Process for dyeing a hydrolysis resistant polyester film
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United States of America Patent
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Jan 2, 2024
Grant Date -
May 12, 2022
app pub date -
Oct 25, 2021
filing date -
Nov 6, 2020
priority date (Note) -
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Abstract
The present disclosure relates to a process for dyeing a hydrolysis-resistant polyester film. The process comprises dyeing of a hydrolysis resistant polyester film in a dye bath comprising at least one coloring agent (dye), at least one polyhydric alcohol, and optionally at least one UV absorber to obtain a dyed film. The dyed film is subjected to quenching followed by cleaning and drying to obtain a dyed hydrolysis-resistant polyester film. The process of the present disclosure is simple, economical, improve hydrolysis resistance, and also retains the mechanical properties of the film when exposed to harsh environmental conditions.
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