Medical Silicone Laminate Curing for Uniform Crosslinking and Release

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Solution Overview

Problem

Existing methods for preparing crosslinked silicones used in medical applications face issues such as non-homogeneous crosslinking, poor adhesive properties, high energy consumption, chemical contamination, and difficulties in removing release liners without damaging the laminate, leading to adhesive residues and production inefficiencies.

Innovation Solution

A method involving the use of siloxane prepolymers, blending with catalysts, and subjecting the mixture to infrared radiation to achieve homogeneous crosslinking and controlled adhesive properties, reducing chemical inhibitions and energy use.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If crosslinking is conducted in a common convection oven with hot air stream, then curing acceleration is achieved, but non-homogeneous crosslinking and poor cohesion in top surface occur

Engineering Contradiction:

Improvecuring speedVSAvoidcrosslinking homogeneity

Core Design Contradiction:

SpeedVSManufacturing precision

Solution Approach 1:

The patent replaces the conventional convection oven heating system with an infrared radiation system. This substitution enables rapid and homogeneous crosslinking of the silicone adhesive layer without creating temperature gradients or surface depolymerization, thereby achieving both fast curing speed and uniform crosslinking quality throughout the material thickness.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the heating parameter from convective hot air heating to infrared radiation heating. This parameter change allows the energy to be absorbed directly by the silicone material molecules, producing rapid and uniform crosslinking throughout the adhesive layer without the temperature gradients that occur with conventional convection heating.

Inventive Principle:

Principle #35Parameter changes

2Speed

If hot air stream is used for curing, then crosslinking acceleration is achieved, but chemical contamination and catalyst inhibition occur

Engineering Contradiction:

Improvecrosslinking speedVSAvoidchemical contamination

Core Design Contradiction:

SpeedVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the chemical-based convection heating system with a physical infrared radiation system. This eliminates the introduction of combustion byproducts and chemical contaminants into the silicone adhesive, while still achieving rapid crosslinking through direct molecular energy absorption from infrared radiation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If conventional convection oven curing is used, then crosslinking is achieved, but high energy consumption occurs

Engineering Contradiction:

Improvecrosslinking completionVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent substitutes the energy-intensive convection oven system with an infrared radiation system. The infrared radiation is directly absorbed by the silicone molecules, converting electromagnetic energy directly into chemical bond energy for crosslinking, thereby significantly reducing overall energy consumption while ensuring complete and reliable crosslinking.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Reliability

If conventional curing methods are used, then crosslinking is achieved, but adhesive residues remain on release liner

Engineering Contradiction:

Improvecrosslinking completionVSAvoidadhesive residues

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent replaces conventional gradual heating methods with rapid infrared radiation curing. This rapid crosslinking process completes the curing reaction before adhesive migration to the release liner can occur, eliminating adhesive residues on the liner while ensuring complete crosslinking of the adhesive layer.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent applies preliminary infrared radiation curing to the silicone adhesive before it can migrate to the release liner. This preliminary action completes the crosslinking process in advance, preventing subsequent adhesive migration and residue formation on the liner surface.

Inventive Principle:

Principle #10Preliminary action

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 method results in a laminate with uniform viscoelastic properties, stable adhesion to skin, and controlled release from liners, minimizing adhesive residues and improving production efficiency.

Implementation Method 1

subjecting the mixture resulting from step (ii) to infrared (IR) radiation

Methodology Applied

Scientific EffectInfrared radiation: Infrared Radiation

Implementation Method 2

providing siloxane prepolymers and a catalyst, blending the compounds

Methodology Applied

Scientific EffectCatalysis: Catalysis

Data Source

PatentEP4686485A1Method for the preparation of a laminate comprising a substrate and a crosslinked adhesive medical silicone

Publication Date: 2026.02.04 ADVANCED SILICONE COATING

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AI summary

The invention relates to a new method for preparing a laminate showing advantageous properties when being adhered to a surface such as skin and/or when being removed from a release liner. The laminate can for example be used as a wound contact layer for the preparation of articles such as wound dressings which are used for promoting/supporting the process of the healing of a wound.