Surface-Modified Metal Oxide Particles for High Abbe Number Optical Resins
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Solution Overview
Problem
The surface-modified metal oxide particles in existing curable compositions have low compatibility with fluorinated compounds due to a high proportion of surface-modifying groups derived from non-fluorinated components, leading to poor dispersion and reduced transparency of the cured products when attempting to increase the fluorine atom content for higher Abbe numbers.
Innovation Solution
Surface-modified metal oxide particles with fluoroalkyl and (meth)acryloyl group-containing surface-modifying groups are developed, allowing for improved dispersion in high fluorine atom content liquids, comprising specific chemical formulas and proportions of surface-modifying groups to enhance compatibility and transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the proportion of fluorinated compound in the second polymerizable component is increased to increase the Abbe number, then the Abbe number of the cured product is improved, but the surface-modified metal oxide particles cannot be uniformly dispersed, thus lowering the transparency
Solution Approach 1:
The invention changes the chemical composition parameters of the surface-modifying groups by introducing fluorinated compounds with specific molecular structures (formulae A1 and A2) containing both fluoroalkyl groups and (meth)acryloyl groups. This parameter change enables the surface-modified metal oxide particles to maintain compatibility with high fluorine atom content liquids while achieving uniform dispersion, thus resolving the contradiction between increasing Abbe number and maintaining transparency.
Solution Approach 2:
The invention creates a composite surface-modifying group structure combining fluoroalkyl groups (from fluorinated compounds) and (meth)acryloyl groups (from polymerizable components) on the metal oxide particle surface. This composite structure provides both high fluorine atom content for high Abbe number and compatibility with the liquid fluorinated compound for uniform dispersion and high transparency.
2Manufacturing precision
If the fluorine atom content in the surface-modifying groups is increased to increase the Abbe number, then the Abbe number is improved, but the compatibility with the fluorinated compound deteriorates, leading to poor dispersion
Solution Approach 1:
The invention applies local quality by introducing fluorinated surface-modifying groups specifically on the surface of metal oxide particles, while maintaining (meth)acryloyl groups that provide compatibility with the liquid fluorinated compound. This localized modification ensures high fluorine atom content for high Abbe number while preserving compatibility for uniform dispersion.
Solution Approach 2:
The surface-modifying groups act as an intermediary between the metal oxide particles and the liquid fluorinated compound. By incorporating both fluoroalkyl groups (providing fluorine atom content) and (meth)acryloyl groups (providing compatibility), the surface-modifying groups mediate the interaction between particles and liquid, enabling uniform dispersion while achieving high Abbe number.
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 surface-modified metal oxide particles achieve high Abbe numbers and excellent transparency in cured products, enabling effective optical applications while maintaining mechanical properties.
Implementation Method 1
surface-modified metal oxide particles having fluoroalkyl group-containing surface-modifying groups and (meth)acryloyl group-containing surface-modifying groups on their surface, which are readily dispersed in a liquid fluorinated compound
Implementation Method 2
a curable composition from which a cured product having a high Abbe number and being excellent in transparency can be obtained
Data Source
AI summary
Surface-modified metal oxide particles, includes: a metal oxide particle having a refractive index of at least 1.9 to light having a wavelength of 589 nm; a first surface-modifying group having a group represented by formula (A1); and a second surface-modifying group having a group represented by formula (A2). R1 is a hydrogen atom or a C1-4 hydrocarbon group; n is an integer of from 1 to 20, m is an integer of at least 3 and at most (2n+1); a is an integer of from 0 to 2; R3 is a hydrogen atom or a methyl group; R4 is a hydrogen atom or a C1-4 hydrocarbon group; X is —O— or —NH—; b is an integer of from 2 to 10; and c is an integer of from 0 to 2.CnFmH2n+1-m—SiR1a(—*)3-a (A1)CH2═CR3C(O)—X—(CH2)b—SiR4c(—*)3-c (A2)