Painted body

A coating with a surface layer of hydrophilic silica and inorganic oxide particles addresses the challenge of stain resistance by forming an uneven structure that repels both water-based and oil-based stains, enhancing cleaning efficiency and durability.

JP2026086111APending Publication Date: 2026-05-26TOTO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
TOTO LTD
Filing Date
2024-11-14
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing coatings do not effectively provide stain resistance against both water-based and oil-based stains, lacking a balanced composition of hydrophilic silica particles and inorganic oxide particles to optimize surface properties for easy cleaning and durability.

Method used

A coating comprising a substrate with a surface layer containing hydrophilic silica particles of 70 nm or more and inorganic oxide particles, with each occupying at least 20% of the surface area, forming an uneven structure that repels both water-based and oil-based stains.

Benefits of technology

The coating achieves excellent resistance to both water-based and oil-based stains by chemically and physically optimizing the surface properties, ensuring easy cleaning and durability without the use of fluorine-containing compounds.

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Abstract

To provide a coating that exhibits excellent stain resistance against both water-based and oil-based stains. [Solution] A coated body comprising a base material and a surface layer containing a resin, wherein the surface layer further comprises hydrophilic silica particles having a particle size of 70 nm or more and inorganic oxide particles different from the hydrophilic silica particles, and the surface of the surface layer is obtained by SEM-EDX analysis, wherein the ratio of the area of ​​the hydrophilic silica particles to the surface area of ​​the surface layer is 20% or more, and the ratio of the area of ​​the inorganic oxide particles to the surface of the surface layer is 20% or more.
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