Laminated polyester film

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By constructing a coating layer formed of a hydrophobic blocked isocyanate compound and a water dispersible polyurethane resin with a carboxy group on the polyester film, the adhesion and durability of the polyester film are solved, and high transparency and excellent adhesion are achieved.

CN115697706BActive Publication Date: 2025-03-21TOYOBO CO LTD

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Patent Information

Application Number: CN202180037538.8
Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner
Priority Date: 2020-06-19
Filing Date: 2021-05-28
Publication Date: 2025-03-21
Estimated Expiration: 2041-05-28

Application Information

Patent Timeline

19 Jun 2020

Priority

28 May 2021

Application

CN202180037538.8

21 Mar 2025

Publication

CN115697706B

IPC: B32B27/36; B32B27/40; C08L75/04; C09D175/06; C08G18/00

CPC: B32B27/36; C08G18/00; C08L75/04; B32B27/40; C09D175/06

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Application Domain

Synthetic resin layered products Polyurea/polyurethane coatings

Technical Efficacy Phrases

Increased durability good adhesion

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AI Technical Summary

Technical Problem

The conventional polyester film lacks adhesion to various coatings, resins, and inks during processing, and the dispersion stability and durability of the water-dispersible blocked isocyanate crosslinking agent are insufficient.

Method used

A coating layer formed of a hydrophobic blocked isocyanate compound, a water-dispersible polyurethane resin having a carboxyl group, and a water-dispersible polyester resin is used to hydrophilize it by an anionic emulsifier to construct a core-shell structure to improve dispersion stability and adhesion.

Benefits of technology

It has achieved a coating layer with high transparency, excellent durability and few coating defects, and has the best easy adhesiveness, especially excellent adhesion to UV ink.

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Abstract

The present invention aims to provide a laminated polyester film having excellent transparency (low haze) and durability, and having a coating layer with few coating film defects, and having the best adhesiveness in all fields such as optics, packaging, and labels. The present invention is a laminated polyester film having a coating film formed of a coating liquid, wherein the coating liquid comprises an aqueous dispersion of a hydrophobic blocked isocyanate compound hydrophilized by an anionic emulsifier, a water-dispersible polyurethane resin having a carboxyl group, and a water-dispersible polyester resin, and the peeling defect of the coating film is less than 5.0 pieces / m 2 .

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