Cure-in-Place Pressure-Sensitive Adhesive Composition
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Solution Overview
Problem
Conventional pressure-sensitive adhesives (PSAs) lack high adhesion over a wide temperature range and require additional curing steps, which can be complex and inefficient.
Innovation Solution
Development of a pressure-sensitive adhesive composition comprising reactive oligomers blended with high molecular weight acrylate polymers, which can be cured in place using UV light or surface catalysis, achieving enhanced strength and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional pressure-sensitive adhesives are used, then the adhesive can be applied immediately, but the adhesion strength is insufficient and requires additional curing steps
Solution Approach 1:
The patent combines the pressure-sensitive adhesive properties and curing functionality into a single composition. The adhesive contains both the PSA matrix and reactive oligomers that can cure in place, merging the application and curing steps into one integrated system, thereby eliminating separate curing equipment and processes while achieving high adhesion strength.
Solution Approach 2:
The adhesive composition is prepared in advance with latent reactive oligomers embedded in the PSA matrix. These oligomers are pre-positioned to react with surface catalysts or UV light after application, performing the curing action immediately upon contact with the substrate, thus eliminating the need for subsequent separate curing steps.
2Strength
If additional curing steps are added to improve adhesion strength, then the adhesive strength increases, but the process time and complexity increase
Solution Approach 1:
The adhesive composition contains latent reactive oligomers that automatically react with surface catalysts or UV light after application. The system performs its own curing function without requiring external curing equipment or additional processing steps, thereby achieving high adhesion strength while minimizing process time and eliminating idle waiting periods.
3Ease of operation
If the adhesive is made inherently tacky for immediate bonding, then the ease of operation improves, but the temperature range for effective adhesion is limited
Solution Approach 1:
The patent creates a composite adhesive system combining a pressure-sensitive adhesive matrix with reactive oligomers. The PSA matrix provides inherent tackiness for immediate bonding across a wide temperature range, while the reactive oligomers enhance adhesion strength through in-place curing. This composite structure allows the adhesive to maintain both ease of operation and broad temperature adaptability simultaneously.
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 adhesive composition exhibits significantly higher strength and flexibility, maintaining adhesion across a broad temperature range without the need for additional curing steps, making it suitable for various applications.
Implementation Method 1
The blend is inherently tacky and can be cured by exposing the blend to a compound containing an oligomeric silane such as may be printed on a mating surface.
Implementation Method 2
The adhesives are typically formed by blending reactive oligomers with one or more high molecular weight acrylate polymers... Crosslinking can be triggered by surface catalysis, UV irradiation, or other cure mechanisms.
Data Source
AI summary
Cure in place pressure sensitive adhesive compositions are described that comprise one or more of a bodying component, a structural diluent, a radical diluent as well as additives such as crosslinkers, external catalysts, photoinitiators and stabilizers/process aids. The bodying component can be acrylic or non-acrylic.