Adhesive Backing with Direct Film-Nonwoven Bond

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Solution Overview

Problem

Adhesive patches with film and nonwoven fabric laminated using a binder face issues with flexibility, skin irritation, and stability due to binder rigidity and potential drug-binder reactions, leading to separation and drug deterioration.

Innovation Solution

A backing comprising a polyester film and nonwoven fabric directly bound without a binder, with the pressure-sensitive adhesive layer laminated on the nonwoven fabric side, enhancing flexibility, reducing skin irritation, and preventing binder-related issues.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a binder is used to laminate film and nonwoven fabric, then anchoring between layers is improved, but flexibility and compliance to skin surface movements deteriorate

Engineering Contradiction:

Improveanchoring between film and nonwoven fabricVSAvoidflexibility and compliance to skin surface movements

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

The patent removes the binder from the laminate structure entirely, achieving the desired flexibility by eliminating the rigid component that compromised skin compliance, while alternative bonding methods maintain layer attachment

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the bonding mechanism from chemical/adhesive (binder) to physical/thermal (heat bonding), fundamentally altering how layers are joined to eliminate flexibility issues while maintaining structural integrity

Inventive Principle:

Principle #35Parameter changes

2Strength

If a binder is used in the backing structure, then layer bonding is improved, but skin irritation increases due to edge thickness

Engineering Contradiction:

Improvebonding between film and nonwoven fabricVSAvoidskin irritation from edge thickness

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The binder is completely removed from the structure, eliminating the source of edge thickness and subsequent skin irritation while maintaining layer bonding through alternative means

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent employs thin film structures that inherently minimize edge thickness and reduce skin irritation potential while maintaining sufficient structural integrity without requiring thick binders

Inventive Principle:

Principle #30Flexible shells and thin films

3Strength

If a binder is used in the backing, then layer anchoring is improved, but drug stability deteriorates due to potential drug-binder reactions

Engineering Contradiction:

Improveanchoring between film and nonwoven fabricVSAvoiddrug stability

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The binder is removed to eliminate chemical interactions that could degrade drug stability, with layer bonding achieved through heat bonding or other non-reactive methods

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces heat as an intermediary bonding mechanism instead of chemical adhesives, creating a physical bond that does not chemically interact with or deteriorate the drug

Inventive Principle:

Principle #24Intermediary (Mediator)

4Reliability

If organic solvent is used in pressure-sensitive adhesive solution, then adhesive performance is improved, but binder deterioration occurs leading to separation

Engineering Contradiction:

Improveadhesive performanceVSAvoidbond between film and nonwoven fabric

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent eliminates the binder that is vulnerable to organic solvent deterioration, allowing direct laminate construction where the adhesive layer bonds to the nonwoven fabric without compromising the film-layer bond

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent accepts that the adhesive layer may have limited service life due to solvent exposure, but this does not affect the permanent film-nonwoven fabric bond structure, effectively separating the temporary adhesive function from the permanent structural bond

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 flexible adhesive preparation with reduced skin irritation, improved anchoring, and enhanced stability by eliminating binder-related problems, allowing for various drug applications and flexible manufacturing processes.

Implementation Method 1

a backing comprising a polyester film and nonwoven fabric directly bound without a binder

Methodology Applied

Scientific EffectHeat bonding: Heating

Implementation Method 2

a pressure-sensitive adhesive layer which contains a drug and is laminated on at least one side of the backing

Methodology Applied

Scientific EffectAdhesion: Adhesive

Data Source

PatentEP1925300B1Adhesive preparation

Publication Date: 2010.11.17 NITTO DENKO CORP

AI summary

The invention provides an adhesive preparation including a backing, and a pressure-sensitive adhesive layer which contains a drug and is disposed on at least one side of the backing; in which the backing includes a polyester film having a thickness of 0.5 to 6.0 µm, and a polyester nonwoven fabric directly bound to the film. The pressure-sensitive adhesive layer preferably is directly or indirectly laminated on the nonwoven-fabric side of the backing. The adhesive preparation of the invention is flexible enough to comply to the skin and has reduced skin irritation and high stability.