COMPOSITE FABRIC OF ISLAND-IN-SEA TYPE AND PROCESS FOR PRODUCING THE SAME

摘要

A composite fabric of the island-in-sea type which comprises a sea part containing a highly soluble polymer and 100 or more island parts containing a hardly soluble polymer. The island parts have a diameter of from 10 to 1000 nm and the distances between island parts adjacent to each other are 500 nm or less. This composite fabric is produced by melt-spinning the polymers of the sea and island parts as described above from a spinneret for composite fabrics of the island-in-sea type and drawing at a speed of from 400 to 6000 m/min. By dissolving and removing the sea part polymer from this composite fabric, it is possible to obtain fine fibers having a diameter of from 10 to 1000 nm and being useful in clothes, industrial materials and the like.