Release Liner Peel Force Control via Catalyst Poisoning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing release liners for adhesive tapes face challenges in maintaining consistent peel forces, requiring multiple liners with different silicone resin contents and experiencing post-curing delays, which increases storage costs and can lead to 'adhesive lock-up' issues, making it difficult to remove the liner from the pressure-sensitive adhesive (PSA).
Innovation Solution
Treating silicone coatings on release liners with compounds that act as contact poisons for hydrosilylation catalysts, such as ruthenium, rhodium, and platinum complexes, to regulate peel forces and reduce maturation time, thereby preventing 'adhesive lock-up' and ensuring consistent performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If release liners are produced with different silicone resin contents to achieve different peel forces, then the variety of peel forces is improved, but the device complexity and manufacturing complexity increase
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition parameters of the silicone coating through the introduction of contact poisons. Instead of producing multiple types of liners with different silicone resin contents, the invention achieves different peel force levels by varying the concentration and type of contact poison additives in a standardized silicone coating formulation. This allows a single manufacturing process to produce liners with regulated peel forces suitable for different PSA applications.
2Loss of time
If release liners are used immediately after production, then the loss of time is reduced, but the reliability deteriorates due to post-curing delays and adhesive lock-up
Solution Approach 1:
The patent applies preliminary action by pre-treating the silicone coating with contact poisons during the coating process. This preliminary treatment prevents the subsequent post-curing phenomenon and adhesive lock-up that would otherwise occur during storage. By addressing the crosslinking issue in advance through contact poison addition, the liner is prepared for immediate use without requiring maturation time, while maintaining reliable and consistent peel force characteristics.
3Strength
If crosslinking catalysts are used in silicone coatings to improve adhesion, then the strength is improved, but object-generated harmful factors increase due to post-curing and adhesive lock-up
Solution Approach 1:
The patent applies the blessing in disguise principle by converting the harmful effect of catalyst-induced post-curing into a beneficial outcome. Contact poisons are introduced to selectively inhibit the crosslinking reaction between silicone components and PSA, preventing adhesive lock-up. The contact poison acts as a controlled inhibitor that allows the silicone coating to maintain its adhesion function while preventing unwanted secondary crosslinking, thus transforming the potential harm into a benefit by enabling immediate use of the liner.
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 use of contact poisons effectively reduces the peel forces and shortens the maturation time of release liners, allowing for immediate use and preventing 'adhesive lock-up', thus enhancing the usability and storage efficiency of release liners without compromising the adhesive strength of the PSA.
Implementation Method 1
Silicones which can be hardened by hydrosilylation, in particular addition-crosslinking polysiloxanes
Implementation Method 2
hydrosilylation catalysts, in particular platinum, platinum complex compounds or platinum compounds
Data Source
AI summary
The invention relates to a method for producing a release liner which comprises at least one crosslinked silicon coating based on addition crosslinking silicone polysiloxanes and hydrosilylation catalysts, the silicon coating being treated with compounds that are effective as catalyst poisons for hydrosilylation catalysts. The invention further relates to a release liner which can be obtained according to said method and to the use of compounds that are effective as catalyst poisons for hydrosilylation catalysts for treating a silicon coating present on a release liner to control the release forces with which the release liner can be released from a pressure-sensitive adhesive composition that has been coated onto it.