Laminated polylactic acid film

JP7863300B2Active Publication Date: 2026-05-21TOYOBO CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
TOYOBO CO LTD
Filing Date
2026-01-09
Publication Date
2026-05-21

AI Technical Summary

Technical Problem

Polylactic acid films face issues with mechanical strength, heat resistance, transparency, static electricity, and blocking during film manufacturing and storage, which existing solutions either compromise transparency or do not adequately address all these issues simultaneously.

Method used

A laminated polylactic acid film with a stretched polylactic acid film substrate and a resin layer containing an aqueous resin, lubricant particles, and an antistatic agent, optimized for tensile modulus and surface properties to enhance transparency, lubricity, and antistatic performance.

Benefits of technology

The laminated film achieves high transparency, ease of printing and processing, reduced static charge, and resistance to blocking, making it suitable for packaging applications while being biodegradable.

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Abstract

The object of the present invention is to provide a laminated polylactic acid film that is easy to print on and has excellent transparency. [Solution] The present invention relates to a laminated polylactic acid film having a stretched polylactic acid film substrate and a resin layer on at least one surface of the stretched polylactic acid film substrate, wherein the stretched polylactic acid film substrate is substantially free of lubricants, the resin layer is formed of a resin layer forming material containing an aqueous resin and lubricant particles, the tensile modulus of elasticity of the stretched polylactic acid film substrate is 4.0 GPa or more in both the MD and TD directions, and the resin layer forming material may contain an antistatic agent.
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