Urethane Phosphonate Adhesion Promoters for Fast Deep Cure
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Solution Overview
Problem
Existing adhesive compositions face challenges with cure speed and depth of cure, particularly in highly filled opaque/colored systems, leading to inefficiencies in processing time and productivity.
Innovation Solution
A curable composition comprising a multifunctional urethane (meth)acrylate oligomer, urethane (urea) phosphonate adhesion promoter, reactive diluent, and initiator, balanced with a light-emitting curing device that uses a specific wavelength to achieve deep cure and fast cure speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If light-cure on demand compositions are used, then cure speed is improved, but depth of cure is reduced
Solution Approach 1:
The patent employs a light-emitting curing device with specific wavelength parameters (blue light around 450-480 nm) to optimize both cure speed and depth of cure. By adjusting the wavelength and intensity parameters of the curing light, the system achieves rapid curing while maintaining adequate penetration depth through precise parameter matching between the initiator and light source
Solution Approach 2:
The patent implements on-demand curing capability where the curing process can be dynamically controlled - the composition remains uncured during application and positioning, then cures rapidly when exposed to the light-emitting device. This dynamic control allows the system to adapt to different assembly geometries and timing requirements, resolving the contradiction between fast curing and sufficient working time
2Reliability
If highly filled opaque/colored systems are used, then adhesion and durability are improved, but depth of cure and cure speed are reduced
Solution Approach 1:
The patent uses a light-emitting curing device with optimized wavelength parameters that can penetrate through highly filled opaque/colored systems more effectively. The specific wavelength range and intensity are tuned to achieve sufficient penetration depth while maintaining rapid cure kinetics, resolving the contradiction between adhesion performance and curability in pigmented systems
Solution Approach 2:
The composition employs a composite formulation combining the light-curable (meth)acrylate matrix with specifically selected adhesion promoters and photoinitiators that work synergistically. This composite approach enables the system to achieve both excellent adhesion to substrates and adequate cure depth even in highly filled opaque formulations
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 adhesion to metal surfaces, long shelf stability, temperature and moisture insensitivity, and rapid curing in seconds, enhancing productivity and flexibility in assembly geometries.
Implementation Method 1
initiator is a photoinitiator, particularly those having an extinction coefficient of from about 10 to about 2000 L/mol·cm at a wavelength from about 400 nm to about 500 nm
Implementation Method 2
having an extinction coefficient of from about 10 to about 2000 L/mol·cm at a wavelength from about 400 nm to about 500 nm
Data Source
AI summary
A curable composition is provided comprising a urethane (meth)acrylate oligomer, a urethane (urea) phosphonate adhesion promoter, optionally reactive diluents, and an initiator. The use of the urethane (urea) phosphonate adhesion promotor provides better ageing stability and adhesion, as measured by T-peel adhesion test, than the use of other conventional adhesion promotors.