POLYPROPYLENE AND PROPYLENE COPOLYMER PRODUCTION PROCESS Russian patent published in 2007 - IPC C08F10/06 C08F110/06 C08F4/642 

FIELD: polymer production.

SUBSTANCE: invention describes process of producing propylene-based polymer via polymerization of monomer in hydrocarbon solvent at 20-80°C and excessive pressure 1 to 30 atm in presence of catalyst and hydrogen as polymer molecular mass regulator, said catalyst being a product obtained by preliminary treatment of titanium trichloride and diethylaluminum chloride with propylene carried out at weight ratio Et₂AlCl/TiCl₃ = 1 to 10 determined by density of layer of initial TiCl₃ particles within the following limits: 1-2 at density below 0.46 g/cc, 3-5 at density 0.46-0.50 g/cc, 6-10 density above 0.50 g/cc. When polypropylene is obtained, preliminary treatment of titanium trichloride and diethylaluminum chloride with propylene is carried out to achieve conversion 2.0-3.0 g polymer per 1 g TiCl₃ and, when propylene/ethylene copolymer is obtained, treatment is carried out to achieve conversion 3.0-4.0 g polymer per 1 g TiCl₃. After termination of pretreatment of titanium trichloride and diethylaluminum chloride with propylene and before measuring out pretreatment product into principal polymerization reactor, weight ratio Et₂AlCl/TiCl₃ is adjusted to fall into range 6-10 through additionally dosing calculated quantity of diethylaluminum chloride.

EFFECT: prevented breaking of catalyst particles, preserved high activity and stereospecifity thereof, and increased productivity of process.

2 cl, 2 tbl, 18 ex