Fibrous structures and methods for making same
Fibrous structures that contain hydroxyl polymer filaments and solid additives and methods for making same are provided.
1. A thermally bonded fibrous structure comprising a plurality of non-thermoplastic hydroxyl polymer filaments comprising from about 50% to about 99.5% by weight of a non-thermoplastic hydroxyl polymer selected from the group consisting of starch, starch derivatives, starch copolymers, and mixtures thereof, and a plurality of solid additives,
wherein the fibrous structure exhibits a Total Energy Absorbed (TE) of at least 3.05 g/in/gsm as measured by the TEA Test Method,
wherein at least one of the non-thermoplastic hydroxyl polymer filaments further comprises a non-hydroxyl polymer present in the non-thermoplastic hydroxyl polymer filament at a concentration greater than its entanglement concentration (Ce),
wherein the non-hydroxyl polymer is present in the non-thermoplastic hydroxyl polymer filament at a level of from about 0.01% to about 10% by weight and the non-hydroxyl polymer exhibits a weight average molecular weight of from 1,300,000 to 10,000,000 g/mol,
wherein the non-hydroxyl polymer comprises two or more different weight average molecular weight polyacrylamides.
2. The fibrous structure according to claim 1 wherein the non-hydroxyl polymer exhibits a weight average molecular weight of from 1,400,000 to 10,000,000 g/mol.
3. The fibrous structure according to claim 1 wherein the non-hydroxyl polymer exhibits a polydispersity of greater than 1.10.
4. The fibrous structure according to claim 1 wherein the non-hydroxyl polymer further comprises polyacrylic acid, polymethacrylic acid and their esters; polyethyleneimine; copolymers made from mixtures of the aforementioned polymers; or mixtures thereof.
5. The fibrous structure according to claim 1 wherein the non-thermoplastic hydroxyl polymer filaments further comprise a polymer selected from the group consisting of: chitosan, chitosan derivatives, chitosan copolymers, cellulose, cellulose derivatives, cellulose derivatives, cellulose copolymers, hemicelluloses, hemicelluloses derivatives, hemicelluloses copolymers, and mixtures thereof.
6. The fibrous structure according to claim 1 wherein the non-thermoplastic hydroxyl polymer comprises an ethoxylated starch.
7. The fibrous structure according to claim 1 wherein the non-thermoplastic hydroxyl polymer comprises an acid-thinned starch.
8. The fibrous structure according to claim 1 wherein at least one of the non-thermoplastic hydroxyl polymer filaments further comprises a hydroxyl polymer selected from the group consisting of: polyvinyl alcohol, polyvinyl alcohol derivatives, polyvinyl alcohol copolymers, gums, arabinans, galactans, proteins, and mixtures thereof.
9. The fibrous structure according to claim 8 wherein at least one of the non-thermoplastic hydroxyl polymer filaments further comprises polyvinyl alcohol and one or more polysaccharides.
10. The fibrous structure according to claim 1 wherein the solid additives are present on at least one surface of the fibrous structure.
11. The fibrous structure according to claim 10 wherein the solid additives cover less than the entire surface area of the surface of the fibrous structure.
12. The fibrous structure according to claim 10 wherein the solid additives are present on the surface of the fibrous structure in a random pattern.
13. The fibrous structure according to claim 10 wherein the solid additives are present on the surface of the fibrous structure in a non-random repeating pattern.
14. The fibrous structure according to claim 1 wherein the solid additives are uniformly distributed throughout the fibrous structure.
15. The fibrous structure according to claim 1 wherein the solid additives are non-uniformly distributed throughout the fibrous structure.
16. The fibrous structure according to claim 1 wherein at least one of the solid additives exhibits a critical surface tension of greater than about 30 dynes/cm.
17. The fibrous structure according to claim 1 wherein at least one solid additive comprises a wood pulp fiber.
18. The fibrous structure according to claim 1 wherein at least one of the solid additives exhibits a particle size of less than 6 mm in the maximum dimension.
19. The fibrous structure according to claim 1 wherein the fibrous structure comprises less than 50% by bone dry weight of the solid additives.
20. A single- or multi-ply sanitary tissue product comprising a fibrous structure according to claim 1 .