Adhesive Composition for Skin-Mounted Fluid Collection
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Solution Overview
Problem
Adhesive compositions for body fluid collection bags face issues with rigidity, skin irritation, and leakage due to the use of certain polymers and hydrocolloids, leading to discomfort and reduced flexibility.
Innovation Solution
An adhesive composition with a reduced quantity of hydrocolloids (25-45%) and an increased quantity of adhesive agents, particularly high activity terpene resins, along with a block copolymer of styrene-isoprene-styrene type and a reinforcing polymer, to enhance adhesiveness and flexibility while minimizing skin irritation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high quantities of hydrocolloids (45-52%) are used in the adhesive composition, then absorption capacity is improved, but the composition becomes too rigid and loses flexibility
Solution Approach 1:
The patent changes the key parameter from hydrocolloid content to adhesive agent content (specifically terpene resins). By reducing hydrocolloids to 25-45% and increasing adhesive agents to 22-40%, the composition achieves both adequate absorption and improved flexibility, resolving the rigidity problem while maintaining absorption capacity.
Solution Approach 2:
The patent creates a composite adhesive system combining block copolymers (styrene-isoprene-styrene or styrene-butadiene-styrene) with terpene resins and plasticizers. This composite material provides the necessary balance between structural integrity for absorption and flexibility for comfort, eliminating the need for excessive hydrocolloid content.
2Shape
If block copolymers of styrene-isoprene-styrene type are used as the only texture polymer, then texture properties are improved, but the composition becomes rigid and reduces comfort
Solution Approach 1:
The patent modifies the polymer composition parameters by introducing terpene resins (22-40%) and plasticizers (10-30%) in combination with block copolymers. This parameter change transforms the texture properties while simultaneously improving flexibility and comfort, preventing the rigidity issue associated with block copolymer-only formulations.
3Strength
If polybutenes are used as the continuous phase, then adhesiveness is improved, but dissolution and disintegration occur leading to leakage
Solution Approach 1:
The patent changes the continuous phase composition from polybutene-based to block copolymer-based (styrene-isoprene-styrene or styrene-butadiene-styrene) with added terpene resins. This parameter change maintains strong adhesiveness while providing resistance to dissolution and disintegration, eliminating the leakage problem.
Solution Approach 2:
The patent creates a composite continuous phase combining block copolymers with terpene resins and plasticizers. This composite structure provides both the adhesiveness needed for secure bonding and the structural stability to resist dissolution, preventing leakage while maintaining strong attachment.
4Strength
If adhesive compositions are made with thickness of around 3 mm to ensure necessary properties, then adhesiveness and ease of installation are improved, but flexibility and comfort are reduced
Solution Approach 1:
The patent changes the compositional parameters by increasing adhesive agent content (22-40%) and optimizing plasticizer content (10-30%). This allows the adhesive to achieve necessary strength at reduced thickness, improving flexibility and comfort while maintaining adequate adhesiveness for secure bonding.
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 composition provides improved flexibility, reduced skin irritation, and enhanced adhesiveness, allowing for easier installation and removal of body fluid collection bags, improving patient comfort and reducing the likelihood of leakage.
Implementation Method 1
The continuous phase contains 5 to 10% of a texture copolymer consisting of a block copolymer of the styrene-isoprene-styrene or styrene-butadiene-styrene type having a majority of triple sequences
Implementation Method 2
The adhesive composition contains more than 22% of adhesive agent, in particular adhesive agents having particularly strong adhesive properties, such as terpene resins
Implementation Method 3
The adhesive composition contains 10 to 30% of a plasticizer
Implementation Method 4
The adhesive composition contains 25 to 45% of a discontinuous phase consisting of hydrophilic polymers in the form of hydrocolloids
Data Source
AI summary
The invention relates to an adhesive composition containing 55 to 75 % of a continuous phase and 25 to 45 % of a discontinuous phase constituted of hydrophilic polymers in the form of hydrocolloids, the continuous phase containing 5 to 10 % of a textured copolymer constituted of a styrene-isoprene-styrene or styrene-butadiene-styrene sequence copolymer having a majority of at least triple sequences, more than 22 % of a tackifying agent, and 10 to 30 % of a plasticizer, these percentages being indicated with regard to the whole of the composition. The tackifying agent is a mixture of tackifying agents that contain a majority of high-activity tackifying agents based on terpene resins, and a significant quantity of a tackifying agent with a low activity of adhesiveness but having reinforcing properties. At least half of the tackifying agent is constituted of a high-activity tackifying agent based on terpene resin such as a terpene-styrene polyterpene resin. The invention is for use in attaching pockets for collecting body fluids to human skin.