Polysiloxane Resin Composition for High Refractive Index Imprinting
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Solution Overview
Problem
Current resin compositions for imprinting lack effective solutions for achieving high refractive index and low haze while maintaining good imprint properties, particularly in UV imprinting processes, as existing compositions either have low silica content or inadequate evaluation of imprint properties.
Innovation Solution
A resin composition containing a polysiloxane resin and a fine particulate inorganic oxide, with a specific weight ratio of 0.2 to 2.5, which includes a polysiloxane resin represented by a specific formula and a fine particulate inorganic oxide like zirconium or titanium oxide, enhancing both imprint and optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the amount of aromatic ring-containing compounds or highly refractive inorganic materials is increased to increase the refractive index, then the refractive index is improved, but the viscosity becomes unsuitable for UV imprinting process
Solution Approach 1:
The patent changes the particle size parameter of the inorganic oxide from conventional larger sizes to fine particles with average particle size of 10 nm to 70 nm. This parameter change allows achieving high refractive index (1.65-1.95) while maintaining suitable viscosity (10-1000 cP) for UV imprinting processes, resolving the contradiction between refractive index improvement and viscosity control.
Solution Approach 2:
The patent creates a composite material system combining polysiloxane resin with fine particulate inorganic oxide (zirconium oxide, titanium oxide, or silicon oxide). This composite approach enables the formulation to achieve both high refractive index through the inorganic oxide content and appropriate processing viscosity through the polysiloxane matrix, simultaneously satisfying optical performance and processability requirements.
2Illumination intensity
If the silica content is increased to improve optical properties, then the refractive index is improved, but the imprint properties deteriorate
Solution Approach 1:
The patent optimizes the particle size parameter of inorganic oxide to 10-70 nm range, which is significantly finer than conventional silica particles. This fine particle size allows the inorganic oxide to be uniformly dispersed in the polysiloxane matrix, improving refractive index while maintaining good imprint properties through proper dispersion and interaction with the resin matrix.
Solution Approach 2:
The patent uses different types of inorganic oxides (zirconium oxide, titanium oxide, silicon oxide) with different local properties to achieve the desired refractive index. By selecting specific oxide types and controlling their distribution at the nanoscale level within the polysiloxane matrix, the formulation achieves high refractive index without compromising imprint properties.
3Ease of operation
If conventional resin compositions are used, then the processability is maintained, but the optical properties (high refractive index and low haze) cannot be achieved
Solution Approach 1:
The patent formulates a composite material consisting of polysiloxane resin combined with fine particulate inorganic oxide (10-70 nm). This composite structure maintains the processability of the polysiloxane matrix while the dispersed inorganic oxide particles provide high refractive index (1.65-1.95) and low haze, achieving both good processability and superior optical properties.
Solution Approach 2:
The patent changes the particle size parameter of inorganic oxide to the fine range of 10-70 nm, which fundamentally alters the material properties. This parameter change enables the formulation to achieve high refractive index and low haze while maintaining suitable viscosity and processability for UV imprinting, overcoming the limitations of conventional resin compositions.
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 achieves excellent imprint properties and optical properties, including high refractive index and low haze, suitable for optical elements, by optimizing the ratio of polysiloxane resin to fine particulate inorganic oxide, thereby addressing the limitations of previous compositions.
Implementation Method 1
This literature, however, uses an acrylic resin and silica and examines only compositions also having a low silica content in the examples... no composition has been developed which has a viscosity applicable to a UV imprinting process and which provides a cured product having good optical properties
Implementation Method 2
R1, R2, and R3 are each independently a hydrogen atom, a hydroxy group, an alkoxy group, a C1-C12 hydrocarbon group, or a C1-C12 substituent having one or more crosslinkable functional groups
Data Source
AI summary
Provided is a resin composition for imprinting excellent in imprint properties and optical properties such as high refractive index and low haze. The invention relates to a resin composition for imprinting containing: (A) a polysiloxane resin represented by the following formula (1): (R1SiO3/2)a(R22SiO2/2)b(R33SiO1/2)c(SiO4/2)d wherein R1, R2, and R3 are each independently a hydrogen atom, a hydroxy group, an alkoxy group, a C1-C12 hydrocarbon group, or a C1-C12 substituent having one or more crosslinkable functional groups, with at least one of R1, R2, or R3 being a C1-C12 substituent having one or more crosslinkable functional groups, and when a plurality of R1s, R2s, or R3s are present, they may be different from one another; and a, b, c, and d are numbers satisfying the following conditions: 0.001≤a≤1.00, 0≤b≤0.999, 0≤c≤0.30, 0≤d≤0.30, and a+b+c+d=1.0; and (B) a fine particulate inorganic oxide, wherein the ratio by weight of the sum of the polysiloxane resin (A) and optionally an alkoxysilane compound and a curable resin to the fine particulate inorganic oxide (B) is 0.2 to 2.5.