Thermoplastic molding compositions comprising a thermoplastic polyester, a poly(ε-caprolactone), a biodegradable polyester differing from the poly(ε-caprolactone), a phosphinic salt and a polar modified polyolefin wax prepared by means of metallocene catalysts, the use of the thermoplastic molding compositions for the production of flame-retardant moldings of any type, to the resultant moldings, and to the use of the polar modified polyolefin wax prepared by means of metallocene catalysts for an improvement of the flame retardancy of thermoplastic molding compositions comprising a thermoplastic polyester.

Thermoplastic molding compositions comprising a thermoplastic polyester, a poly(ε-caprolactone), a biodegradable polyester differing from the poly(ε-caprolactone), a phosphinic salt and a polar modified polyolefin wax prepared by means of metallocene catalysts, the use of the thermoplastic molding compositions for the production of flame-retardant moldings of any type, to the resultant moldings, and to the use of the polar modified polyolefin wax prepared by means of metallocene catalysts for an improvement of the flame retardancy of thermoplastic molding compositions comprising a thermoplastic polyester.

The present invention relates to a process for preparation of a catalyst for polymerization of olefins. The catalyst has a particle size of between 5 to 30 microns with activity ranging from 3-4 Kg (co)polymer per g of catalyst and excellent hydrogen response. The method for preparation of the catalyst comprises the steps of: a) contacting a liquid magnesium complex, an electron donor, and a titanium halide compound to form a solution; b) obtaining the solid uniform catalyst particles by precipitation; and c) washing the catalyst particles to obtain solid uniform catalyst., for producing (co)polymer of ethylene with other olefins have fines less than 10 wt.%.

The present invention relates to a process for preparation of a catalyst for polymerization of olefins. The catalyst has a particle size of between 5 to 30 microns with activity ranging from 3-4 Kg (co)polymer per g of catalyst and excellent hydrogen response. The method for preparation of the catalyst comprises the steps of: a) contacting a liquid magnesium complex, an electron donor, and a titanium halide compound to form a solution; b) obtaining the solid uniform catalyst particles by precipitation; and c) washing the catalyst particles to obtain solid uniform catalyst., for producing (co)polymer of ethylene with other olefins have fines less than 10 wt.%.

The present invention relates to a process for preparation of a catalyst for polymerization of olefins. The catalyst has a particle size of between 5 to 30 microns with activity ranging from 3-4 Kg (co)polymer per g of catalyst and excellent hydrogen response. The method for preparation of the catalyst comprises the steps of: a) contacting a liquid magnesium complex, an electron donor, and a titanium halide compound to form a solution; b) obtaining the solid uniform catalyst particles by precipitation; and c) washing the catalyst particles to obtain solid uniform catalyst., for producing (co)polymer of ethylene with other olefins have fines less than 10 wt.%.

A processing aid for foam molding comprising a copolymer obtained by the polymerization of from 50% to 100% by weight total of one or more monomers selected from the group consisting of ethyl methacrylate and propyl methacrylate, and 0 to 50% by weight of other copolymerizable monomers, the copolymer having the following properties: (a) a reduced viscosity measured according to ASTM D2857 at 1 mg/mL in chloroform at 25° C. of greater than 8 dL/g and (b) a Tg equal to or less than 77° C. is provided.

A processing aid for foam molding comprising a copolymer obtained by the polymerization of from 50% to 100% by weight total of one or more monomers selected from the group consisting of ethyl methacrylate and propyl methacrylate, and 0 to 50% by weight of other copolymerizable monomers, the copolymer having the following properties: (a) a reduced viscosity measured according to ASTM D2857 at 1 mg/mL in chloroform at 25° C. of greater than 8 dL/g and (b) a Tg equal to or less than 77° C. is provided.

A supported metallocene catalyst can include a silica-based carrier and an aluminum alkyl halide, a cocatalyst compound, and a metallocene compound supported in the silica-based carrier. The aluminum alkyl halide is supported at higher rate on the surface of the silica-based carrier than inside the pores, and the cocatalyst compound is supported at higher rate inside the pores of the silica-based carrier than on the surface of the silica-based carrier. Such a supported metallocene catalyst can be prepared by: (i) supporting an aluminum alkyl halide in a silica-based carrier; (ii) supporting a cocatalyst compound in the silica-based carrier in which the aluminum alkyl halide is supported; and (iii) supporting a metallocene compound in the carrier in which the aluminum alkyl halide and the cocatalyst compound are supported. Such a supported metallocene catalyst can be used to polymerize polyolefins with excellent activity and polyolefin with a uniform powder morphology.

A supported metallocene catalyst can include a silica-based carrier and an aluminum alkyl halide, a cocatalyst compound, and a metallocene compound supported in the silica-based carrier. The aluminum alkyl halide is supported at higher rate on the surface of the silica-based carrier than inside the pores, and the cocatalyst compound is supported at higher rate inside the pores of the silica-based carrier than on the surface of the silica-based carrier. Such a supported metallocene catalyst can be prepared by: (i) supporting an aluminum alkyl halide in a silica-based carrier; (ii) supporting a cocatalyst compound in the silica-based carrier in which the aluminum alkyl halide is supported; and (iii) supporting a metallocene compound in the carrier in which the aluminum alkyl halide and the cocatalyst compound are supported. Such a supported metallocene catalyst can be used to polymerize polyolefins with excellent activity and polyolefin with a uniform powder morphology.

The ultrahigh-molecular-weight polyethylene powder of the present invention is an ultrahigh-molecular-weight polyethylene powder having a viscosity-average molecular weight Mv of 10×10.sup.4 or higher and 1000×10.sup.4 or lower, wherein viscosity-average molecular weight Mv(A) of a kneaded product obtained by kneading under specific kneading conditions, and the Mv satisfy the following relationship: “{Mv−Mv(A)}/Mv is 0.20 or less”, and the ultrahigh-molecular-weight polyethylene powder contains an ultrahigh-molecular-weight polyethylene powder having a particle size of 212 μm or larger, wherein the powder having a particle size of 212 μm or larger has an average pore volume of 0.6 ml/g or larger and an average pore size of 0.3 μm or larger.