Silyl Polymer Adhesive for Waterproof Breathable Articles

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Solution Overview

Problem

Existing adhesive compositions for self-adhesive articles, particularly in medical applications, face challenges in providing improved water-vapor permeability without compromising adhesion, leading to skin or wound maceration and delayed healing.

Innovation Solution

A composition comprising a silyl polymer with hydrolyzable alkoxysilane groups, a polyvinyl ether compound, and a curing catalyst, which enhances water-vapor permeability while maintaining strong adhesion properties, suitable for prolonged use on skin or wounds.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If existing adhesive compositions are used to ensure strong adhesion, then adhesion strength is improved, but water-vapor permeability deteriorates leading to skin maceration

Engineering Contradiction:

Improveadhesion strengthVSAvoidskin maceration

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The adhesive composition uses a composite system combining polyvinyl ether compound (providing adhesion), silyl polymer with hydrolyzable alkoxysilane groups (providing water-vapor permeability and crosslinking), and curing catalyst (enabling crosslinking reaction). This composite material approach allows simultaneous achievement of strong adhesion and high water-vapor permeability, preventing skin maceration while maintaining bond strength.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The invention changes the chemical structure parameters of the adhesive by incorporating silyl polymer with hydrolyzable alkoxysilane groups that can crosslink upon contact with moisture. This parameter change enables the adhesive to maintain strong bonding while creating a breathable network structure that permits water-vapor transmission, thus preventing skin maceration.

Inventive Principle:

Principle #35Parameter changes

2Duration of action of stationary object

If existing adhesive compositions are used for prolonged application, then adhesion is maintained, but water-vapor permeability is insufficient causing delayed wound healing

Engineering Contradiction:

Improveprolonged application durationVSAvoiddelayed wound healing

Core Design Contradiction:

Duration of action of stationary objectVSObject-affected harmful factors

Solution Approach 1:

The adhesive composition combines polyvinyl ether compound for sustained adhesion with silyl polymer containing hydrolyzable alkoxysilane groups that provide water-vapor permeability. The curing catalyst enables crosslinking to maintain adhesion over time while the silane groups create pathways for moisture vapor transmission, allowing prolonged wound dressing application without delaying healing through moisture accumulation.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The silyl polymer with hydrolyzable alkoxysilane groups forms a crosslinked network structure that inherently provides porosity and channels for water-vapor transmission. This porous structure allows the adhesive to maintain strong bonding over prolonged periods while simultaneously enabling high moisture vapor transmission rate necessary for wound healing.

Inventive Principle:

Principle #31Porous materials

3Object-affected harmful factors

If high MVTR is achieved in adhesive compositions, then skin maceration is prevented, but adhesion strength may be compromised

Engineering Contradiction:

Improveskin maceration preventionVSAvoidadhesion strength

Core Design Contradiction:

Object-affected harmful factorsVSStrength

Solution Approach 1:

The adhesive composition uses a synergistic composite where polyvinyl ether compound provides the adhesive matrix for strong bonding, while silyl polymer with hydrolyzable alkoxysilane groups provides the water-vapor permeable network. The curing catalyst enables crosslinking that strengthens the adhesive bonds while the silane structure maintains breathability, thus achieving both high MVTR and strong adhesion simultaneously.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The invention changes the physical-chemical parameters by incorporating crosslinkable silyl groups that form a three-dimensional network. This structural parameter change allows the adhesive to achieve high crosslinking density for strong adhesion while the hydrolyzable alkoxysilane groups create hydrophilic pathways for water-vapor transmission, maintaining high MVTR without sacrificing bond strength.

Inventive Principle:

Principle #35Parameter changes

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 improved water-vapor permeability and stable adhesion, preventing maceration and facilitating wound healing, making it suitable for medical and construction applications.

Implementation Method 1

at least one silyl polymer comprising at least one hydrolyzable alkoxysilane group

Methodology Applied

Scientific EffectHydrolysis: Hydrolysis

Data Source

PatentUS20230272253A1Adhesive composition for making waterproof breathable articles

Publication Date: 2023.08.31 BOSTIK SA(FR)

AI summary

The invention relates to an adhesive composition comprising at least one silyl polymer comprising at least one hydrolyzable alkoxysilane group; at least one polyvinyl ether compound; and at least one curing catalyst, and also to the use of said composition as an adhesive and also to self-adhesive articles comprising at least one support layer and at least one layer of said composition.