UV Filter Cosmetic Composition with Cellulose-Based Water Resistance

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Solution Overview

Problem

Cosmetic compositions comprising UV filters experience a significant decrease in UV protection capacity when exposed to water, such as during bathing, due to the removal of UV filters from the skin.

Innovation Solution

Incorporating a specific combination of cellulose, a mixture of branched and linear saturated C15-C19 alkanes, and an ester of a fatty acid and dextrin into cosmetic compositions with UV filters to enhance water resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a cosmetic composition comprises UV filters, then UV protection capacity is provided, but water resistance is poor leading to significant removal of UV-filter from skin

Engineering Contradiction:

ImproveUV protection capacityVSAvoidwater resistance

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent applies composite materials by combining UV filters with a specific formulation system consisting of cellulose derivatives, C15-C19 alkanes, and esters of fatty acids with dextrin or sucrose. This composite formulation creates a water-resistant matrix that maintains UV filter adherence to skin during water exposure, directly resolving the contradiction between providing UV protection and achieving water resistance.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent uses cellulose derivatives and ester compounds as intermediary substances that act as binding agents between the UV filters and the skin surface. These intermediaries form a water-resistant film that anchors the UV filters, preventing their removal during water exposure while maintaining the UV protection function.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If exposure to water occurs during bathing, then skin cleaning is achieved, but UV-filter removal from skin occurs leading to decreased protection capacity

Engineering Contradiction:

Improveskin cleaningVSAvoidprotection capacity

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent employs a flexible water-resistant film formed by cellulose derivatives and ester compounds that envelops the UV filters on the skin surface. This thin film allows for normal skin cleaning while preventing water and surfactants from penetrating to remove the UV filters, thereby maintaining protection capacity during bathing.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The formulation applies a protective water-resistant layer beforehand that cushions the UV filters against water exposure. This pre-formed protective barrier prevents the harmful effect of water-induced filter removal before it can occur during bathing activities.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Data Source

PatentUS20250221915A1Improvement of the water resistance of cosmetic compositions comprising UV filters

Publication Date: 2025.07.10 TOTALENERGIES ONETECH

AI summary

The present invention relates to cosmetic composition comprising UV-filter(s), an ester of a fatty acid and dextrin and a mixture of branched and linear saturated C15-C19, wherein said mixture comprised primarily branched saturated C15-C19 and a specific cellulose derivative. This cosmetic composition shows a significantly increased water resistance.