Adhesion Promoter for Low Surface Energy Substrates
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Solution Overview
Problem
Existing adhesives fail to effectively bind to low surface free energy substrates contaminated with fuser oils, leading to poor adhesion and increased viscosity issues at high temperatures, which complicates applications like bookbinding and Xerographic printing.
Innovation Solution
A silane composition comprising at least two hydrolytic silane compounds admixed with an aqueous buffer solution is used to create an adhesion promoter that maintains stable viscosity and adhesion properties at temperatures from 100°C to 200°C, allowing for effective bonding to substrates with low surface free energy even when contaminated with fuser oils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If amino or mercapto functional hydrolytic silane compounds are added to adhesives as adhesion promoters, then adhesion to low surface free energy substrates is improved, but the pot life of the adhesive decreases and viscosity continuously increases during application
Solution Approach 1:
The patent divides the adhesion promoter into two separate components: a silane compound (for adhesion promotion) and an aqueous buffer solution (for stability control). This segmentation allows each component to perform its specific function independently, resolving the contradiction between adhesion strength and pot life.
Solution Approach 2:
The aqueous buffer solution acts as an intermediary that moderates the reaction between the silane compound and the adhesive. It controls the hydrolysis rate of the silane, preventing premature crosslinking that would reduce pot life, while still enabling the silane to provide adhesion promotion when properly activated.
2Strength
If amino or mercapto functional hydrolytic silane compounds are added to adhesives as adhesion promoters, then adhesion to low surface free energy substrates is improved, but viscosity continuously increases at application temperature
Solution Approach 1:
By separating the adhesion promoter into a silane compound and an aqueous buffer solution, the patent prevents uncontrolled viscosity increase. The buffer solution component regulates the silane's reactivity, maintaining stable viscosity during application while preserving adhesion promotion capability.
Solution Approach 2:
The patent changes the chemical environment by introducing an aqueous buffer solution with controlled pH. This parameter change stabilizes the silane compound's hydrolysis rate, preventing excessive crosslinking that would cause viscosity increase, while maintaining the conditions necessary for adhesion promotion.
3Ease of manufacture
If conventional adhesives are used on Xerographic prints contaminated with fuser oil, then application is simple, but adhesion to the low surface free energy substrate fails
Solution Approach 1:
The silane compound acts as a chemical intermediary between the adhesive and the fuser oil-contaminated substrate. It reacts with both the substrate (even through the oil contamination) and the adhesive, creating a bridging layer that enables adhesion where conventional adhesives fail.
Solution Approach 2:
The patent changes the chemical parameters of the adhesive system by incorporating hydrolytic silane compounds that can react with low surface free energy substrates. This chemical modification enables the adhesive to bond to contaminated Xerographic prints while maintaining application simplicity.
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 adhesion promoter ensures stable viscosity and adhesion performance over time, preventing operational issues and achieving strong binding to substrates with low surface free energy, such as Xerographic prints contaminated with fuser oils, even after prolonged use at high temperatures.
Implementation Method 1
the silane composition comprises at least two hydrolytic silane compounds
Implementation Method 2
The admixed silane composition with aqueous buffer solution improves the thermal stability of the adhesive and the viscosity of the adhesive remains relatively constant at temperatures, for example, ranging from about 100° C. to about 200° C.
Data Source
AI summary
An adhesion promoter for a hot melt adhesive or a pressure sensitive adhesive prepared by admixing a silane composition with an aqueous buffer solution, where the silane composition includes at least two silane compounds. The adhesive is able to bind at very low surface free energy substrates, such as Xerographic prints contaminated by silicone fuser oil. The hot melt adhesive maintains a substantially stable viscosity at temperature ranging from about 100° C. to about 200° C.