Cosmetics and process for preparation thereof
Spherical granules of porous silica or silicate, process for the production thereof, and applications thereof Patent #: 5342876
ApplicationNo. 670240 filed on 06/17/1996
US Classes:423/339By precipitating
ExaminersPrimary: Bos, Steven
Assistant: Hendrickson, Stuart L.
Attorney, Agent or Firm
International ClassC01B 033/12
Foreign Application Priority Data1993-12-28 JP
AbstractA method of directly precipitating a spherical amorphous silica in a high yield by adding a carboxymethyl cellulose (CMC) as a coagulation growing agent in a step of neutralizing the alkali silicate with an acid. The CMC having a particular etherification degree and a particular polymerization degree is added in an amount of from 1 to 100% by weight reckoned as SiO2 with respect to silica in the alkali silicate, whereby the whole silica particles turn into spherical amorphous silica particles having high sphericalness. There can be obtained spherical amorphous silica particles having a BET specific surface area of from 25 to 800 m2 /g, an apparent specific gravity of from 0.1 to 0.8 and a particle diameter of from 0.2 to 50 μm cheaply and in a high yield.