Polymerizable Composition UV Shielding via Segmented Absorption
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Solution Overview
Problem
Current ultraviolet absorbing agents degrade over time due to light exposure, particularly those with maximum absorption wavelengths on the longer wavelength side, leading to poor light resistance and reduced shielding effectiveness against ultraviolet rays around 400 nm.
Innovation Solution
A polymerizable composition comprising a compound with a maximum absorption wavelength in the range of 300 to 380 nm and an ultraviolet absorbing agent with a shorter maximum absorption wavelength, combined with a polymerization initiator, to produce a polymer with enhanced shielding properties and light resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an ultraviolet absorbing agent with a maximum absorption wavelength on the longer wavelength side (around 400 nm) is used to enhance shielding effectiveness, then the shielding ability against ultraviolet rays is improved, but the light resistance deteriorates and the absorption ability degrades with time
Solution Approach 1:
The ultraviolet absorption function is divided between two components: a compound of Formula (1) that absorbs longer wavelength ultraviolet rays (380-400 nm) and an ultraviolet absorbing agent A that absorbs shorter wavelength ultraviolet rays. This segmentation allows each component to operate in its optimal wavelength range, preventing the degradation issue that occurs when a single agent tries to absorb across the entire spectrum.
Solution Approach 2:
The invention changes the absorption wavelength parameter distribution by selecting an ultraviolet absorbing agent A whose maximum absorption wavelength is shorter than that of the compound of Formula (1). This parameter optimization ensures that the compound of Formula (1) operates at its peak efficiency without competing with the absorbing agent A for the same wavelength range, thereby maintaining both high shielding effectiveness and excellent light resistance.
2Device complexity
If a single ultraviolet absorbing agent is used to simplify the composition, then the device complexity is reduced, but the shielding effectiveness against long wavelength ultraviolet rays (around 400 nm) is insufficient
Solution Approach 1:
The compound of Formula (1) serves multiple functions: it acts as both the primary ultraviolet absorbing component for longer wavelengths and as a polymerizable compound that forms the structural basis of the cured product. The ultraviolet absorbing agent A complements this by providing additional absorption capacity at shorter wavelengths. This multi-functionality approach achieves comprehensive ultraviolet shielding without requiring a complex mixture of multiple specialized additives.
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 effectively shields against ultraviolet rays in the 400 nm range with improved light resistance, preventing degradation and maintaining absorption capability over time.
Implementation Method 1
a compound represented by Formula (1) and an ultraviolet absorbing agent A having a maximum absorption wavelength on a shorter wavelength side than a maximum absorption wavelength of the compound represented by Formula (1)
Implementation Method 2
polymerizable composition comprising: a compound represented by Formula (1); and an ultraviolet absorbing agent A
Data Source
AI summary
Provided is a polymerizable composition including a compound represented by Formula (1), and an ultraviolet absorbing agent A having a maximum absorption wavelength on a shorter wavelength side than a maximum absorption wavelength of the compound represented by Formula (1). Provided are a polymer, an ultraviolet shielding material, a laminate, a compound, an ultraviolet absorbing agent, and a method of producing a compound. In Formula (1), R1 to R6 each independently represent a hydrogen atom or a substituent, where at least one of R1 to R6 represents a group that contains a polymerizable group having an ethylenically unsaturated bond.