Petrolatum Cleansing Composition Low Reflectance Stability

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Solution Overview

Problem

Commercially available liquid personal cleansing compositions that are rich in hydrophobic emollient oils often appear milky, which is unattractive, and isotropic cleansing compositions that are transparent or low in reflectance cannot effectively structure substantial levels of hydrophobic emollients for stable skin moisturization.

Innovation Solution

A stable, multiphase isotropic cleansing composition is developed with 99-84% water, 1-16% petrolatum having a melting point between 35-80°C and minimum viscosity of 10 Kps at 32°C, along with specific surfactant and polymeric dispersion stabilizing agent ratios, and a multiport injector process to achieve a blend with a maximum reflectance of 80% and optimal Petrolatum particle size distribution.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If liquid crystalline cleansing compositions are used to structure substantial quantities of oils, then skin moisturization is effective, but the appearance becomes milky white which is unattractive

Engineering Contradiction:

Improveskin moisturization effectivenessVSAvoidappearance reflectance

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

The invention changes the physical parameters of the petrolatum by controlling its melting point (35-80°C) and viscosity (≥10 Kps at 32°C), and by controlling particle size distribution (greater than 50% of particles over 50 microns), to achieve both stability and attractive appearance

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a multiphase composite system combining petrolatum particles with specific surfactants (anionic and amphoteric) and polymeric dispersion stabilizing agents, where the composite structure enables both oil structuring and low reflectance appearance

Inventive Principle:

Principle #40Composite materials

2Illumination intensity

If isotropic cleansing compositions are used to achieve transparent or low reflectance appearance, then appearance is attractive, but the ability to structure substantial levels of hydrophobic emollients is lost

Engineering Contradiction:

Improveappearance reflectanceVSAvoidproduct stability for skin moisturization

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The invention changes the parameter of petrolatum particle size distribution, specifying that greater than 50% of petrolatum phase particles have diameters over 50 microns, which enables light scattering properties for attractive appearance while maintaining structuring capability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention introduces polymeric dispersion stabilizing agents as intermediaries that mediate between the petrolatum particles and aqueous phase, enabling stable dispersion of substantial petrolatum levels while maintaining isotropic low-reflectance appearance

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If high levels of hydrophobic emollient oils are incorporated, then skin moisturization is effective, but phase separation occurs reducing product stability

Engineering Contradiction:

Improveskin moisturization effectivenessVSAvoidproduct phase stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The invention uses polymeric dispersion stabilizing agents as intermediaries that adsorb onto petrolatum particle surfaces, preventing aggregation and phase separation while allowing high petrolatum concentrations for effective moisturization

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention creates a stable composite emulsion system where petrolatum, surfactants, and polymeric stabilizers form a structured multiphase system that prevents phase separation while maintaining high emollient content

Inventive Principle:

Principle #40Composite materials

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 composition maintains stability with no phase separation and achieves effective skin moisturization while maintaining an attractive, low-reflectance appearance, with greater than 50% of Petrolatum phase particles having diameters over 50 microns, ensuring consistent product attributes and performance.

Implementation Method 1

a stable, multiphase isotropic structured cleansing composition... contains a petrolatum with a specific melting point range... greater than 50% of Petrolatum phase particles having diameters over 50 microns

Methodology Applied

Scientific EffectDispersion: Dispersion (of waves)

Implementation Method 2

wherein an aqueous phase includes about 1 to 25% by wt. of a non-soap anionic surfactant... and about 1 to 20% by wt. of an amphoteric surfactant

Methodology Applied

Scientific EffectSurfactant action: Surfactant

Implementation Method 3

wherein the aqueous phase contains about 0.5 to 10% by wt. of total polymeric dispersion stabilizing agent(s)... no noticeable phase separation under the stability test conditions

Methodology Applied

Scientific EffectStabilization:

Data Source

PatentUS9931282B2Liquid personal cleansing composition

Publication Date: 2018.04.03 CONOPCO INC

AI summary

A stable, multiphase liquid isotropic cleansing composition is described that contains high levels of Petrolatum and shows a substantial decrease in reflectance compared with isotropic cleansing compositions containing other oils and liquid crystalline compositions with similar levels of oils. The inventive composition has a total of less than 2% by wt. of other oils such as glyceride, mineral and silicone oils, or blends thereof.