YARN FROM POLYMERS HAVING DIFFERENT DECOMPOSITION TEMPERATURES AND PROCESS FOR FORMING SAME

摘要

This invention relates to a yarn, and a process for making the yarn, the yarn comprising a plurality of spun filaments having a distinct, continuous, uniform-density sheath of a first polymer surrounding a distinct, continuous core of a second polymer; the first polymer further having a thermal decomposition temperature at least 50 degrees Celsius lower than the thermal decomposition temperature of the second polymer.

主权项

1. A yarn comprising a plurality of filaments, each of the filaments having a distinct, continuous, uniform-density sheath of a first polymer and a distinct, continuous core of a second polymer, with the sheath surrounding the core;
wherein the filaments are made by extruding a first polymer solution containing the first polymer in a solvent with a second polymer solution containing the second polymer in the same solvent; and additionally, the first polymer solution being salt-free and the second polymer solution including at least 4 percent inorganic salt by weight, based on the amount of the salt, the second polymer and the solvent in the second solution; the first polymer further having a thermal decomposition temperature at least 50 degrees Celsius lower than the thermal decomposition temperature of the second polymer.