Silicone Pressure Sensitive Adhesive with Boron Additives
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Solution Overview
Problem
Silicone pressure sensitive adhesives (PSAs) exhibit low adhesion to low energy surfaces such as silicone, fluoropolymer, and polyolefin materials without surface treatment, and while additives like trialkyl borate can increase adhesion, they are not effective at high loading due to incompatibility issues.
Innovation Solution
Incorporating boron-containing additives, including boroxine-based, borane-based compounds with covalent boron-nitrogen bonds, cyclic borates, and acyclic borates, into the silicone PSA composition to enhance adhesion to low energy surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If trialkyl borate is added to increase adhesion to low energy surfaces, then adhesion improves, but incompatibility with PSAs occurs at high loading
Solution Approach 1:
The patent changes the chemical structure parameters of the boron-containing additive from conventional trialkyl borate to novel boroxine-based and borane-based compounds with specific molecular architectures. This structural parameter change enables the additive to achieve high adhesion promotion effectiveness at low concentrations (0.01-10 wt%) without causing incompatibility issues that plague conventional additives at high loadings.
Solution Approach 2:
The patent creates a composite adhesive system by combining silicone PSA base polymers with specific boron-containing compounds (boroxine-based or borane-based). This composite approach leverages the synergistic interaction between the silicone polymer matrix and the boron-containing additive, where the additive provides adhesion enhancement while maintaining compatibility within the composite system at optimized loadings.
2Strength
If conventional trialkyl borate is used as additive, then adhesion increases somewhat, but adhesion remains insufficient even at conventional additive amounts
Solution Approach 1:
The patent fundamentally changes the chemical parameters of the boron-containing additive to achieve superior adhesion promotion efficiency. The novel boroxine-based and borane-based compounds exhibit much higher adhesion promotion effectiveness per unit concentration compared to conventional trialkyl borate, enabling sufficient adhesion (exceeding 300 gf/in) to be achieved at low additive loadings (0.01-10 wt%) rather than requiring high concentrations.
3Strength
If large amount of trialkyl borate is used to increase adhesion, then adhesion improves, but incompatibility with PSAs occurs
Solution Approach 1:
The patent changes the chemical structure parameters of the boron-containing additive to achieve high adhesion promotion at low concentrations. By using novel boroxine-based and borane-based compounds instead of conventional trialkyl borate, the system achieves sufficient adhesion improvement with minimal additive loading (0.01-10 wt%), thereby avoiding the incompatibility and stability issues that arise from high loading of conventional additives.
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 boron-containing additives significantly improve the peel adhesion of silicone PSAs to low energy surfaces by up to 100% compared to conventional trialkyl borate, providing a clear and stable adhesive composition with long-term stability.
Implementation Method 1
silicone pressure sensitive adhesive compositions and articles comprising the same... having improved adhesion especially to low energy surfaces
Data Source
AI summary
The present invention relates to a silicone pressure sensitive adhesive composition comprising a boron-containing additive containing a boron-containing compound selected from the group consisting of a boroxine-based compound and a borane-based compound containing a covalent boron-nitrogen bond. The present invention also relates to an article such as a pressure sensitive adhesive tape comprising the silicone pressure sensitive adhesive composition.