Polymer Compound for Organic EL Inkjet Printing
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Solution Overview
Problem
Existing polymer compounds used in organic electroluminescence elements have insufficient dissolution rates in solvents, hindering efficient production of organic layers through coating methods like ink jet printing.
Innovation Solution
A polymer compound comprising constitutional units represented by specific formulas, with a tap density between 0.02 and 0.13 g/cm³, and a glass transition temperature between 80°C and 200°C, is developed, along with a production method involving mixing with a good solvent and a poor solvent to enhance solubility and molecular weight distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional polymer compounds are used for coating methods, then the organic layer can be formed, but the dissolution rate in solvent is insufficient
Solution Approach 1:
The patent modifies the molecular structure parameters of the polymer compound by introducing specific constitutional units with formula (1-1) and (1-2), controlling the tap density to 0.02 g/cm³ or less, and adjusting the glass transition temperature to 80°C or higher. These parameter changes enable the polymer to achieve high dissolution rates in solvents while maintaining the required functional properties for organic electroluminescence elements.
2Ease of manufacture
If polymer compound with high dissolution rate is developed, then efficient ink jet printing is enabled, but the molecular weight distribution becomes broader
Solution Approach 1:
The patent creates a composite polymer structure containing multiple constitutional units defined by formulas (1-1) and (1-2), where each unit contributes different properties. This composite approach allows the polymer to achieve both high dissolution rate (facilitating ink preparation) and controlled molecular weight distribution through the synergistic combination of different structural units with specific functional groups and molecular weight characteristics.
Data Source
AI summary
To provide a polymer compound having high dissolution rate in a solvent and a method of producing the polymer compound. A polymer compound containing at least constitutional unit selected from the group consisting of a constitutional unit represented by the formula (1-1) and a constitutional unit represented by the formula (1-2). A method of producing a polymer compound containing at least one constitutional unit selected from the group consisting of a constitutional unit represented by the formula (1-1) and a constitutional unit represented by the formula (1-2), comprising a step of mixing a mixture containing a polymer compound containing at least one constitutional unit selected from the group consisting of a constitutional unit represented by the formula (1-1) and a constitutional unit represented by the formula (1-2) and a good solvent for the above-described polymer compound with a poor solvent of 35°C or higher and 75°C or lower for the above-described polymer compound and removing the resultant precipitate: