Process for Preparing Solid Particles of Phenolic Antioxidants

A process for preparing solid particles comprising an essentially crystalline form

• of a compound of the formula (I):
• Wherein
• One of R1 and R2 independently of one another represents hydrogen or C1-C4alkyl and the other one represents C3-C4alkyl;
• x represents zero (direct bond) or a numeral from one to three;
• and
• Y represents C8-C22alkoxy or groups of the partial formulae:
• Wherein
• One of R1′ and R2′ independently of one another represents hydrogen or C1-C4alkyl and the other one represents C3-C4alkyl;
• 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;
• or of a compound (II) selected from the group of organic phosphites and phosphonites,
• or of a mixture thereof,
• characterised in that solid particles are prepared from a melt of a compound (I) or from a melt of a compound (II) or from a melt of a mixture thereof, the solid particles are added to a mixture of an organic water-miscible solvent and water to form a dispersion, and the crystals obtained from the dispersion are separated.