Siloxane Monomer with Phenyl Group for Silicone Hydrogel Lens Mold Release

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Solution Overview

Problem

Silicone hydrogel lenses face difficulties in releasing from molds due to their physical properties, such as flexibility and surface stickiness, and existing methods using solvents pose safety hazards and complicate the process, while methods like PEG mixing can affect lens properties.

Innovation Solution

Incorporating an aromatic structure, such as a phenyl group, into the silicone raw material of the siloxane monomer to enhance the releasability of silicone hydrogel lenses from mold components without compromising water content and oxygen permeability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If aqueous solution is used to release the lens from the mold, then the release process is simple and safe, but it is not effective for silicone hydrogel lenses containing large amount of hydrophobic silicone

Engineering Contradiction:

Improvesafety hazards of organic solventVSAvoidrelease effectiveness

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent changes the chemical composition parameters of the lens material by incorporating aromatic structures (phenyl groups) into the siloxane monomer. This parameter change modifies the surface properties and adhesion characteristics of the cured lens, enabling effective release from the mold using safe aqueous solutions instead of requiring harmful organic solvents.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If organic solvent is used to accelerate the release process, then the release effectiveness is improved, but safety hazards and production line shutdown risks increase

Engineering Contradiction:

Improverelease effectivenessVSAvoidsafety hazards of organic solvent

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent modifies the chemical parameters of the lens material by introducing aromatic structures into the siloxane monomer composition. This parameter change fundamentally alters the adhesion properties of the cured lens, allowing safe and effective release using aqueous solutions, thereby eliminating the need for hazardous organic solvents and associated safety risks.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If PEG is mixed into the lens composition to accelerate release, then the release speed is improved, but the process becomes complicated and lens physical properties may be affected

Engineering Contradiction:

Improverelease speedVSAvoidprocess complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent changes the fundamental chemical parameters of the lens material by incorporating aromatic structures into the siloxane monomer. This parameter change inherently improves release speed without requiring additional additives like PEG, thereby simplifying the manufacturing process while maintaining lens physical properties.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent extracts the need for additional release-accelerating additives by fundamentally modifying the lens material composition. By incorporating aromatic structures into the siloxane monomer, the release function is built into the base material itself, eliminating the need to add separate components like PEG and their associated process complexities.

Inventive Principle:

Principle #2Taking out (Extraction)

4Reliability

If silicone raw material with improved flexibility and surface stickiness is used, then the releasability from mold is fundamentally improved, but the composition complexity increases

Engineering Contradiction:

ImprovereleasabilityVSAvoidcomposition complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent changes the chemical structure parameters of the siloxane monomer by incorporating aromatic structures (phenyl groups). This parameter change simultaneously improves releasability by modifying surface properties and flexibility, while maintaining relatively simple composition by integrating these properties into the base monomer structure rather than adding multiple separate components.

Inventive Principle:

Principle #35Parameter changes

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 modified siloxane monomer improves the separation yield and simplifies the release process, ensuring excellent releasability while maintaining the water content and oxygen permeability comparable to existing silicone hydrogel lenses.

Implementation Method 1

a siloxane monomer represented by Chemical Formula 1 and used in preparation of a silicone hydrogel lens which is easy to release from a component of a mold

Methodology Applied

Scientific EffectAromatic structure incorporation:

Data Source

PatentUS10807999B2Siloxane monomer, composition for preparation of silicone hydrogel lens containing same, and silicone hydrogel lens

Publication Date: 2020.10.20 INTEROJO

AI summary

The present invention relates to a siloxane monomer used in the production of a silicone hydrogel lens, a composition for the preparation of a lens containing the same, and a silicone hydrogel lens prepared from the same, wherein the silicone hydrogel lens according to the present invention has a feature of easy release from a component of a mold.