Versalis S.p.a.

Daniele Balducci

Paolo Mariani

Andrea Castiglioni

Francesco Scavello

A polymer composition comprising: (a) from 50% by volume to 99% by volume, preferably from 70% by volume to 95% by volume, of at least one homopolymer or copolymer of ethylene; (b) from 1% by volume to 50% by volume, preferably from 5% by volume to 30% by volume, of at least two fillers having different thermal conductivity; (c) from 100 ppm to 4000 ppm, preferably from 200 ppm to 3500 ppm of at least one fluoropolymer; the sum of (a)+(b) being 100. Said polymer composition can be used as a phase change material (PCM), in particular for thermal energy storage (TES), more in particular for the storage of solar energy.

Polymer composition and its use as a phase change material

Polyethylene powder comprising at least one additive having: Melt Flow Index (MFI), measured at 190&#xb0; C. with a load of 2.16 kg in accordance with standard ISO 1133-1:2011, ranging from 0.1 g/10 minutes to 100 g/10 minutes, preferably ranging from 5 g/10 minutes to 35 g/10 minutes; density ranging from 0.890 g/cmto 0.965 g/cm, preferably ranging from 0.940 g/cmto 960 g/cm; bulk density ranging from 0.35 g/cmto 0.60 g/cm, preferably ranging from 0.40 g/cmto 0.50 g/cm; average particle diameter (d) ranging from 400 &#x3bc;m to 800 &#x3bc;m, preferably ranging from 450 &#x3bc;m to 780 &#x3bc;m. Said polyethylene powder comprising at least one additive can be advantageously used in rotomolding.

Polyethylene powder, process for its preparation and its use for rotomolding

Crosslinkable composition comprising: (a) from 80% by weight to 98% by weight, preferably from 85% by weight to 95% by weight, of at least one high density polyethylene (HDPE); (b) from 2% by weight to 20% by weight, preferably from 5% by weight to 15% by weight, of at least one linear low density polyethylene (LLDPE); (c) from 0.2 parts by weight to 1.5 parts by weight, preferably from 0.5 parts by weight to 0.8 parts by weight, with respect to 100 parts by weight of (a)+(b), of at least one crosslinking agent selected from organic peroxides; (d) from 0.2 parts by weight to 2.5 parts by weight, preferably from 0.5 parts by weight to 1.0 parts by weight, with respect to 100 parts by weight of (a)+(b), of at least one co-crosslinking agent selected from allyl compounds. Said crosslinkable composition can advantageously be used in rotational molding ('rotomolding').

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San Giorgio di Mantova, Italy

Daniele Balducci