| 摘要 |
FIELD: chemistry. ^ SUBSTANCE: invention relates to improved method of preparing solid particles used as phenolic antioxidants and including in, in fact, crystal form compound of formula: in which one of R1 and R2 independently on each other represent hydrogen atom or C1-C4alkyl, and the other one represents C3-C4alkyl; x represents zero (direct bond) or number from one to three; and Y represents C8-C22alkoxy or groups of incomplete formulas ^ or in which one of R1' and R2' independently on each other represent hydrogen atom or C1-C4alkyl, and the other one represents C3-C4alkyl; x represents zero (direct bond) or number from one to three; y represents number from two to ten; and z represents number from two to six, in which homogeneous water dispersion is prepared, which includes compound (I) or mixture of such compounds, where R1, R2, R1' R2', Y, x, y and z have values given above, by addition of incomplete ether of fatty acid polyoxyethylene sorbitan and inoculating crystals, and obtained crystals are separated from dispersion and process is carried out until solid particles are obtained. Invention also relates to novel crystal forms pentaerythrite tetrakis-[3-(3,5-ditret-butyl-4-hydroxyphenyl)propionate], (-form) of pentaerythrite tetrakis 3-(3,5-ditret-butyl-4-hydroxyphenyl)propionate], crystal form of N,N'-hexane-1,6-diyl-bis-[3-(3,5-ditret-butyl-4-hydroxyphenyl propionamide)], crystal form of N,N'-hexane-1,6-diyl-bis-[3-(3,5-ditret-butyl-4-hydroxyphenyl propionamide)] and crystal modification (-form) of N,N'-hexane-4,6-diylbis-[3-(3,5-ditret-butyl-4- hydroxyphenyl propionamide)]. ^ EFFECT: elaboration of improved method of preparing solid particles used as phenolic antioxidants. ^ 10 cl, 2 ex |
