Polymetalloxane Composition for High Refractive Index Films
Solution Overview
Problem
Existing methods for forming high refractive index films using polymetalloxanes face challenges such as aggregation during hydrolysis, leading to precipitation and crack formation, and the use of expensive stabilizing groups like trialkylsilanol, making it difficult to achieve stable and homogeneous films industrially.
Innovation Solution
A polymetalloxane composition with specific constituent units represented by general formulas, including R2R3N(O)a groups, which stabilizes the polymetalloxane in solution and allows for high molecular weight formation, preventing aggregation and enabling the production of crack-resistant, high refractive index films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If metal alkoxide is hydrolyzed to form polymetalloxane, then high refractive index film can be obtained, but hydrolysate aggregates and precipitates making homogeneous film formation difficult
Solution Approach 1:
The patent uses a specific solvent system (carboxylic acid solvent mixed with alcohol solvent) as an intermediary medium to prevent aggregation of metal hydroxide during hydrolysis. The carboxylic acid solvent acts as a mediator that stabilizes the hydrolysis process and prevents precipitation, enabling formation of homogeneous polymetalloxane solution that can produce uniform high-refractive-index films.
Solution Approach 2:
The patent controls the hydrolysis process by carefully managing water addition rate and temperature (maintaining 60-80°C), and by controlling the molar ratio of water to metal alkoxide (0.5-2.0). These parameter changes prevent aggregation while enabling complete hydrolysis, resolving the contradiction between achieving high refractive index and maintaining solution uniformity.
2Stability of the object's composition
If hydrolysis is carried out at low temperature or with excessive water, then aggregation and precipitation occur, but high temperature or controlled water addition reduces aggregation
Solution Approach 1:
The patent optimizes hydrolysis parameters by maintaining temperature at 60-80°C and controlling water addition rate to keep molar ratio of water to metal alkoxide between 0.5-2.0. These parameter changes enable complete hydrolysis without aggregation, achieving both solution stability and high hydrolysis rate simultaneously.
Solution Approach 2:
The patent employs continuous slow addition of water during hydrolysis rather than bulk addition. This continuous controlled hydrolysis process prevents local supersaturation and aggregation while ensuring complete reaction, maintaining both solution stability and high productivity throughout the process.
3Stability of the object's composition
If trialkylsilanol is used as stabilizing group, then polymetalloxane can exist stably in solution, but production cost increases significantly
Solution Approach 1:
The patent replaces expensive trialkylsilanol stabilizing groups with a cost-effective solvent system (carboxylic acid + alcohol). This substitution uses inexpensive, readily available chemicals to achieve the same stabilizing effect, dramatically reducing production cost while maintaining solution stability and enabling industrial-scale manufacture.
Solution Approach 2:
The patent changes the stabilization approach from chemical modification (adding trialkylsilanol groups) to process control (using specific solvent system with controlled hydrolysis parameters). This parameter change eliminates the need for expensive additives while achieving stable polymetalloxane solution through optimized hydrolysis conditions.
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 polymetalloxane composition enables the formation of stable, high-molecular-weight polymetalloxanes that can be industrially supplied, resulting in homogeneous cured films with improved refractive index and crack resistance.
Implementation Method 1
a method comprising applying a solution of polymetalloxane having a metal-oxygen-metal atom binding in its backbone and curing it to obtain a high refractive index thin film. Such a polymetalloxane can be obtained by hydrolysis of a metal alkoxide followed by polycondensation of the hydrolysate.
Data Source
AI summary
In one aspect of the present invention, a polymetalloxane has a constituent unit represented by the following general formula (1): wherein, R1 is a hydrogen atom or an alkyl group having 1 to 10 carbon atoms; R2 and R3 are each independently a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, an alicyclic alkyl group having 5 to 12 carbon atoms, an aromatic group having 6 to 30 carbon atoms, or an acyl group having 1 to 12 carbon atoms; R2 and R3 are optionally linked together via a carbon-carbon saturated or a carbon-carbon unsaturated bond to form a ring structure; a is an integer of 0 or 1; M represents a metal atom selected from the group consisting of Al, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Zr, Nb, Mo, Ru, Rh, Pd, Ag, In, Sn, Sb, Hf, Ta, W, Re, Os, Ir, Pt, Au, Tl, and Bi; m is an integer indicating the valence of the metal atom M; and b is an integer of 1 to (m-2).