Appeal No. 2006-1003
Application 10/046,535
1. A method of making a stain-resistant sheath/core
nylon filament having an essentially undyed nylon
sheath and an acid-dyed nylon core, said method
comprising the steps of:
(a) providing a dye bath containing an acid dye;
(b) forming a nylon sheath/core filament from a
nylon sheath polymer and a nylon core polymer which is
surrounded entirely by the sheath polymer such that the
filament contains less than about 10 wt.% of the sheath
polymer, wherein the nylon sheath polymer is resistant
to, and thereby remains substantially undyed by, the
acid dye in the dye bath and has an amine end group
(AEG) content of less than about 10 meq/kg, and wherein
the nylon core polymer is susceptible to dyeing by the
acid dye in the dye bath and has an AEG content of
between about 10 meq/kg to about 100 meq/kg;
(c) bringing the nylon sheath/core filament formed
in step (b) into contact with the dye bath; and
(d) allowing the acid dye in the dye bath to
physically diffuse or penetrate through the sheath to
dye the core while the sheath remains substantially
undyed.
THE REFERENCES
Segraves et al. (Segraves) 4,069,363 Jan. 17, 1978
Anton et al. (Anton) 4,075,378 Feb. 21, 1978
Hoyt et al. (Hoyt) 5,340,886 Aug. 23, 1994
Lin 5,447,794 Sep. 5, 1995
Lijten et al. (Lijten) 5,468,555 Nov. 21, 1995
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