Poly(meth)acrylate Primer for Silicone Adhesive Delamination
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Solution Overview
Problem
Silicone-based adhesives often delaminate from backings due to weak interactions, requiring chemical priming treatments that involve organic solvents, catalysts, and initiators, and rely on hydrolytically unstable -Si-O-C- bonds for adhesion.
Innovation Solution
A poly(meth)acrylate-based primer layer using carbon-carbon (-C-C-) bonds instead of -Si-O-C- bonds, formed from a poly(meth)acrylate siloxane precursor, which promotes adhesion between silicone-based adhesives and backings without the need for organic solvents, catalysts, or initiators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If chemical priming treatments are used to improve adhesion of silicone-based adhesive to backing, then adhesion strength is improved, but process complexity and environmental harm increase due to organic solvents, catalysts, and initiators
Solution Approach 1:
The patent removes harmful components (organic solvents, catalysts, initiators) from the priming treatment process while maintaining adhesion promotion functionality through a simplified poly(meth)acrylate-based primer applied directly to the backing
Solution Approach 2:
The patent changes the chemical composition parameters of the primer from traditional chemistries requiring solvents and catalysts to a poly(meth)acrylate-based formulation that cures without these additives, fundamentally altering the process requirements
2Strength
If -Si-O-C- bonds are used to promote adhesion between backing and silicone-based adhesive, then adhesion is achieved, but bond stability deteriorates upon aging due to hydrolytic instability
Solution Approach 1:
The patent changes the chemical bond type from -Si-O-C- to -C-C- bonds in the primer layer, transforming the bond's hydrolytic stability parameter while maintaining adhesion promotion capability
Solution Approach 2:
The patent creates a composite primer layer combining poly(meth)acrylate polymers with carbon-carbon bonding characteristics, integrating both adhesion promotion and hydrolytic stability into a single material system
3Strength
If traditional primer chemistries are used to achieve adhesion promotion, then adhesion is improved, but environmental friendliness deteriorates due to use of organic solvents, catalysts, and initiators
Solution Approach 1:
The patent extracts and eliminates harmful substances (organic solvents, catalysts, initiators) from the primer formulation, retaining only the essential poly(meth)acrylate components needed for adhesion promotion
Solution Approach 2:
The patent converts the traditionally harmful requirement for solvents and catalysts into a benefit by developing a primer system that achieves better adhesion promotion without these harmful additives, turning a process constraint into an environmental advantage
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 stable adhesion between silicone-based adhesives and backings through environmentally friendly processes, enhancing the durability and reliability of the adhesive bond.
Implementation Method 1
irradiating the primer precursor on the backing
Data Source
Figure 1~2
AI summary
An adhesive article comprising a poly(meth)acrylate-based primer layer and methods of making same. The article can include a backing, a primer layer located on a first major surface of the backing, and a silicone-based adhesive located on the primer layer. The primer layer can be derived from a primer precursor comprising poly(meth)acrylate functionalities. The method can include applying a primer precursor onto a first major surface of a backing, the primer precursor comprising a compound comprising poly(meth)acrylate functionalities; irradiating the primer precursor; applying an adhesive on the irradiated primer precursor; and irradiating the adhesive and the irradiated primer precursor to form a primer layer located between the adhesive and the first major surface of the backing.