METHOD OF OBTAINING SHOCK-RESISTANT PROPYLENE POLYMER COMPOSITIONS
FIELD: chemistry.SUBSTANCE: invention relates to a method of polymerisation for obtaining a polypropylene polymer composition. The method is performed in the presence of a system of catalysts, containing (a) solid catalytic component, which has an average size of particles from 15 to 80 mcm, contain...
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Zusammenfassung: | FIELD: chemistry.SUBSTANCE: invention relates to a method of polymerisation for obtaining a polypropylene polymer composition. The method is performed in the presence of a system of catalysts, containing (a) solid catalytic component, which has an average size of particles from 15 to 80 mcm, containing magnesium halogenide, titanium compound, possessing, at least, a bond Ti-halogen, and, at least, two electron-donor compounds, one of which is present in an amount from 50 to 90 wt % relative to the total quantity of donors, one of which is selected from succinates, and the second is selected from 1,3-diethers, (b) alkylaluminium and, optionally, (c) internal electron-donor compound. The method includes contact of the catalytic components (a), (b) and, optionally, (c), then, preliminary polymerisation to a degree of pre-polymerisation from 0.1 to 1000 g per gram of the solid catalytic component (a), then polypropylene polymerisation with obtaining a propylene (co)polymer, at least, 85 wt % of which are not soluble in xylene at 25°C, and the following stage, carried out in a gas phase, polymerisation of the mixture of ethylene with ?-olefins CH=CHR, where R is a hydrocarbon radical, containing 1-10 carbon atoms, with obtaining an ethylene copolymer.EFFECT: obtaining shock-resistant polypropylene compositions with the application of the catalytic system, capable of suggesting simultaneously high polymerisation activity, good morphologic stability, optimal inclusion of the xylene-soluble phase, high isotacticity, such that the final composition has a good balance between shock-resistance and rigidity.13 cl, 1 tbl, 5 ex
Изобретение относится к способу полимеризации для получения композиции пропиленового полимера. Способ проводят в присутствии системы катализаторов, содержащей (a) твердый каталитический компонент, имеющий средний размер частиц от 15 до 80 мкм, содержащий галогенид магния, соединение титана, имеющее, по крайней мере, связь Ti-галоген, и, по крайней мере, два электронодонорных соединения, одно из которых присутствует в количестве от 50 до 90% мол. по отношению к общему количеству доноров, одно из которых выбирают из сукцинатов, и второе выбирают из простых 1,3 диэфиров, (b) алкилалюминий и, необязательно, (c) внутреннее электронодонорное соединение. Способ включает контакт каталитических компонентов (a), (b) и, необязательно, (c), затем предварительную полимеризацию до степени предполимеризации от 0,1 до 1000 г на грамм твердого каталитического ком |
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