Thin Polyurethane Acrylic Patch for Skin Conformability
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Solution Overview
Problem
Conventional makeup-assisting patches are conspicuous, cause physical discomfort, and fail to protect the skin effectively, leading to issues like rash and inadequate cosmetic application, limiting their use in rehabilitation makeup methods.
Innovation Solution
A makeup-assisting patch with a thin polyurethane elastomer base layer and a thin acrylic pressure-sensitive adhesive layer, designed to be inconspicuous, flexible, and breathable, allowing for natural makeup application while protecting the skin from cosmetic compositions and UV rays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional makeup-assisting patch is used, then the patch provides basic adhesive function, but it becomes conspicuous on the skin and causes physical discomfort
Solution Approach 1:
The patent applies a thin film structure with a base layer of 1-8 μm and adhesive layer of 1-8 μm, making the patch extremely thin and flexible. This thin film structure allows the patch to conform to skin wrinkles and fine irregularities while remaining inconspicuous, directly resolving the contradiction between providing adhesive function and avoiding visibility/discomfort
Solution Approach 2:
The patent changes the thickness parameters of the base layer and adhesive layer to extremely thin dimensions (1-8 μm each), and controls the peeling force within a specific range (0.1-3 N/10 mm). These parameter changes enable the patch to be inconspicuous while maintaining sufficient adhesion, solving the contradiction between visibility and adhesive function
2Ease of manufacture
If a thin patch is used to reduce visibility, then the patch becomes inconspicuous, but it may not provide sufficient protection against cosmetic compositions and UV rays
Solution Approach 1:
The patent uses a composite structure combining a polyurethane elastomer base layer with an acrylic pressure-sensitive adhesive layer. This composite material approach allows the patch to achieve both extreme thinness (1-8 μm per layer) and sufficient protective function, as each layer contributes specific properties that together provide comprehensive skin protection despite the minimal total thickness
3Ease of manufacture
If the adhesive layer is made thin to reduce patch thickness, then the patch becomes more flexible and inconspicuous, but the adhesive strength may be insufficient
Solution Approach 1:
The patent optimizes the adhesive layer thickness parameter to 1-8 μm and controls the peeling force within a specific range (0.1-3 N/10 mm). This parameter optimization ensures that the adhesive layer remains extremely thin for flexibility and inconspicuousness while maintaining sufficient adhesive strength through controlled peeling force characteristics
Solution Approach 2:
The patent uses an acrylic pressure-sensitive adhesive that provides localized strong adhesion despite the extremely thin layer (1-8 μm). The pressure-sensitive adhesive formulation creates concentrated adhesive action at the skin interface, achieving sufficient bonding strength without requiring increased layer thickness
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 patch is conformable to skin wrinkles, reduces the risk of rash, provides a natural touch, and allows easy cosmetic application, making it suitable for rehabilitation makeup methods by enhancing the appearance and psychological well-being of individuals with skin damage.
Implementation Method 1
a pressure sensitive adhesive layer is provided on one surface of a base layer
Data Source
Figure 1~3(6)
AI summary
A makeup-assisting patch having a layer structure that a pressure sensitive adhesive layer is provided on one surface of a base layer, wherein (1) the base layer is a layer of a polyurethane elastomer having a glass transition temperature of 0°C or lower, (2) the pressure sensitive adhesive layer is an acrylic pressure sensitive adhesive layer composed of a copolymer containing at least one monomer unit selected from the group consisting of an alkyl acrylate and an alkyl methacrylate each having an alkyl group having 8 to 12 carbon atoms in a proportion of 70% by weight or more, and (3) the thickness of the base layer is 1 to 10 µm, the thickness of the pressure sensitive adhesive layer is 1 to 15 µm, and the total thickness of these both layers is 2 to 20 µm.