POUDRE NOUVELLE TRAITEE EN SURFACE

• Main Authors: HORINO MASAAKIRA, ARAKAWA TAKESHI
• Format: Patent
• Language: French
• Published: 09.05.2008
• Subjects: ADHESIVES; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; DYES; GENERAL PROCESSES OF COMPOUNDING; HUMAN NECESSITIES; HYGIENE; MEDICAL OR VETERINARY SCIENCE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; POLISHES; PREPARATION OF CARBON BLACK; PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES; SPECIFIC USE OF COSMETICS OR SIMILAR TOILETPREPARATIONS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS,TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES; WORKING-UP

A surface of particles of at least one powder selected from PMMA, nylon, polystyrene, a silicone elastomer powder, benzoguanamine, a styrenedivinylbenzene pinhole polymer, ethylene tetrafluoride, a polyethylene powder, a polyurethane powder, a silk powder, an organic pigment and a composite of at least one of these and a metal oxide and/or a metal hydroxide is treated with a low-molecular organosilicon derivative, with or without a water-soluble cationic polymer to improve the hydrophilicity of the powder. The thus-treated powder is quite excellent in dispersibility (readily dispersible) in an aqueous dispersion medium, especially an aqueous dispersion medium in acidic and alkaline conditions, specifically with pH from 3 to 13 and in dispersion stability. The use of the surface-treated powder provides a dispersion, preferably dispersion for cosmetic, excellent in dispersibility and dispersion stability and the like. The use of the surface-treated powder, or the use of the dispersion provides further a cosmetic excellent in dispersibility and dispersion stability and further in re-dispersibility and dispersion stability with lapse of time when selecting aqueous cosmetic as an agent form.