Appeal No. 2026-0818
Application No. 10/175,064
Lin discloses textile articles, especially carpets,
comprising polyamide sheath-core filaments wherein the sheath is
comprised of a polyamide which is resistant to staining by acid
dyes (col. 1, lines 7-11). An exemplified filament has a
nylon 66 core and a nylon 6,12 sheath, the sheath to core ratio
being 1:9 (col. 5, lines 6-8 and 27). Pigments can be
incorporated into the sheath and/or core polymer (col. 3,
lines 20-24). Lin does not disclose dyeing the filaments.
Jenkins discloses a method for “improving the stain
resistance, lightfastness and ozone resistance of nylon,
especially nylon carpet” (col. 1, lines 11-13). Jenkins teaches
that “[c]ationic dyeable nylons contain SO H groups or COOH3
groups within the polymer structure in an amount sufficient to
render the nylon fiber dyeable with a cationic dye which groups
are receptive to cationic or basic dyes” (col. 1, lines 24-28)
and that “[c]ationic dyeable nylons generally exhibit inherent
stain resistant properties, especially to acid-type stains”
(col. 1, lines 34 and 51-52). Jenkins dyes cationic dyeable
nylon fibers with acid dyes or premetalized acid dyes at a pH of
about 4.0 to 6.5, fixes the dyes to the fibers, and produces,
from the fibers, carpet having improved stain and ozone
resistance and lightfastness properties (col. 1, lines 11-13
3
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