摘要:
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 m.sup.2 /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 dispersion 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, Sp 5 ______________________________________ 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.
摘要:
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 m.sup.2 /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.
摘要:
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 m.sup.2 /g 15-110 15-110 Tamped density g/1 150-750 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.
摘要:
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 m.sup.2 /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.
摘要:
The toothpaste for preventative oral hygiene contains a mixture of synthetically prepared precipitated silicic acid and perlite in addition to a solvent as cleaning body.A mixture consisting of glycerol (86%) and water is used as solvent.
摘要:
There is produced a hydrophobic mixture for RTV and LTV silicone rubber by applying a hydrophobizing agent to a precipitated silica, homogeneously mixing this powdery concentrate into a pyrogenically produced silica, tempering the mixture and mechanically compacting. The hydrophobic filler mixture obtained in the untempered condition consists of:Pyrogenically produced silica: 50 to 85 weight %Precipitated silica: 5 to 40 weight % (e.g. 5 to 30 weight %)Hydrophobization agent: 8 to 30 weight %Aluminum oxide: 0.5 to 5 weight %.
摘要:
There is provided a process for improving mineral asphaltic coatings for streets and roadways comprising preparing a mixture to be used as the base mineral asphalt coating material, homogeneously mixing in 0.1 to 10 weight % of silica which is either (1) a precipitated silica, (2) a precipitated and spray dried silica or (3) a pyrogenically produced silica and further working this mixture into a mineral asphalt coating for streets and roadways.
摘要:
Mastic asphalt mixture for road, building and industrial construction, which contains 0.1 to 2% by weight of silica. For example, a precipitated silica, a precipitated and spray dried, or a pyrogenously produced silica may be used as a synthetic silicic acid. The content of synthetic silica produces an essentially higher degree of hardness in the finished mastic asphalt layer.
摘要:
Bitumen granulate containing from 0.5 to 15% by weight, preferably from 6.1 to 15% by weight, of a powdering and separating agent such as, for example, synthetic silica or carbon black is produced by atomizing hot, liquid bitumen in a spray mixer and at the same time introducing the powdering and separating agent into the spray mixer by way of the stream of cold air.
摘要:
Precipitated, jet ground silica with specific physical-chemical properties is mixed with silicone oil, homogenized and heated to produce an antifoam agent. This type of antifoam agent can be used in pharmacy, in producing foam stopping latex emulsion, in the food field, in washing formulations, in the textile industry as well as in the pigment and varnish industries.