Process for preparing stable dentifrice

Claim 2

A PROCESS FOR PREPARING A DENTIFRICE STABLE AGAINST PRECIPITATION AND FLOCULATION COMPRISING ADDING TO A BLEND OF ABOUT 0.2-10% BY WEIGHT OF ALKALI METAL CARBOXYALKYL CELLULOSE, A HUNMECTANT AND WATER, A WATER-SOLUBLE SURFACE ACTIVE AGENT AND A WATER-SOLUBLE NON-TOXIC AICD ADDITION SALT OF 1,6-DI(PCHLOROPHENYL BIGUANIDO) HEXANE IN ABOUT 0.01-5% BY WEIGHT OF THE FREE BASE THEREOF, SAID ACID ADDITION SALT BEING ADDED TO SAID BLEND (AFTER THE ADDITION OF) IN AQUEOUS SOLUTION NO SOONER THAN SAID SURFACE-ACTIVE AGENT (OR SIMULATANEOUSLY WITH THE ADDITION OF SAID SURFACE-ACTIVE AGENT), AND SO MIXING WITH THESE COMPONENTS A DENTALLY-ACCEPTABLE WATER-SOLUBLE POLISHING MATERIAL; SAID PERCENTAGES BEING BASED ON SAID DENTIFRICE COMPOSITION.

Claim 3

The process claimed in claim 1 wherein said acid addition salt is added to said blend after addition of said surface-active agent.

Claim 4

The process claimed in claim 1 wherein said acid addition salt is added to said blend simultaneously with the addition of said surface active agent.

Claim 5

The process claimed in claim 1 wherein said alkali metal carboxyalkyl cellulose is sodium carboxymethyl cellulose.

Claim 6

The process claimed in claim 1 wherein said surface-active agent is sodium N-lauroyl sarcosinate.

Claim 7

The process claimed in claim 1 wherein based on 100% by weight of the dentifrice there are employed about 15-80% by weight of said humectant, about 0.2-10% by weight of said alkali-metal carboxyalkyl cellulose, about 0.05-5% by weight of said surface-active agent, amount of said acid addition salt to provide about 0.01-5% by weight of the free base form of said acid addition salt, and about 20-75% by weight of said polishing material.

Claim 8

The process claimed in claim 1 wherein said humectant is selected from the group consisting of glycerine, sorbitol, propylene glycol and polyethylene glycol 400 and mixtures thereof.

Claim 9

The process claimed in claim 7 wherein said humectant is glycerine.

Claim 10

The process claimed in claim 7 wherein said humectant is a mixture of glycerine and sorbitol.

Claim 11

A process for preparing a dentifrice stable against precipitation and floculation comprising adding to a blend of about 0.2-10% by weight of alkali metal carboxyalkyl cellulose, about 15-80% by weight of a humectant comprising glycerine and water, about 0.05-5% by weight of sodium N-lauroyl sarcosinate and a water-soluble non-toxic acid addition salt of 1,6-di-(p-chlorophenyl biguanido) hexane in about 0.01-5% by weight of the free base thereof, said acid addition salt being added to said blend (after the addition of said surface-active agent or simultaneously with the addition of said surface-active agent,) in aqueous solution no sooner than said sodium N-lauroyl sarcosinate, and also mixing with these components up to about 75% by weight of a dentally acceptable water-insoluble polishing material; said percentages being based on the weight of said dentifrice composition.

Claim 12

A process for preparing a dentifrice stable against precipitation and floculation comprising adding to a blend of about 0.2-10% by weight of alkali metal carboxyalkyl cellulose, about 15-80% by weight of a humectant comprising glycerine and water, about 0.05-5% by weight of sodium N-lauroyl sarcosinate and a water-soluble non-toxic acid addition salt of 1,6-di-(p-chlorophenyl biguanido) hexane in about 0.01-5% by weight of the free base thereof, said acid addition salt being added to said blend (after the addition of said surface-active agent or simultaneously with the addition of said surface-active agent,) in aqueous solution no sooner than said sodium N-lauroyl sarcosinate, and also mixing with these components up to about 75% by weight of a dentally acceptable water-insoluble polishing material; said percentages being based on the weight of said dentifrice composition.

Claim 13

The process claimed in claim 10 wherein said acid addition salt is added to said blend after addition of said sodium N-lauroyl sarcosinate.

Claim 14

The process claimed in claim 10 wherein said humectant also includes sorbitol.

Claim 15

The process claimed in claim 10 wherein said acid addition salt is added to said blend simultaneously with the addition of said sodium N-lauroyl sarcosinate.

Claim 16

The process claimed in claim 13 wherein said polishing material is selected from the group consisting of colloidal silica and alkali metal aluminosilicate complex.