Nonionic Cleanser Composition for Low-Irritation Leave-On Cleansing
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Solution Overview
Problem
Existing cleansers, whether rinse-off or leave-on, cause skin irritation due to the presence of amphoteric surfactants, which remain on the skin and are irritating.
Innovation Solution
A cleanser composition comprising nonionic surfactants with a Hydrophile-Lipophile Balance (HLB) of 10 to 18 and a cosurfactant like alkylglycerols or glycerin fatty acid esters, with minimal ionic surfactants, forming a sponge phase that reduces skin irritation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If amphoteric surfactants are used in cleansers, then cleansability is improved, but skin irritation occurs due to residual surfactant remaining on the skin
Solution Approach 1:
The invention extracts and removes amphoteric surfactants from the cleanser formulation, replacing them with nonionic surfactants. This eliminates the source of skin irritation while maintaining cleansability through the selected nonionic surfactant system with HLB 10-18 and cosurfactants.
Solution Approach 2:
The invention changes the chemical parameter of the surfactant system from amphoteric to nonionic type, and adjusts the HLB parameter to 10-18 range. This parameter change fundamentally alters the surfactant's behavior on skin, reducing irritation while preserving cleaning performance.
2Productivity
If rinse-off-type cleansers with strong cleansing agents are used, then cleansability is improved, but strong skin irritation occurs
Solution Approach 1:
The invention changes the surfactant type parameter from strong cleansing agents (anionic/amphoteric) to nonionic surfactants with moderate HLB values. This parameter change softens the cleansing action to be less irritating while maintaining effectiveness through the cosurfactant system.
Solution Approach 2:
The invention uses a composite surfactant system combining nonionic surfactants with HLB 10-18 and specific cosurfactants (alkylglycerols, glycerin fatty acid esters). This composite approach achieves balanced cleansability and skin compatibility that neither component could achieve alone.
3Ease of operation
If leave-on-type cleansers are used to avoid rinsing, then convenience is improved, but skin irritation occurs due to surfactant residue
Solution Approach 1:
The invention extracts amphoteric and anionic surfactants that cause irritation and residue problems, leaving only nonionic surfactants that are skin-compatible and suitable for leave-on application. This removal enables convenient leave-on use without irritation.
Solution Approach 2:
The invention changes the surfactant charge parameter from ionic (amphoteric/anionic) to nonionic, fundamentally altering the residue characteristics on skin. Nonionic surfactants with HLB 10-18 provide a residue that is non-irritating and skin-compatible, enabling leave-on application.
4Object-affected harmful factors
If nonionic surfactants with appropriate HLB are used, then skin irritation is reduced, but cleansability may be compromised
Solution Approach 1:
The invention creates a composite surfactant system pairing nonionic surfactants (HLB 10-18) with specific cosurfactants (alkylglycerols and glycerin fatty acid esters). This composite system synergistically enhances cleansability while the nonionic nature maintains skin compatibility.
Solution Approach 2:
The cosurfactants act as intermediaries that bridge the gap between nonionic surfactants and the contaminants to be removed. They enhance the cleansing mechanism of nonionic surfactants, compensating for any reduced cleansability while maintaining the gentle, non-irritating character of the nonionic system.
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 cleanser composition provides high cleansing capability with minimal skin irritation, suitable for use as a leave-on or wipe-off cleanser without requiring rinsing, maintaining a fresh feel and reducing greasiness.
Implementation Method 1
the cleanser composition has a sponge phase including the nonionic surfactant as a constituent component
Data Source
AI summary
A cleanser composition contains (A) a nonionic surfactant having a HLB of from 10 to 18; and (B) a cosurfactant including at least one selected from the group consisting of alkylglycerols and glycerin fatty acid esters. A content of the cosurfactant is 0.3% by mass or greater relative to the mass of the cleanser composition. A total amount of ionic surfactants is 0.10% by mass or less relative to the mass of the cleanser composition.