PLA Release Layer with Alkyl Copolymer for Adhesive Noise
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Solution Overview
Problem
Current adhesive tapes face challenges with release layers that are either too adhesive, leading to difficulties in removal and noise issues due to film properties, and there is a need for improved biodegradable and renewable materials for sustainable solutions.
Innovation Solution
The development of polylactic acid (PLA) polymer-based compositions with a copolymer containing a long chain alkyl moiety and a miscible second moiety, used to form a release layer in adhesive articles, which can be oriented to enhance release properties and reduce noise, and are biodegradable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional release layers are used in adhesive tapes, then release function is provided, but the release layers are either too adhesive causing removal difficulties and noise issues, or insufficiently adhesive compromising tape performance
Solution Approach 1:
The release layer is formed from a composite composition containing polylactic acid polymer and a copolymer with long chain alkyl moiety (such as ethylene-vinyl acetate-octadecyl alcohol copolymer). This composite structure combines the biodegradable PLA matrix with the release-active copolymer, achieving optimal release properties while eliminating noise issues associated with conventional release layers
Solution Approach 2:
The invention changes the chemical composition parameters of the release layer by incorporating copolymers with specific long chain alkyl moieties (C18-C22) into the PLA matrix. This parameter modification alters the surface properties and adhesion characteristics, enabling controlled release without the harmful noise effects of traditional release layers
2Reliability
If non-biodegradable materials are used for release layers, then release properties can be optimized, but environmental sustainability and biodegradability are compromised
Solution Approach 1:
The invention modifies the chemical composition by using polylactic acid polymer as the base matrix instead of conventional non-biodegradable polymers. PLA is a biodegradable polyester that maintains adequate release properties when combined with appropriate copolymers, thus achieving both reliable release function and environmental sustainability
Solution Approach 2:
By creating a composite of polylactic acid polymer with copolymers containing long chain alkyl moieties, the invention achieves a material system that combines the biodegradability of PLA with the release-active properties of the copolymer, eliminating the need for non-biodegradable materials while maintaining release reliability
3Strength
If release layers with high adhesion are used, then tape performance is improved, but removal becomes difficult and noise issues arise
Solution Approach 1:
The release layer composition is designed with local quality differentiation through the copolymer structure, where the long chain alkyl moiety provides the release-active surface properties while the PLA matrix provides structural integrity. This localized functional distribution enables controlled adhesion that facilitates easy removal without compromising tape performance
Solution Approach 2:
The composite of PLA and copolymer creates a release layer with optimized adhesion characteristics - strong enough to hold the tape during use but weak enough to allow easy removal without noise or residue, resolving the contradiction between adhesion strength and removal ease
Data Source
AI summary
Compositions and films are described comprising a polylactic acid (PLA) polymer. The composition further comprises a copolymer comprising a long chain alkyl moiety. The copolymer further comprises a second moiety that is miscible in the polylactic acid polymer. In favored embodiments, the composition comprising the polylactic acid polymer and copolymer may be used to form a release layer of an adhesive article such as a pressure sensitive adhesive tape. The films may be a monolithic film or a film layer of a multilayer film. The release layer may be disposed upon a substrate layer. The substrate layer may also comprise polylactic acid polymer. The substrate layer may be coextruded with the release layer. In some favored embodiments, the film or film layer is oriented.