METHOD OF PRODUCING BLOCK COPOLYMER OF PROPYLENE AND ETHYLENE Russian patent published in 2011 - IPC C08F297/08 C08F210/06 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing organic high-molecular weight compounds, methods of producing block copolymers of propylene and ethylene used in making different articles for structural purposes through extrusion and casting. Described is a method of producing a block copolymer of propylene and ethylene, where in a secondary reactor filled with a polypropylene suspension from the primary reactor, concentration of propylene [M₃], defined by the expression [M₃]=a·[PP], where [PP] is concentration of polypropylene in the suspension, coefficient a>0.1. Ethylene in the secondary reactor is fed in at least two steps, where at the first step, the amount m₁ and flow rate q₁ are defined by the expression m₁=b₁·m_p and q₁=c₁·m₁, where m_p is the mass of propylene in the secondary reactor before feeding ethylene. Coefficients b₁ and c₁ are equal to 0.3 and 0.08, respectively. At the second step, the amount m₂ and flow rate of ethylene q₂ are defined by the expressions m₂=b₂·m₁ and q₂=c₂·q₁. Coefficients b₂ and c₂ assume values (2-2.5) and (0.6-0.8), respectively.

EFFECT: improvement and stabilisation of quality factors of block copolymers of propylene and ethylene during fluctuation of quality factors of batches of industrial raw materials: catalyst, solvent, monomers etc.

2 cl, 1 dwg, 7 tbl, 14 ex