Ray-Curable Polyester Adhesive for Thermal-Stable Hot-Melt Coating
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Solution Overview
Problem
Existing solvent-free pressure-sensitive adhesives face issues with thermal stability, such as viscosity increase and gelation, due to the presence of unsaturated groups that react during high-temperature processes, and there is a need for adhesives with improved environmental sustainability.
Innovation Solution
An active energy ray-curable composition containing a polyester with structural units derived from polyvalent carboxylic acid and polyhydric alcohol, and optionally a compound with a photoreactive group, which eliminates the need for unsaturated groups, ensuring excellent thermal stability and adhesive properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If unsaturated groups are incorporated into the pressure-sensitive adhesive to increase cohesive force and enable active energy ray curability, then adhesive performance is improved, but thermal stability deteriorates due to viscosity increase and gelation during hot-melt coating
Solution Approach 1:
The invention extracts and removes the harmful unsaturated groups from the pressure-sensitive adhesive composition while preserving the essential functions of active energy ray curability and cohesive force through alternative mechanisms using polyester polymers and photoinitiators without requiring polymerizable unsaturated groups
Solution Approach 2:
The invention changes the chemical composition parameters by using specific polyester polymers with controlled molecular weights and functionalities, combined with photoinitiators that enable curing without unsaturated groups, thereby achieving both adhesive performance and thermal stability
2Object-generated harmful factors
If solvent-free pressure-sensitive adhesives are used to reduce environmental load, then environmental sustainability is improved, but thermal stability deteriorates due to viscosity increase during high-temperature processing
Solution Approach 1:
The invention removes organic solvents from the pressure-sensitive adhesive composition to eliminate VOC emissions and improve environmental sustainability, while simultaneously removing unsaturated groups that cause thermal instability, achieving both environmental and thermal performance
Solution Approach 2:
The invention uses composite formulations combining polyester polymers with specific photoinitiators and optional crosslinking agents to achieve solvent-free composition that maintains both environmental sustainability and thermal stability through synergistic material combinations
3Strength
If crosslinking agents are added to active energy ray-curable adhesives to enhance cohesive force, then adhesive strength is improved, but manufacturing complexity increases due to additional reaction components
Solution Approach 1:
The invention merges the functions of the polyester polymer and photoinitiator to achieve both active energy ray curability and cohesive force enhancement without requiring separate crosslinking agents, simplifying the composition to two main components while maintaining high adhesive strength
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 provides excellent active energy ray curability, pressure-sensitive adhesive force, and holding force without unsaturated groups, making it suitable for solvent-free applications like tapes and labels with improved thermal stability.
Implementation Method 1
active energy ray-curable pressure-sensitive adhesives that are cured by an active energy ray, such as an ultraviolet ray
Data Source
AI summary
The present disclosure relates to an active energy ray-curable composition containing a polyester (A) having a structural unit derived from a polyvalent carboxylic acid (α) and a structural unit derived from a polyhydric alcohol (β).