Epoxide Crosslinker System for Polyacrylate Thermal Curing
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Solution Overview
Problem
Current thermal crosslinking methods for polyacrylate hotmelts face challenges such as short processing life, non-homogeneous crosslinking, and the need for harsh conditions, particularly when using isocyanates or radiation-induced methods, which limit the thickness and uniformity of crosslinked layers in pressure-sensitive adhesive applications.
Innovation Solution
A crosslinker-accelerator system comprising substances with epoxide groups and accelerators, such as polyfunctional amines, is used to facilitate thermal crosslinking at temperatures below the melting point of polyacrylates, allowing for controlled and homogeneous crosslinking without the need for actinic radiation or high thermal energy, enabling longer processing times and uniform coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thermal crosslinking is performed using conventional methods (isocyanates or radiation-induced methods), then crosslinking speed and cohesion are improved, but processing life becomes too short and crosslinking uniformity deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the crosslinking system by using epoxide-based crosslinkers instead of conventional isocyanates or radiation methods. This parameter change enables crosslinking at lower temperatures and extends processing life while maintaining cohesion through the controlled reaction kinetics of the epoxide-accelerator system
Solution Approach 2:
The patent introduces accelerator substances as intermediaries that mediate between the epoxide crosslinker and the polyacrylate. These accelerators (such as amines or metal salts) enable the crosslinking reaction to proceed at controlled rates at lower temperatures, extending processing life while ensuring uniform crosslinking throughout the coating
2Productivity
If thermal crosslinking is performed using conventional methods, then crosslinking efficiency is improved, but crosslinking uniformity across the layer thickness deteriorates
Solution Approach 1:
The patent changes the thermal parameters by performing crosslinking at lower temperatures using epoxide-based systems. This allows heat to penetrate through the entire coating layer more uniformly, eliminating the gradient effect seen in conventional high-temperature methods and ensuring homogeneous crosslinking across the full thickness while maintaining efficient crosslinking rates through catalyst acceleration
3Ease of operation
If high molecular weight polyacrylates are used to improve coating properties, then coating suitability is improved, but crosslinking speed deteriorates
Solution Approach 1:
The patent introduces accelerator substances as intermediaries that specifically catalyze the crosslinking reaction between epoxide groups and polyacrylate functional groups. These accelerators (amines, metal salts) lower the activation energy of the crosslinking reaction, enabling fast crosslinking rates even with high molecular weight polyacrylates that have slower diffusion, thus maintaining both coating suitability and crosslinking speed
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
This approach provides a stable and controllable crosslinking process that extends processing life, ensures homogeneous crosslinking, and allows for high degrees of cohesion in polyacrylate compositions, even after cooling to room temperature, without the drawbacks of existing methods.
Implementation Method 1
thermal crosslinking of polyacrylates
Implementation Method 2
at least one substance which has an accelerator action for crosslinking reactions by means of compounds containing epoxide groups
Data Source
AI summary
Crosslinker/accelerator system for thermally crosslinking polyacrylates with functional groups that are adapted to react with epoxy groups in a crosslinking reaction, comprising at least one epoxy group-containing substance and at least one substance that accelerates the crosslinking reaction at a temperature below the melting temperature of the polyacrylate.