POLYOLEFINIC COMPOSITIONS ENDOWED WITH A HIGH IMPACT STRENGTH

• Main Authors: FEDERICO MILANI, PAOLA MASSARI, DOMENICO LORI
• Format: Patent
• Language: English
• Published: 14.01.1993
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

Described are polyolefinic compositions endowed with a high impact strength, comprising: a) 35-45% by weight of an ethylene-propylene copolymer containing from 4 to 10% by weight of ethylene and exhibiting a melt flow rate of 10 to 20 g/10 minutes at 230 DEG C and 2.16 kg; b) 35-45% by weight of an ethylene-propylene copolymer containing from 4 to 10% by weight of ethylene and exhibiting a M.F.R. of 35 to 45 g/10 minutes at 230 DEG C and 2.16 kg; c) 10-30% by weight of an ethylene/propylene/ (diene) elastomer containing from 40 to 55% by weight of propylene and from 0 to 5% by weight of a diene monomer, which is amorphous under X-ray diffraction and is characterized by: - ( alpha 2 + alpha 4) higher than 16% - (R1 x R2) lower than 0.5 - Mw/Mn lower than 3 - Mooney viscosity (ML 1 + 4, 100 DEG C) from 30 to 38 - / eta / from 1.5 to 2 dl/g, measured in tetrahydronaphthalene at 135 DEG C. e