Erodable Solid Moisturizing Composition for Hair Removal
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Solution Overview
Problem
Existing hair removal devices face challenges in providing effective skin moisturization while maintaining mechanical and rheological properties, as hydrophilic polymers are washed away during use and hydrophobic emollients can be over-delivered initially and increase friction, leading to a less pleasant experience.
Innovation Solution
A hair removal device with an erodable, solid moisturizing composition comprising a water-insoluble structuring polymer and a hydrophobic phase of petrolatum, esters, and waxes, which provides sustained skin moisturization and improved wear properties, including a Chatillon Hardness range of 0.50 - 3.25 kg, ensuring even distribution and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrophilic polymers are used to bind water for skin moisturization, then water-binding ability is improved, but the materials are washed away during wet shaving
Solution Approach 1:
The patent changes the fundamental parameter of hydrophilicity to hydrophobicity, transitioning from water-binding polymers to water-insoluble structuring polymers combined with hydrophobic emollients. This parameter change allows the composition to resist washing away while maintaining moisturization through occlusion rather than water binding.
Solution Approach 2:
The invention creates a composite material system combining water-insoluble structuring polymers with hydrophobic emollients in specific proportions. This composite approach leverages the structural integrity of the polymer network and the moisturizing properties of the hydrophobic phase to achieve both durability and moisturization.
2Reliability
If occlusive hydrophobic emollients are used to retain water on skin, then moisturization is improved, but mechanical and rheological properties become unsuitable for onboard chemistry
Solution Approach 1:
The patent modifies the concentration parameters of hydrophobic emollients, limiting them to 60-95% of the total composition rather than higher proportions. This parameter control prevents excessive softness while maintaining moisturization benefits.
Solution Approach 2:
The invention develops a composite material where water-insoluble structuring polymers (3-40%) provide mechanical strength and structural stability, while hydrophobic emollients (60-95%) provide moisturization. The synergistic interaction between these components resolves the contradiction between softness and structural integrity.
3Reliability
If hydrophobic emollients are used in significant proportions, then moisturization is improved, but drag across skin increases due to affinity with hydrophobic skin surface
Solution Approach 1:
The patent optimizes the concentration parameter of hydrophobic emollients to 60-95% of the total composition, balancing moisturization benefits with acceptable friction levels. This parameter optimization prevents excessive drag while maintaining effective moisturization.
Solution Approach 2:
The composite material system combines hydrophobic emollients with water-insoluble structuring polymers, where the polymer network modulates the overall surface properties. This composite approach reduces excessive affinity with the hydrophobic skin surface compared to pure hydrophobic emollient systems.
4Duration of action of stationary object
If hydrophobic emollients are used in onboard chemistry, then sustained moisturization is achieved, but composition integrity may be impaired by contact with hair
Solution Approach 1:
The invention creates a composite material where water-insoluble structuring polymers form a robust network that maintains composition integrity during contact with hair. The hydrophobic emollients are distributed within this network, providing sustained moisturization without compromising structural stability.
Solution Approach 2:
The patent specifies that water-insoluble structuring polymers should constitute 3-40% of the composition, providing sufficient structural support to maintain integrity during use while allowing adequate hydrophobic emollient content for sustained moisturization.
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 device effectively deposits hydrophobic materials onto the skin during multiple uses, increasing skin tension and reducing friction, resulting in a more pleasant hair removal experience while maintaining flexibility and hardness.
Implementation Method 1
a water-insoluble structuring polymer comprising a block copolymer comprising a di-block copolymer, a tri-block copolymer, a multi-block copolymer, a radial block copolymer, a random block copolymer
Implementation Method 2
occlusive, hydrophobic materials which cover the skin and therefore act to retain water already present in the skin
Implementation Method 3
an erodable, solid moisturizing composition
Data Source
AI summary
A hair removal device is provided comprising an erodable, solid moisturizing composition, the erodable, solid moisturizing composition comprising: a. A water-insoluble structuring polymer; b. At least 50% moisturizing hydrophobic phase by weight of the solid moisturizing composition.