Low-Temperature Curable Polymer Formulations for Transparent Films
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current materials for microelectronic and optoelectronic devices face challenges in achieving low-temperature curing, planarization, and transparency while minimizing yellowing or darkening, as well as outgassing and electrical issues due to high curing temperatures and residual silanols in existing organic and inorganic polymer formulations.
Innovation Solution
Development of low-temperature thermally curable polymer formulations comprising hydroxy functional groups, acid sources, and acid-activated crosslinkers that react to form transparent films with excellent planarization, thermal stability, and low outgassing, suitable for both organic and inorganic polymers, using phenol-based and silanol-based polymers with specific crosslinkers like glycoluril, benzoguanamine, and melamine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If high curing temperatures (e.g., 275°C) are used to achieve solvent resistant films, then film transparency and planarization are improved, but yellowing or darkening of films occurs due to competing oxidation reactions
Solution Approach 1:
The invention changes the curing temperature parameter from high (275°C) to low (below 200°C) while maintaining solvent resistance through alternative crosslinking mechanisms using silane-based polymers and acid-activated crosslinkers, thereby avoiding oxidation-induced yellowing
Solution Approach 2:
The invention introduces acid-activated crosslinkers as intermediaries that enable crosslinking at low temperatures without requiring high thermal energy that would cause oxidation, thus achieving solvent resistance without yellowing
2Illumination intensity
If inorganic siloxane materials are used to achieve optical transparency, then film transparency is improved, but residual silanols remain due to partial crosslinking at temperatures below 300°C, causing outgassing, low electrical breakdown strength, and high leakage
Solution Approach 1:
The invention creates composite materials combining inorganic siloxane polymers with organic crosslinkers, achieving both optical transparency from the inorganic component and complete crosslinking (eliminating residual silanols) through the organic crosslinking mechanism, thereby improving electrical breakdown strength
Solution Approach 2:
The invention ensures continuous and complete crosslinking action through acid-activated crosslinkers that react thoroughly with silane groups, eliminating residual silanols that would otherwise cause outgassing and electrical failures
3Object-affected harmful factors
If low curing temperatures (below 200°C) are used to minimize yellowing, then film transparency is maintained, but complete crosslinking and solvent resistance are difficult to achieve
Solution Approach 1:
The invention changes the chemical mechanism of crosslinking from thermal condensation (requiring high temperature) to acid-catalyzed crosslinking (effective at low temperature), enabling complete crosslinking and solvent resistance below 200°C without yellowing
Solution Approach 2:
The invention uses acid sources as intermediaries to catalyze the crosslinking reaction at low temperatures, enabling complete crosslinking and solvent resistance without requiring high thermal energy that would cause yellowing
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
These formulations enable the production of transparent films with high transmittance, thermal stability, and improved electrical properties, suitable for flexible displays, MEMS devices, and other applications, by curing at temperatures of 200°C or less, maintaining optical clarity and mechanical properties.
Implementation Method 1
at least one acid-activated crosslinker that reacts with the polymer
Implementation Method 2
low-temperature thermally curable polymer formulations
Data Source
AI summary
Polymer formulations are disclosed and described herein that comprise: at least one polymer comprising at least one hydroxy functional group, at least one acid source, and at least one acid-activated crosslinker that reacts with the polymer. In contemplated embodiments, these polymer formulations are curable at relatively low temperatures, as compared to those polymer formulations not comprising contemplated crosslinkers. Transparent films formed from these contemplated formulations are also disclosed. Organic transparent film compositions are also disclosed that comprise: at least one at least one phenol-based polymer, at least one solvent; at least one acid-activated crosslinker; and at least one acid source. Methods of forming organic transparent films with improved transmittance by depositing on a substrate the formulations disclosed herein and curing the formulations or compositions at a temperature of less than about 200° C. Inorganic transparent film compositions are disclosed that include: at least one silanol-based polymer, at least one solvent; at least one acid-activated crosslinker; and at least one acid source. Methods of forming inorganic transparent films are disclosed by depositing on a substrate the formulations disclosed herein and curing the formulations or compositions at a temperature of 200° C. or less.