Two-Part Curable Compositions Using Alternative Cure Accelerators
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Solution Overview
Problem
There is a need for alternative cure accelerators in two-part curable compositions to address supply shortages and regulatory scrutiny of conventional curatives, while maintaining or improving adhesive properties.
Innovation Solution
The use of specific oxidants such as cumene hydroperoxide and benzoyl peroxide, combined with (meth)acrylate components, as cure accelerators in a two-part curable composition, which allows for reduced levels or elimination of conventional accelerators like toluidines, and provides enhanced adhesive properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional curatives are used in two-part curable compositions, then adhesive properties are achieved, but supply shortages and regulatory scrutiny occur
Solution Approach 1:
The patent changes the chemical parameters of the cure accelerator by using compounds of structure I with specific substituents (A, R, R', R'', EWG) instead of conventional curatives. This chemical parameter change enables compliance with regulatory requirements while maintaining supply assurance through alternative raw materials.
Solution Approach 2:
The patent employs readily available compounds of structure I that can be easily synthesized from common starting materials, replacing conventional curatives that face supply constraints. These alternative curatives are based on easily obtainable chemicals like tetrahydroquinoline and indoline derivatives.
2Productivity
If conventional accelerators like toluidines are used, then cure acceleration is achieved, but adhesive properties may be compromised due to reduced levels
Solution Approach 1:
The patent modifies the chemical structure of cure accelerators by introducing compounds of structure I with specific functional groups and substituents. These structural parameter changes enable the accelerators to maintain effective cure rates while achieving comparable or superior adhesive properties compared to conventional toluidine-based accelerators.
3Reliability
If alternative curatives are identified to replace conventional ones, then supply assurance and regulatory compliance are achieved, but new materials must be developed
Solution Approach 1:
The patent segments the cure accelerator molecule into distinct functional components: a core structure (tetrahydroquinoline or indoline), substituent groups (A, R, R', R'', EWG), and reactive functional groups. This segmentation allows systematic development and optimization of alternative curatives based on known chemical frameworks, simplifying the material development process.
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 proposed solution achieves comparable or superior ultimate adhesive properties to conventional two-part curable compositions, with reduced levels of conventional accelerators, ensuring supply assurance and regulatory compliance.
Implementation Method 1
1-5% by weight based on the total weight of the composition of an oxidant selected from cumene hydroperoxide; para-menthane hydroperoxide; t-amyl hydroperoxide; 1,1,3,3-tetramethylbutyl hydroperoxide; t-butyl hydroperoxide; t-butyl perbenzoate; benzoyl peroxide; dibenzoyl peroxide
Data Source
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AI summary
Two part curable compositions are provided, which include a cure accelerator defined with reference to compounds shown in structure (I), where A is CH2 or benzyl, R is C1-10 alkyl, R' is H or C1-10 alkyl, or R and R' taken together may form a four to seven membered ring fused to the benzene ring, R" is optional, but when R" is present, R" is halogen, alkyl, alkenyl, cycloalkyl, hydroxyalkyl, hydroxyalkenyl, alkoxy, amino, alkylene- or alkenylene-ether, alkylene (meth)acrylate, carbonyl, carboxyl, nitroso, sulfonate, hydroxyl or haloalkyl, and EWG is as shown, an electron withdrawing group, such as nitro, nitrile, carboxylate or trihaloalkyl.