Patent ID: 8461406

Claim:
A process for producing an oligomeric product by the oligomerisation of at least one olefinic compound to be oligomerised, the at least one olefinic compound being in the form of an olefin or a compound including a carbon to carbon double bond, the process including: A) providing an activated oligomerisation catalyst comprising the combination of i) a source of Cr; ii) a ligating compound of the formula (R 1 ) m X 1 (Y)X 2 (R 2 ) n wherein: X 1 and X 2 are independently selected from the group consisting of N, P, As, Sb, Bi, O, S and Se; Y is a linking group between X 1 and X 2 ; m and n are independently 0, 1 or a larger integer; and R 1 and R 2 are independently hydrogen, a hydrocarbyl group or a heterohydrocarbyl group, and R 1 being the same or different when m>1, and R 2 being the same or different when n>1 ; iii) a metal containing activator, which is a compound selected from the group consisting of an alkylaluminoxane including methylaluminoxane (MAO), high stabilily methylaluminoxane (MAO HS), ethylaluminoxane (EAO), isobutylaluminoxane (iBuAO); and modified alkyialuminoxane including modified methylaluminoxane (MMAO); and iv) at least one olefinic compound in the form of an olefin or a compound including a carbon to carbon double bond; wherein components i) to iv), or one or more combinations thereof, have been combined in any suitable order to provide the activated oligomerisation catalyst; B) diluting the activated oligomerisation catalyst of A with an introduced liquid medium, that is a liquid medium that has not been formed in situ by the process for producing an oligomeric product; and C) contacting the at least one olefinic compound to be oligomerised with the diluted activated catalyst of B to produce an oligomeric product.