METHOD FOR MASS POLYMERISATION OF ISOPRENE IN LOW-VOLUME CELLS Russian patent published in 2015 - IPC C08F136/08 C08F136/04 C08F2/01 C08F2/02 C08F4/54 

FIELD: chemistry.

SUBSTANCE: described method for mass polymerisation of isoprene in low-volume cells. The method includes feeding a catalyst system acting in the presence of isoprene. The used catalyst system is a system based on a monomer, which is a conjugated diene, one salt of one or more rare-earth metals of organic phosphoric acid, one alkylating agent of formula AlR₃ or HalR₂ and one halogen donor, which is an alkylaluminium halide. A polyethylene film with thickness of 1-10 mcm is applied on a conveyor belt having hemisphere-shaped cells. The conveyor belt with the film is then heated to 80-120°C. The polyethylene film acquires a fluidity property and accurately repeats the shape of the cells of the conveyor belt. The conveyor belt with the adhered polyethylene film is then cooled by blowing with a cold inert gas. The catalyst system and the monomer are mixed in a mixer at temperature of -80 to -50 C° in ratio of 1/40000 to 1/200000 mol/mol. The ready mixture of the monomer and the catalyst system is then packed using a batcher into polymerisation cells with a volume of 0.01 to 1 dm³ without further mixing of the mixture. Mass polymerisation of the monomer is carried out in each separate cell at high pressure of 1-10 atm and temperature of -50 to +100°C for 90-5 min. The cells of the polyethylene film are sealed with micro-perforations. The cells are evacuated to strip the remaining unpolymerised monomer for 10-600 s. A modifying agent is fed. An antioxidant is fed into each cell. The finished cells with the polymer are removed from the conveyor and the cells with the polymer are divided on a drum with a wavy surface to form separate granules. The granules are unloaded for further packaging.

EFFECT: obtaining a product of high quality and high technological effectiveness, simple process of producing the product, low power consumption and metal consumption of the equipment, high environmental friendliness of production and improved working conditions.

1 dwg, 1 tbl, 10 ex