Method for preparing a nanocellulose and metal-oxide mixture for use in an SPF booster composition

A nanocellulose and metal-oxide mixture prepared by reducing cellulose fibers and homogenizing with metal-oxides addresses the texture and efficacy issues of physical sunscreens, enhancing UV protection and spreadability.

WO2025178574A1 Publication Date: 2025-08-28SCG PACKAGING PUBLIC CO LTD
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Patent Information

Application Number
PCT/TH2025/000002
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-02-19
Filing Date
2025-02-14
Publication Date
2025-08-28

AI Technical Summary

Technical Problem

Physical sunscreen products require high amounts of mineral-based sunscreen agents to achieve sufficient UV protection, leading to a white cast and viscosity issues, affecting texture and even application.

Method used

A method to prepare a nanocellulose and metal-oxide mixture by reducing cellulose fibers to nanoscale and homogenizing them with metal-oxides under high pressure, creating a network structure for uniform dispersion and enhanced UV protection.

Benefits of technology

The mixture significantly enhances UV protection efficacy, improving SPF and UVAPF while reducing the amount of sunscreen agents needed, ensuring better texture and spreadability.

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Abstract

The present invention discloses a method for preparing a nanocellulose and metal-oxide mixture for use in an SPF booster composition. The method comprises the steps of reducing a cellulose fiber size to obtain nanocellulose, and mixing a metal-oxide with the nanocellulose obtained from the size reduction step to obtain the nanocellulose and metal-oxide mixture. The step of mixing metal-oxide with the size-reduced nanocellulose is performed by homogenizing the nanocellulose and metal-oxide mixture at least twice under a pressure ranging from 2,000-30,000 pounds per square inch.
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