Fibrous structure comprising a fiber flexibilizing agent system
Fibrous structures comprising a fiber flexibilizing agent system, methods for making such fibrous structures and sanitary tissue products comprising such fibrous structures are provided.
1. A single-ply or multi-ply sanitary tissue product comprising a fibrous structure comprising a surface comprising a fiber flexibilizing agent system comprising a fiber flexibilizing agent and an opacity increasing agent wherein the net change in opacity of the fibrous structure resulting from the fiber flexibilizing agent system is greater than the net change in opacity of the fibrous structure resulting from the individual components of the fiber flexibilizing agent system, wherein the fiber flexibilizing agent and the opacity increasing agent are present in the fiber flexibilizing agent system at a weight ratio of from about 2:1 to about 100:1.
2. The single-ply or multi-ply sanitary tissue product according to claim 1 wherein the fibrous structure further comprises a cellulosic fiber.
3. The single-ply or multi-ply sanitary tissue product according to claim 1 wherein the fiber flexibilizing agent is selected from the group consisting of humectants and plasticizers.
4. The single-ply or multi-ply sanitary tissue product according to claim 3 wherein the plasticizer comprises a polyhydroxy compound.
5. The single-ply or multi-ply sanitary tissue product according to claim 4 wherein the polyhydroxy compound comprises polyethylene glycol.
6. The single-ply or multi-ply sanitary tissue product according to claim 5 wherein the polyethylene glycol has a weight average molecular weight of from about 100 to about 500 g/mol.
7. The single-ply or multi-ply sanitary tissue product according to claim 1 wherein the opacity increasing agent is selected from the group consisting of: pigments, fillers and mixtures thereof.
8. The single-ply or multi-ply sanitary tissue product according to claim 1 wherein the opacity increasing agent is selected from the group consisting of: clay, calcium carbonate, titanium dioxide, talc, aluminum silicate, calcium silicate, alumina trihydrate, activated carbon, pearl starch, calcium sulfate, glass microspheres, diatomaceous earth, and mixtures thereof.
9. The single-ply or multi-ply sanitary tissue product according to claim 1 wherein the increase in opacity of the fibrous structure resulting from the fiber flexibilizing agent system is 0.05% points greater than the net increase in opacity of the fibrous structure resulting from individual components of the fiber flexibilizing agent system.
10. The single-ply or multi-ply sanitary tissue product according to claim 1 wherein the fiber flexibilizing agent is present in the fibrous structure at from about 2% to about 30% by weight of the fibrous structure.
11. The single-ply or multi-ply sanitary tissue product according to claim 1 wherein the opacity increasing agent is present in the fibrous structure at from about 0.02% to about 15% by weight of the fibrous structure.
12. A method for making a single-ply or multi-ply sanitary tissue product, the method comprising the steps of:
a) providing a single-ply or multi-ply sanitary tissue product comprising a fibrous structure comprising a surface;
b) contacting the surface of the fibrous structure with a fiber flexibilizing agent system comprising a fiber flexibilizing agent and an opacity increasing agent such that the net change in opacity of the fibrous structure resulting from the fiber flexibilizing system is greater than the net change in opacity of the fibrous structure resulting from the individual components of the fiber flexibilizing agent system, wherein the fiber flexibilizing agent and the opacity increasing agent are present in the fiber flexibilizing agent system at a weight ratio of from about 2:1 to about 100:1.