Addition-Curable Silicone Adhesive for Skin Patches
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Solution Overview
Problem
Existing silicone adhesives for skin application face challenges with adhesive strength retention over time and upon re-attachment, leading to discomfort and irritation, while also lacking reworkability and durability.
Innovation Solution
An addition-curable silicone adhesive composition comprising a specific mixture of diorganopolysiloxanes, organohydrogenpolysiloxanes, and a platinum group metal-based catalyst, optimized to maintain suitable adhesive strength and prevent adhesive strength degradation upon re-attachment, with a balanced ratio of components ensuring cohesion and reworkability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If silicone adhesives are crosslinked using peroxide and platinum catalyst, then cohesion is sufficient, but adhesive strength and suitability for skin application are lowered
Solution Approach 1:
The patent changes the crosslinking parameters by using organometallic catalysts (aluminum, boron, or silicon compounds) instead of traditional peroxide-platinum systems, and controls the water content at 0.01-5% to optimize the balance between cohesion and adhesive strength for skin application
Solution Approach 2:
The patent creates a composite adhesive system combining organometallic catalysts with specific silicone adhesive formulations, where the catalyst system and adhesive matrix work together to achieve both sufficient cohesion and appropriate adhesive strength for skin use
2Reliability
If silicone adhesives are used without crosslinking, then adhesive strength is maintained, but cohesion becomes insufficient causing adhesive to remain on skin surface
Solution Approach 1:
The patent introduces controlled crosslinking parameters by limiting water content to 0.01-5% and using organometallic catalysts, transforming the non-crosslinked system into a partially crosslinked network that achieves sufficient cohesion while preserving adhesive strength
3Force
If adhesive strength is high for skin attachment, then initial bonding is strong, but skin keratin is excessively removed causing pain and secondary inflammation
Solution Approach 1:
The patent optimizes the adhesive strength parameters by controlling crosslinking degree through water content (0.01-5%) and catalyst selection, achieving a balance where the adhesive is strong enough for attachment but gentle enough to avoid excessive keratin removal and skin irritation
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 achieves stable adhesive strength to human skin, suppresses adhesive strength decrease upon re-attachment, and exhibits excellent reworkability and durability, reducing skin irritation and discomfort.
Implementation Method 1
an organohydrogenpolysiloxane (C) and a platinum group metal-based catalyst (D)
Implementation Method 2
a mixture of the following component (A) with the following component (B), or a condensation reaction product between the following component (A) and the following component (B)
Data Source
AI summary
The present invention provides an addition-curable silicone adhesive composition for skin application, containing: (X) a mixture or condensation reaction product of a component (A) and a component (B); (C) an organohydrogenpolysiloxane containing three or more SiH groups per molecule; and (D) a platinum group metal-based catalyst. (A) is a diorganopolysiloxane with a mass ratio of (A1)/(A2) being 90/10 to 15/85. (A1) is a diorganopolysiloxane which has two or more alkenyl groups per molecule, and the alkenyl group-content is at least 0.0005 mol/100 g and less than 0.15 mol/100 g. (A2) is a diorganopolysiloxane having a SiOH group at a terminal and no alkenyl group. (B) is an organopolysiloxane with a molar ratio of R13SiO0.5 unit/SiO2 unit being 0.5 to 1.5. This addition reaction-curable silicone adhesive composition for skin application results in an adhesive layer which has suitable adhesive strength and excellent re-attachability, reworkability, and durability.