Soft polyolefin compositions with improved flow

Details Soft polyolefin compositions with improved flow Soft polyolefin compositions with improved flow

2007-11-13

2007-11-13

Zemel, Irina (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S216000, C525S232000, C525S240000

Reexamination Certificate

active

10507250

ABSTRACT:
A polyolefin composition suitable for preparing films and sheets, comprising:(A) from 15 to 40% by weight of a crystalline copolymer of propylene with at least one alpha-olefin of formula H2C═CHR1, where R1is H or a C2-8linear or branched alkyl, containing at least 90% by weight of propylene, having solubility in xylene at room temperature lower than 15% by weight;(B) from 60 to 85% by weight of an elastomeric fraction comprising:(1) a copolymer of propylene with ethylene, optionally containing 0.5 to 5% by weight of a diene, containing from 20 to 35% by weight ethylene, and having solubility in xylene at room temperature greater than 45% by weight, the intrinsic viscosity of the xylene soluble fraction ranging from 1.0 to 3.0 dl/g; and(2) a copolymer of ethylene with at least one alpha-olefin of formula H2C═CHR2, where R2is a C2-8linear or branched alkyl, optionally containing 0.5 to 5% by weight of a diene, containing 15% to 40% by weight alpha-olefin, and having solubility in xylene at room temperature greater than 35% by weight, the intrinsic viscosity of the xylene soluble fraction ranging from 1.0 to 3.0 dl/g;the (1)/(2) weight ratio ranging from 1:5 to 5:1.The polyolefin composition of the invention, preferably prepared by sequential polymerization in at least three stages, has a flexural modulus lower than 130 MPa, Shore D hardness lower than 40, and MFR≧1.5 g/10 min.

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