| 摘要 |
FIELD: chemistry. ^ SUBSTANCE: invention relates to method of polymerisation and regulation of rheological characteristics of polymeric compositions. Method includes introduction of polymer with high molecular weight into polymer with low molecular weight. Polymeric compositions are obtained by polymerisation of monomers in gas-phase polymerisation reactor with the use of bimetal catalytic composition and at least one regulating agent. Regulating agent such as alcohol, simple ether, oxygen or amin, is added or removed in amount necessary to regulate the level of introduction of polymer with high molecular weight, level of polymer with low molecular weight or both of them. Polymerisation takes place in pseudoliquefied layer with fluidising medium, which includes alkan, selected from group including C4-C20 alkans. With increase of alkan content in reactor, amount of regulating agent is increased for supporting polymeric composition at target value of flow-behaviour index I21. ^ EFFECT: improvement of regulation of rheological characteristics. ^ 20 cl, 2 dwg, 2 tbl, 5 ex |
