UV-Curable Resin Composition for Deep and Shadowed Area Curing
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Solution Overview
Problem
Existing ultraviolet-curable resin compositions face challenges in achieving sufficient curing in light shielding portions and deep parts, where ultraviolet rays cannot reach effectively.
Innovation Solution
A novel ultraviolet-curable resin composition comprising at least one polymer from poly(meth)acrylates or polyvinyl ethers, a compound with secondary thiol groups, a specific photopolymerization initiator, and an organic compound that emits light upon absorbing ultraviolet rays, ensuring adequate curing in shadowed or deep areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ultraviolet-curable resin compositions are used, then curing proceeds well in exposed areas, but curing is insufficient in light shielding portions and deep parts where ultraviolet rays cannot reach
Solution Approach 1:
The patent introduces a light-emitting compound as an intermediary substance that absorbs ultraviolet light and re-emits it at a longer wavelength. This emitted light then penetrates the resin composition to enable curing in deep portions and shadow areas, effectively mediating between the UV light source and the polymerizable compounds in hard-to-reach areas.
Solution Approach 2:
The patent changes the wavelength parameter of the curing light by using a light-emitting compound that converts UV light to visible light with a longer wavelength. This parameter change allows the light to penetrate deeper into the resin composition and reach areas that UV light alone cannot effectively cure.
2Reliability
If heat curing or moisture curing is combined with ultraviolet curing to cure light shielding portions, then curing completeness improves, but deformation and adhesion reduction occur due to heat, and moisture curing takes excessive time
Solution Approach 1:
The patent replaces thermal curing and moisture curing mechanisms with a photonic mechanism. By using a light-emitting compound that emits visible light upon UV irradiation, the system achieves curing through light energy rather than heat or moisture, thereby avoiding the deformation and adhesion problems associated with thermal curing and the time delays of moisture curing.
3Volume of moving object
If a thick coating film or deep molded article is obtained, then the functional performance improves, but ultraviolet rays cannot sufficiently reach deep parts resulting in insufficient curing
Solution Approach 1:
The light-emitting compound acts as a mediator that enables UV light to effectively cure thick coating films and deep molded articles. The compound absorbs UV light and re-emits it at a longer wavelength that has better penetration depth, allowing complete curing throughout the entire thickness of the coating or mold.
Solution Approach 2:
The patent introduces an additional optical dimension by using a light-emitting compound that converts UV wavelength to visible wavelength. This dimensional change in the electromagnetic spectrum allows the light to penetrate deeper into the material, enabling curing of thick sections that would be inaccessible to UV light alone.
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 ensures complete curing in light shielding portions and deep parts, even when using UV-LED light sources, making it suitable for applications requiring strong adhesion and insulation, such as electronic circuit boards and optical lens units.
Implementation Method 1
on being irradiated with ultraviolet rays, photopolymerization initiators generate active radicals
Implementation Method 2
an organic compound that emits light by absorbing prescribed ultraviolet rays
Data Source
AI summary
One ultraviolet-curable resin composition of the present invention includes: (A) at least one polymer selected from the group consisting of poly(meth)acrylates (a1) and polyvinyl ethers (a2); (B) a compound having at least two secondary thiol groups in a molecule thereof; (C) a photopolymerization initiator a solution of which in acetonitrile with a concentration of 500 ppm has an absorbance of 0.50 or more in an optical path length of 10 mm at 385 nm; and (D) an organic compound that emits light upon absorbing ultraviolet rays, having a maximum wavelength of an absorption spectrum in a range of 300 nm or more and 450 nm or less, and having a maximum wavelength of an emission spectrum in a range of 350 nm or more and 500 nm or less; wherein a content of the compound (B) is 10 mass % or more and 70 mass % or less based on 100 mass % of the resin composition in terms of solid content.