Polymerizable Composition Particle Size Control via Solvent Evaporation

Solution Overview

Problem

The appearance of cured dental polymerizable compositions, such as composite resins, is deteriorated due to difficulties in controlling the particle size of solid monomers when directly mixed with liquid monomers, leading to suboptimal performance and antibacterial properties in the final product.

Innovation Solution

A method involving dissolving a solid second polymerizable monomer or its polymer in a solvent with a liquid first polymerizable monomer, followed by solvent evaporation, to control particle size and improve the appearance and antibacterial properties of the cured product.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If solid second polymerizable monomer is directly mixed with liquid first polymerizable monomer, then antibacterial properties are imparted to the cured product, but particle size control becomes difficult and appearance is deteriorated

Engineering Contradiction:

Improveantibacterial propertiesVSAvoidparticle size control

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The solid second polymerizable monomer is preliminarily dissolved in a solvent before being mixed with the liquid first polymerizable monomer. This preliminary dissolution action enables precise control of particle size during subsequent processing while maintaining the antibacterial properties of the solid monomer in the final cured product.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

A solvent is introduced as an intermediary substance to facilitate the uniform dispersion of the solid second polymerizable monomer in the liquid first polymerizable monomer. The solvent acts as a medium that enables controlled particle size formation, which is then removed or retained depending on the desired final properties.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If solid second polymerizable monomer is directly mixed with liquid first polymerizable monomer, then antibacterial properties are achieved, but appearance of cured product is deteriorated

Engineering Contradiction:

Improveantibacterial propertiesVSAvoidappearance

Core Design Contradiction:

ReliabilityVSShape

Solution Approach 1:

The solid second polymerizable monomer is preliminarily dissolved in a solvent before being mixed with the liquid first polymerizable monomer. This preliminary dissolution action enables precise control of particle size during subsequent processing while maintaining the antibacterial properties of the solid monomer in the final cured product.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention creates local quality differences by controlling the distribution and particle size of the solid second polymerizable monomer throughout the composition. By achieving uniform local dispersion through solvent-mediated processing, the overall appearance of the cured product is improved while maintaining antibacterial functionality.

Inventive Principle:

Principle #3Local quality

3Manufacturing precision

If solvent is used to dissolve monomers, then particle size control and appearance are improved, but additional processing step is required

Engineering Contradiction:

Improveparticle size controlVSAvoidprocessing steps

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

A solvent is introduced as an intermediary substance to facilitate the uniform dispersion of the solid second polymerizable monomer in the liquid first polymerizable monomer. The solvent acts as a medium that enables controlled particle size formation, which is then removed or retained depending on the desired final properties.

Inventive Principle:

Principle #24Intermediary (Mediator)

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

This method enhances the appearance and imparts antibacterial properties to the cured dental polymerizable compositions by effectively dispersing the second polymerizable monomer, ensuring improved performance and surface uniformity.

Implementation Method 1

dissolving the first polymerizable monomer; the second polymerizable monomer, the polymer of the second polymerizable monomer, or the both in a solvent to obtain a solution

Methodology Applied

Scientific EffectDissolution: Solvation

Implementation Method 2

evaporating the solvent from the solution in a second step

Methodology Applied

Scientific EffectEvaporation: Evaporation

Data Source

PatentUS12077615B2Method of producing polymerizable composition and polymerizable composition

Publication Date: 2024.09.03 GC CORP

AI summary

There is provided a method of producing a polymerizable composition that includes a first polymerizable monomer; and a second polymerizable monomer, a polymer of the second polymerizable monomer, or both, the second polymerizable monomer, the polymer of the second polymerizable monomer, or the both being dispersed in the first polymerizable monomer, the method of producing a polymerizable composition includes dissolving the first polymerizable monomer; the second polymerizable monomer, the polymer of the second polymerizable monomer, or the both in a solvent to obtain a solution in a first step; and evaporating the solvent from the solution in a second step, wherein the first polymerizable monomer is a liquid, and wherein the second polymerizable monomer is a solid.