Adhesive Laminate with Segmented Hydrocolloid Layers

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Solution Overview

Problem

Conventional skin adhesives face challenges in maintaining adhesive tack and absorbency when exposed to moisture, as high hydrocolloid content leads to swelling and reduced adhesion, while low hydrocolloid content results in low absorbency and permeability.

Innovation Solution

A layered adhesive laminate with a skin-facing adhesive layer having a low hydrocolloid content and a separate absorbent bulk layer, where the hydrocolloid particles are sized such that their ratio to the adhesive thickness allows for effective water transport and absorption without compromising adhesion, even under moist conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If high hydrocolloid content is used in skin adhesive, then absorbency and permeability are improved, but adhesive tack is reduced due to swelling

Engineering Contradiction:

ImproveabsorbencyVSAvoidadhesive tack

Core Design Contradiction:

Quantity of substanceVSStrength

Solution Approach 1:

The adhesive laminate is divided into two distinct layers: a first adhesive layer in direct contact with skin containing low hydrocolloid content to maintain adhesive tack, and a second bulk layer containing high hydrocolloid content to provide absorbency. This segmentation allows each layer to optimize its function without compromising the other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the adhesive laminate have different compositions tailored to their specific functions. The skin-contacting layer has low hydrocolloid content (5-20% w/w) for strong adhesion, while the bulk layer has high hydrocolloid content (30-60% w/w) for maximum absorbency. Each layer's quality is optimized for its local role.

Inventive Principle:

Principle #3Local quality

2Strength

If low hydrocolloid content is used in skin adhesive, then adhesive tack is maintained, but absorbency and permeability are reduced

Engineering Contradiction:

Improveadhesive tackVSAvoidabsorbency

Core Design Contradiction:

StrengthVSQuantity of substance

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention combines two adhesive layers with different hydrocolloid contents into a single functional unit. The first layer provides adhesion while the second layer provides absorbency, and together they form an integrated adhesive laminate that delivers both properties simultaneously.

Inventive Principle:

Principle #5Merging (Combining)

3Ease of manufacture

If hydrocolloid particles are large, then manufacturing is easier, but water transport and absorption efficiency are reduced

Engineering Contradiction:

Improvemanufacturing easeVSAvoidwater transport efficiency

Core Design Contradiction:

Ease of manufactureVSSpeed

Solution Approach 1:

The invention specifies a particular particle size range for hydrocolloid particles (D90 < 290 μm) and optimizes the ratio of adhesive layer thickness to particle size (L/D90 = 0.4-2.5). This parameter optimization ensures efficient water transport through the adhesive layer while maintaining manufacturability.

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 maintains adhesive properties and high water uptake capacity, preventing maceration and ensuring effective skin adhesion even under prolonged exposure to bodily fluids and perspiration.

Implementation Method 1

the bulk layer is essentially free from oil, such as paraffin oil... the skin-facing adhesive layer comprises hydrocolloid particles... maintains adhesive properties and high water uptake capacity

Methodology Applied

Scientific EffectAbsorption: Absorption (physical)

Implementation Method 2

a first, skin-facing adhesive layer... ensuring effective skin adhesion even under prolonged exposure to bodily fluids and perspiration

Methodology Applied

Scientific EffectAdhesion: Adhesive

Data Source

PatentEP4157167B1An adhesive laminate, a pressure sensitive adhesive wafer, an ostomy appliance and an urostomy device

Publication Date: 2024.05.29 COLOPLAST AS

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AI summary

An adhesive laminate for application to skin, the laminate comprising a first, skin-facing adhesive layer and a second absorbent bulk layer. The skin-facing adhesive layer has a first proximal/skin-facing surface and a second distal surface and the bulk layer is provided on the second distal surface of the skin-facing adhesive layer. The skin-facing adhesive comprises hydrocolloid particles having a particle size D90 being less than 290µm and the skin-facing adhesive layer has a first thickness L and the ratio L/D90 is between 0.4-2.5.