US 10,435,527 B2Granted

Dual component LLDPE copolymers with improved impact and tear resistance

AssigneeChevron Phillips Chemical Company LP

InventorsJeremy M. Praetorius, Chung C. Tso, Qing Yang, Yongwoo Inn, John T. Blagg, Ashish M. Sukhadia

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Abstract

Disclosed are ethylene polymer compositions containing a homogeneously-branched first ethylene polymer component and a homogeneously-branched second ethylene polymer component of higher density than the first ethylene polymer component. The ethylene polymer composition can be characterized by a density from 0.912 to 0.925 g/cm3, a melt index less than 3.5 g/10 min, and a CY-a parameter at 190° C. from 0.25 to 0.65. These polymer compositions have the excellent dart impact strength and optical properties of a metallocene-catalyzed LLDPE, but with improved machine direction tear resistance, and can be used in blown film and other end-use applications.

Claims20

Dependent claims

A film comprising an ethylene polymer composition, the composition comprising:

(i) a homogeneously-branched first ethylene polymer component;
and
(ii) a homogeneously-branched second ethylene polymer component of higher density than the first ethylene polymer component;
wherein the amount of the second ethylene polymer component is in a range from about 4 to about 50 wt. %, based on the total weight of the first ethylene polymer component and the second ethylene polymer component;
and
wherein the composition is characterized by:
a density in a range from about 0.912 to about 0.925 g/cm3;
a ratio of Mw/Mn in a range from about 1.8 to about 4.5;
a melt index less than or equal to about 3.5 g/10 min;
a CY-a parameter in a range from about 0.25 to about 0.65;
and
an ATREF curve containing at least two peaks, with a first peak at a temperature in a range from about 67 to about 82° C., and a second peak at a temperature in a range from about 92 to about 105° C.

9 more elements

An ethylene polymer composition comprising:

(i) a homogeneously-branched first ethylene polymer component;
and
(ii) a homogeneously-branched second ethylene polymer component of higher density than the first ethylene polymer component;
wherein the amount of the second ethylene polymer component is in a range from about 4 to about 50 wt. %, based on the total weight of the first ethylene polymer component and the second ethylene polymer component;
and
wherein the composition is characterized by:
a density in a range from about 0.912 to about 0.925 g/cm3;
a ratio of Mw/Mn in a range from about 1.8 to about 4.5;
a melt index less than or equal to about 3.5 g/10 min;
a CY-a parameter in a range from about 0.25 to about 0.65;
and
an ATREF curve containing at least two peaks, with a first peak at a temperature in a range from about 67 to about 82° C., and a second peak at a temperature in a range from about 92 to about 105° C.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/715,215Filed 26 Sep 2017
Published: US 2019/0092912 A128 Mar 2019
Granted: 8 Oct 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

C08J 5/18
Manufacture of articles or shaped materials containing macromolecular substances: manufacture of films or sheets
C08F 210/16
Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond: copolymers of ethene with alpha-alkenes, e.g. EP…
C08L 23/0815
With unsaturated hydrocarbons only containing four or more carbon atoms: with aliphatic 1-olefins containing one carbon-to-carbon double bond
C08J 2323/06
Homopolymers or copolymers of ethene: polyethene