Polydiorganosiloxane Polyamide Multi-Component Fibers
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Solution Overview
Problem
Existing fiber technologies lack materials with high thermal stability, low surface energy, and excellent adhesive properties suitable for nonwoven webs, particularly for applications requiring breathability and adhesion to irregular surfaces.
Innovation Solution
Development of multi-component fibers comprising a polydiorganosiloxane polyamide copolymer as the outer layer and a second melt processable polymer core, which are processed using melt-blowing to create microfibers with high shear adhesion holding power and pressure-sensitive adhesive properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polydiorganosiloxane polyamide copolymer is used as the outer layer, then adhesive properties and thermal stability are improved, but melt processability and fiber formation become more difficult
Solution Approach 1:
The invention uses a multi-component fiber structure where the outer layer is composed of a polydiorganosiloxane polyamide copolymer blend containing both polar and nonpolar components. This composite approach allows the material to exhibit enhanced adhesive properties from the polar polyamide segments while the nonpolar segments provide melt processability and fiber formation characteristics, resolving the contradiction between adhesive performance and manufacturability.
2Adaptability or versatility
If the fiber structure is made more complex with multiple components, then adhesion to irregular surfaces is improved, but manufacturing complexity increases
Solution Approach 1:
The invention applies local quality by creating a multi-component fiber structure where specific segments of the fiber have specific properties. The outer layer contains polydiorganosiloxane polyamide copolymer with both polar (for adhesion) and nonpolar (for processability) components, while the core may contain different polymers. This localized differentiation of material properties within the fiber structure enables adhesion to irregular surfaces without requiring complex external processing or multiple separate components.
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 resulting nonwoven webs exhibit high surface area, porosity, breathability, and excellent adhesion characteristics with reduced adhesion build over time, making them suitable for various applications including medical articles and skin contact.
Implementation Method 1
melt-blowing the composition to form a fibrous web
Implementation Method 2
a complex viscosity ranging from 500 to 5000 poise at a temperature ranging from 200° C. to 300° C. and a shear rate of 1 hertz
Data Source
AI summary
The present invention pertains to nonwoven webs, and multi-component fibers comprising polydiorganosiloxane polyamide as well as method of making microfibers and multi-component fibers comprising a polydiorganosiloxane polyamide copolymer.