Abstract: The present invention relates to a cross-linked polyolefin composition reinforced with a filler with improved stiffness, impact strength, pressure resistance and impact/stiffness balance as well as to the use of such a polyolefin composition for the preparation of pipes. The polyolefin composition comprises a base resin comprising a cross-linkable olefin homo- or copolymer (A) and a filler (B), wherein the polyolefin composition has been subjected to cross-linking conditions, e.g. silane-cross-linking or peroxide cross-linking.

Abstract: The present invention relates to a polyethylene composition comprising a polyethylene base resin, which comprises a. an ethylene copolymer as fraction (A), and b. an ethylene homo- or copolymer as fraction (B), with fraction (A) having a lower molecular weight than fraction (B), wherein the polyethylene base resin is obtainable in a polymerisation process in which a single-site catalyst. (SSC) is used in the polymerisation of at least one of fractions (A) and (B), and the base resin has (i) a density of below 940 kg/m3, and (ii) a MFR2 at 190 ° C./2.16 kg of 0.001 to 10 g/10 min, and the composition has (iii) a flexural modulus of from 300 to 820 MPa, and to a process for the production of such a composition, and to a pipe produced from such a composition.

Abstract: The present invention deals with polymer compositions suitable for making pipes. The compositions comprise a multimodal copolymer of ethylene and one or more alpha-olefins having from 4 to 10 carbon atoms wherein the multimodal ethylene copolymer has a density of from 924 to 935 kg/m3, a melt index MFR5 of from 0.5 to 6.0 g/10 min, a melt index MFR2 of from 0.1 to 2.0 g/10 min and a shear thinning index SHI27/210 of from 2 to 50.

Abstract: The present invention relates to a polyethylene composition comprising a base resin which comprises (a) an ethylene homo- or copolymer fraction (A); and (b) an ethylene homo- or copolymer fraction (B), wherein (i) fraction (A) has a lower average molecular weight than fraction (B); (ii) the base resin has a density of 940 to 947 kg/m3; (iii) the polyethylene composition has an MFR5 of 0.1 to 0.5 g/10 min; and (iv) the polyethylene composition has an SHI(2.7/210) of 10 to 49. Furthermore, the present invention relates to an article, preferably a pipe comprising said composition and to the use of said composition for the production of an article, preferably a pipe.

Abstract: The present invention relates to a polyethylene composition comprising a polyethylene base resin, which comprises a. an ethylene copolymer as fraction (A), and b. an ethylene homo- or copolymer as fraction (B), with fraction (A) having a lower molecular weight than fraction (B), wherein the polyethylene base resin is obtainable in a polymerisation process in which a single-site catalyst. (SSC) is used in the polymerisation of at least one of fractions (A) and (B), and the base resin has (i) a density of below 940 kg/m3, and (ii) a MFR2 at 190 ° C./2.16 kg of 0.001 to 10 g/10 min, and the composition has (iii) a flexural modulus of from 300 to 820 MPa, and to a process for the production of such a composition, and to a pipe produced from such a composition.

Abstract: The present invention relates to a pipe made of a polyethylene composition comprising a polyethylene base resin, which comprises c. an ethylene copolymer as fraction (A), and d. an ethylene homo- or copolymer as fraction (B), with fraction (A) having a lower molecular weight than fraction (B), wherein the polyethylene base resin is obtainable in a polymerisation process in which a single-site catalyst (SSC) is used in the polymerisation of at least one of fractions (A) and (B), the base resin having (i) a density of below 940 kg/m, and (ii) a MFR5 at 190° C./5.00 kg of at least 0.20 g/10 min, and the polyethylene composition having a time to failure of at least 250 h measured according to ISO 1167 at 95° C. and 4.3 MPa.

Abstract: The present invention relates to a method for cross-linking a polymer article which comprises a cross-linkable polymer with hydrolyzable silane groups and a crystallinity level of at least 30%. The cross-linking is performed in the presence of a silanol condensation catalyst comprising a compound of formula (I): ArSO3H or a precursor thereof, Ar being a hydrocarbyl substituted aromatic group comprising at least 14 carbon atoms.

Abstract: A multimodal polymer composition for pipes is disclosed. The polymer is a multimodal polyethylene with a density of 0.930-0.965 g/cm3, an MFR5 of 0.2-1.2 g/10 min, an Mn of 8000-15000, an Mw of 180-330×103, and an Mw/Mn of 20-35, said multimodal polyethylene comprising a low molecular weight (LMW) ethylene homopolymer fraction and a high molecular weight (HMW) ethylene copolymer fraction, said HMW fraction having a lower molecular weight limit of 3500, and a weight ratio of the LMW fraction to the HMW fraction of (35-55):(65:45).

Abstract: A master batch for the production of cross-linked polymer pipes is described. The master batch comprises carbon black and a polymer carrier consisting of a Ziegler-Natta catalyzed polyethylene with a density of at least 0.940 g/cm3. A cross-linkable polymer composition comprising the master batch and a chromium catalyzed polyethylene base polymer, and a cross-linked polyethylene pipe made by cross-linking the cross-linkable polymer composition are also described.