Radiation-Curable PSA Composition for High Peel Strength
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing pressure sensitive adhesive (PSA) systems face challenges in achieving high peel strength and environmental safety, with solvent-based systems posing environmental hazards and radiation curable systems being difficult to develop effectively.
Innovation Solution
A curable composition comprising an oligomer with specific monomer units and a low viscosity reactive diluent, formulated to have a viscosity of 3000 cP or less, which is cured using light activation to achieve crosslinking and high peel strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If solvent-based PSA systems are used, then processability is improved, but environmental safety deteriorates due to volatile organic compounds
Solution Approach 1:
The patent extracts and removes the solvent component from the PSA system, transitioning from solvent-based to solvent-free radiation-curable formulations. This eliminates volatile organic compounds while maintaining processability through the use of reactive diluents and oligomers that provide appropriate viscosity and flow characteristics without requiring solvent evaporation.
Solution Approach 2:
The patent changes the fundamental parameter of the adhesive system by adopting radiation-curable chemistry (UV or electron beam curing) instead of traditional solvent-based drying or water-based evaporation. This parameter change enables solvent-free formulations that are environmentally safe while achieving rapid curing and good processability through controlled radiation exposure.
2Object-affected harmful factors
If radiation curable PSA systems are developed, then environmental safety is improved, but peel strength deteriorates
Solution Approach 1:
The patent employs composite material design by formulating radiation-curable PSA systems with carefully selected combinations of oligomers (providing adhesive backbone and strength), reactive diluents (controlling viscosity and flexibility), and photoinitiators (enabling curing). This composite approach balances peel strength, processability, and environmental safety, achieving high performance despite the constraints of radiation curability.
Solution Approach 2:
The patent optimizes multiple parameters including oligomer molecular weight, functional group composition, reactive diluent ratio, and radiation dose to achieve the desired balance between peel strength and environmental safety. By adjusting these parameters, the formulation achieves both high adhesive strength and solvent-free environmental benefits.
3Loss of time
If radiation curable PSA systems are developed, then curing time is improved, but peel strength deteriorates
Solution Approach 1:
The patent incorporates preliminary action by pre-formulating the adhesive with optimized oligomer and reactive diluent compositions that are specifically designed to achieve high peel strength upon radiation curing. The formulation is prepared in advance with the correct molecular weight distribution and functional group ratios to ensure rapid curing produces the desired strength, eliminating the need for extended curing times or post-processing.
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 fast curing and high peel strength while being environmentally safe, overcoming the limitations of traditional PSA systems.
Implementation Method 1
curing the curable composition by irradiating the curable composition with a light source having a wavelength and/or an intensity that is able to activate the polymerized chromophore monomer units of the oligomer and cause crosslinking of said oligomer and/or said reactive diluent
Data Source
AI summary
The present invention relates to a curable composition comprising an oligomer and a low viscosity reactive diluent. The oligomer comprises polymerized high Tg monomer units, polymerized low Tg monomer units, polymerized chromophore monomer units, and optionally at least one polymerized additional monomer unit. The invention also relates to use of the curable composition as a pressure sensitive adhesive curable composition and methods of coating a substrate.