Polyolefin Dispersion Coating for Breathable Porous Substrates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for forming breathable articles, such as gloves, fail to provide a balance between breathability, moisture resistance, and comfort, often leading to issues like skin irritation and discomfort due to trapped perspiration, and existing technologies struggle to create economically viable, flexible, and powder-free disposable gloves with elastomeric fiber-layers.
Innovation Solution
A method involving the application of an aqueous polyolefin dispersion to a porous substrate, which includes a thermoplastic polymer, a dispersing agent, and water, followed by removal of water, to create breathable structures with controlled porosity and mechanical properties, allowing for the use of various coating techniques and the incorporation of elastic nonwoven materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastic polymer latex or other elastic polymer membranes are used as barrier layers, then barrier properties against fluids, chemicals, and pathogens are improved, but skin breathability deteriorates causing perspiration trapping and discomfort
Solution Approach 1:
The patent applies porous polymeric foam materials as the barrier layer in protective articles. These foams contain interconnected voids or cells that allow vapor transmission while blocking liquid penetration. The porous structure enables skin breathability by allowing perspiration vapor to escape, eliminating the trapping effect caused by conventional solid elastic polymer membranes while maintaining fluid and chemical barrier properties.
2Ease of operation
If woven or knit fabric liners are used in protective articles, then comfort and flexibility are improved, but barrier properties against fluids and chemicals deteriorate
Solution Approach 1:
The patent creates a composite structure combining an open-celled polymeric foam barrier layer with a fabric liner layer. The foam layer provides the necessary barrier properties against fluids and chemicals, while the fabric liner delivers comfort and flexibility. The composite design allows each layer to fulfill its specific function without compromising the other, solving the contradiction between protection and comfort.
3Duration of action of stationary object
If thick liners are used in gloves made by conventional dipping processes, then durability is improved, but flexibility deteriorates and fit becomes loose
Solution Approach 1:
The patent replaces thick solid liners with thin porous polymeric foam layers that provide equivalent or superior durability through their cellular structure. The foam material achieves high strength-to-weight ratio and durability while maintaining flexibility and conforming closely to the hand shape, eliminating the looseness and stiffness associated with thick conventional liners.
4Ease of manufacture
If conventional dipping processes are used to fabricate gloves, then manufacturing simplicity is maintained, but product quality and fit deteriorate due to flat mould limitations
Solution Approach 1:
The patent employs dynamic molding processes that allow the glove material to flow and conform to the three-dimensional contours of the hand during formation. This enables the production of gloves with superior fit and comfort that accurately follow hand anatomy, replacing the static flat mould approach while maintaining manufacturing efficiency through automated processes.
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 method results in breathable coated articles that are moisture-resistant and comfortable to wear, addressing the challenges of breathability, moisture management, and skin protection while being economically viable for disposable applications.
Implementation Method 1
removing at least a portion of the water
Data Source
AI summary
A method of forming an article that includes applying an aqueous dispersion to a porous substrate, wherein the aqueous dispersion includes a thermoplastic polymer, a dispersing agent, and water. The method includes removing at least a portion of the water, to result in an article formed that is breathable.