A process for preparing non-extruded stabilized olefin polymers

Details A process for preparing non-extruded stabilized olefin polymers A process for preparing non-extruded stabilized olefin polymers

C - Chemistry, Metallurgy

08

K

117/47.3

C08K 5/00 (2006.01) C08J 3/20 (2006.01) C08J 7/00 (2006.01) C08L 23/02 (2006.01)

Patent

CA 2022506

Disclosed is a process for preparing nonextruded stabilized olefin particles. The process includes the step of polymerizing an olefin monomer or olefin monomers in the presence of a Ziegler-Natta catalyst, thus obtaining olefin polymer particles having a spheroidal shape, and the step of depositing a stabilizer mixture on the polymer particles. The stabilizer mixture is a molten mixture or a mixture in which at least the stabilizer (A) is in the liquid state, without containing any solvent, and comprising the following stabilizers (percent by weight with respect to the weight of the polymer particles): (A) from 0.020 to 0.15% of one or more organic phosphates or phosphonites or mixtures thereof which are liquid at room temperature or have a melting point below 100° C;. (B) from 0.025% to 0.2% of one or more phenolic antioxidants with melting points from 45° to 130° C; and, optionally, one or more of the following additional components: (C) from 0.05% to 0.5% of one or more thioethers or organic polysulfides or mixtures thereof; (D) from 0.10 to 1.0% of one or more light stabilizers which are liquid at room temperature or have a melting point below 150° C, selected from the group consisting of hindered amine light stabilizers, benzophenone and benzotriazole derivatives; (E) one or more diluents selected from the group consisting of paraffins and cycloparaffins which are liquid at room temperature or have a melting point below 110° C, epoxidized soy bean or linseed oil, silicone oils and olefin oligomers, in an amount not greater than 0.3%.

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