| 摘要 |
FIELD: chemistry. ^ SUBSTANCE: invention claims multistage method involving the following stages: stage a) propylene polymerisation, optionally with one or more monomers selected out of ethylene or alpha-olefins of formula CH2=CHT1, where T1 is C2-C10-alkyl radical, in the presence of catalytic system applied onto silicon dioxide and containing: i) one or more metallocene compounds of formula (I); ii) alumoxane or compound capable of alkylmetallocene cation formation; and optionally iii) organoaluminium compound; stage b) contact with one or more alpha-olefins of CH2=CHT formula in polymerisation conditions in propylene or ethylene gas phase, where T is hydrogen or C1-C10-alkyl radical, and optionally with non-conjugated diene in the presence of polymer obtained at stage a) and optionally in the presence of additional organoaluminium compound, provided that homopolymer formation does not occur; where polymer amount obtained at stage a) lies within 5 to 90 wt % of polymer weight obtained through the whole method, and polymer amount obtained at stage b) lies within 10 to 95 wt % of polymer weight obtained through the whole method. ^ EFFECT: enhanced flexibility in composition and property adjustment for end product. ^ 14 cl, 4 ex, 2 tbl |
