Fibrillated Fiber Network in Hydrocolloid Adhesive
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Solution Overview
Problem
Current hydrocolloid-containing adhesive compositions for medical dressings and skin-adhering devices face challenges in achieving sufficient moldability, resistance to cold flow, and maintaining high surface tack while ensuring wet integrity, as they often compromise on viscosity, cohesive strength, and shape retention.
Innovation Solution
Incorporating fibrillated polymeric fibers with a high surface area into a plastically moldable pressure-sensitive adhesive component, along with hydrocolloids, to create a three-dimensional network that enhances flowability, cohesive strength, and reduces cold flow, while maintaining high surface tack and wet integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If low viscosity pressure-sensitive adhesive is used to improve adhesion to skin and track movement, then adhesion and flexibility are improved, but cold flow increases and cohesive strength decreases
Solution Approach 1:
The patent uses a composite material system consisting of hydrocolloid particles dispersed in a pressure-sensitive adhesive matrix, with fibrillated polyethylene fibers forming a three-dimensional network structure. This composite approach allows the low viscosity adhesive to maintain skin adhesion while the fiber network provides cold flow resistance and cohesive strength.
Solution Approach 2:
The fibrillated fibers are distributed throughout the adhesive composition to create localized reinforcement zones. The fibers provide structural support and cold flow resistance in specific regions while allowing the adhesive matrix to maintain its low viscosity and adhesion properties at the skin interface.
2Ease of operation
If low viscosity pressure-sensitive adhesive is used to improve adhesion to skin and track movement, then adhesion and flexibility are improved, but cohesive strength decreases
Solution Approach 1:
The patent employs a composite material system where fibrillated polyethylene fibers are embedded in the pressure-sensitive adhesive matrix. The fibers form a three-dimensional network that provides cohesive strength and structural integrity, allowing the adhesive to remain low viscosity for skin adhesion while gaining enhanced cohesive properties.
Solution Approach 2:
The fibrillated fibers create localized reinforcement throughout the adhesive composition, providing cohesive strength where needed while allowing the adhesive matrix to maintain its low viscosity and flexibility for tracking skin movements.
3Quantity of substance
If high hydrocolloid content is used to increase liquid absorbency, then absorbency is improved, but cohesive strength and surface tack decrease
Solution Approach 1:
The patent uses a composite material system where fibrillated polyethylene fibers are integrated with hydrocolloid particles in a pressure-sensitive adhesive matrix. The fiber network provides a structural framework that maintains cohesive strength even at high hydrocolloid loadings, while the hydrocolloids retain their liquid absorbency function.
Solution Approach 2:
The fibrillated fibers are distributed throughout the adhesive composition to create localized reinforcement zones that maintain cohesive strength and surface tack, allowing high hydrocolloid content to be used for increased absorbency without compromising the structural integrity of the material.
4Quantity of substance
If high hydrocolloid content is used to increase liquid absorbency, then absorbency is improved, but moldability decreases
Solution Approach 1:
The patent employs a composite material system where fibrillated polyethylene fibers are dispersed in the adhesive matrix containing hydrocolloid particles. The fibers form a flexible three-dimensional network that maintains moldability by allowing the composition to flow and conform to skin contours, while the high hydrocolloid content provides enhanced absorbency.
Solution Approach 2:
The fibrillated fibers are distributed throughout the adhesive composition to create localized reinforcement that maintains structural integrity during molding, allowing the high hydrocolloid content composition to be molded to skin contours without compromising absorbency or creating excessive stiffness.
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 use of fibrillated polymeric fibers in hydrocolloid-containing adhesive compositions improves moldability, resistance to cold flow, and wet integrity, allowing for secure adhesion to skin surfaces and maintaining shape without shape memory, even when stretched, thus addressing the limitations of existing compositions.
Implementation Method 1
The fibrillated fibers have a high surface area for their weight (at least 4 square meters per gram (m2/g)) and function to retain liquid in the composition
Implementation Method 2
The fibrillated fibers have a high surface area for their weight (at least 4 square meters per gram (m2/g)) and function to retain liquid in the composition
Implementation Method 3
particles of one or more hydrocolloids dispersed throughout the adhesive as a liquid-absorbing and swellable discontinuous phase
Implementation Method 4
The surface tack may be modified by the addition of tackifier components
Implementation Method 5
pressure-sensitive adhesive as a continuous phase with particles of one or more hydrocolloids dispersed throughout the adhesive
Data Source
AI summary
Hydrocolloid-containing pressure-sensitive adhesive compositions for medical use are disclosed which contain networks of fibrillated polymeric fibers that have surface areas of at least 4 square meters per gram and which have superior properties of low cold flow and high cohesive strength.