Light Stabilizer Emulsion for Aqueous Coatings

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Solution Overview

Problem

Existing light stabilizer emulsions for aqueous coating compositions face issues with poor dispersion and storage stability, leading to inadequate weatherability and physical property deterioration in coating films.

Innovation Solution

A light stabilizer emulsion composition with an average particle size of 150 nm or less, achieved through the use of a specific range of emulsifiers and surfactants, ensures stable dispersion and long-term storage stability when added to aqueous coating agent compositions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a light stabilizer (oil-soluble organic compound) is added to an aqueous composition, then the coating film can have improved weatherability, but the light stabilizer is not dispersed well and separates during storage

Engineering Contradiction:

ImproveweatherabilityVSAvoidstorage stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent uses an emulsion polymerization process where the light stabilizer acts as a co-monomer, being incorporated into the polymer chains during synthesis. This intermediary approach (emulsion polymerization) allows the oil-soluble light stabilizer to be integrated into the aqueous polymer matrix, achieving both good dispersion and storage stability while maintaining weatherability functionality.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the physical state and distribution parameters of the light stabilizer by incorporating it into polymer chains during emulsion polymerization. This transforms the light stabilizer from a separate oil-soluble phase to an integrated component within the aqueous polymer emulsion, eliminating separation issues while preserving its light-stabilizing function.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If a light stabilizer is added to an aqueous composition, then weatherability can be improved, but the light stabilizer is not dispersed well because it is oil-soluble

Engineering Contradiction:

ImproveweatherabilityVSAvoiddispersion uniformity

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The emulsion polymerization process serves as an intermediary mechanism that bridges the incompatibility between oil-soluble light stabilizers and aqueous compositions. During polymerization, the light stabilizer is incorporated into forming polymer chains, creating a uniform dispersion throughout the aqueous matrix without requiring separate emulsification steps.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent merges the light stabilizer with the polymer matrix through co-polymerization, combining two previously incompatible phases (oil-soluble light stabilizer and aqueous polymer) into a single uniform structure. This merging achieves both good dispersion and maintains the light stabilizer's functional properties.

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If a light stabilizer is added to coating agent composition, then weatherability can be improved, but the coating film physical properties deteriorate

Engineering Contradiction:

ImproveweatherabilityVSAvoidcoating film physical properties

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent optimizes the concentration and integration parameters of the light stabilizer within the polymer matrix. By controlling the amount of light stabilizer incorporated during emulsion polymerization and adjusting polymerization conditions, the patent achieves sufficient weatherability protection while maintaining coating film physical properties such as gloss, adhesion, and flexibility.

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 composition maintains the physical properties of the coating film and enhances weatherability without causing separation or precipitation, ensuring effective long-term storage and performance.

Implementation Method 1

a light stabilizer emulsion composition containing: water; an emulsifier; and a light stabilizer and/or a UV absorber

Methodology Applied

Scientific EffectEmulsion: Emulsion

Implementation Method 2

The term 'light stabilizer' as used herein refers to, for example, a hindered amine compound for capturing radicals generated by deterioration or a UV absorber for capturing ultraviolet

Methodology Applied

Scientific EffectUV absorption: Absorption (EM radiation)

Implementation Method 3

a hindered amine compound for capturing radicals generated by deterioration

Methodology Applied

Scientific EffectRadical capture: Absorption (physical)

Data Source

PatentUS7671096B2Light stabilizer emulsion composition

Publication Date: 2010.03.02 ADEKA CORP

AI summary

The light stabilizer emulsion composition of the present invention includes: water; an emulsifier; and a light stabilizer and/or a UV absorber, in which components constituting the light stabilizer emulsion composition has an average particle size of 150 nm or less.