UV-Crosslinked Acrylic Adhesive for Heat-Resistant Peel Strength
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Solution Overview
Problem
Existing hot-melt pressure sensitive adhesives have limited cohesive strength and heat resistance, restricting their application in various environments and uses.
Innovation Solution
An energy-beam-crosslinkable pressure sensitive adhesive composition is developed, comprising an acrylic resin with a benzophenone structure and a styrene-based tackifier, which forms a crosslinked structure upon energy beam irradiation, enhancing peel strength and holding power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If SIS block copolymer is used as base resin for synthetic rubber pressure sensitive adhesive, then the adhesive can exhibit sufficient strength at normal temperature through physical pseudo crosslinking, but the cohesive strength is significantly reduced by heating and the adhesive melts when temperature exceeds certain level
Solution Approach 1:
The patent changes the crosslinking mechanism from physical pseudo crosslinking (reversible, temperature-dependent) to chemical crosslinking via radiation curing (irreversible, temperature-stable). By introducing acrylic resin with vinyl groups and using ultraviolet irradiation to form covalent bonds, the adhesive maintains cohesive strength at elevated temperatures while retaining processability during application.
Solution Approach 2:
The patent creates a composite adhesive system combining synthetic rubber (for adhesion and elasticity) with acrylic resin (for crosslinking and heat resistance). This composite structure allows the adhesive to benefit from both the tackiness and flexibility of rubber and the thermal stability and strength of crosslinked acrylic networks.
2Strength
If radiation curable hot-melt adhesive composition is used to improve cohesive strength through crosslinking reaction, then the holding power improves, but the effect is limited and further improvement is required
Solution Approach 1:
The patent optimizes the vinyl group content in the acrylic resin component to specifically control the degree of crosslinking. By adjusting the vinyl group content to 0.1-5.0 mass% of the acrylic resin, the patent achieves optimal balance between cohesive strength and holding power, preventing over-crosslinking that would reduce pressure sensitivity while ensuring sufficient crosslinking for thermal stability.
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 composition achieves improved peel strength and holding power, making it suitable for broader applications and environments while maintaining shape conformability and transparency.
Implementation Method 1
an acrylic resin (A) having energy beam crosslinkability... forms a crosslinked structure upon energy beam irradiation
Implementation Method 2
undergoes a crosslinking reaction by irradiation with ultraviolet light... irradiating the energy-beam-crosslinkable pressure sensitive adhesive composition with an energy beam
Data Source
AI summary
An energy-beam-crosslinkable pressure sensitive adhesive composition, including an acrylic resin (A) having energy beam crosslinkability, and a tackifier (B). The tackifier (B) contains a styrene-based resin (B1). A pressure sensitive adhesive sheet including an energy-beam-crosslinkable pressure sensitive adhesive composition layer containing the energy-beam-crosslinkable pressure sensitive adhesive composition on a substrate or a release liner.