Fibrous structures exhibiting improved whiteness index values

Patent metadata

Field	Value
Publication number	US-11091606-B2
Application number	US-201414247544-A
Country	US
Kind code	B2
Filing date	Apr 8, 2014
Priority date	Apr 12, 2013
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

Abstract

Fibrous structures, for example sanitary tissue products, containing a plurality of filaments that employ one or more filament-forming materials, such as one or more hydroxyl polymers, and one or more hueing agents, present within the filaments such that the fibrous structures exhibit a Whiteness Index of greater than 72 as measured according to the Whiteness Index Test Method described herein.

First claim

What is claimed is:

1. A multi-ply toilet tissue useful as a wiping implement for post-urinary and post-bowel movement cleaning, wherein the multi-ply toilet tissue comprises two or more fibrous structure plies combined together with a glue, wherein at least one of the fibrous structure plies comprises a fibrous structure, wherein the fibrous structure comprises both a plurality of fibers consisting of pulp fibers and a scrim material comprising a plurality of crosslinked filaments comprising one or more filament-forming polymers and one or more hueing agents comprising a dye present within the crosslinked filaments during use of the multi-ply toilet tissue such that the fibrous structure exhibits a Whiteness Index of greater than 72 as measured by the Whiteness Index Test Method during use, and wherein the multi-ply toilet tissue is flushable after use and wherein the scrim material is present in the fibrous structure at a basis weight of greater than 0.1 g/m 2 to less than 10 g/m 2 , wherein the crosslinked filaments are formed from an aqueous polymer melt composition comprising the filament-forming polymer, a crosslinking agent comprising an imidazolidinone and an ammonium alkylsulfonate 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, wherein the ammonium alkylsulfonate salt is present within the fibrous element formed from the aqueous polymer melt composition and wherein the fibrous element is cured at a curing temperature of from about 110° C. to about 215° C.

2. The multi-ply toilet tissue according to claim 1 wherein the dye is selected from the group consisting of: acridines, anthraquinones, azines, azos, azoles, benzodifuranes, benzodifuranones, carotenoids, coumarins, cyanines, diazahemicyanines, diphenylmethanes, formazans, hemicyanines, indigoids, methanes, naphthalimides, naphthoquinones, nitros, nitrosos, oxazines, phthalocyanines, pyrazoles, pyrazolines, stilbenes, styryls, triarylmethanes, triphenylmethanes, xanthenes, carboxylic acids, dibenzothiophene dioxides, other 5- and 6-membered-ring heterocycles, and mixtures thereof.

3. The multi-ply toilet tissue according to claim 1 wherein the dye comprises a small molecule dye selected from the group consisting of: dyes falling into the Colour Index (C.I.) classifications of Direct Blue, Direct Red, Direct Violet, Acid Blue, Acid Red, Acid Violet, Acid Black, Basic Blue, Basic Violet, Basic Red, Reactive, Hydrolyzed Reactives, Solvent, Disperse, Food, and mixtures thereof.

4. The multi-ply toilet tissue according to claim 1 wherein the dye is selected from the group consisting of: fibrous structure-substantive colorants, dye-polymer conjugates formed from at least one reactive dye and a polymer selected from the group consisting of polymers comprising a moiety selected from the group consisting of a hydroxyl moiety, a primary amine moiety, a secondary amine moiety, a thiol moiety, and mixtures thereof.

5. The multi-ply toilet tissue according to claim 4 wherein the dye is selected from the group consisting of: Violet CT, Violet DD, Violet V200, Liquitint Violet ION, Permalite Fast Violet B, carboxymethyl cellulose conjugated with a reactive blue dye, carboxymethyl cellulose conjugated with a reactive violet dye, carboxymethyl cellulose conjugated with a reactive red dye, alkoxylated polymeric colorants comprising substituted benzodifuranes, methines, triphenylmethanes, naphthalimides, pyrazoles, naphthoquinones, anthraquinones, thiophenes, thiazoliums, azos, and mixtures thereof.

6. The multi-ply toilet tissue according to claim 1 wherein at least one of the filament-forming polymers comprises a hydroxyl polymer.

7. The multi-ply toilet tissue according to claim 6 wherein the hydroxyl polymer is selected from the group consisting of: polyvinyl alcohol, starch, starch derivatives, cellulose, cellulose derivatives, carboxymethylcellulose, hemicellulose, hemicelluloses derivatives, and mixtures thereof.

8. The multi-ply toilet tissue according to claim 7 wherein the hydroxyl polymer is starch.

9. The multi-ply toilet tissue according to claim 1 wherein at least one of the plurality of filaments comprises a polyacrylamide.

10. The multi-ply toilet tissue according to claim 1 wherein at least one of the plurality of filaments exhibits an average diameter of less than 50 μm as measured according to the Average Diameter Test Method.

11. The multi-ply toilet tissue according to claim 1 wherein the fibrous structure comprises at least one filament that comprises at least one different hueing agent from the other filaments.

12. The multi-ply toilet tissue according to claim 1 wherein the pulp fibers are wood pulp fibers.

13. The multi-ply toilet tissue according to claim 1 wherein the fibrous structure exhibits a Relative Hue Angle of from about 220° to about 330° as measured according to the Hue Anile Test Method.

14. The multi-ply toilet tissue according to claim 1 wherein at least one of the plurality of filaments further comprises a compatibilizing agent.

15. A multi-ply toilet tissue according to claim 1 wherein the filaments of the two or more fibrous structures comprise different hueing agents.

16. A multi-ply toilet tissue according to claim 1 wherein at least one of the fibrous structures exhibits a Relative Hue Angle different by at least 5 degrees from a different fibrous structure within the multi-ply toilet tissue as measured by the Hue Angle Test Method.

Assignees

• Procter & Gamble

Inventors

• Gordon Gregory Charles
• Thomas Jacqueline Besinaiz
• Suszcynsky-Meister Elaine Marie
• Sivik Mark Robert
• Miracle Gregory Scot

Classifications

• C08L3/02 Primary

  Starch; Degradation products thereof, e.g. dextrin · CPC title

• D04H3/009

  Condensation or reaction polymers · CPC title

• D04H3/16

  with bonds between thermoplastic filaments produced in association with filament formation, e.g. immediately following extrusion · CPC title

• D04H3/007

  Addition polymers · CPC title

• D04H1/43828

  sheath-core · CPC title