| abstract |
The invention relates to the preparation of anionic polymerization initiators, in particular sodium dispersions for the synthesis of low molecular weight dienes, which can be used for the production of varnishes, paints, enamels, plasticization of rubbers. The invention makes it possible to increase the stability of the dispersion and the activity of the catalytic system. The dispersion of sodium is carried out in a solution of a low molecular weight copolymer in an amount of 60-350 wt.% With respect to sodium. Potassium alkoxides are then introduced with the general formula R {[CH 2 - (CH 3 ) CH-O] N (CH 2 CH 2 -O) M K} 3-5 , where N = 1-27n n n M = 0-4n n n R is the residue of glycerol, xylitol or ethylenediamine mol.m. 440-5110, in the amount of 58-360 wt.% With respect to sodium and the mixture is dispersed in the vortex field of metal particles with a mass ratio of metal particles and sodium from 3.0: 1 to 6.5: 1. In order to use a catalyst for the preparation of piperylene containing polymers, the process is carried out at a molar ratio of sodium to potassium of 2-20. 1 hp f-ly, 3 tab. |