Catalytic systems for the polimerisation and copolimerisation of alpha-olefins

Catalyst component for the polymerization of alpha-olefins in solution, in suspension, in gas phase at low and high pressure and temperature or in mass at high pressures and high or low temperatures, characterised in that is defined by general formulas I or II

• 3
• wherein:
• R, equal to or different from each other, is hydrogen or a radical which contains from 1 to 20 carbon atoms;
• this group optionally contains heteroatoms of groups 14 to 16 of the periodic table of the elements and boron;
• at least one group R contains a group OSiR″3, wherein R″ is selected from the group comprising:
• C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 alkenyl, C7-C20 arylalkyl, C7-C20 arylalkenyl or alkylaryl, linear or branched,
• Q is selected from a group comprising:
• boron or an element from groups 14 or 16 of the periodic table, when m>1, groups Q are equal to or different from each other;
• the free valences of every Q are filled with groups R according to the value of c index;
• two groups R optionally are united to form a ring from 5 to 8 atoms;
• in value range from 1 to 4;
• L, equal to or different from each other, is a cyclic or game group united to M through a π bond, it contains a cyclopentadienyl ring, that optionally is fused with one or more other rings, or it is an atom from groups 15 or 16 of the periodic table;
• L1 and L2, equal to or different from each other, have the same meaning of L;
• M is a metal from groups 3, 4, 10 of the periodic table, lauthanide or actinide.
• X, equal to or different from each other, is selected from a group comprising:
• halogen, hydrogen, OR′″, N(R′″)2, C1-C20 alkyl or C6-C20 aryl;
• wherein R′″ is selected from the group comprising:
• C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 alkenyl, C7-C20 arylalkyl, C7-C20 arylalkenyl or alkylaryl, linear or branched;
• x is 1 or 2, y is 2 or 3 in such a way that x 1 y 4
• d ranges from 0 to 2;
• a, b and c are integers from 0 to 10, in such a way that a+b+c>1.