Medical Silicone PSA Composition for Moisture-Stable Skin Adhesion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing medical silicone pressure-sensitive adhesives face issues with adhesion loss in moist environments and complex production processes, particularly in medical applications requiring biocompatibility and enhanced aeration.
Innovation Solution
A medical silicone pressure-sensitive adhesive composition comprising organopolysiloxanes with specific molar ratios and crosslinkable by hydrosilylation, including organopolysiloxane A, B, CE, and optionally XL, with a hydrosilylation catalyst and solvent, to form a crosslinked adhesive with improved properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicone-based PSA is used to improve biocompatibility and water resistance, then adhesion to skin is improved, but adhesion is lost in moist environments causing peeling
Solution Approach 1:
The patent modifies the chemical composition parameters of the silicone PSA by incorporating specific ratios of organopolysiloxane A (with alkenyl groups), organopolysiloxane resin B (with hydroxyl groups), and organopolysiloxane crosslinker XL. This chemical parameter adjustment enables the adhesive to maintain bonding strength in moist environments while preserving the biocompatibility and water resistance characteristics of silicone-based materials.
Solution Approach 2:
The patent creates a composite silicone PSA system by combining multiple organopolysiloxane components with different functional groups (alkenyl, hydroxyl, hydrogen atoms). This composite approach allows the material to simultaneously achieve adhesion to skin, resistance to moisture-induced peeling, and maintenance of biocompatibility, resolving the contradiction between adhesion stability and moisture sensitivity.
2Reliability
If polycondensation reaction is used to cure silicone PSA, then adhesion is achieved, but production process becomes complicated with strict control requirements
Solution Approach 1:
The patent replaces the complex polycondensation reaction process with a hydrosilylation crosslinking mechanism. This substitution simplifies the production process by eliminating the need for strict control of condensation reaction conditions while still achieving reliable adhesion. The hydrosilylation process uses a catalyst system that enables crosslinking under milder and more controllable conditions.
Solution Approach 2:
The patent changes the curing mechanism from polycondensation to hydrosilylation crosslinking, fundamentally altering the chemical process parameters. This parameter change simplifies manufacturing by reducing the stringency of process control requirements while maintaining adhesion strength, thereby resolving the contradiction between reliability and production complexity.
3Ease of manufacture
If acrylic-based PSA is used for skin touch products, then ease of manufacture is improved, but biocompatibility and sweat resistance deteriorate
Solution Approach 1:
The patent develops a composite silicone PSA formulation that combines the manufacturing advantages of silicone-based materials with improved biocompatibility and sweat resistance. By creating a multi-component system with specific organopolysiloxane ratios, the patent achieves both ease of manufacture and enhanced biocompatibility, resolving the contradiction between manufacturing simplicity and material reliability.
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 composition provides excellent adhesion, ease of tearing, invisible residue, good anchorage, and suitable release force, suitable for medical applications with enhanced biocompatibility and aeration.
Implementation Method 1
The present invention relates to a medical silicone pressure-sensitive adhesive composition which is crosslinkable by hydrosilylation
Data Source
AI summary
A medical silicone pressure-sensitive adhesive composition is described that includes at least one organopolysiloxane gum A including, per molecule, at least two C2 to C6 alkenyl radicals each bonded to a silicon atom, at least one organopolysiloxane resin B comprising OH group(s) bonded to silicone atoms, at least one organopolysiloxane extender CE having exactly two terminal-hydrogen atoms bonded to silicone atoms, optionally at least one organopolysiloxane crosslinker XL having at least three hydrogen atoms bonded to silicone atoms, at least one hydrosilylation catalyst D, at least one solvent E, and optionally at least one hydrosilylation inhibitor F, wherein the organopolysiloxanes A, CE and XL are selected such that the molar ratio RHAlk is from 2 to 5 and the ratio nHXL/nHCE is below 0.10.