Denture adhesive hydrogel with dry tack

1. A denture adhesive hydrogel comprising:

(a) a mixed salt of a copolymer of alkyl vinyl ether, and (i) maleic anhydride or (ii) maleic acid,

wherein the mixed salt comprises monovalent and multivalent cationic salts selected from the group consisting of sodium, calcium, zinc, strontium, ferric and mixtures thereof;

(b) a dry tack enhancing agent being polyvinylpyrrolidone, and optionally one or both of polyethylene oxide and a cellulose derivative, wherein the dry tack agent is in an amount of about 0.1% to less than 5.0% by weight of the hydrogel; and

(c) water,

wherein the hydrogel has a dry tack physical characteristic.

2. The denture adhesive hydrogel of claim 1 , wherein said dry tack enhancing agent is polyvinylpyrrolidone.

3. The denture adhesive hydrogel of claim 1 , wherein said cellulose derivative is selected from the group consisting of sodium methylcellulose, sodium carboxymethylcellulose, sodium hydroxyethylcellulose, sodium hydroxypropylcellulose, sodium hydroxypropylmethylcellulose, and mixtures thereof.

4. The denture adhesive hydrogel of claim 1 , further comprising a compound selected from the group consisting of a calcium compound, a zinc compound, a strontium compound, a ferric compound, and mixtures thereof.

5. The denture adhesive hydrogel of claim 4 , wherein:

said calcium compound is selected from the group consisting of calcium hydroxide, calcium acetate, calcium carbonate, calcium halides, calcium lactate, calcium oxide, calcium nitrate, calcium phosphate, calcium gluconate, and combinations thereof;

said zinc compound is selected from the group consisting of zinc chloride, zinc oxide, and combinations thereof;

said strontium compound is selected from the group consisting of strontium chloride hexahydrate, strontium chloride, strontium citrate, and combinations thereof; and

said ferric compound is selected from the group consisting of ferric chloride hexahydrate, ferric chloride, ferric subsulfate, and combinations thereof.

6. The denture adhesive hydrogel of claim 1 , wherein said mixed salt of said copolymer includes a monovalent cation and a bivalent cation and is about 25% to about 50% by weight of the hydrogel.

7. The denture adhesive hydrogel of claim 1 , wherein said water is about 35% to about 65% by weight of the hydrogel.

8. The denture adhesive hydrogel of claim 1 , wherein said mixed salt includes an alkaline earth metal bivalent cation and an alkali metal monovalent cation.

9. The denture adhesive hydrogel of claim 5 , wherein:

said calcium compound is calcium hydroxide;

said zinc compound is zinc chloride;

said strontium compound is strontium chloride hexahydrate; or

said ferric compound is ferric subsulfate.

10. The denture adhesive hydrogel of claim 5 , wherein:

said calcium compound is about 0.05% to about 10% by weight of the hydrogel;

said zinc compound is about 0.05% to about 0.5% by weight of the hydrogel;

said strontium compound is about 0.05% to about 0.5% by weight of the hydrogel; or

said ferric compound is about 0.05% to about 2% by weight of the hydrogel.

11. The denture adhesive hydrogel of claim 1 , further comprising a humectant.

12. The denture adhesive hydrogel of claim 11 , wherein said humectant is selected from the group consisting of glycerin, polyhydric alcohols, ethylene glycol, propylene glycol, polyethylene glycol, sorbitol, and combinations thereof.

13. The denture adhesive hydrogel of claim 12 , wherein said humectant is glycerin.

14. The denture adhesive hydrogel of claim 11 , wherein said humectant is about 5% to about 30% by weight of the hydrogel.

15. The denture adhesive hydrogel of claim 1 , further comprising an additional ingredient selected from the group consisting of an antimicrobial agent, an antibiotic, an anti-inflammatory agent, a dental desensitizing agent, an anesthetic agent, an anti-fungal, an aromatic, insulin, a steroid, an anti-neoplastic, a rheological agent, a colorant, a preservative, a flavor component, a fragrance component, a sensation component, and combinations thereof.

16. The denture adhesive hydrogel of claim 1 , wherein the mixed salt comprises a trivalent ferric salt.

17. The denture adhesive hydrogel of claim 2 , wherein said polyvinylpyrrolidone is in an amount of 1% by weight of the hydrogel.

18. The denture adhesive hydrogel of claim 17 , wherein the mixed salt comprises a trivalent ferric salt.

19. The denture adhesive hydrogel of claim 16 , wherein the mixed salt further comprises a sodium compound, a calcium compound, a zinc compound, and a strontium compound.

20. The denture adhesive hydrogel of claim 2 ,

wherein the mixed salt of the copolymer of alkyl vinyl ether, and (i) maleic anhydride or (ii) maleic acid is about 30% by weight of the hydrogel;

wherein polyvinylpyrrolidone is in an amount of from in an amount of about 0.1% to less than 5.0% by weight of the hydrogel;

wherein the denture adhesive hydrogel further comprises

sodium hydroxide in an amount of about 0.2% by weight of the hydrogel,

calcium hydroxide in an amount of about 0.42% by weight of the hydrogel,

zinc chloride in an amount of about 0.019% by weight of the hydrogel,

strontium chloride hexahydrate in an amount of about 0.037% by weight of the hydrogel, and

ferric subsulfate in an amount of about 0.21% by weight of the hydrogel.

21. The denture adhesive hydrogel of claim 20 , wherein the denture adhesive hydrogel further comprises

glycerin in an amount of about 15% by weight of the hydrogel,

methyl paraben in an amount of about 0.05% by weight of the hydrogel, and

red 27 lake in an amount of 0.01% by weight of the hydrogel.

22. The denture adhesive hydrogel of claim 21 ,

wherein polyvinylpyrrolidone is in an amount of 1% or 4% by weight of the hydrogel;

wherein water makes the weight balance of the hydrogel.