Borealis Polymers Oy

Neste Oy

Ulf Palmqvist

Eero Iiskola

Bill Gustafsson

Arja Kostiainen

Hilkka Knuuttila

Pekka Sormunen

Tarja Korvenoja

Hilkka R Knuuttila

Pekka J Sormunen

Ruth Dammert

Hans-Bertil Martinsson

Eeva-Leena Heino

A multimodal polymer composition for fiber optical cables and a fiber optical cable comprising the composition are disclosed. The composition is characterized in that it comprises a multimodal polyethylene with a density of 0.920-0.965 g/cm,and a viscosity at a shear stress of 2.7 kPa (&eegr;,) of at least 150 kPa.s, said multimodal polyethylene comprising a low molecular weight (LMW) ethylene homo- or copolymer fraction and a high molecular weight (HMW) ethylene copolymer fraction, said multimodal polymer composition having a weight ratio of the LMW fraction to the HMW fraction of (35-55):(65-45). Preferably, the multimodal polyethylene is a bimodal polyethylene and has a shear thinning index (SHI), defined as the ratio of the viscosities at shear stresses of 2.7 and 210 kPa, respectively, of SHI,&equals;20-150. Also, preferably, the multimodal polyethylene has a MFR,of 0.1-2.0 g/10 min and a melt strength at 190&deg; C. of at least 4 g. The multimodal polymer composition is particularly useful as a material for slotted core elements of fiber optical cables of the slotted core type.

Multimodal polymer composition

Growing community of inventors

Espoo, Finland

Tarja Korvenoja