METHOD FOR PREPARING SYNTHETIC GUTTA-PERCHA Russian patent published in 2007 - IPC C08F136/08 C08F4/642 

FIELD: chemistry of polymers, chemical technology.

SUBSTANCE: invention relates to a method for synthesis of polydienes on titanium-magnesium catalysts and can be used in synthesis of synthetic gutta-percha. Synthetic gutta-percha is synthesized by polymerization of isoprene in aliphatic solvent medium in the presence of catalytic system consisting of titanium-magnesium catalyst and co-catalyst representing trialkylaluminum. Titanium trichloride co-crystallized with magnesium dichloride is used as titanium-magnesium catalyst. Catalyst is prepared by interaction of magnesium with titanium tetrachloride in the presence of n-butyl chloride at 60-100°C, in the volume ratio titanium tetrachloride : n-butyl chloride = 1:(53-80) and in the content of magnesium 3.5-5.5 g per 1 ml of titanium tetrachloride. The polymerization process of isoprene is carried out at temperature 30-65°C, at the isoprene concentration in polymerization medium 1.0-2.0 mole/l and at the mole ratio co-catalyst : catalyst = 10-20, inclusively. Method provides carrying out the process for a single step and without washing out that simplified a method for synthesis of polymer that represents highly dispersed crumbs and reduces consumptions. Invention can be used in synthesis of synthetic gutta-percha.

EFFECT: improved method of synthesis.

4 cl, 2 tbl, 8 ex