Two-Part Curable Compositions for Temperature-Stable Storage Modulus
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Solution Overview
Problem
Existing curable compositions face challenges in achieving a storage modulus with little temperature dependence, good thermal conductivity, and reliable performance over a wide temperature range, particularly in electronics applications.
Innovation Solution
A two-part curable composition comprising Part A with polythiol and tertiary amine accelerator, and Part B with polyene and organic peroxide curative, where the polythiol and polyene are reaction products of specific components, including HSR1O(CH2CHR2O)aR1SH, CH2═CHOR1O(CH2CHR2O)aR1OCH═CH2, and triallyl isocyanurate, to enhance chemical crosslinking and thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional curable compositions are used, then basic sealing and adhesion functions are achieved, but the storage modulus shows significant temperature dependence and thermal conductivity is insufficient
Solution Approach 1:
The patent modifies the chemical composition parameters by using polythiol with specific thiol group functionality (at least two) and polyene with specific unsaturation (at least two non-aromatic C=C double bonds or C≡C triple bonds), along with tertiary amine accelerator and organic peroxide curative, to achieve a storage modulus with minimal temperature dependence while maintaining reliable performance across -30°C to 60°C
Solution Approach 2:
The invention creates a composite curable composition system combining Part A (polythiol + tertiary amine accelerator) and Part B (polyene + organic peroxide curative) that, when mixed, produce a cured material with superior temperature-stable mechanical properties and thermal conductivity for electronics applications
2Reliability
If the composition is designed for good thermal conductivity, then heat dissipation performance improves, but the complexity of the composition system increases
Solution Approach 1:
The curable composition system serves multiple functions simultaneously: it provides sealing, adhesion, thermal conductivity for heat dissipation, and vibration damping, all within a single two-part composition system that cures to form a multi-functional material suitable for electronics applications
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 exhibits a storage modulus with little temperature dependence and good thermal conductivity, providing reliable performance and toughness for electronics applications.
Implementation Method 1
The two separate parts of two-part compositions are commonly referred to in the art as Part A and Part B... at least partially cured to provide a usable end product... when mixed, begin to cure
Implementation Method 2
organic peroxide curative... initiate polymerization and crosslinking
Implementation Method 3
tertiary amine accelerator... enhance chemical crosslinking
Data Source
AI summary
A two-part curable composition comprises: a Part A component comprising polythiol having a thiol group functionality of at least two, and tertiary amine accelerator; and a Part B component comprising polyene comprising at least two of non-aromatic C—C double bonds, C—C triple bonds, or a combination thereof and organic peroxide curative. At least one of the polythiol or the polyene comprises a respective reaction product of reaction components comprising: HSR1O(CH2CHR2O)aR1SH wherein each R1 independently represents an alkyl group having from 2 to 12 carbon atoms, each R2 independently represents H or CH3, and a represents an integer from 1 to 20; triallyl isocyanurate; H2═CHOR1O(CH2CHR2O)aR1OCH═CH2; and. A method of making a curable composition comprises combining the Part A and Part B components of the two-part curable composition. Methods of sealing a substrate and adhering two substrates, and articles made thereby are also disclosed. (Formula AA).