Electrostatic Skin Coating Composition for Sebum-Resistant Film
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Solution Overview
Problem
Existing coating methods via electrostatic spraying on skin or similar surfaces often result in coatings with conspicuous pores, tearing, and reduced removability, particularly on areas with high sebum levels, leading to adhesion issues and difficulty in peeling off without damage.
Innovation Solution
A composition comprising volatile substances, a water-insoluble polymer with fiber-forming ability, and polyols is used, with specific molecular weight and content ratios to create a fiber-containing deposit that is sebum-resistant, adhesive, and easy to remove, employing electrostatic spraying to form a uniform, transparent coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electrostatic spraying is used to form a coating on skin, then the coating can be applied efficiently, but the coating develops conspicuous pores and tearing, especially on high-sebum areas
Solution Approach 1:
The patent uses a composite polymer system comprising a water-soluble polymer (first polymer) and a water-insoluble polymer (second polymer). The water-soluble polymer fills pores and provides adhesion, while the water-insoluble polymer forms the coating matrix. This composite structure prevents pore formation and tearing, especially on high-sebum areas, while maintaining efficient electrostatic spraying application.
2Strength
If the coating adheres strongly to skin, then it provides good adhesion, but it becomes difficult to remove without damage
Solution Approach 1:
The patent controls the molecular weight of the water-soluble polymer within a specific range (1,000 to 1,000,000) and sets the mass ratio of water-soluble to water-insoluble polymer between 0.01 and 10. These parameter optimizations enable the coating to adhere strongly during application while allowing easy, damage-free removal afterward, as the controlled polymer composition facilitates clean detachment.
3Strength
If high molecular weight polymer is used to prevent tearing, then coating strength improves, but coating formation becomes difficult
Solution Approach 1:
The patent divides the polymer system into two functional segments: a water-soluble polymer (first polymer) with molecular weight 1,000 to 1,000,000 that facilitates coating formation and application, and a water-insoluble polymer (second polymer) with molecular weight 10,000 to 1,000,000 that provides tearing resistance. This segmentation allows each component to optimize its function without compromising the other.
4Ease of operation
If the coating is made porous for breathability, then comfort improves, but structural integrity deteriorates with visible pores and tearing
Solution Approach 1:
The patent creates a homogeneous coating structure where the water-soluble polymer uniformly distributes and fills potential pore spaces within the matrix formed by the water-insoluble polymer. This homogeneous composition eliminates conspicuous pores while maintaining coating integrity and preventing tearing, achieving both comfort and structural uniformity.
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 solution produces a coating that is resistant to sebum, maintains high adhesiveness, prevents tearing, and allows for easy and clean removal, even on high-sebum surfaces, ensuring durability and comfort.
Implementation Method 1
forming a coating composed of a fiber-containing deposit directly on the skin via electrostatic spraying
Implementation Method 2
the volatile substance is volatilized to form a coating on the skin or the like, composed of the polymer having coating-forming ability
Data Source
AI summary
A coating-forming composition for forming a coating composed of a fiber-containing deposit directly on skin via electrostatic spraying, the coating-forming composition containing the following component (A), component (B), and component (C): (A) one or more volatile substances selected from the group consisting of water, alcohols, and ketones, (B) a water-insoluble polymer having fiber-forming ability, and (C) one or more polyols. Where (B1) a polymer with a molecular weight of 1×105 or more is contained as the component (B), and a mass content ratio of the component (B1) to the component (B), ((B1)/(B)), is 0.5 or more, and a mass content ratio of the component (B) to the component (C), ((B)/(C)), is 1 or more.