Patent ID: 7829645

Claim:
Process for the preparation of a polymer comprising monomeric units of ethylene, an α-olefin and a vinyl norbornene, applying as a catalyst system: a. a group 4 metal containing catalyst having a single cyclopentadienyl ligand and a mono substituted nitrogen ligand, wherein said catalyst is defined by the formula I: wherein Y is selected from the group consisting of: ai) a phosphorus substituent defined by the formula: wherein each R 1 is independently selected from the group consisting of a hydrogen atom, a halogen atom, C 1-20 hydrocarbyl radicals which are unsubstituted by a halogen atom C 1-20 hydrocarbyl radicals which are further substituted by a halogen atom, a C 1-8 alkoxy radical, a C 6-10 aryl radical a C 6-10 aryloxy radical, an amido radical, and a silyl radical of the formula: —Si—(R 2 ) 3 Form. III. wherein each R 2 is independently selected from the group consisting of hydrogen, a C 1-8 alkyl radical, a C 1-8 alkoxy radical, C 6-10 aryl radicals, C 6-10 aryloxy radicals, and a germanyl radical of the formula: —Ge—(R 2 ) 3 Form. IV. wherein R 2 ′ is independently selected from the group consisting of hydrogen, a C 1-8 alkyl radical, a C 1-8 alkoxy radical, C 6-10 aryl radicals and, C 6-10 aryloxy radicals, aii) a substituent defined by the formula: wherein each of U is CR 3 R 3 , C═CR 3 R 3 , C═NR 3 , SiR 3 R 3 , C═O, NR 3 , P R 3 , O or S, Z is -A=A, and each A is CR 3 , N or P, each R 3 is independently selected from the group consisting of hydrogen, hydrocarbyl radical, silyl radical according to form. III and germanyl radical according to form. IV, k, m and n have independently the value 0, 1, 2 or 3, provided that k+m+n>0 and aiii) a substituent defined by the formula: wherein each of Sub 1 and Sub 2 is independently selected from the group consisting of hydrocarbyls having from 1 to 20 carbon atoms, silyl groups, amido groups and phosphido groups; Cp is a ligand selected from the group consisting of cyclopentadienyl, substituted cyclopentadienyl, indenyl, substituted indenyl, fluorenyl and substituted fluorenyl; X is an activatable ligand and n is 1 or 2, depending upon the valence of M and the valence of X; and M is a group 4 metal selected from the group consisting of titanium, hafnium and zirconium, and b. an aluminoxane activating compound, to produce said polymer with the following properties: [VNB]>0.01 and Δδ>30−15*[VNB], provided that Δδ is not negative, [VNB] is the content of vinyl norbornene in the polymer in weight % and Δδ is, expressed in degrees, the difference between the phase angle δ at an angular frequency of 0.1 rad/s and the phase angle δ at an angular frequency of 100 rad/s, as measured by dynamic mechanical spectroscopy, at a temperature of 125° C.