Abstract: Disclosed is a process for preparation of a propylene-based polymer composition involving the steps of: (a) mixing a propylene-based polymer and a peroxydicarbonate in a mixing device, wherein the mixing takes place at a temperature of ?30° C., wherein the peroxydicarbonate is introduced into the mixing process in a dry form; (b) keeping the mixed composition at a temperature of ?30° C.; (c) feeding the mixed composition into a melt extruder; (d) homogenizing the mixed composition at a temperature where the propylene-based polymer is in solid state during an average residence time of ?6.0 and ?30.0 seconds; (e) further homogenizing the mixed composition at a temperature at which the propylene-based polymer is in the molten state; and (f) extruding the homogenized material from a die outlet of the melt extruder followed by cooling and solidification; wherein the steps (a) through (f) are conducted in that order.

Abstract: The present invention relates to a use or process for the reduction of gels in polyethylene materials comprising at least one ethylene copolymer with a density ?850 kg/m3 and <905 kg/m3 wherein a polyethylene material is subjected to melt processing in the presence of a free radical initiator composition characterized in that the free radical initiator composition may for example be added in quantities ?0.050 wt. % compared to the total weight of the polyethylene material, wherein further the melt processing is performed in a melt processing unit, wherein the free radical initiator composition is dosed to the melt processing unit in a stage where the polyethylene material is in a molten condition and melt processing is conducted at a temperature of ?160° C. and ?240° C.

Abstract: The present invention relates to a use or process for the reduction of gels in polyethylene materials comprising at least one ethylene copolymer with a density ?850 kg/m3 and <905 kg/m3 wherein a polyethylene material is subjected to melt processing in the presence of a free radical initiator composition characterized in that the free radical initiator composition may for example be added in quantities ?0.050 wt. % compared to the total weight of the polyethylene material, wherein further the melt processing is performed in a melt processing unit, wherein the free radical initiator composition is dosed to the melt processing unit in a stage where the polyethylene material is in a molten condition and melt processing is conducted at a temperature of ?160° C. and ?240° C.

Abstract: Disclosed is a process for preparation of a propylene-based polymer composition involving the steps of: (a) mixing a propylene-based polymer and a peroxydicarbonate in a mixing device, wherein the mixing takes place at a temperature of ?30° C., wherein the peroxydicarbonate is introduced into the mixing process in a dry form; (b) keeping the mixed composition at a temperature of ?30° C.; (c) feeding the mixed composition into a melt extruder; (d) homogenizing the mixed composition at a temperature where the propylene-based polymer is in solid state during an average residence time of ?6.0 and ?30.0 seconds; (e) further homogenizing the mixed composition at a temperature at which the propylene-based polymer is in the molten state; and (f) extruding the homogenized material from a die outlet of the melt extruder followed by cooling and solidification; wherein the steps (a) through (f) are conducted in that order.

Abstract: The present invention relates to the use of a free radical initiator composition for the reduction of gels in polyethylene materials wherein a polyethylene material is subjected to melt processing in the presence of a free radical initiator composition characterized in that the free radical initiator composition is added in quantities ?0.050 wt % compared to the total weight of the polyethylene material. Such use results in polyethylene materials having reduced gel content, whilst still having good optical and mechanical properties, and whilst preferably maintaining melt properties such as melt mass flow rate.