The invention relates to the use of at least one hydrogen peroxide in solid form to modify the rheology of a thermoplastic polymer when melted, specifically a polyolefin and particularly a polymer comprising at least one unit from propylene and, more particularly, polypropylene. The invention also relates to a method for modifying the rheology of a thermoplastic polymer when melted, specifically reducing viscosity when melted.

The invention relates to a polymer composition comprising a polyethylene and a crosslinking agent, wherein the polymer composition contains a total amount of vinyl groups which is B vinyl groups per 1000 carbon atoms, and B.sub.1≤B, wherein B.sub.1 is 0.88, when measured prior to crosslinking according to method ASTM D624898; and wherein the crosslinking agent is present in an amount which Z wt %, based on the total amount (100 wt %) of the polymer composition, and Z≤Z.sub.2, wherein Z.sub.2 is 0.60, an article being e.g. a cable, e.g. a power cable, and processes for producing a polymer composition and an article; useful in different end applications, such as wire and cable (W&C) applications.

A fiber-reinforced polymer composition that contains a polymer matrix and a plurality of long reinforcing fibers that are distributed within the polymer matrix is provided. The polymer matrix contains a propylene polymer and constitutes from about 30 wt. % to about 90 wt. % of the composition. The fibers constitute from about 10 wt. % to about 70 wt. % of the composition. Further, the polymer composition exhibits a spiral flow length of about 450 millimeters or more as determined in accordance with ASTM D3123-09 and a volatile organic content of about 100 micrograms per gram or less as determined by VDA 277.

The invention provides polypropylene impact copolymer compositions with reduced emissions of volatiles for the automotive industry, particularly for interior applications in the automotive industry.

A process for increasing MFR.sub.2 of a polyethylene copolymer or an ethylene plastomer or elastomer comprising: (I) extruding a copolymer of polyethylene copolymer having a density of 910 to 970 kg/m.sup.3 and an MFR.sub.2 of 1 and 100 g/10 min or an ethylene plastomer or elastomer having a density of 855 to 910 kg/m.sup.3 and an MFR.sub.2 of 0.5 and 100 g/10 min in the presence of 0.1 to 2 wt % of a non-peroxide radical initiator so as to produce a polyethylene copolymer having an MFR.sub.2 of 200 g/10 min or more, or an ethylene plastomer or elastomer having a MFR.sub.2 of 200 g/10 min or more.

The invention is related to a process for producing modified polyethylene having decreased melt flow rate (5 kg, 190 C.) (MFR). In particular, the present invention is directed to a process in a controlled manner for producing modified polyethylene recyclates having low MFR and low gel content directly by reactive extrusion processing.

An elastomer rheology process can include: receiving material formation data associated with an elastomer; conveying the elastomer towards one or more rollers that compress and stretch the elastomer according to a predetermined rolling profile comprising roller gap and speed settings; sensing a first dimension of a first portion of the elastomer before the first portion of the elastomer is passed through the sheeter; sensing a second dimension of a second portion of the elastomer after the second portion of the elastomer is passed through the sheeter; and calculating an elastomer property of the elastomer based on the controlled roller gap width, a measured roller force, the first dimension, and the second dimension.

Process for obtaining polyethylene with an MFI (190 C/2.16 kg) of at least 4 g/10 minutes and a melt strength (190 C.) of at least 8.0 cN, said process involving extrusion of low density polyethylene (LDPE) with an MFI of at least 5 g/10 minutes and a vinyl content of less than 0.25 terminal vinyl groups per 1000 C-atoms (measured with NMR in deuterated tetrachloroethane solution)in the presence of 500-5,000 ppm, based on the weight of low density polyethylene, of an organic peroxide.

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.

High quality melt-blown webs having improved barrier properties (3rd drop, cm H2O resp. mbar) and a widened process window. The melt-blown webs show a specific chain structure.