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AssigneeShiseido Company, Ltd.
InventorsToshihiko Nakane, Masumi Koishi, Hiroshi Fukui, Yutaka Okunuki, Yoshio Yahata, Shigenori Kumagai, Hiroyuki Yokoyama, Eiichiro Yagi, Minoru Fukuda, Tadao Ohta, Fujihiro Kanda, Kazuhisa Ohno, Toshihide Ebisawa, Tomiyuki Nanba, Susumu Takada, Masato Hatao, Masaru Suetsugu
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A composite powder wherein an organic or inorganic core powder is substantially completely covered with one or more types of organic, inorganic, or metallic powders having an average particle size one-fifth or less of the average particle size of the above core powder by means of mixing and compression. The composite powder may be manufactured by mixing and compressing the above core powder and coating powder using a ball mill or other mixer charged with a ball shaped mixing medium of an average diameter of 5 mm or less. This composite powder may be used in, for example, skin treatment agent, makeup type cosmetics, sunburn preventing cosmetics, deodorants.
A composite powder comprising a core powder having an average particle size of 0.5 to 100 .mu.m substantially completely covered with a coating powder having an average particle size of one-fifth or less of the average particle size of the above-mentioned core powder, said core powder being at least one powder selected from the group consisting of polyamide resin, polyethylene resin, acrylic resin, polyester resin, fluorine resin and cellulose resin, and said coating powder being at least one coating powder selected from the group consisting of titanium dioxide, talc, kaolisite, zinc white, magnesium oxide, calcium oxide, barium sulfate, magnesium carbonate, calcium carbonate, silica, calcium secondary phosphate, iron oxide, chromium oxide, chromium hydroxide, ultramarine blue, prussian blue, hydroxyapatite, and silicon treated, activant treated and wax treated powder thereof, aluminum gold, silver, and iron powder and the halogen compounds thereof, said composite powder being produced by dry mixing and dry compressing the organic or inorganic powder constituting the core powder and one or more types of the organic, inorganic, or metallic powders constituting the coating powder, a mixer charged with a ball shaped mixing medium having an average diameter of at most 5 m being used to produce the composite powder.
A skin treatment agent comprising a spherical composite powder produced by dry mixing and dry compressing an organic or inorganic spherical core powder and hydroxyapatite coating powder, so that the spherical core powder having an average particle size of 0.5 to 100 microns is substantially completely covered by the coating powder having an average particle size of one-fifth or less of the average particle size of the above core powder, a mixer charged with a ball shaped mixing medium having an average diameter of at most 5 mm being used to produce the composite powder, said core powder being at least one powder selected from the group consisting of polyamide resin, polyethylene resin, acrylic resin, polyester resin, fluorine resin and cellulose resin, and said coating powder at least one coating powder selected from the group consisting of titanium dioxide, talc, kaolisite, zinc white, magnesium oxide, calcium oxide, barium sulfate, magnesium carbonate, calcium carbonate, silica, calcium secondary phosphate, iron oxide, chromium oxide, chromium hydroxide, ultramarine blue, prussian blue, hydroxyapatite, and silicon treated, activant treated and wax treated powder thereof, aluminum gold, silver, and iron powder and the halogen compounds thereof.
A makeup type cosmetic comprising a spherical composite powder produced by dry mixing and dry compressing a spherical core powder and a coating powder so as to substantially completely cover the spherical core powder having an average particle size of 0.5 to 100 .mu.m with the coating powder having an average particle size of one-fifth or less of the average particle size of the above-mentioned core powder, a mixer charged with a ball shaped mixing medium having an average diameter of at most 5 mm being used to produce the composite powder, said core powder being at least one powder selected from the group consisting of polyamide resin, polyethylene resin, acrylic resin, polyester resin, fluorine resin and cellulose resin, and said coating powder at least one coating powder selected from the group consisting of titanium dioxide, talc, kaolisite, zinc white, magnesium oxide, calcium oxide, barium sulfate, magnesium carbonate, calcium carbonate, silica, calcium secondary phosphate, iron oxide, chromium oxide, chromium hydroxide, ultramarine blue, prussian blue, hydroxyapatite, and silicon treated, activant treated and wax treated powder thereof, aluminum gold, silver, and iron powder and the halogen compounds thereof.
A composite powder wherein a polyethylene core powder having an average particle size of 0.5 to 100 .mu.m is substantially completely covered with a coating powder composed of silica having an average particle size of one-fifth or less of the average particle size of the above-mentioned core powder, said composite powder being produced by dry mixing and dry compressing said composite.
A process for the production of a composite powder comprising dry mixing and dry compressing a polyethylene core powder and silica, wherein a mixer charged with a ball shaped mixing medium having an average diameter of 0.5 .mu.m or less is used to produce a composite in which said core powder having an average particle size of 0.5 to 100 .mu.m is substantially completely covered by said silica having an average particle size of one-fifth or less of said polyethylene core powder.
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