Anti-blush and chemical resistant polyester film
AssigneeToray Plastics (America), Inc.
InventorsJan Moritz, Robert Ervolino
Life of this patent
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Abstract
Embodiments herein relate to a polymer film comprising an anti-blushing composition in a blend comprising polyethylene terephthalate (PET) and polybutylene terephthalate (PBT); wherein the blend contains at least 50 wt. % of PBT; wherein the anti-blushing composition comprises a phosphorus containing compound but excludes certain phosphorus compounds; and wherein the anti-blushing composition is configured to prevent blushing in the polymer film laminated directly to a metal substrate sheet and exposed to steam at a temperature of 260° F. for 90 minutes.
Claims19
A method of reducing blushing on a film laminated to a metal, comprising:
- a. exposing the film to a retort process, and
- b. obtaining a blush-free film after the retort process;
- c. wherein the film comprises a polyethylene terephthalate (PET), a polybutylene terephthalate (PBT) and a derivative of bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite, and
- d. wherein the derivative comprises a phosphate and has a higher molecular weight than that of the bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite.
Dependencies are inferred from the claim text.