Flexible Release Liner Coating for Low Adhesive Transfer
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Solution Overview
Problem
Existing release liners and low adhesion backsizes (LABs) face challenges in providing reliable, economical, and stable release surfaces for adhesives, especially under conditions of heat, humidity, and pressure, leading to adhesive transfer and increased costs.
Innovation Solution
A flexible substrate coated with a fluorinated polymer layer on a metal or metal oxide surface, forming a low surface energy monolayer that reduces adhesive transfer and maintains stable release properties, even under adverse conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional release liners use thick silicone coatings to provide release properties, then release performance is achieved, but material cost increases and adhesive transfer occurs
Solution Approach 1:
The patent changes the surface energy parameter of the release liner by using fluorinated polymer coatings with significantly lower surface energy (10-15 dynes/cm) compared to traditional silicone coatings. This parameter change enables reliable release performance while preventing adhesive transfer, as the low surface energy creates a barrier that adhesives cannot bond to effectively.
Solution Approach 2:
The patent employs composite material structures combining fluorinated polymers with metal or metal oxide substrates. This composite approach provides both the mechanical strength of the substrate and the low surface energy properties of the fluorinated coating, achieving superior release performance without the material transfer issues of traditional thick silicone liners.
2Stability of the object's composition
If release liners use thick coatings to ensure stable release properties, then release stability is improved, but material cost increases
Solution Approach 1:
The patent achieves stable release properties by optimizing the surface energy parameter through fluorinated polymer coatings. The extremely low surface energy (10-15 dynes/cm) provided by these coatings ensures consistent release performance across varying conditions, eliminating the need for thick material applications.
Solution Approach 2:
The patent adopts a thin-film fluorinated polymer coating approach that uses minimal material quantity while maintaining durable release properties. This thin-film technology reduces material consumption and cost compared to traditional thick silicone coatings, making the release liner more economical without sacrificing performance stability.
3Reliability
If release liners are designed for high release performance, then adhesive release is improved, but adherence to adhesive during winding deteriorates
Solution Approach 1:
The patent precisely controls the surface energy parameter of the release liner to fall within the optimal range of 10-15 dynes/cm. This parameter optimization creates a balanced state where the liner adheres sufficiently to hold adhesives during winding and handling, yet releases easily when required, resolving the contradiction between retention and release.
Solution Approach 2:
The patent applies fluorinated polymer coatings with specific local properties to the release liner surface. The coating provides localized low surface energy regions that prevent adhesive bonding, while the overall liner structure maintains mechanical integrity and sufficient adherence for handling. This local quality approach enables simultaneous achievement of release performance and handling stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a cost-effective, durable, and reliable release surface with low adhesive transfer, maintaining stable release performance for various adhesives, including aggressive ones like silicones, and supports efficient roll-up processes.
Implementation Method 1
surface coatings for use on flexible substrates to create a low surface energy such that an adhesive applied to the substrate can subsequently be removed without the transfer of material
Data Source
AI summary
An article comprising a flexible polymer substrate having two major surfaces, a surface layer comprising metal, metal oxide, silicon oxide, or combinations thereof disposed on at least one major surface of the flexible polymer substrate; and a coating disposed on at least one surface layer, wherein the coating comprises a fluorinated polymer bonded to the surface layer; wherein the fluorinated polymer has the following general formula (I), where n = 6 to 120; and where n = 6 to 120; and where m = 1 to 25 (R1); (R2); or where m = 1 to 25 (R3).