Silane Primer Copolymer Adhesion on Glass
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Solution Overview
Problem
Existing primer compositions fail to effectively improve the adhesion of adhesive tapes on glass surfaces and do not accommodate the incorporation of functional fillers without compromising their adhesion-promoting effect.
Innovation Solution
A primer composition comprising a copolymer obtained by radical copolymerization of vinyl caprolactam, vinylpyrrolidone, acrylic acid esters, and organofunctional silanes, with butyl acrylate as a key monomer, which forms an excellent adhesion-promoting layer on hydrophilic surfaces like glass, allowing for the incorporation of fillers without reducing adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional primer compositions are used to improve adhesion on glass surfaces, then adhesion promotion is attempted, but the adhesion effect is insufficient and fillers cannot be incorporated
Solution Approach 1:
The patent changes the chemical composition parameters of the primer by incorporating specific silane compounds (glycidoxy-functional, amino-functional, vinyl-functional silanes) and reactive acrylic resins in optimized ratios. This parameter change enables the primer to maintain adhesion promotion while accepting filler incorporation, resolving the contradiction between adhesion strength and filler adaptability
Solution Approach 2:
The patent creates a composite primer system combining silane compounds, reactive acrylic resins, and optional fillers. This composite material approach allows the primer to simultaneously achieve adhesion promotion on glass surfaces and accommodate functional fillers without compromising performance, thus resolving the technical contradiction
2Adaptability or versatility
If fillers are incorporated into conventional primers, then additional functionalities are achieved, but adhesion-promoting effect is lost
Solution Approach 1:
The patent optimizes the concentration parameters of silane compounds (0.1-5% by mass) and reactive acrylic resin (1-30% by mass) to maintain adhesion promotion even with filler present. This parameter optimization ensures that the primer retains its adhesion-strengthening capability while accommodating fillers for additional functionalities
Solution Approach 2:
The silane compounds act as intermediary substances that bridge the gap between the primer matrix and fillers, while simultaneously providing adhesion promotion on glass surfaces. This intermediary role allows fillers to be incorporated without sacrificing adhesion strength, as the silanes mediate between the filler particles and the substrate/adhesive interface
3Strength
If silane primers are used to promote adhesion on glass, then adhesion improvement is attempted, but they lack components for adhesion to pressure-sensitive adhesives
Solution Approach 1:
The patent creates a composite primer system that combines silane compounds (for glass adhesion) with reactive acrylic resins (for compatibility with pressure-sensitive adhesives). This composite formulation resolves the contradiction by integrating both functional requirements into a single primer composition that promotes adhesion to both glass substrates and pressure-sensitive adhesive tapes
Solution Approach 2:
The primer is designed with multi-functionality to simultaneously achieve adhesion promotion on glass surfaces and compatibility with pressure-sensitive adhesives. The combination of silane compounds and reactive acrylic resins gives the primer universal adhesion capabilities, allowing it to function effectively at both the substrate interface and the adhesive interface
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 primer composition achieves excellent adhesion of adhesive tapes to glass surfaces, even with high filler concentrations, ensuring cohesive failure within the tape and maintaining or enhancing the adhesion-promoting effect, while enabling the addition of fillers for additional functionalities such as opacity or conductivity.
Implementation Method 1
Silane primers or silane adhesion agents or adhesion promoters are often used to promote adhesion on hydrophilic substrates such as glass
Implementation Method 2
Silane primers... are often used to promote adhesion on hydrophilic substrates such as glass
Data Source
AI summary
The invention relates to a primer comprising a mixture dissolved or dispersed in one or more solvents of: - a copolymer of vinylcaprolactam and/or vinylpyrrolidone obtained by copolymerization, preferably radical copolymerization, and one or more of the following monomers: a) an acrylic ester of a linear, primary alcohol with 2 to 10 carbon atoms in the alkyl group of the alcohol, b) an acrylic ester of a branched, non-cyclic alcohol with 4 to 12 carbon atoms in the alkyl group of the alcohol, c) acrylic acid, - one or more organofunctional silanes. Such a primer enables good adhesion between pressure-sensitive adhesive tapes and hydrophilic surfaces, such as glass in particular. The adhesion-promoting effect is retained even if the primer additionally contains functional fillers.