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公开(公告)号：DE4305276A1
公开(公告)日：1994-08-25
申请号：DE4305276
申请日：1993-02-20
Applicant: HOECHST AG
Inventor： DANY FRANZ-JOSEF DIPL CHEM DR , KALTEYER GERHARD , NOLTE GERHARD DIPL CHEM DR , PRELL HEDWIG , SCHROEDTER HERMANN DIPL CHEM D
Abstract: In the process for preparing dicalcium phosphate dihydrate having a good fluoride compatibility and stability to hydrolysis, which when used in toothpaste effects an as small as possible further thickening, by reaction of calcium carbonate suspended in water with an aqueous solution of orthophosphoric acid, precipitation onto this of dimagnesium phosphate trihydrate as stabiliser by reacting aqueous solutions of a magnesium salt and of orthophosphoric acid in the presence of a basic compound and also subsequent addition of tetrasodium pyrophosphate as further stabiliser to the reaction mixture and subsequent filtration, drying and milling of the precipitate, from 0.2 to 0.6 % by weight of tetrasodium pyrophosphate, calculated on the basis of the dicalcium phosphate dihydrate precipitated in the reaction mixture, is added to the aqueous reaction mixture.
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公开(公告)号：DE59402697D1
公开(公告)日：1997-06-19
申请号：DE59402697
申请日：1994-02-04
Applicant: HOECHST AG
Inventor： DANY FRANZ-JOSEF DR , KALTEYER GERHARD , NOLTE GERHARD DR , PRELL HEDWIG
Abstract: In the process for the preparation of dicalcium phosphate dihydrate having good fluoride (fluorine) compatibility and hydrolytic stability, which effects further thickening which is as low as possible when it is used in toothpastes, by reaction of calcium carbonate suspended in water with an aqueous solution of orthophosphoric acid, precipitation of dimagnesium phosphate trihydrate as stabiliser by reaction of aqueous solutions of a magnesium salt and of orthophosphoric acid in the presence of a basic compound, and also subsequent filtration, drying and milling of the precipitate, there is added to the reaction mixture as further stabiliser from 0.2 to 0.8 % by weight of polyphosphoric acid, calculated on the basis of the dicalcium phosphate dihydrate precipitated in the reaction mixture.
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公开(公告)号：DE3705845A1
公开(公告)日：1988-09-01
申请号：DE3705845
申请日：1987-02-24
Applicant: HOECHST AG
Inventor： DANY FRANZ-JOSEF DIPL CHEM DR , KLASSEN HORST DIPL CHEM DR , ADRIAN RENATE DIPL ING , PRELL HEDWIG , KALTEYER GERHARD
Abstract: Toothpastes which contain, as a cleansing agent, a cleansing agent consisting essentially of dicalcium phosphate dihydrate having an adsorptivity of more than 60 g H2O/100 g of cleansing agent.
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公开(公告)号：CA995875A
公开(公告)日：1976-08-31
申请号：CA181845
申请日：1973-09-25
Applicant: HOECHST AG
Inventor： WORTMANN JOACHIM , DANY FRANZ-JOSEF , PRELL HEDWIG , KANDLER JOACHIM
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Patent Agency Ranking
公开(公告)号：DE59401053D1
公开(公告)日：1997-01-02
申请号：DE59401053
申请日：1994-01-19
Applicant: HOECHST AG
Inventor： DANY FRANZ-JOSEF DR , KALTEYER GERHARD , NOLTE GERHARD DR , PRELL HEDWIG , SCHROEDTER HERMANN DR
Abstract: In the process for preparing dicalcium phosphate dihydrate having a good fluoride compatibility and stability to hydrolysis, which when used in toothpaste effects an as small as possible further thickening, by reaction of calcium carbonate suspended in water with an aqueous solution of orthophosphoric acid, precipitation onto this of dimagnesium phosphate trihydrate as stabiliser by reacting aqueous solutions of a magnesium salt and of orthophosphoric acid in the presence of a basic compound and also subsequent addition of tetrasodium pyrophosphate as further stabiliser to the reaction mixture and subsequent filtration, drying and milling of the precipitate, from 0.2 to 0.6 % by weight of tetrasodium pyrophosphate, calculated on the basis of the dicalcium phosphate dihydrate precipitated in the reaction mixture, is added to the aqueous reaction mixture.
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公开(公告)号：DE4306673A1
公开(公告)日：1994-09-08
申请号：DE4306673
申请日：1993-03-04
Applicant: HOECHST AG
Inventor： DANY FRANZ-JOSEF DIPL CHEM DR , KALTEYER GERHARD , NOLTE GERHARD DIPL CHEM DR , PRELL HEDWIG
Abstract: In the process for the preparation of dicalcium phosphate dihydrate having good fluoride (fluorine) compatibility and hydrolytic stability, which effects further thickening which is as low as possible when it is used in toothpastes, by reaction of calcium carbonate suspended in water with an aqueous solution of orthophosphoric acid, precipitation of dimagnesium phosphate trihydrate as stabiliser by reaction of aqueous solutions of a magnesium salt and of orthophosphoric acid in the presence of a basic compound, and also subsequent filtration, drying and milling of the precipitate, there is added to the reaction mixture as further stabiliser from 0.2 to 0.8 % by weight of polyphosphoric acid, calculated on the basis of the dicalcium phosphate dihydrate precipitated in the reaction mixture.
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公开(公告)号：DE3867499D1
公开(公告)日：1992-02-20
申请号：DE3867499
申请日：1988-02-03
Applicant: HOECHST AG
Inventor： DANY FRANZ-JOSEF DR , KLASSEN HORST DR , ADRIAN RENATE , PRELL HEDWIG , KALTEYER GERHARD
Abstract: Toothpaste contains an abrasive agent (A) consisting mainly of dicalcium phosphate dihydrate (I) and having adsorptive capacity (AC) over 60g/100g agent. (A) contains 98-98 wt.% CaHPO4.2H2O, the balance MgHPO4.3H2O and Na pyrophosphate. The agent has max. particle size 100 microns and size distribution 99.95% below 75 microns; 99% below 45 microns and 50% below 20 microns.
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公开(公告)号：CA1090531A
公开(公告)日：1980-12-02
申请号：CA288991
申请日：1977-10-19
Applicant: HOECHST AG
Inventor： DANY FRANZ-JOSEF , KANDLER JOACHIM , PRELL HEDWIG , WORTMANN JOACHIM , ZIEGLER HANS W
Abstract: STABILIZATION OF CALCIUM HYDROGEN PHOSPHATE DIHYDRATE. Dicalcium phosphate dihydrate is stabilized with the use of dimagnesium phosphate trihydrate, the dicalcium phosphate dihydrate being precipitated by reacting a calcium compound with an aqueous solution of orthophosphoric acid or a phosphoric acid salt. More specifically, 1 to 50 weight% based on dicalcium phosphate dihydrate, of dimagnesium phosphate trihydrate is co-precipitated with the dicalcium phosphate dihydrate, or subsequently on precipitated dicalcium phosphate dihydrate by reacting a magnesium salt with a solution of orthophosphoric acid or of a phosphoric acid salt in the presence of a basic compound.
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