Pressure Sensitive Adhesive With Nanoscale Hydrocolloid Particles
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Solution Overview
Problem
Traditional ostomy adhesives face challenges in maintaining skin dryness while being soft and having high water absorption capacity, as they require high loading of hydrocolloid particles, which makes them uncomfortable, and reducing particle load decreases absorption capacity and rate.
Innovation Solution
A pressure sensitive adhesive composition with a water vapour permeable hydrophobic polymer and low molecular weight water-soluble compound particles, allowing for high water absorption without particle leaching and maintaining adhesive softness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If hydrocolloid particles are mixed into adhesive matrix to absorb moisture, then skin dryness is maintained, but adhesive becomes hard and uncomfortable
Solution Approach 1:
The invention changes the particle size parameter of hydrocolloid particles from traditional large sizes to nanoscale dimensions (1-100 nm). This parameter change allows the particles to be dispersed throughout the adhesive matrix without aggregating, maintaining adhesive softness while providing effective moisture absorption. The nanoscale particles have sufficiently small dimensions that they do not create a hard, uncomfortable feeling on the skin.
Solution Approach 2:
The invention utilizes the porous structure of nanoscale hydrocolloid particles to absorb moisture from the skin. The high surface area to volume ratio of these nanoscale particles provides numerous absorption sites, enabling effective moisture management while the particles remain dispersed in the adhesive matrix rather than forming a hard, continuous absorbing layer.
2Quantity of substance
If loading of hydrocolloid particles is increased to improve water absorption capacity, then moisture handling ability is improved, but adhesive hardness increases and comfort decreases
Solution Approach 1:
The invention changes the size parameter of hydrocolloid particles to nanoscale dimensions, which fundamentally alters how the particles behave in the adhesive matrix. At this scale, particles can be present at high concentrations without aggregating or creating a hard texture. The nanoscale particles disperse uniformly throughout the adhesive, providing high water absorption capacity while maintaining the soft, comfortable characteristics of the adhesive.
Solution Approach 2:
The invention creates a composite adhesive material consisting of a hydrophobic adhesive matrix combined with nanoscale hydrocolloid particles. This composite structure leverages the water-repellent properties of the hydrophobic matrix while the dispersed nanoscale hydrocolloid particles provide moisture absorption capability. The composite nature allows both functions to coexist without compromising comfort.
3Ease of operation
If amount of absorbing particles is reduced to improve softness, then adhesive comfort is improved, but absorption capacity and rate are reduced
Solution Approach 1:
The invention changes the size parameter of hydrocolloid particles to nanoscale dimensions, which dramatically increases the surface area to volume ratio. This parameter change means that even at low weight percentages, the total surface area available for moisture absorption is very high. The nanoscale particles can be dispersed at low concentrations while still providing sufficient absorption capacity, thereby maintaining both comfort and absorption performance.
Solution Approach 2:
The nanoscale hydrocolloid particles possess a high degree of porosity and surface area relative to their mass. This porous structure at the nanoscale allows them to absorb moisture efficiently even when present in small amounts. The high surface area provides numerous absorption sites, compensating for the low particle loading and maintaining high absorption capacity while preserving adhesive softness.
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 adhesive achieves high water absorption capacity with low particle loading, maintaining skin dryness and comfort, with a consistent absorption rate and no reduction in erosion resistance.
Implementation Method 1
the continuous phase comprises a water vapour permeable hydrophobic polymer... which has a moisture vapour transmission rate greater than 20 g/m2/24h
Implementation Method 2
the discontinuous phase comprises water soluble compound particles... with a molecular weight below 200 g/mol
Implementation Method 3
Water absorption in the adhesive is driven by a difference in vapour pressure between the skin and the inside of the adhesive
Data Source
AI summary
The present invention relates to apressure sensitive adhesive composition comprising a continuous phase and a discontinuous phase wherein a) the continuous phase comprises a water vapour permeable hydrophobic polymer; and b) the discontinuous phase comprises a water soluble compound.