Two-component loop yarns comprising aramid filaments, manufacture thereof and use thereof
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United States of America Patent
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Jul 8, 1997
Grant Date -
N/A
app pub date -
Dec 5, 1995
filing date -
Dec 7, 1994
priority date (Note) -
Expired
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Abstract
Two-component loop yarns are composed of core and effect filaments, at least part of the core component consisting of aromatic polyamides, wherein the aromatic polyamides contain the structural repeat units of the formulae I and II --OC--Ar.sup.1 --CO--NH--Ar.sup.2 --NH-- (I) --OC--Ar.sup.1 --CO--NH--Ar.sup.3 --NH-- (II), where Ar.sup.1, Ar.sup.2 and Ar.sup.3 are each independently of the others a bivalent mono- or polycyclic aromatic radical whose free valences are disposed para or meta or comparably parallel, coaxial or angled to each other, and Ar.sup.2 and Ar.sup.3 each have different individual meanings within the scope of the given definitions, and the respective monomer components underlying the polymer are selected so as to produce an aromatic polyamide which forms preferably isotropic solutions in organic solvents.
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