Patent ID: 7262319

Claim:
A process for preparing solid particles comprising in essentially crystalline form a compound of the formula: wherein one of R 1 and R 2 independently of one another represents hydrogen or C 1 –C 4 alkyl and the other one represents C 3 –C 4 alkyl; x represents zero (direct bond) or a numeral from one to three; and Y represents C 8 –C 22 alkoxy; or groups of the partial formulae wherein one of R 1 ′ and R 2 ′ independently of one another represents hydrogen or C 1 –C 4 alkyl and the other one represents C 3 –C 4 alkyl; x represents zero (direct bond) or a numeral from one to three; y represents a numeral from two to ten: and z represents a numeral from two to six, characterised in that a homogeneous aqueous dispersion is prepared, which comprises the compound (I) or a mixture thereof, wherein R 1 , R 2 , R 1 ′, R 2 ′, Y, x, y and z are as defined above, crystals are formed by the addition of a fatty acid partial ester of polyoxyethylene sorbitan and seed crystals and the crystals obtained are separated from the dispersion.