Radiation-Curable Adhesive Mixture with Non-Aromatic Rings
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Solution Overview
Problem
Radiation-crosslinkable pressure-sensitive adhesives face challenges in achieving both good adhesion and cohesion, especially at high layer thicknesses, and often compromise on thermal stability, making them unsuitable for industrial applications requiring high heat resistance.
Innovation Solution
A mixture of polymers A) and compounds B) is developed, where polymer A) is composed of free-radically polymerizable monomers and contains a photoinitiator, and compounds B) have ethylenically unsaturated, radically polymerizable groups with a non-aromatic ring system, specifically isocyanurate or cycloaliphatic ring systems, to enhance cohesion and adhesion while maintaining thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If radiation-crosslinkable polymers are used to achieve good cohesion through photochemically induced crosslinking, then cohesion is improved, but adhesion deteriorates
Solution Approach 1:
The patent changes the chemical structure parameters of the crosslinking agents by using compounds with non-aromatic ring systems (isocyanurate or cycloaliphatic) instead of conventional aromatic crosslinkers. This structural modification allows the system to achieve both good adhesion and cohesion by altering the reactivity and bonding characteristics of the crosslinking process
Solution Approach 2:
The invention creates a composite adhesive system combining radiation-curable polymer matrices with specific low-molecular-weight compounds containing non-aromatic ring systems. This composite approach allows the adhesive to exhibit both strong bonding (adhesion) and internal strength (cohesion) simultaneously, resolving the traditional trade-off between these two properties
2Reliability
If measures are taken to improve adhesion, then adhesion is improved, but cohesion deteriorates
Solution Approach 1:
By modifying the molecular parameters of the crosslinking agents to include non-aromatic ring systems, the patent achieves a balanced performance where adhesion-promoting functional groups are maintained while the crosslinking density and strength are optimized through the unique structural properties of isocyanurate and cycloaliphatic rings
3Strength
If radiation-crosslinkable pressure sensitive adhesives are used, then cohesion is improved, but thermal stability deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by replacing aromatic crosslinkers with non-aromatic ring system compounds. This substitution reduces the formation of chromophores and conjugated systems that absorb UV radiation and degrade at high temperatures, thereby improving thermal stability while maintaining radiation-curable cohesion
Solution Approach 2:
The invention converts the potential harm of radiation crosslinking (which can compromise thermal stability) into a benefit by using non-aromatic ring systems that are inherently more thermally stable. The crosslinking process still provides strong cohesion, but the non-aromatic structure prevents thermal degradation, turning a potential weakness into a strength
4Volume of moving object
If high layer thicknesses are used, then coverage is improved, but both adhesion and cohesion deteriorate
Solution Approach 1:
The patent changes the reactivity parameters of the adhesive system by incorporating low-molecular-weight compounds with high functional group density and non-aromatic ring systems. These compounds enable effective crosslinking even through thick layers, maintaining both adhesion and cohesion at high layer thicknesses where conventional adhesives fail
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 mixture provides improved adhesion and cohesion, even at high layer thicknesses, with enhanced thermal stability, making it suitable for industrial applications, particularly in assembly tapes and self-adhesive articles.
Implementation Method 1
Radiation-curable mixture... polymers A) which is obtainable by polymerizing radically polymerizable compounds... compounds B) with ethylenically unsaturated, radically polymerizable groups... photochemically induced crosslinking
Implementation Method 2
at least 10% by weight of the compounds B are compounds B1 with at least one non-aromatic ring system, the non-aromatic ring system of the compounds B1 being an isocyanurate ring system or a bi- or polycyclic cycloaliphatic ring system
Implementation Method 3
the bond has high thermal stability, i.e. H. The bond should be able to withstand mechanical stress even at higher temperatures... very good adhesion and particularly high cohesion are achieved... heat resistance is also improved
Data Source
AI summary
The invention relates to a mixture containing A) a polymer which can be obtained by polymerization of radically polymerizable compounds, and B) compounds having ethylenically unsaturated, radically polymerizable groups (polymerizable group for short), and a weight average molecular weight Mw of less than 5000 g/mol. The mixture according to the invention is characterized in that at least 10% by weight of compounds B are compounds B1 having at least one non-aromatic ring system.