Mesoporous zinc oxide powder and method for production thereof

A - Human Necessities – 61 – K

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Details

A61K 8/27 (2006.01) A61Q 17/04 (2006.01) C01G 9/02 (2006.01) C09C 1/04 (2006.01)

Patent

CA 2710957

A zinc oxide powder is described, which, when used in a dispersion at a concentration of at least 50 wt% of zinc oxide, produces a transparent composition having a total visible transmittance through a path length of 20 microns at 550nm of at least one of; at least 70%, at least 75%, at least 80% or at least 85%. The powder has a number average zinc oxide aggregate size of at least 0.8 microns, at least 1 micron, at least 2 microns or at least 3 microns. Use of the zinc oxide powder reduces the risk of transdermal penetration.

La présente invention concerne une poudre d'oxyde de zinc produisant, lorsqu'elle est utilisée dans une dispersion à une concentration d'au moins 50 % en poids d'oxyde de zinc, une composition transparente ayant une transmittance visible totale dans une longueur de trajet de 20 microns à 550 nm d'au moins 70 %, d'au moins 75 %, d'au moins 80 % ou d'au moins 85 %. La poudre a une taille moyenne en nombre d'agrégats d'oxyde de zinc d'au moins 0,8 micron, d'au moins 1 micron, d'au moins 2 microns ou d'au moins 3 microns. L'utilisation de la poudre d'oxyde de zinc réduit le risque de pénétration transdermique.

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