Process for producing dyeable hot-bulked polypropylene fibers modified with a copolyamide
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United States of America Patent
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Jul 14, 1992
Grant Date -
N/A
app pub date -
Jul 27, 1990
filing date -
Jul 27, 1990
priority date (Note) -
Expired
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Abstract
Dyeable fibers are formed from polypropylene by blending a major portion of polypropylene with a minor portion of 1) a copolymer of nylon 6,6 and substantially equimolar amounts of hexamethylene diamine and an alkali metal salt of 5-sulfoisophthalic acid or 2) a basic reaction product of substantially equimolar amounts of N-(2-aminoethyl) piperazine and adipic acid, hexamethylene diamine and adipic acid and optionally .epsilon.-caprolactam. The blend is formed in an extruder and extruded into filaments which are quenched in air, stretched 2-4.times. (preferably at an elevated temperature) and bulked using a jet of heated turbulent fluid. The thusly bulked filaments are then dyed.
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