Resorbable Polymer Plaster Films for Flexible Adhesion
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Solution Overview
Problem
Conventional spray plasters based on acrylate-, silicone-, or polyurethane-polymers suffer from insufficient flexibility, adhesion to skin or wounds, and low water permeability, making them unsuitable for topical applications, particularly due to their hydrophobic nature and brittleness.
Innovation Solution
A plaster preparation comprising a resorbable polymer blend of trimethylene carbonate, glycolide, lactide, and ε-caprolactone, with a high viscosity and specific monomer ratios, which forms polymer films and nonwoven materials that exhibit excellent adhesion, extensibility, and water vapor permeability without the need for additional additives, using a spray plaster spray device to produce these materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional spray plasters comprising acrylate-, silicone- or polyurethane-based polymers are used, then the plaster provides basic protective function, but the polymer film becomes brittle and cracks after solvent evaporation, resulting in insufficient flexibility and adhesion to skin or wounds
Solution Approach 1:
The patent changes the chemical composition parameters of the polymer from conventional acrylate/silicone/polyurethane to copolymers of lactide and ε-caprolactone with specific molar ratios (70:30 to 95:5). This parameter change transforms the film properties from brittle to flexible and adhesive, resolving the contradiction between film integrity and flexibility/adhesion.
Solution Approach 2:
The patent uses composite polymer materials formed by copolymerization of lactide and ε-caprolactone monomers. This composite approach creates a material that combines the desirable properties of both monomers, achieving both flexibility and adhesion while maintaining film integrity, thus resolving the technical contradiction.
2Strength
If copolymers of lactide and ε-caprolactone are used to improve flexibility, then the polymer becomes more flexible and adhesive, but the water vapor permeability decreases due to high hydrophobicity
Solution Approach 1:
The patent optimizes the molar ratio parameter of lactide to ε-caprolactone within the range of 70:30 to 95:5. This parameter optimization balances the hydrophobicity (affecting flexibility) and hydrophilicity (affecting water vapor permeability), resolving the contradiction between flexibility/adhesion and water vapor permeability.
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 resulting polymer films and nonwoven materials demonstrate high adhesion and extensibility, maintaining integrity during stretching and washing, while providing effective water vapor permeability, promoting wound healing and comfort by forming a flexible, breathable barrier.
Implementation Method 1
the copolymers are prepared by conversion of the monomers in a lactide to reactant molar ratio of approximately 95 to 70 to 5 to 30 with the addition of metal carboxylates known per se as initiators at temperatures of approximately 150° C. for a period of approximately 16 to 48 hours
Implementation Method 2
sprayed-on films quickly become brittle and cracked after evaporation of the solvent
Implementation Method 3
conventional spray plasters comprising acrylate-, silicone- or polyurethane-based polymers, a solvent, such as ethyl acetate, and a propellant
Data Source
AI summary
A plaster preparation includes (a) at least one resorbable polymer made of at least three monomer units, in particular a terpolymer, having monomers selected from the group consisting of trimethylene carbonate, glycolide, lactide (in particular DL-lactide), p-dioxanone, ε-caprolactone and/or butyrolactone; (b) at least one readily vaporizable organic solvent; and (c) at least one propellant. The plaster preparation additionally relates to a polymer film, to a spray plaster spray device, to a method for producing polymer fiber nonwoven materials, to a polymer fiber nonwoven material, and to uses of the plaster preparation.