Production of fine fibrous structures
Abstract
Abstract AN AQUEOUS EMULSION CONTAING A LINEAR POLYMER AND A SOLVENT POSITIVE RELATIVE TO THE POLYMER IS EJECTED FROM A REGION AT A TEMPERATURE HIGHER THAN THAT AT WHICH THE POLYMER IS AT LEAST CAUSED TO SWELL IN THE EMULSION BUT LOWER THAN THE CRITICAL TEMPERATURE OF THE EMULSION, AND AT A PRESSURE HIGHER THAN THE SATURATED VAPOR PRESSURE OF THE EMULSION, INTO A LOW-PRESSURE REGION AT A TEMPERATURE AND PRESSURE ENABLING THE LIQUID PHASE WHICH HAS INFILTRATED INTO DROPLETS OF THE POLYMER IN THE EMULSION TO VAPORIZE, THEREBY PRODUCING A FINE FIBROUS STRUCTURE. THE WEIGHT RATIO OF THE SOLVENT TO THE POLYMER IS GREATER THAN UNITY, AND THE DROPLETS CONTAIN A WATER-SORPTION AGENT IN A QUANITY OF FROM ZERO TO 80 PRECENT OF THE WEIGHT OF THE POLYMER.
Inventors
- 👤 S Ueki
- 👤 T Fukada
Bibliographic Details
Claims Analysis
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