PROPYLENE RANDOM COPOLYMER, METHOD OF PREPARATION THEREOF, AND COPOLYMER PRODUCTS Russian patent published in 2007 - IPC C08F297/08 C08F210/06 C08F210/16 C08L23/14 C08J5/12 

FIELD: polymer production.

SUBSTANCE: invention, in particular, relates to random copolymer of propylene with ethylene or α-olefin containing at least four carbon atoms. Polymerization of ethylene with indicated comonomers is accomplished in multistage process in presence of catalyst. Process is first carried out in first reaction zone comprising at least one suspension reactor to produce first polymerization product, which is then conveyed to second reaction zone comprising at least one gas-phase reactor, wherein polymerization of ethylene with indicated comonomers proceeds in presence of indicated first polymerization product at temperature by at least 10°C exceeding temperature in suspension reactor. Propylene random copolymer obtained by above-described method as well as products made from this polymer are also described.

EFFECT: achieved preparation of copolymer with controlled monomer distribution enabling various applications such as expansion molding, injection molding, and manufacture of fibers and tubes.

29 cl, 7 dwg, 3 tbl