Adhesive Barrier Layer Prevents Plasticizer Migration

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Plasticizer migration from bonded rubber seals into pressure-sensitive adhesives compromises adhesive performance, leading to reduced adhesion and cohesion issues in foam tapes, especially during heat aging, as existing barrier solutions are inadequate in preventing permeation.

Innovation Solution

A multilayer adhesive article with a heat-bondable layer and an internal barrier layer substantially impermeable to oxygen and plasticizers, which is fused to a thermoplastic elastomer seal, preventing plasticizer migration and maintaining adhesive performance under heat aging.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single-layer polyolefin-based heat activatable adhesive layer is used, then good heat bondability is achieved, but resistance to plasticizer migration deteriorates

Engineering Contradiction:

Improveadhesive layer structureVSAvoidresistance to plasticizer migration

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent applies composite materials by creating a multilayer film structure comprising a polyolefin layer (for heat bondability), a barrier layer (for plasticizer resistance), and an adhesive layer (for bonding performance). This composite structure resolves the contradiction by combining materials with complementary properties that a single-layer system cannot provide.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent segments the adhesive system into distinct functional layers: a heat-bondable polyolefin layer, a plasticizer-barrier layer, and an adhesive layer. This segmentation allows each layer to specialize in one function, preventing plasticizer migration while maintaining heat bondability and adhesive performance.

Inventive Principle:

Principle #1Segmentation

2Strength

If block copolymer-based PSAs are used to improve adhesion to target substrates, then adhesion performance is improved, but plasticizer permeation worsens

Engineering Contradiction:

Improveadhesion to target substrateVSAvoidplasticizer permeation

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The barrier layer acts as an intermediary between the block copolymer PSA and the plasticizer source, blocking the harmful plasticizer permeation while allowing the PSA to maintain its adhesion function. This intermediary layer resolves the contradiction by protecting the adhesive system from plasticizer contamination.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent uses a composite structure where the block copolymer PSA is combined with a barrier layer material that provides plasticizer resistance. This composite approach allows the system to simultaneously achieve high adhesion strength and resistance to plasticizer permeation.

Inventive Principle:

Principle #40Composite materials

3Strength

If adhesive layer is disposed between plasticizer source and barrier layer, then adhesion is maintained, but plasticizer protection deteriorates

Engineering Contradiction:

ImproveadhesionVSAvoidplasticizer protection

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent applies local quality by positioning the barrier layer in direct contact with the plasticizer source (rubber seal), creating a localized protection zone at the critical interface. The adhesive layer is positioned on the opposite side, allowing each layer to perform its specialized function without compromising the other.

Inventive Principle:

Principle #3Local quality

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 effectively prevents plasticizer migration, maintaining adhesive strength and resistance to heat aging, thus ensuring consistent performance in industrial applications like automotive sealing.

Implementation Method 1

the barrier layer being substantially impermeable to oxygen gas at ambient temperature and pressure

Methodology Applied

Scientific EffectPermeation barrier: Permeation

Implementation Method 2

an internal barrier to plasticizers... The internal barrier layer prevents migration of plasticizer from the bonded rubber seal into the tape

Methodology Applied

Scientific EffectPhysical containment: Physical Containment

Implementation Method 3

heat-bondable layer... which is fused to a thermoplastic elastomer seal... heat bondable layer comprised of a multilayer film

Methodology Applied

Scientific EffectThermal bonding: Heating

Data Source

PatentUS11028289B2Adhesive article with a barrier layer

Publication Date: 2021.06.08 3M INNOVATIVE PROPERTIES CO

AI summary

Provided are adhesive articles that include a barrier layer that is substantially impermeable to oxygen gas at ambient temperature and pressure along with a heat-bondable layer, which could be a discrete layer adjacent to the barrier layer or integral with the barrier layer. The adhesive article further includes a backing extending across and coupled to the barrier layer and an adhesive layer extending across and coupled to the backing opposite the barrier layer. The barrier layer reduces or eliminates migration of plasticizers from the bonded seal into the adhesive article, limiting deterioration of tape performance over time.