Abstract: Elastomeric pellets are described, comprising: (A) EP(D)M elastomeric polymer having a content of bound propylene of at least 30% by weight, preferably from 31% to 40% by weight; (B) polyethylene the weight ratio between the two components (A)/(B) ranging from 80/20 to 95/5, preferably from 85/15 to 88/12. Their preparation is also described, together with their use as components of impact-resistant compositions.

Abstract: Polyolefinic compositions endowed with a high impact strength, comprising:(a) 35-45% by weight of a C.sub.2 /C.sub.3 copolymer containing from 4 to 10% by weight of C.sub.2 and exhibiting a melt flow rate (M.F.R.) from 10 to 20 g/10 minutes at 230.degree. C. and 2.16 kg;(b) 35-45% by weight of a C.sub.2 /C.sub.3 copolymer containing from 4 to 10% by weight of C.sub.2 and exhibiting a M.F.R. from 35 to 45 g/10 minutes at 230.degree. C. and 2.16 kg;(c) 10-30% by weight of a C.sub.2 /C.sub.3 /(diene) elastomer containing from 40 to 55% by weight of C.sub.3 and from 0 to 5% by weight of a diene monomer, which is amorphous to X-rays and is characterized by:.alpha..sub.2 +.alpha..sub.4 higher than 16%R.sub.1 .times.R.sub.2 lower than 0.5M.W.D. lower than 3Mooney viscosity (ML 1+4, 100.degree. C.) from 30 to 38.vertline..eta..vertline. from 1.5 to 2 dl/g, measured in tetrahydronaphthalene at 135.degree. .

Abstract: Moisture-resistant packing cardboard of the corrugated type is prepared from flat paper sheets formed from 10% to 90% by weight of cellulose fibers and from 90% to 10% by weight of fibrils of at least one thermoplastic polymer and having a surface area greater than 1.0 m.sup.2 /gm, by heating the sheets under pressure on an undulated surface and coupling the resulting corrugated or undulated sheets with one or more flat sheets to which the corrugated sheet is adhered through the tips of the corrugations or undulations.

Abstract: Composite sheets comprising a layer of cellulosic fibers and a layer adjacent thereto consisting in whole or in part of thermoplastic fibers are made to adhere by superimposing the sheets on the side of the cellulosic fibers layer and by inserting between such layers a film of a thermoplastic polymer having:(a) a melting temperature lower than the melting temperature of the polymer forming the thermoplastic synthetic fibres contained in the layer adjacent to the cellulosic layer, intended for the adhesion, of the composite sheet;(b) a viscosity in the molten state--measured in a capillary viscosimeter, at a velocity gradient equal to or lower than 10.sup.-1 seconds, and at a temperature comprised between a temperature higher by 10.degree. C. than the melting temperature of such polymer and a temperature higher by 20.degree. C. than the melting temperature of the abovesaid thermoplastic fibres--lower than 1.multidot.10.sup.8 poises, and preferably lower than 1.multidot.10.sup.