Abstract: A composition of matter useful as a polishing agent combination in a dentifrice, such as a toothpaste. A silica polishing agent is combined with a weakly calcined alumina polishing agent. Preferably, the weakly calcined alumina contains about 50%-90% by weight of alpha aluminum oxide and about 10%-50% by weight of gamma aluminum oxide. Preferably, the silica polishing agent is selected from the group consisting of precipitated silica and silica gel.

Abstract: A process for stabilizing anhydrous dibasic calcium phosphate against reaction with fluorine ions comprising treating an aqueous suspension of anhydrous dibasic calcium phosphate at a pH of from 5 to 10 with a cyclic aminophosphonic acid of the formula ##STR1## WHEREIN N IS AN INTEGER FROM 1 TO 3, OR A WATER-SOLUBLE SALT THEREOF, IN AN AMOUNT OF FROM 0.01% TO 5% BY WEIGHT WITH REFERENCE TO THE ANHYDROUS DIBASIC CALCIUM PHOSPHATE; AS WELL AS TOOTH CLEANING PREPARATIONS CONTAINING THE STABILIZED ANHYDROUS DIBASIC CALCIUM PHOSPHATE.

Abstract: A process for stabilizing dibasic calcium phosphate dihydrate against hydrolysis comprising treating an aqueous suspension of dibasic calcium phosphate dihydrate at a pH of from 5 to 10 with a cyclic aminophosphonic acid of the formula ##STR1## wherein n is an integer from 1 to 3, or a water-soluble salt thereof, in an amount of from 0.01 to 5% by weight with reference to the dibasic calcium phosphate dihydrate; as well as tooth cleaning preparations containing the stabilized dibasic calcium phosphate dihydrate.

Abstract: A process for stabilizing dibasic calcium phosphate dihydrate against hydrolysis comprising treating an aqueous suspension of dibasic calcium phosphate dihydrate at a pH of from 5 to 10 with 3-amino-1-hydroxypropane-1,1-diphosphonic acid, or a water-soluble salt thereof, in an amount of from 0.01 to 5% by weight with reference to the dibasic calcium phosphate dihydrate; as well as tooth cleaning preparations containing the stabilized dibasic calcium phosphate dihydrate.

Abstract: A process for stabilizing dibasic calcium phosphate dihydrate against hydrolysis comprising treating an aqueous suspension of dibasic calcium phosphate dihydrate at a pH of from 5 to 10 with an azacycloalkane-2,2-diphosphonic acid of the formula ##STR1## WHEREIN N IS AN INTEGER FROM 3 TO 5, OR A WATER-SOLUBLE SALT THEREOF, IN AN AMOUNT OF FROM 0.01% TO 5% BY WEIGHT WITH REFERENCE TO THE DIBASIC CALCIUM PHOSPHATE DIHYDRATE; AS WELL AS TOOTH CLEANING PREPARATIONS CONTAINING THE STABILIZED DIBASIC CALCIUM PHOSPHATE DIHYDRATE.

Abstract: A process for stabilizing anhydrous dibasic calcium phosphate against reaction with fluorine ions comprising treating an aqueous suspension of anhydrous dibasic calcium phosphate at a pH of from 5 to 10 with an azacycloalkane-2,2-diphosphonic acid of the formula ##STR1## wherein n is an integer from 3 to 5, or a water-soluble salt thereof, in an amount of from 0.01% to 5% by weight with reference to the anhydrous dibasic calcium phosphate; as well as tooth cleaning preparation containing the stabilized anhydrous dibasic calcium phosphate.RELATED ARTAnhydrous dibasic calcium phosphate having the formula CaHPO.sub.4 is a polishing substance frequently utilized in tooth cleaning preparations as, for example, toothpastes and powders. For this purpose it may be used alone or in admixture with other polishing substances as, for example, silica gel or plastics cleaning substances.

Abstract: A process for stabilizing anhydrous dibasic calcium phosphate against reaction with fluorine ions comprising treating an aqueous suspension of anhydrous dibasic calcium phosphate at a pH of from 5 to 10 with 3-amino-1-hydroxypropane-1,1-diphosphonic acid, or a water-soluble salt thereof, in an amount of from 0.01% to 5% by weight with reference to the anhydrous dibasic calcium phosphate; as well as tooth cleaning preparations containing the stabilized anhydrous dibasic calcium phosphate.

Abstract: Pyrrolidone-5,5-diphosphonic acids having the formula ##STR1## wherein R is a member selected from the group consisting of hydrogen and alkyl having from 1 to 6 carbon atoms; as well as their water-soluble salts. The pyrrolidone-5,5-diphosphonic acids are excellent sequestering agents especially for alkaline earth metal ions. They are stabilizers for percompounds and are useful in the delaying of the setting times for gypsum. In addition, the compounds are useful as cosmetic preparations such as toothpastes and mouthwashes where they prevent formation of tartar and plaque and are useful in therapy in the treatment of diseases related to the abnormal deposition or dissolution of difficultly soluble calcium salts in the animal body.

Abstract: Process for the preparation of 1-aminoalkane-1,1-diphosphonic acids of the formula ##STR1## in which R.sub.1 represents a member selected from the group consisting of alkyl with 1 to 20 carbon atoms, phenyl, phenylalkyl with 7 to 12 carbon atoms, alkylphenyl with 7 to 12 carbon atoms, and in which R.sub.2 represents a member selected from the group consisting of hydrogen and alkyl with 1 to 4 carbon atoms, consisting essentially of reacting adducts of a hydrogen halide selected from the group consisting of HCl and HBr to a corresponding carboxylic acid amide of the formulaR.sub.2 --NH--CO--R.sub.1wherein R.sub.1 and R.sub.2 have the above-assigned meanings, with phosphorus acid; and recovering said 1-aminoalkane-1,1-diphosphonic acids.

Abstract: Azacycloalkane-2,2-diphosphonic acids having the formula ##EQU1## wherein R is a member selected from the group consisting of hydrogen and alkyl having from 1 to 3 carbon atoms and n is an integer from 3 to 5; as well as their water-soluble salts. The azacycloalkane-2,2-diphosphonic acids are excellent sequestering agents especially for alkaline earth metal ions. They are stabilizers for percompounds and are useful in the delaying of the setting times for gypsum.In addition, the compound are useful in cosmetic preparations such as toothpastes and mouthwashes where they prevent formation of tartar and plaque and are useful in therapy in the treatment of diseases related to the abnormal deposition or dissolution of difficultly soluble calcium salts in the animal body.

Abstract: Therapeutic methods employing cyclic aminophosphonic acids having the formula ##EQU1## wherein R is a member selected from the group consisting of hydrogen and alkyl having from 1 to 6 carbon atoms and n is an integer from 1 to 4; as well as their water-soluble salts. The cyclic aminophosphonic acids are excellent sequestering agents especially for alkaline earth metal ions, useful in cosmetic preparations such as toothpastes and mouthwashes where they prevent formation of tartar and plaque and in therapy in the treatment of diseases related to the abnormal deposition or dissolution of difficulty soluble calcium salts in the animal body.

Abstract: A process for the production of 1-aminoalkane-1,1-diphosphonates of the formula ##SPC1##Wherein R.sub.1 is a member selected from the group consisting of hydrogen, lower alkyl and phenyl, R.sub.2 and R.sub. 3 are members selected from the group consisting of hydrogen, alkyl having 1 to 22 carbon atoms, cycloalkyl having 5 to 6 carbon atoms, phenyl, alkylphenyl having 7 to 18 carbon atoms, phenylalkyl having 7 to 18 carbon atoms and together with the nitrogen atom, piperidino, pyrrolidino and morpholino, and X is a member selected from the group consisting of hydrogen, alkali metal, ammonium, pyridinium, guanidinium and mono-, di-, and tri-lower-alkanol-ammonium with the proviso that at least one of R.sub.1, R.sub.2 and R.sub.

Abstract: Pyrrolidone-5,5-diphosphonic acids having the formula ##EQU1## wherein R is a member selected from the group consisting of hydrogen and alkyl having from 1 to 6 carbon atoms; as well as their water-soluble salts. The pyrrolidone-5,5-diphosphonic acids are excellent sequestering agents especially for alkaline earth metal ions. They are stabilizers for percompounds and are useful in the delaying of the setting times for gypsum. In addition, the compounds are useful as cosmetic preparations such as toothpastes and mouthwashes where they prevent formation of tartar and plaque and are useful in therapy in the treatment of diseases related to the abnormal deposition or dissolution of difficultly soluble calcium salts in the animal body.

Abstract: The invention relates to a process for the prevention of inorganic salt precipitations in water or aqueous solutions by the additions to the solutions of small amounts of N-substituted aminoalkane-1,1-diphosphonic acids or their alkali metal salts or ammonium salts.

Abstract: Azacycloalkane-2,2-diphosphonic acids having the formula ##EQU1## wherein R is a member selected from the group consisting of hydrogen and alkyl having from 1 to 3 carbon atoms and n is an integer from 3 to 5; as well as their water-soluble salts. The azacycloalkane-2,2-diphosphonic acids are excellent sequestering agents especially for alkaline earth metal ions. They are stabilizers for percompounds and are useful in the delaying of the setting times for gypsum.In addition, the compound are useful in cosmetic preparations such as toothpastes and mouthwashes where they prevent formation of tartar and plaque and are useful in therapy in the treatment of diseases related to the abnormal deposition or dissolution of difficulty soluble calcium salts in the animal body.