Abstract: A melt-blown web contains melt-blown fibers obtained by a) melt-mixing a propylene-based polymer, a first peroxide and a second peroxide at temperatures between 180° C. and 240° C., preferably between 200° C. and 220° C., wherein the first peroxide has a half-life time of 1 hour at a first temperature T1/2 1 and the second peroxide has a half-life time of 1 hour at a second temperature T1/2 2, wherein T1/2 2 is higher than T1/2 1 and b) processing the composition obtained by step a) by a melt-blown process at temperatures between 240° C. and 300° C., preferably between 245° C. and 280° C., to provide the melt-blown fibers.

Abstract: The process includes: A) feeding the propylene-based polymer to the first inlet and discharging the first melt composition from the first outlet, wherein the first screw is operated at a first screw speed and B) feeding the first melt composition to the second inlet and feeding the further component to the side inlet and discharging the second melt composition from the second outlet, wherein the second screw is operated at a second screw speed smaller than the first screw speed.

Abstract: A compounding extruder includes a melting section having a first cylindrical tube having a first inlet to receive a propylene polymer and a first outlet to discharge a first melt composition and a first screw arranged in the first cylindrical tube and having a first length, a first outer screw diameter Do1 and a first inner screw diameter to convey the propylene polymer and to the first outlet and a mixing section comprising a second cylindrical tube having a second inlet to receive, the first melt composition from the first outlet, an end having a second outlet and a side inlet between the second inlet and the second outlet to receive a further component, and a second screw arranged in the second cylindrical to convey the first melt composition and the further component to the second outlet, wherein Do1 is 0.82 to 1.2×Do2.

Abstract: A process for producing a polypropylene composition using a compounding extruder includes a) a melting section having a first elongated cylindrical tube with a first inlet port to receive a propylene-based polymer and additives containing an elastomer of ethylene and ?-olefin comonomer having 4 to 8 carbon atoms and a first outlet port to discharge a first melt composition containing a melt of the propylene-based polymer and the additives and a first screw arranged in the first elongated cylindrical tube, convey the propylene-based polymer and the additives to the first outlet port, and a mixing section including a second elongated cylindrical tube having a second inlet port to receive the first melt composition, and a second outlet port to discharge a second melt composition containing the first melt composition and the optional further component and a second screw arranged in the second elongated cylindrical tube to convey the first melt composition to the second outlet, wherein the first screw and the seco

Abstract: The invention relates to a process for producing a polypropylene composition using a first extruder comprising successive zones comprising a first zone, a second zone, a third zone and a fourth zone and a second extruder comprising successive zones comprising a first zone and a second zone, the process comprising the steps of: 1a) introducing a first propylene-based polymer in the first zone of the first extruder, 1b) melt mixing the first propylene-based polymer in the second zone of the first extruder, 1c) adding an additive masterbatch to the mixture of step 1b) in the third zone of the first extruder and 1d) melt-mixing the mixture of step 1c) in the fourth zone of the first extruder to obtain the polypropylene composition, wherein the maximum temperature in the fourth zone of the first extruder is lower than the maximum temperature in the second zone of the first extruder and is lower than 240° C.

Abstract: The invention relates to a composition comprising a) a propylene homopolymer and/or a propylene copolymer consisting of at least 70.0 wt % of propylene monomer units and at most 30.0 wt % of comonomer units selected from ethylene monomer units and ?-olefin monomer units having 4 to 10 carbon atoms, b) an optional ethylene-?-olefin copolymer, c) glass fibers and d) a reaction product of d1) a functionalized polypropylene and d2) a polyetheramine, wherein the total amount of a) and b) is 10.0 to 80.0 wt % or 20.0 to 80.0 wt % with respect to the total composition, the amount of c) is 5.0 to 50.0 wt % with respect to the total composition, the amount of d2) is at least 5.0 wt % with respect to the total composition and the weight ratio of d2) to d1) is at least 0.050.

Abstract: The invention relates to a process for producing a blend of a thermoplastic starch and a polyolefin using a first extruder comprising successive zones comprising a first zone, a second zone, a third zone and a fourth zone and a second extruder comprising successive zones comprising a first zone, a second zone, a third zone and a fourth zone, the process comprising the steps of: 1 a) introducing a polyolefin and a compatibilizer in the first zone of the first extruder, 1 b) melt mixing the polyolefin and the compatibilizer in the second zone of the first extruder, 1 c) adding a thermoplastic starch to the mixture of step 1 b) in the third zone of the first extruder and 1 d) melt-mixing the mixture of step 1 c) in the fourth zone of the first extruder to obtain the blend, wherein the thermoplastic starch is produced in the second extruder by a process comprising the steps of: 2a) introducing starch in the first zone of the second extruder, 2b) adding a plasticiser to the mixture of step 2a) in the second zone o

Abstract: The present invention relates to a process for making a thermoplastic composition, comprising the steps of: a) melt mixing a first thermoplastic polymer and a paper product comprising a mixture of cellulose fibers and a second thermoplastic polymer.

Abstract: The present invention relates to a process for making a thermoplastic composition, comprising the steps of: a) melt mixing a first thermoplastic polymer and a paper product comprising a mixture of cellulose fibers and a second thermoplastic polymer.