公开(公告)号：CA1182050A

公开(公告)日：1985-02-05

申请号：CA400805

申请日：1982-04-08

Applicant: DEGUSSA

Inventor： MULLER KARL-HANS ,  NEUMULLER MATTHIAS ,  TURK GUNTHER

IPC: A61K8/00 ,  A61K8/25 ,  A61K8/86 ,  A61Q11/00 ,  A61K7/16

Abstract: The present invention provides dentifrices having improved storage life with regard to rheology and abrasiveness and containing as cleaning agents for the first time bifunctional precipitated silicas (acting as thickeners and abrasives). These precipitated silicas are characterized by the following physicochemical characteristic data: Bowl mill Micronizer BET surface area sqm/g 15-110 15-110 Tamped powder density g/l 150-750 90-650 Secondary particle size distribution curve as determined by the Coulter counter Fig. 1 Fig. 2 "ALPINE" retained on sieve >63 .mu.m % by weight

公开(公告)号：BR8202033A

公开(公告)日：1983-03-22

申请号：BR8202033

申请日：1982-04-07

Applicant: DEGUSSA

Inventor： MULLER KARL HANS ,  NEUMULLER MATTHIAS ,  TURK GUNTHER

IPC: A61K8/00 ,  A61K8/25 ,  A61K8/86 ,  A61Q11/00 ,  A61K7/16

Abstract: A dental-care composition having improved shelf life in respect of rheology and abrasiveness, which as a novel feature, contains, as a cleansing agent, a bifunctional (thickening and abrasive) precipitated silica characterized by the following physico-chemical properties: -Pendulum - roller - mill Jet mill -BET surface area m2/g 15-110 15-110 -Tamped density g/l 150-750 90-650 -Secondary particle size FIG. 1 FIG. 2 -distribution according to -Coulter Counter -"ALPINE" screen % by 63 mu m weight -Cu abrasion in 10% mg 5-30 5-30 -strength glycerol disper- -sion -Lightness value A % 86-96 90-96 -Viscosity in a 30% 30,000-60,000 30,000-60,000 -strength dispersion in a -1:1 glycerol/water -mixture, Brookfield RTV, -Sp5 - The dental-care composition may additionally contain 0.5-5% by weight of polyethylene glycol or 2-14% by weight of a precipitated silica which in 15% strength dispersion in a glycerol/water mixture has a viscosity of not less than 30,000 mPa.s. Pyrogenic silica can also be employed successfully to regulate the viscosity of the product.

公开(公告)号：BR8202032A

公开(公告)日：1983-03-22

申请号：BR8202032

申请日：1982-04-07

Applicant: DEGUSSA

Inventor： NAUROTH PETER ,  KUHLMANN ROBERT ,  TURK GUNTHER ,  BECKER ADAM

IPC: C01B33/20 ,  A61K8/00 ,  A61K8/25 ,  A61Q11/00 ,  C01B33/187 ,  C01B33/193 ,  C01B37/02 ,  C08K3/00 ,  C08K3/34 ,  C08K3/36 ,  C08K7/18 ,  C08L7/00 ,  C08L21/00 ,  C09C1/30 ,  C01B33/12

Abstract: Precipitated silicas which have the following physicochemical characteristics, depending on the manner in which they are milled: -Pendulum -roller mill Jet mill -BET m2/g 15-110 15-110 -surface -area -Tamped g/l 150-750 90-650 -den- -sity -Cu abrasion in 10% mg 5-30 5-30 -strength glycerol -dispersion -Lightness % 86-96 90-96 -value -A -Particle size dis- as in FIG. 1 as in FIG. 2 -tribution curve -determined by a -Coulter Counter -"ALPINE screen retain- % by 63 mu m weight -Viscosity of a 30% mPa.s 30,000 to 60,000 -strength dispersion in -a 1:1 glycerol/water -mixture (Brookfield -RTV, Sp5) - are prepared by diluting a precipitated silica original suspension obtained according to German Published Application DAS 1,467,019 and simultaneously adding alkali metal silicate solution, sulfuric acid and water while keeping the pH constant between 7 and 9. The precipitated silica is then filtered off, washed, dried and milled using a pendulum roller mill or a jet mill. Because of their abrasiveness, the precipitated silicas can be employed as cleansing and abrasive agents and, in the case of the jet-milled product, also as a polishing agent, abrasive and thickener in toothpastes.