Segmented Copolymer Tie Layer for Silicone Adhesive Bonding

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Solution Overview

Problem

Silicone adhesive tapes face issues with delamination from the tape backing, leading to difficulties in removing the product from skin without leaving residue, due to bond failures between the tape backing and the tie layer or the silicone adhesive.

Innovation Solution

Incorporating a segmented copolymer tie layer with a polyether or polysiloxane segment, having a water absorbency of less than 13% and a Tendotherm-Tg of at least 52°C, to enhance bonding with the silicone adhesive and prevent delamination.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If silicone adhesive is used for skin application, then adhesion to skin and gentle removal are improved, but delamination from tape backing occurs

Engineering Contradiction:

Improveadhesion to skinVSAvoidbond stability between adhesive and backing

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

A tie layer comprising a segmented copolymer is introduced as an intermediary between the silicone adhesive and the tape backing. This tie layer has specific properties (water absorbency less than 13%, Tendotherm-Tg of at least 52°C) that enable it to bond effectively to both the silicone adhesive and the backing, preventing delamination while maintaining the desirable skin adhesion properties of the silicone adhesive.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The adhesive article is constructed as a composite structure with multiple layers: the tape backing, the tie layer comprising segmented copolymer, and the silicone adhesive layer. Each layer contributes specific properties, and their combination creates a system that overcomes the delamination issue while preserving the beneficial characteristics of silicone adhesive for skin application.

Inventive Principle:

Principle #40Composite materials

2Reliability

If tie layer with high water absorbency is used, then bonding to skin is improved, but bond failure between tie layer and silicone adhesive occurs

Engineering Contradiction:

Improvebonding to skinVSAvoidbond strength between tie layer and adhesive

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The water absorbency parameter of the tie layer is precisely controlled to be less than 13%, and the Tendotherm-Tg is set to at least 52°C. These parameter optimizations ensure that the tie layer maintains sufficient bonding capability to skin while preventing bond failure with the silicone adhesive, resolving the contradiction between skin bonding and adhesive bonding 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 solution provides a stable adhesive article with reliable adhesion anchorage, ensuring that the silicone adhesive remains bonded to the tie layer during use and removal, reducing residue and skin trauma.

Implementation Method 1

The segmented copolymer has a water absorbency of less than about 13%

Methodology Applied

Scientific EffectAbsorption: Absorption (physical)

Data Source

PatentUS12163071B2Tie layer chemistry to promote bonding with silicone adhesive

Publication Date: 2024.12.10 3M INNOVATIVE PROPERTIES CO

AI summary

An adhesive article including a tie layer and a silicone adhesive is disclosed. The tie layer includes a segmented copolymer having a first segment that is one of (a) a polyether comprising one of PTMO or PEO/PPO or (b) a polysiloxane. The segmented copolymer has a water absorbency of less than about 13%.