Random propylene-ethylene copolymers

Patent metadata

Field	Value
Publication number	US-10155827-B2
Application number	US-201515309138-A
Country	US
Kind code	B2
Filing date	Apr 28, 2015
Priority date	May 6, 2014
Publication date	Dec 18, 2018
Grant date	Dec 18, 2018

Abstract

The present disclosure relates to a propylene ethylene copolymer comprising:
an ethylene content of between 1.8 and 10.0% by weight; a molecular weight distribution (MWD), expressed in terms of Mw/Mn, greater than 4.0; a content of xylene soluble fraction (XS) and ethylene content (C2) that fulfills the following relationship:

XS<(C2×2.1)−2.4

where:
XS=% by weight of the fraction soluble in xylene at 25° C.; and C2=% by weight of ethylene units in the copolymer as determined via NMR.

First claim

What is claimed is:

1. A propylene/ethylene copolymer comprising:
an ethylene content of between 2.1 and 7.1% by weight;
a molecular weight distribution (MWD), expressed in terms of Mw/Mn, of greater than 4.0;
a content of xylene soluble fraction (XS) and ethylene content (C2) that fulfills the following relationship:
XS<(C2×2.1)−2.4

where:
XS=% by weight of the fraction soluble in xylene at 25° C.; and
C2=% by weight of ethylene units in the copolymer as determined via NMR,
wherein propylene/ethylene copolymer has a melt flow rate (MFR, 230° C., 2.16 kg) from 0.5 to 75 g/10 min.

2. The propylene/ethylene copolymer of claim 1 , wherein the ethylene content is between 2.7 and 6.3 wt %.

3. The propylene/ethylene copolymer of claim 1 , wherein the melt flow rate (MFR, 230° C. 2.16 kg) of the propylene/ethylene copolymer is from 2.0 to 25.0 g/10 min.

4. The propylene/ethylene copolymer of claim 1 , wherein the content of the xylene soluble fraction (XS) and the ethylene content (C2) fulfill the following relationship:
XS<(C2×2.1)−2.6

where:
XS=% by weight of the fraction soluble in xylene at 25° C.; and
C2=% by weight of ethylene units in the copolymer as determined via NMR.

5. A cast film comprising the propylene/ethylene copolymer of claim 1 .

Assignees

• Basell Poliolefine Italia Srl

Inventors

• Massari Paola
• Piemontesi Fabrizio
• Vitale Gianni
• Cathelin Caroline
• Morini Giampiero
• Ciarafoni Marco
• Cavalieri Claudio
• Caputo Tiziana

Classifications

• C08F2800/20

  as weight or mass percentages · CPC title

• C08F210/06 Primary

  Propene · CPC title

• C08F10/00

  Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond · CPC title

• C08F210/02

  Ethene · CPC title

• C08J2323/14

  Copolymers of propene (C08J2323/16 takes precedence) · CPC title