Non-aqueous oral care compositions

Patent metadata

Field	Value
Publication number	US-9877911-B2
Application number	US-201113704108-A
Country	US
Kind code	B2
Filing date	Jun 16, 2011
Priority date	Jun 23, 2010
Publication date	Jan 30, 2018
Grant date	Jan 30, 2018

Abstract

The invention provides a non-aqueous oral care composition with a liquid continuous phase comprising a thickening agent, a humectant, and one or more liquid polyethylene glycols having a melting point below 25° C., in which the liquid continuous phase is structured with crystals of one or more solid polyethylene glycols having a melting point of 25° C. or above. The rheological behavior of the composition of the invention corresponds well with the characteristic rheological behavior of typical aqueous dentifrice formulations.

First claim

The invention claimed is:

1. A non-aqueous oral care composition, comprising:
a liquid continuous phase comprising:
a thickening agent,
a humectant, and
one or more liquid polyethylene glycols having a melting point below 25° C.;
wherein the thickening agent comprises a carboxyvinyl polymer with a molecular weight of at least 750,000 g/mol;
wherein the liquid continuous phase comprises crystals of one or more solid polyethylene glycols;
wherein the liquid polyethylene glycols have an average molecular weight of 285 to 420;
wherein the liquid polyethylene glycols are present in an amount of 5 to 15 wt % of the non-aqueous oral care composition;
wherein the solid polyethylene glycols are present in an amount of 0.1 to 5 wt % of the non-aqueous oral care composition;
wherein water is present in an amount of no greater than 3 wt % of the non-aqueous oral care composition; and
wherein each of the one or more solid polyethylene glycols has a general formula H(OCH2CH2)n OH, where n is a number of repeating oxyethylene units, and wherein an average value of n ranges from 60 to 150.

2. The composition according to claim 1 , wherein the thickening agent comprises a carboxyvinyl polymer selected from homopolymers of acrylic acid cross-linked with allyl ethers of sucrose or pentaerythritol; and homopolymers of acrylic acid cross-linked with divinyl glycol.

3. The composition according to claim 1 , wherein the humectant is one or more organic polyols having 3 or more hydroxyl groups in the molecule.

4. The composition according to claim 1 , wherein the average value of n ranges from 60 to 75.

5. The composition according to claim 1 , wherein the liquid polyethylene glycol has a melting point ranging from −15 to 8° C.

6. The composition according to claim 1 , wherein the liquid polyethylene glycol has the general formula H(OCH2CH2)n OH, where n is the number of repeating oxyethylene units, and the average value of n ranges from 6 to 8.

7. The oral care composition according to claim 1 , which is in the form of a dentifrice comprising an abrasive cleaning agent in an amount of from 3 to 75% by weight based on the total weight of the dentifrice, and a surfactant in an amount of from 0.2 to 5% by weight based on the total weight of the dentifrice.

8. The oral care composition according to claim 1 , which further comprises a mixture of a calcium source and a phosphate source.

9. The oral care composition according to claim 8 , in which the calcium source is calcium silicate and the phosphate source is a mixture of trisodium phosphate and sodium dihydrogen phosphate.

10. The oral care composition according to claim 1 , which further comprises one or more oral care actives selected from fluoride sources, plant-derivable antioxidants and antioxidant vitamins.

11. A process of preparing the non-aqueous oral care composition according to claim 1 , comprising the steps of
forming a mixture comprising the thickening agent, the humectant, the one or more liquid polyethylene glycols and the one or more solid polyethylene glycols;
heating the mixture to a temperature above the melting point of the one or more solid polyethylene glycols; and
cooling the mixture to form crystals of the one or more solid polyethylene glycols.

Assignees

• Groves Brian Joseph
• Waterfield Philip Christopher
• Conopco Inc

Inventors

• Groves Brian Joseph
• Waterfield Philip Christopher

Classifications

• A61K8/39

  Derivatives containing from 2 to 10 oxyalkylene groups · CPC title

• A61K2800/31

  Anhydrous · CPC title

• A61K8/8147

  Homopolymers or copolymers of acids; Metal or ammonium salts thereof, e.g. crotonic acid, (meth)acrylic acid; Compositions of derivatives of such polymers · CPC title

• A61Q11/00

  Preparations for care of the teeth, of the oral cavity or of dentures; Dentifrices, e.g. toothpastes; Mouth rinses · CPC title

• A61K8/86 Primary

  Polyethers · CPC title