Fibrous substrates containing fibers with fiber additives
Patterned fibrous substrates having a plurality of individual fibers, a first region, and a second region are provided. The plurality of individual fibers comprise a functional surface additive. A plurality of individual fibers of the first region have a first diameter, and a plurality of individual fibers of the second region have a second diameter. The first diameter is less than the second diameter. The first region has a first C.I.E. L* score, and the second region has a second C.I.E. L* score. The first C.I.E. L* score is different than the second C.I.E. L* score.
1 . A patterned fibrous substrate comprising a plurality of individual fibers, a first region, and a second region;
wherein the plurality of individual fibers comprise a functional surface additive;
wherein a plurality of individual fibers of the first region have a first diameter according to the Fiber Diameter Test Method, wherein a plurality of individual fibers of the second region have a second diameter according to the Fiber Diameter Test Method, and wherein the first diameter is less than the second diameter;
wherein the plurality of the individual fibers of the first region have a first shape, wherein the first shape is substantially circular;
wherein the plurality of the individual fibers of the second region have a second shape, wherein the second shape is different from the first shape, and wherein the second shape is substantially flat;
wherein the first region has a first C.I.E. L* score, according to the Color Test Method;
wherein the second region has a second C.I.E. L* score, according to the Color Test Method;
and wherein the first C.I.E. L* score is different than the second C.I.E. L* score.
2 . The patterned fibrous substrate of claim 1 , further comprising a plurality of primary bonds disposed in the first region and the second region.
3 . The patterned fibrous substrate of claim 2 , wherein the patterned fibrous substrate is free of bonds other than the plurality of primary bonds.
4 . The patterned fibrous substrate of claim 1 , wherein the patterned fibrous substrate is formed from a single nonwoven web.
5 . The patterned fibrous substrate of claim 1 , wherein the patterned fibrous substrate consists of a single fiber type.
6 . The patterned fibrous substrate of claim 1 , wherein the first region does not overlap the second region.
7 . The patterned fibrous substrate of claim 1 , further comprising a plurality of primary bonds disposed in the first region and the second region, wherein the plurality of fibers of the fibrous substrate are substantially unattached outside of the plurality of primary bonds.
8 . The patterned fibrous substrate of claim 1 , wherein the functional surface additive is selected from a melt additive or a topical additive.
9 . The patterned fibrous substrate of claim 1 , wherein the functional surface additive is selected from the group of: fatty amides, monoglycerides, diglycerides, triglycerides, silicones and copolymers thereof, fatty alcohols, fatty acids, fatty acid esters, polyolefin copolymers, and combinations thereof.
10 . The patterned fibrous substrate of claim 1 , wherein the functional surface additive comprises erucamide.
11 . The patterned fibrous substrate of claim 1 , wherein the functional surface additive comprises glyceryl tristearate.
12 . The patterned fibrous substrate of claim 1 , wherein the functional surface additive comprises a silicone-containing compound.
13 . The patterned fibrous substrate of claim 1 , wherein an absolute difference between the first C.I.E. L* score and the second C.I.E. L* score (ΔL*) is greater than 4.
14 . The patterned fibrous substrate of claim 1 , wherein the individual fibers comprise mono-component polypropylene fibers.
15 . The patterned fibrous substrate of claim 1 , wherein the individual fibers comprise bi-component fibers having a sheath/core structure, wherein a sheath of the fibers comprises polyethylene, and wherein a core of the fibers comprises polypropylene and/or polyester.
16 . The patterned fibrous substrate of claim 1 , wherein the first region has a first opacity, according to the Opacity Test Method, wherein the second region has a second opacity, according to the Opacity Test Method, and wherein the first opacity is different than the second opacity.
17 . The patterned fibrous substrate of claim 16 , wherein a difference between the first opacity and the second opacity is between about 5% and about 60%, according to the Opacity Test Method.
18 . The patterned fibrous substrate of claim 1 , wherein the first region has a first region fluid permeability score (PS1), according to the Fluid Permeability Test Method;
wherein the second region has a second region fluid permeability score (PS2), according to the Fluid Permeability Test Method;
wherein the first region fluid permeability score (PS1) is different than the second region fluid permeability score (PS2).
19 . The patterned fibrous substrate of claim 18 , wherein the first region fluid permeability score (PS1) and the second region fluid permeability score (PS2) are both greater than 5 Darcy, according to the Fluid Permeability Test Method.
20 . An absorbent article comprising the patterned fibrous substrate of claim 1 , wherein the patterned fibrous substrate forms at least a portion of one of: an outer cover, a topsheet, a front ear, a back ear, a front belt, a back belt, a waistband, and a fastener landing zone.
21 . A laminate comprising the patterned fibrous substrate of claim 1 , wherein the laminate comprises a second substrate, wherein a portion of the second substrate has a second substrate C.I.E. L* score, according to the Color Test Method; and wherein the first C.I.E. L* score is greater than the second substrate C.I.E. L* score.
22 . The laminate of claim 21 , wherein the second substrate is a film.