Hair Care Composition with 1,2-Diols and Solid Particles
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Solution Overview
Problem
Conventional shampoos often strip hair of natural lubricants, leading to a dry and squeaky feel, while failing to effectively delay the appearance and feel of an unclean scalp and hair due to continuous sebum secretion and re-accumulation.
Innovation Solution
A pre-wash composition comprising 1,2-diols with a carbon chain length of more than 8 carbons and hydrophobic particles like silica silylate or zinc carbonate, which modify sebum physical properties to reduce transfer to hair fibers and enhance subsequent shampoo cleansing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If surfactant-containing shampoos are used to clean hair, then sebum removal efficiency is improved, but hair natural lubricants are stripped leading to dry and squeaky hair feel
Solution Approach 1:
The patent introduces a pre-wash composition containing sebum-modifying agents (1,2-diols and hydrophobic particles) as an intermediary step before shampooing. This pre-treatment modifies sebum properties to facilitate easier removal by subsequent shampoo while minimizing the need for aggressive surfactant action, thereby protecting hair natural lubricants.
Solution Approach 2:
The pre-wash composition is applied before shampooing to modify sebum physical properties in advance. The 1,2-diols and hydrophobic particles interact with sebum on scalp and hair, changing its characteristics so that subsequent shampoo cleansing can remove sebum more effectively without requiring harsh surfactant concentrations that strip hair lubricants.
2Quantity of substance
If high surfactant concentration shampoos are used, then sebum removal is improved, but hair natural lubricants are stripped leading to dry and squeaky hair feel
Solution Approach 1:
The pre-wash composition acts as an intermediary that modifies sebum properties before the main cleansing action. By treating sebum with 1,2-diols and hydrophobic particles first, the subsequent shampoo can use lower surfactant concentrations to achieve the same sebum removal effect, thus preserving hair natural lubricants.
Solution Approach 2:
The patent changes the physical parameters of sebum through the pre-wash treatment. The 1,2-diols and hydrophobic particles alter sebum's chemical and physical characteristics, making it more susceptible to removal by milder shampoo formulations, thereby reducing the need for high surfactant concentrations.
3Ease of operation
If conventional shampoos are used, then cleaning is achieved, but sebum re-accumulation occurs within 5-6 hours leading to unclean appearance
Solution Approach 1:
The pre-wash composition is applied before shampooing to modify sebum properties in advance. This preliminary modification ensures that when shampoo is applied, sebum is more effectively removed and the clean state is prolonged. The treated sebum is less prone to rapid re-accumulation, extending the cleanliness duration beyond the typical 5-6 hours.
Solution Approach 2:
The patent creates a continuous protective effect by modifying sebum properties that persist after washing. The 1,2-diols and hydrophobic particles leave a residual effect on scalp and hair that continues to inhibit rapid sebum re-accumulation, maintaining clean appearance for an extended period between washes.
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 provides a durable clean feel and easy sebum removal, maintaining hair cleanliness for longer without negatively affecting hair feel, as demonstrated by reduced sebum transfer and improved shampoo cleansing performance.
Implementation Method 1
the presence of the combination of these materials in hair care compositions provide for the benefits by modifying the sebum physical properties such as melting characteristic and/or absorbing sebum
Implementation Method 2
the interfacial tension between the solid particle and sebum is from 5 to 18 dyn/cm as measured using the Contact Angle Method
Data Source
Figure 1
AI summary
The present invention is directed to a hair care composition having from about 0.1 wt.% to about 12 wt.% of a 1,2-diol having a carbon chain with a length of more than 8 carbons; from about 0.1 wt.% to about 10 wt.% of a solid particle, wherein (1) the interfacial tension between the solid particle and sebum is from about 5 to about 18 dyn/cm;(2) the sebum exhibits spreading coefficient on the solid, which is greater than about 22 dyn/cm; and (3) the work of adhesion of the sebum to the solid particle, which is greater than about 75 dyn/cm. and an aqueous carrier.