Skin Cleansing Agent With Acid-Modified PVA Release Particles

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Solution Overview

Problem

Existing skin cleansing agents struggle to maintain moisturization after cleansing while effectively removing dirt, often leading to dry skin and separation of oily components, and they lack stability during storage.

Innovation Solution

A skin cleansing agent containing water-holding oil agents, moisturizing agents, and acid-modified polyvinyl alcohol particles that disintegrate upon dilution, allowing the agents to remain on the skin post-cleansing, ensuring moisturization and stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of stationary object

If skin cleansing agents contain oil agents and moisturizing agents, then moisturizing effect is improved, but separation of oily components occurs and storage stability deteriorates

Engineering Contradiction:

Improvemoisturizing effectVSAvoidstorage stability

Core Design Contradiction:

Duration of action of stationary objectVSStability of the object's composition

Solution Approach 1:

The patent divides the cleansing agent into two distinct phases: an aqueous phase containing surfactants for cleansing, and an oil phase containing oil agents and moisturizing agents. This segmentation prevents separation and maintains storage stability while preserving the moisturizing effect, as each phase remains distinct yet functional during storage and application.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a nonionic surfactant as an intermediary substance that is soluble in both water and oil phases. This intermediary facilitates stable emulsification and prevents separation between the aqueous and oil phases, ensuring both storage stability and effective delivery of moisturizing components to the skin.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If skin cleansing agents use conventional surfactants, then cleansing ability is achieved, but skin dryness occurs and moisturizing effect is lost

Engineering Contradiction:

Improvecleansing abilityVSAvoidskin dryness

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent merges the cleansing function (performed by surfactants) with the moisturizing function (performed by oil agents and moisturizing agents) into a single integrated formulation. The dual-phase structure allows both functions to operate simultaneously without compromising either, eliminating skin dryness while maintaining effective cleansing.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent creates a composite cleansing agent system combining multiple components: aqueous phase with surfactants, oil phase with oil agents and moisturizing agents, and a nonionic surfactant intermediary. This composite structure enables simultaneous cleansing and moisturizing effects, preventing skin dryness while maintaining cleaning performance.

Inventive Principle:

Principle #40Composite materials

3Duration of action of stationary object

If skin cleansing agents leave oil agents on the skin, then moisturizing effect is improved, but rinsability deteriorates

Engineering Contradiction:

Improvemoisturizing effectVSAvoidrinsability

Core Design Contradiction:

Duration of action of stationary objectVSEase of operation

Solution Approach 1:

The patent applies local quality by providing different functional zones: the aqueous phase handles cleansing and rinsability, while the oil phase handles moisturizing effects. The nonionic surfactant intermediary ensures controlled distribution, allowing oil agents to remain on the skin for moisturization while maintaining easy rinsability through the aqueous surfactant system.

Inventive Principle:

Principle #3Local quality

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 agent provides a moist and soft skin feeling, maintains moisturization, and ensures stable storage by incorporating water-holding oil and moisturizing agents in salt-sensitive particles that release upon dilution, enhancing cleansing ability and rinsability.

Implementation Method 1

acid-modified polyvinyl alcohol particles that disintegrate upon dilution, allowing the agents to remain on the skin post-cleansing

Methodology Applied

Scientific EffectDilution-induced disintegration:

Implementation Method 2

a water-holding oil agent (A1) in an amount of from 0.0001 to 13 mass% in the skin cleansing agent

Methodology Applied

Scientific EffectWater holding capacity: Absorption (physical)

Data Source

PatentEP4066903B1Skin cleansing agent

Publication Date: 2025.11.05 KAO CORP

AI summary

A skin cleansing agent containing the following components (A), (B), and (C): a particle (A) including (A1), (A2), and (A3), (A1) a water-holding oil agent in an amount of from 0.0001 to 13 mass% in the skin cleansing agent, (A2) a moisturizing agent in an amount of from 0.001 to 25 mass% in the skin cleansing agent, and (A3) a polymer; a surfactant (B); and water (C).