Betaine Organosilicon Coating for Water-Resistant Antifogging

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Solution Overview

Problem

Existing coating compositions with organosilicon compounds do not provide sufficient water resistance and hydrophilicity, leading to deterioration of antifogging properties when exposed to water.

Innovation Solution

A specific organosilicon compound with a betaine structure, represented by formula (1), is used to create a coating composition that includes a hydrolysis condensation product, which can be combined with an inorganic oxide to enhance durability and hydrophilicity on substrates like glass or plastic.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a coating composition containing an organosilicon compound with a sulfobetaine structure is used to impart hydrophilicity to a substrate, then the substrate gains hydrophilicity and antifogging properties, but the coating film does not have sufficient water resistance and the surface characteristics deteriorate when contacted with water

Engineering Contradiction:

Improvewater resistanceVSAvoidsurface characteristics stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent uses a composite organosilicon compound structure combining a betaine skeleton with a sulfonate group and a specific hydrophilic group (carboxylate, sulfate, or phosphate). This composite molecular structure provides both the hydrophilicity needed for antifogging and the water resistance for durability, resolving the contradiction between surface characteristic improvement and water resistance.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the chemical parameters of the organosilicon compound by introducing specific functional groups (carboxylate, sulfate, or phosphate) at specific positions on the betaine skeleton. This parameter change enables the coating to maintain stable hydrophilicity and water resistance properties even after water exposure, preventing deterioration of surface characteristics.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If a coating film is made from the coating composition to provide hydrophilicity, then the substrate achieves antifogging properties, but the coating film lacks sufficient durability when exposed to water

Engineering Contradiction:

ImprovedurabilityVSAvoidwater exposure degradation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent converts the potentially harmful effect of water exposure into a beneficial demonstration of performance. The coating composition is designed to maintain its hydrophilicity and antifogging properties even after water exposure, transforming the water exposure condition from a degradation factor into a verification of the coating's durable performance.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent changes the chemical parameters of the coating composition by incorporating specific hydrophilic groups (carboxylate, sulfate, or phosphate) that provide both immediate hydrophilicity and long-term durability. These parameter changes enable the coating to resist water exposure degradation while maintaining its functional properties.

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 coating composition maintains excellent hydrophilicity and antifogging properties even after exposure to water, demonstrating improved durability and performance.

Implementation Method 1

a coating composition containing, as a main component, an organosilicon compound having a sulfobetaine structure

Methodology Applied

Scientific EffectHydrolysis condensation: Hydrolysis

Data Source

PatentEP4249493B1Organosilicon compound, hydrolysis condensation product of same, and coating composition

Publication Date: 2026.03.04 SHIN ETSU CHEMICAL CO LTD

AI summary

This organosilicon compound which comprises a betaine structure represented by formula (1) enables the achievement of a coating composition that has excellent hydrophilicity and excellent water resistance of antifogging properties. (In the formula, each of R1 and R2 independently represents an alkyl group having from 1 to 10 carbon atoms or an aryl group having from 6 to 10 carbon atoms; R3 represents a divalent organic group that contains an aromatic ring having from 6 to 14 carbon atoms; each of R4 and R5 independently represents an alkyl group having from 1 to 6 carbon atoms; X represents an alkylene group having from 1 to 10 carbon atoms; Y represents COO-, SO3- or PO4-; and n represents an integer from 1 to 3.)