POLYOLEFINIC COMPOSITIONS ENDOWED WITH A HIGH IMPACT STREGTH

摘要

Polyolefinic compositions endowed with a high impact stregth, comprising: a) 35-45% by weight of a C2/C3 copolymer containing from 4 to 10% by weight of C2 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 C2/C3 copolymer containing from 4 to 10% by weight of C2 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 C2/C3/(diene) elastomer containing from 40 to 55% by weight of C3 and from 0 to 5% by weight of a diene monomer, which is amorphous to X-rays and is characterized by : - .alpha. 2 + .alpha. 4 higher than 16% - R1 x R2 lower than 0.5 - M.W.D. lower than 3 - Mooney viscosity (ML 1 + 4, 100.degree.C) from 30 to 38 - ? from 1.5 to 2 dl/g, measured in tetrahydronaph thalene at 135.degree.C.