Fibrous structures comprising polysaccharide filaments
Polysaccharide filaments and fibrous structures containing such polysaccharide filaments and more particularly polysaccharide filaments that exhibit birefringence are provided.
1. A fibrous structure comprising a plurality of filaments, wherein the plurality of filaments comprise greater than 85% by weight of a crosslinked unmodified starch, which has been formed using a crosslinking agent comprising dihydroxyethyleneurea and a crosslinking facilitator comprising an ammonium salt derived from an acid selected from the group consisting of: methanesulfonic acid, ethanesulfonic acid, propanesulfonic acid, isopropylsulfonic acid, butanesulfonic acid, isobutylsulfonic acid, sec-butylsulfonic acids, and trifluoromethanesulfonic acid, and mixtures thereof, such that 10% of pixels in images of the filaments exhibit a retardance of 3 nm or greater as measured according to the Birefringence Test Method, and wherein the fibrous structure further comprises one or more thermal bond sites.
2. The fibrous structure according to claim 1 wherein 10% of pixels in images of the filaments exhibit a retardance of about 4 nm or greater as measured according to the Birefringence Test Method.
3. The fibrous structure according to claim 1 wherein the filament further comprises a polysaccharide selected from the group consisting of: starch copolymers, chitosan, chitosan derivatives, chitosan copolymers, cellulose, cellulose derivatives, cellulose copolymers, hemicellulose, hemicellulose derivatives, hemicellulose copolymers, and mixtures thereof.
4. The fibrous structure according to claim 1 wherein at least one of the filaments comprises a polyacrylamide.
5. The fibrous structure according to claim 1 wherein at least one of the filaments comprises a surfactant.
6. The fibrous structure according to claim 5 wherein the surfactant comprises a fast wetting surfactant.
7. The fibrous structure according to claim 1 wherein the ammonium salt is derived from methanesulfonic acid.
8. The fibrous structure according to claim 1 wherein at least one of the filaments comprises a hueing agent.
9. The fibrous structure according to claim 1 wherein at least one of the filaments exhibits an average diameter of less than 50 μm as measured according to the Average Diameter Test Method.
10. The fibrous structure according to claim 1 wherein the fibrous structure further comprises a plurality of pulp fibers.
11. The fibrous structure according to claim 1 wherein the fibrous structure exhibits a Whiteness Index of greater than 72 as measured by the Whiteness Index Test Method.
12. The fibrous structure according to claim 1 wherein the fibrous structure exhibits a basis weight of from about 1 g/m 2 to about 5000 g/m 2 as measured according to the Basis Weight Test Method.
13. The fibrous structure according to claim 1 wherein the plurality of filaments comprise from about 0.1% to 5% by weight of the crosslinking facilitator.