US 11,680,160 B2Granted

Polyolefin resin composition and production method of same

AssigneeDL Chemical CO., LTD.

InventorsJang Woo Lee, Byung Keel Sohn, Sah Mun Hong, Da Jung Kim, Hee Jun Lee, Sung Ho Choi, Su Hyun Park

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Abstract

Disclosed are a polyolefin resin composition and a production method using same. The polyolefin resin satisfies the following conditions: (1) melt index (MI2.16, 190° C., under a load of 2.16 kg) is 0.1 to 1.5 g/10 min; (2) density is 0.91 to 0.93 g/cc; (3) polydispersity Index (Mw (weight-average molecular weight)/Mn (number-average molecular weight)) is 3 to 7; (4) Mz (Z-average molecular weight)/Mw (weight-average molecular weight) is 2.3 to 4.5; and (5) COI(Comonomer Orthogonal Index) value calculated by Equation 1 in the specification is 5 to 12. In Equation 1, “SCB number at Mz” represents average number of branches derived from comonomers per 1000 carbon atoms at Z-average molecular weight (Mz), and “SCB number at Mn” represents average number of branches derived from comonomers per 1000 carbon atoms at number-average molecular weight (Mn) based on a molecular weight-comonomer distribution graph.

Claims9

Dependent claims

A polyolefin resin satisfying following properties (1) to (6):

(1) melt index (MI2.16, 190° C., under a load of 2.16 kg) is 0.1 to 1.5 g/10 min;
(2) density is 0.91 to 0.93 g/cc;
(3) polydispersity Indexe (weight-average molecular weight/number-average molecular weight (Mw/Mn)) is 3 to 7;
Z-average molecular weight/weight average molecular weight (Mz/Mw) is 2.3 to 4.5;
(5) Comonomer Orthogonal Index (COI) value calculated by the following Equation 1 is 5 to 12;
and
(6) when a temperature rising elution fractionation (TREF) curve of multimodal distribution is deconvoluted, an area of the TREF curve having a peak at 60 to 70° C. is 40 to 65% of a total area of the TREF curve of multimodal distribution,
Comonomer
⁢
⁢
Orthogonal
⁢
⁢
Index
⁢
⁢
(
COI
)
=
SCB
⁢
⁢
number
⁢
⁢
at
⁢
⁢
⁢
Mz
-
SCB
⁢
⁢
number
⁢
⁢
at
⁢
⁢
Mn
log
⁢
⁢
Mz
-
log
⁢
⁢
Mn
[
Equation
⁢
⁢
1
]
in Equation 1, “SCB” represents an average number of short chain branches, “SCB number at Mz” represents average number of short chain branches derived from comonomers per 1000 carbon atoms at Z-average molecular weight (Mz), and “SCB number at Mn” represents average number of short chain branches derived from comonomers per 1000 carbon atoms at number-average molecular weight (Mn) when a molecular weight-comonomer distribution graph was prepared in which log value (log Mw) of molecular weight (Mw) is marked in x-axis of the graph and the amount of polymer (dw_dlog Mw) corresponding to the log value (log Mw) and average number of short chain branches (SCB) derived from comonomer (number of branches per 1,000 carbon atoms, unit:
number/1,000 C) corresponding to the log value (log Mw) are marked in y-axis of the graph, and wherein melt flow rate ratio (MFRR;
MI21.6/MI2.16, the MI21.6 is a melt index measured at 190° C. and 21.6 kg load condition) is 17 to 40.

57 more elements

A method for preparing a polyolefin resin, comprising the steps of:

polymerizing a first polymer having high density and high melt index (MI) by introducing a metallocene supported catalyst, ethylene and alpha-olefin to a first reactor of two or more serially connected reactors selected from the group consisting of a slurry polymerization reactor and a gas phase polymerization reactor;
and
polymerizing polyolefin resin by transferring the first polymer to a second reactor of the two or more serially connected reactors,
wherein the polyolefin resin satisfies the following physical properties:
(1) melt index (MI2.16, 190° C., under a load of 2.16 kg) is 0.1 to 1.5 g/10 min;
(2) density is 0.91 to 0.93 g/cc;
(3) polydispersity Index (weight average molecular weight)/(number average molecular weight (Mw/Mn)) is 3 to 7;
(4) Z-average molecular weight/weight-average molecular weight (Mz/Mw) is 2.3 to 4.5;
(5) comonomer orthogonal index (COI) value calculated by the following Equation 1 is 5 to 12;
and (6) when a temperature rising elution fractionation (TREF) curve of multimodal distribution is deconvoluted, an area of the TREF curve having a peak at 60 to 70° C. is 40 to 65% of a total area of the TREF curve of multimodal distributio,
Comonomer
⁢
⁢
Orthogonal
⁢
⁢
Index
⁢
⁢
(
COI
)
=
SCB
⁢
⁢
number
⁢
⁢
at
⁢
⁢
⁢
Mz
-
SCB
⁢
⁢
number
⁢
⁢
at
⁢
⁢
Mn
log
⁢
⁢
Mz
-
log
⁢
⁢
Mn
[
Equation
⁢
⁢
1
]
in Equation 1, “SCB” represents an average number of short chain branches, “SCB number at Mz” represents average number of short chain branches derived from comonomers per 1000 carbon atoms at Z-average molecular weight (Mz), and “SCB number at Mn” represents average number of short chain branches derived from comonomers per 1000 carbon atoms at number-average molecular weight (Mn) when a molecular weight-comonomer distribution graph was prepared in which log value (log Mw) of molecular weight (Mw) is marked in x-axis of the graph and the amount of polymer (dw_dlog Mw) corresponding to the log value (log Mw) and average number of short chain branches (SCB) derived from comonomer (number of branches per 1,000 carbon atoms, unit:
number/1,000 C) corresponding to the log value (log Mw) are marked in y-axis of the graph, and wherein melt flow rate ratio (MFRR;
MI21.6/MI2.16, the MI21.6 is a melt index measured at 190° C. and 21.6 kg load condition) is 17 to 40.

60 more elements

A method for preparing a polyolefin resin, comprising the steps of:

introducing a metallocene supported catalyst, ethylene and alpha-olefin into a reactor selected from the group consisting of a slurry polymerization reactor and a gas phase polymerization reactor, and then performing a polymerization process, to prepare a first polymer having a melt index (MI) of 4 to 15 and a density of 0.925 to 0.940 g/cc;
introducing a metallocene supported catalyst, ethylene and alpha-olefin into another reactor selected from the group consisting of a slurry polymerization reactor and a gas phase polymerization reactor, and then performing a polymerization process, to prepare a second polymer having MI of 0.1 to 0.5 and a density of 0.900 to 0.915 g/cc;
and
melt-blending the first polymer and second polymer component to prepare the polyolefin resin,
wherein the polyolefin resin satisfies the following physical properties:
(1) melt index (MI2.16, 190° C., under a load of 2.16 kg) is 0.1 to 1.5 g/10 min;
(2) density is 0.91 to 0.93 g/cc;
(3) polydispersity Index (weight average molecular weight)/(number average molecular weight (Mw/Mn)) is 3 to 7;
(4) Z-average molecular weight/weight-average molecular weight (Mz/Mw) is 2.3 to 4.5;
(5) comonomer orthogonal index (COI) value calculated by the following Equation 1 is 5 to 12;
and (6) when a temperature rising elution fractionation (TREF) curve of multimodal distribution is deconvoluted, an area of the TREF curve having a peak at 60 to 70° C. is 40 to 65% of a total area of the TREF curve of multimodal distribution,
Comonomer
⁢
⁢
Orthogonal
⁢
⁢
Index
⁢
⁢
(
COI
)
=
SCB
⁢
⁢
number
⁢
⁢
at
⁢
⁢
⁢
Mz
-
SCB
⁢
⁢
number
⁢
⁢
at
⁢
⁢
Mn
log
⁢
⁢
Mz
-
log
⁢
⁢
Mn
[
Equation
⁢
⁢
1
]
in Equation 1, “SCB” represents an average number of short chain branches, “SCB number at Mz” represents average number of short chain branches derived from comonomers per 1000 carbon atoms at Z-average molecular weight (Mz), and “SCB number at Mn” represents average number of short chain branches derived from comonomers per 1000 carbon atoms at number-average molecular weight (Mn) when a molecular weight-comonomer distribution graph was prepared in which log value (log Mw) of molecular weight (Mw) is marked in x-axis of the graph and the amount of polymer (dw_dlog Mw) corresponding to the log value (log Mw) and average number of short chain branches (SCB) derived from comonomer (number of branches per 1,000 carbon atoms, unit:
number/1,000 C) corresponding to the log value (log Mw) are marked in y-axis of the graph, wherein melt flow rate ratio (MFRR;
MI21.6/M12.16, the MI21.6 is a melt index measured at 190° C. and 21.6 kg load condition) is 17 to 40.

61 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/044,505Filed 2 Apr 2019
Priority: KR 10-2018-00398625 Apr 2018
Published: US 2021/0115236 A122 Apr 2021
Granted: 20 Jun 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification17 codes

C08L 23/20
Homopolymers or copolymers of hydrocarbons having four or more carbon atoms: having four to nine carbon atoms
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…
C08J 5/18
Manufacture of articles or shaped materials containing macromolecular substances: manufacture of films or sheets
C08L 23/0815
With unsaturated hydrocarbons only containing four or more carbon atoms: with aliphatic 1-olefins containing one carbon-to-carbon double bond