Self-standing Cosmetic Sheet Nanometer Thickness Adhesion
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Solution Overview
Problem
Existing cosmetic sheets for the skin are either perceived on the skin due to their thickness, irritate the skin with adhesive layers, or lack materials for biodegradability and versatility in providing cosmetic effects such as wrinkle hiding, skin protection, and active ingredient delivery.
Innovation Solution
A self-standing cosmetic sheet with a thickness of 10 to 1000 nm, composed of biocompatible and biodegradable hydrophobic polymers, including cationic and anionic polymers, which can adhere to the skin without adhesives, providing cosmetic effects like wrinkle hiding, skin protection, and active ingredient delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the thickness of the cosmetic sheet is reduced to make it less perceived on the skin, then the cosmetic effect is improved, but the self-standing property deteriorates
Solution Approach 1:
The patent applies parameter changes by controlling the thickness of the cosmetic sheet within a specific range (10-1000 nm) and adjusting the molecular weight and composition of the polymer to achieve both thinness and self-standing capability. The polymer's intrinsic viscosity and molecular weight are optimized to maintain structural integrity at nanometer thickness levels.
Solution Approach 2:
The patent uses composite materials by combining biocompatible and biodegradable polymers with specific properties (intrinsic viscosity 0.5-5 dl/g, molecular weight 10^5-10^7) to create a sheet that is both thin and self-standing. The composite structure allows the material to maintain strength while achieving the required thickness for cosmetic effects.
2Ease of operation
If an adhesive layer is added to enable the cosmetic sheet to adhere onto the skin, then the adhesion is improved, but skin irritation and rash occur
Solution Approach 1:
The patent applies the extraction principle by completely removing the adhesive layer from the cosmetic sheet structure. Instead of using adhesives, the sheet relies on its own surface properties (controlled through polymer selection and thickness optimization) to adhere gently to the skin, thereby eliminating the source of irritation and rash.
Solution Approach 2:
The patent uses the polymer surface itself as an intermediary between the cosmetic sheet and the skin. By controlling the polymer's surface characteristics (through molecular weight and intrinsic viscosity), the sheet achieves adequate adhesion without requiring harsh adhesive chemicals, thus preventing skin irritation.
3Length of stationary object
If the cosmetic sheet is made thinner to provide better cosmetic effects, then the cosmetic performance is improved, but the sheet becomes more difficult to handle and apply
Solution Approach 1:
The patent optimizes multiple parameters simultaneously: thickness (10-1000 nm), polymer molecular weight (10^5-10^7), and intrinsic viscosity (0.5-5 dl/g). This multi-parameter optimization ensures the sheet remains thin enough for cosmetic effects while maintaining sufficient flexibility and handleability for practical application.
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 cosmetic sheet is nearly invisible, non-irritating, and effective in delivering cosmetic active ingredients, offering long-term skin benefits while being biodegradable and versatile in application.
Implementation Method 1
the cosmetic sheet comprises at least one cationic polymer and at least one anionic polymer
Data Source
AI summary
The present invention relates to a cosmetic process which applies onto the skin a self-standing cosmetic sheet for the skin, comprising:at least one biocompatible and/or biodegradable hydrophobic polymer layerwhereinthe self-standing cosmetic sheet has a thickness of from 10 to 1000 nm, preferably from 30 to 500 nm, and more preferably from 50 to 300 nm. The cosmetic sheet according to the present invention may comprise at least one cosmetic active ingredient.The cosmetic sheet used in the present invention is very thin and not easily perceived on the skin; can be prepared with a variety of materials such as a biocompatible and/or biodegradable material; and can adhere well onto the skin without any adhesive layer so that it is less irritable or no irritable to the skin.