Drug – bio-affecting and body treating compositions – Face or body powders for grooming – adorning – or absorbing
Patent
1996-09-13
1998-06-23
Mosley, Terressa
Drug, bio-affecting and body treating compositions
Face or body powders for grooming, adorning, or absorbing
424400, 424401, 514951, A61K 7035
Patent
active
057701873
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INDUSTRIAL APPLICATION
The present invention relates to a porous particulate which is useful in skin cosmetics (antiperspirants, deodorants, packs and humectants), hair care products, drugs, fiber treatments, paper coatings, cement additives, covering materials, bactericides/bacteriostats and agricultural chemicals.
PRIOR ART
The anionic/cationic amphoteric particulate derived through emulsification, suspension or the like is generally obtained by copolymerization of a monomer having an amino group and a monomer having an acidic group, or first forming an anionic or a cationic particulate and subsequently conducting a modification reaction to thereby convert a part of the reactive groups to cationic or anionic groups, or effecting compounding to thereby render cationic and anionic substances copresent.
These techniques, however, do not give a porous particulate, and the amount of basic and acid groups per particle which react with strong acids and bases is extremely small.
Further, processes for producing particulates with the use of natural raw materials include those in which chitosan having a primary amino group as a base is dissolved in an acid and the resultant solution is dropped into an alkaline coagulation fluid and those in which chitosan solutions or dispersions are mechanically treated. However, all the obtained particulates are cationic, and only particles with a diametrical size of tens to hundreds of micrometers or more can be obtained thereby. Still further, a granular complex of chitosan and an organic acid polymer is synthesized by a technique in which an organic acid having a reactive vinyl group is (co)polymerized in the presence of chitosan in an aqueous solution among various known techniques for producing amphoteric particles from basic polysaccharides as bases (see Kobunshi Ronbunshu (Reports of Polymer Science), Vol. 37, No. 3, 185 (1980)). However, the chitosan particulate produced by the above technique has a broad particle size distribution and only nonspherical particles containing particles with a size of 50 .mu.m or greater can be obtained. Furthermore the porosity thereof is low.
Thus, no amphoteric porous particulate capable of adsorbing a large amount of an acid or base stronger than the acid or basic groups thereof and having an average particle size of 50 .mu.m or less has been obtained.
If the above porous particulate capable of adsorbing a large amount of a strong acid or base is obtained, it would be useful in deodorants and the like with the use of the adsorptiyity thereof.
Body smells such as axillary, foot and sweat smells are unpleasant and serious distress to those having such smells. The components of body smells are metabolites produced by the action of resident bacterial flora of the skin upon smell-causing sweat, egesta, putrefied matter and the like. Thus, although the secreted sweat per se does not cause strong smell, it generates lower carboxylic acids and volatile matter, which cause offensive smells, by the action of the resident bacterial flora of the skin. It is known that the foul-smelling matter may be various and, for example, composed of a lower carboxylic acid such as acetic, butyric, propionic or isovaleric acid or a steroid.
Examples of the techniques for inhibiting the above body smells include a method (1) in which use is made of a metallic oxide such as zinc oxide, magnesium oxide, titanium oxide or alumina, a method (2) in which the physical adsorption of a porous substance such as active carbon is utilized, a method (3) in which use is made of an antibacterial drug capable of inhibiting the proliferation of the resident bacterial flora of the skin (for example, triclosan, isopropylmethylphenol, benzalkonium chloride, chlorhexidine, chlorhexidine gluconate or halocarban), a method (4) in which use is made of a strongly astringent drug (for example, zinc p-phenolsulfonate, citric acid, aluminum salt or zirconium salt), and masking by perfumes (5).
However, the physical deodorization using active carbon or the like has drawbacks no
REFERENCES:
Kobunshi Ronbunshu, vol. 37, No. 3, pp. 185-190 (Mar., 1980).
Fukumoto Yasuhisa
Furukawa Makoto
Hasebe Yoshihiro
Ito Yasushi
Kodama Kenji
Kao Corporation
Mosley Terressa
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