Photosensitive Copolymer Resin for Low-Temperature Curing
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Solution Overview
Problem
Photosensitive resin compositions require improved low-temperature curability and solvent resistance to prevent insufficient curing and deterioration of solvent resistance, especially in applications involving poorly heat-resistant materials like organic EL.
Innovation Solution
A copolymer comprising structural units with acid groups, ethylenically unsaturated groups, hydroxy groups, and blocked isocyanate groups, along with a photosensitive resin composition containing a reactive diluent and photopolymerization initiator, to enhance developability and solvent resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If low-temperature curability is improved, then curability at low temperatures is enhanced, but solvent resistance deteriorates
Solution Approach 1:
The patent uses a copolymer comprising multiple structural units (including units with acid groups, ethylenically unsaturated groups, hydroxy groups, and blocked isocyanate groups) to create a resin composition that achieves both low-temperature curability and high solvent resistance. This composite approach allows the material to exhibit properties that neither single component could provide alone, resolving the contradiction between curability temperature and solvent resistance.
Solution Approach 2:
The patent modifies the chemical structure parameters of the resin by incorporating specific structural units with particular functional groups. By adjusting the composition and structure of the copolymer, the material achieves optimal curing behavior at low temperatures while maintaining excellent solvent resistance, thus resolving the trade-off between temperature and durability.
2Temperature
If low-temperature curability is improved, then curability at low temperatures is enhanced, but developability worsens
Solution Approach 1:
The copolymer structure combines multiple functional units that work synergistically: some units provide low-temperature curability while others ensure excellent developability. This composite molecular structure allows the resin to be easily developed while maintaining low-temperature curing capability, resolving the contradiction between temperature and ease of manufacture.
3Reliability
If high heat resistance is used, then solvent resistance is improved, but applicability to poorly heat-resistant members deteriorates
Solution Approach 1:
The patent changes the curing temperature parameter from high temperature to low temperature, allowing the resin to be applied to poorly heat-resistant members such as organic EL materials. The specific copolymer structure enables sufficient crosslinking and solvent resistance even at these lower temperatures, thus expanding adaptability to a broader range of substrates.
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 copolymer and resin composition provide improved developability and solvent resistance, ensuring effective curing and durability of resin films even at low temperatures, suitable for applications in color filters and image display elements.
Implementation Method 1
photosensitive resin compositions that can be cured by active energy rays, such as ultraviolet rays and electron beams
Data Source
AI summary
The copolymer has an acid group-bearing structural unit (a) and a structural unit (b) that has a group represented by formula (1-1) (In formula (1-1), R1 is a hydrogen atom or a hydrocarbon group having 1-20 carbon atoms; R2 and R3 are each independently a hydrogen atom or a hydrocarbon group having 1-20 carbon atoms; and * represents a linking site that links to a residue provided by the removal of the group with formula (1-1) from the structural unit (b).).