering pigment, based on the total weight percent of the mixture;
- and the weight ratio of PMP to light scattering pigment is from about 3:1 to about 1:3;
- and
- subjecting the composition to an orientation stress to produce the article,
- wherein a wall of the article 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.
Dependencies are inferred from the claim text.