Patent · US Active

Preparation of nanoscalar UV absorbers

US8393556B2 · kind B2 · utility

1Cited by

2References

15Claims

0Family size

Assignee

BASF SE

Inventors

Stefan Muller · Weil am Rhein, DE
Bernd Herzog · Weil am Rhein, DE

Key dates

Filing date	Jun 27, 2008
Grant date	Mar 12, 2013
Priority date	—
Expiry date	Mar 3, 2029

Classification

Technology area (CPC A)Human Necessities
CPC primaryA61K2800/413
WIPO fieldPharmaceuticals
WIPO sectorChemistry

Abstract

Disclosed is a method of preparing a composition, comprising a micronized insoluble organic UV absorber, which method comprises grinding the insoluble organic UV absorber, in coarse particle form, in a grinding apparatus comprising yttrium-stabilized zirconium oxide grinding beads, in the presence of alkyl polyglucoside having the formula CnH2n+1O(C6H10O5)xH, in which n is an integer ranging from 8 to 16 and x is the mean polymerisation level of the glucoside moiety (C6H10O5) and ranges from 1.4 to 1.6, or an ester thereof and in the presence of an antifoam agent as dispersingagent auxiliary.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.