Non-Toluene PSA Sheet with Low Silicone Transfer
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Solution Overview
Problem
PSA sheets using non-toluene-based compositions often have lower adhesion performance compared to those using toluene-based compositions, and there is a need to reduce volatile organic compound (VOC) emissions for environmental and health considerations.
Innovation Solution
A PSA sheet with a silicone-based release liner and a non-toluene-based PSA layer composed of a water-dispersed acrylic polymer and tackifier resin emulsion, where the silicone transfer from the release layer is limited to 10 kcps or less, reducing VOC emissions and enhancing adhesion properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a non-toluene-based PSA composition is used, then VOC emission is reduced, but adhesion performance deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters of the PSA layer by using water-dispersed acrylic polymer and tackifier resin emulsion instead of conventional toluene-based compositions. This parameter change reduces VOC emission while maintaining adhesion performance through optimized formulation of alternative materials.
Solution Approach 2:
The invention creates a composite PSA layer combining water-dispersed acrylic polymer with tackifier resin emulsion. This composite material structure provides both low VOC emission and satisfactory adhesion properties, resolving the contradiction between environmental friendliness and bonding performance.
2Ease of operation
If a silicone-based release agent is used, then heat resistance and handling ease are improved, but silicone transfer to PSA layer increases
Solution Approach 1:
The invention optimizes the silicone transfer parameter by controlling the release layer composition and curing conditions. By adjusting these parameters, the patent achieves low silicone transfer (10 kcps or less) while maintaining the heat resistance and handling ease benefits of silicone-based release agents.
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 achieves superior adhesion performance while significantly reducing VOC emissions, making the PSA sheet more environmentally friendly and suitable for use in enclosed spaces and high-temperature applications.
Implementation Method 1
a polysiloxane containing two or more Si-H groups is a molecule thereof and a polysiloxane containing two or more Si-H group-reactive functional groups in a molecule thereof
Implementation Method 2
a PSA layer provided on the release layer... a PSA composition that composes the PSA layer is an aqueous dispersion containing a water-dispersed acrylic polymer and a tackifier resin emulsion
Data Source
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AI summary
The present invention provides a pressure-sensitive adhesive (PSA) sheet provided with a non-toluene-based PSA layer and having superior adhesion properties. A PSA sheet 8 is provided with a release liner 87 having, on at least a first side thereof, a release layer composed of a silicone-based release agent, and a PSA layer 85 provided on the release layer. A PSA composition that composes the PSA layer 85 contains a water-dispersed acrylic polymer and a tackifier resin emulsion prepared using a solvent that does not contain an aromatic hydrocarbon-based organic solvent. The release layer has an amount of silicone that transfers to Single-Sided Adhesive Tape No. 31B manufactured by Nitto Denko Corporation of 10 kcps or less per unit surface area equivalent to a circle having a diameter of 30 mm when determined as X-ray intensity of silicon by X-ray fluorescence analysis.