FOAM FORMULATIONS FOR APPLICATION OF DRY STRENGTH AGENTS

1 . A method for manufacturing a paper product, the method comprising:

producing a foam of a gas, water, a dry strength agent, and a combination of foaming agents including an anionic sulfated/sulfonated surfactant and a polysorbate-type nonionic surfactant;

applying the foam to a web; and

processing the web to form the product.

2 . The method of claim 1 , wherein the dry strength agent has a cationic functional group.

3 . The method of claim 1 , wherein the dry strength agent comprises a graft copolymer of a vinyl monomer and functionalized vinyl amine, a vinyl amine containing polymer, or an acrylamide containing polymer.

4 . The method of claim 1 , wherein the anionic sulfated/sulfonated surfactant comprises a sodium alkyl sulfate.

5 . The method of claim 1 , wherein the anionic sulfated/sulfonated surfactant comprises sodium dodecyl sulfate (SDS).

6 . The method of claim 1 , wherein the polysorbate-type nonionic surfactant comprises polysorbate 20.

7 . The method of claim 1 , wherein the combination of foaming agents has an anionic sulfated/sulfonated surfactant to polysorbate-type nonionic surfactant ratio of from 3:7 to 9:1.

8 . The method of claim 1 , wherein the combination of foaming agents has an anionic sulfated/sulfonated surfactant to polysorbate-type nonionic surfactant ratio of from 5:5 to 7:3.

9 . The method of claim 1 , wherein the anionic sulfated/sulfonated surfactant comprises sodium dodecyl sulfate (SDS), wherein the polysorbate-type nonionic surfactant comprises polysorbate 20, and wherein the combination of foaming agents has a sodium dodecyl sulfate to polysorbate 20 ratio of from 3:7 to 9:1.

10 . The method of claim 1 , wherein the anionic sulfated/sulfonated surfactant comprises sodium dodecyl sulfate (SDS), wherein the polysorbate-type nonionic surfactant comprises polysorbate 20, and wherein the combination of foaming agents has a sodium dodecyl sulfate to polysorbate 20 ratio of from 5:5 to 7:3.

11 . The method of claim 1 , wherein the anionic sulfated/sulfonated surfactant comprises sodium dodecyl sulfate (SDS), wherein the polysorbate-type nonionic surfactant comprises polysorbate 20, and wherein the combination of foaming agents consists of the sodium dodecyl sulfate (SDS) and the polysorbate 20.

12 . A formulation for producing a foam with a gas content upon incorporation of gas into the formulation, the formulation comprising:

water;

a dry strength agent having a cationic functional group;

an anionic sulfated/sulfonated surfactant; and

a polysorbate-type nonionic surfactant.

13 . The formulation of claim 12 , wherein the dry strength agent comprises a graft copolymer of a vinyl monomer and functionalized vinyl amine, wherein the anionic sulfated/sulfonated surfactant comprises sodium dodecyl sulfate (SDS), and wherein the polysorbate-type nonionic surfactant comprises polysorbate 20.

14 . The formulation of claim 13 , wherein the formulation has a sodium dodecyl sulfate to polysorbate 20 ratio of from 3:7 to 9:1.

15 . The formulation of claim 13 , wherein the formulation has a sodium dodecyl sulfate to polysorbate 20 ratio of from 5:5 to 7:3.

16 . The formulation of claim 13 , wherein the formulation is substantially free of surfactants other than the sodium dodecyl sulfate (SDS) and the polysorbate 20.

17 . The formulation of claim 13 , wherein the formulation consists essentially of:

water;

the dry strength agent having a cationic functional group;

the anionic sulfated/sulfonated surfactant; and

the polysorbate-type nonionic surfactant.

18 . The formulation of claim 13 , wherein the formulation is free of starch.

19 . The formulation of claim 13 , further comprising uncooked starch.

20 . The formulation of claim 19 , wherein the formulation consists essentially of:

the uncooked starch;

water;

the dry strength agent having a cationic functional group;

the anionic sulfated/sulfonated surfactant; and

the polysorbate-type nonionic surfactant.