公开(公告)号：US12275809B2

公开(公告)日：2025-04-15

申请号：US18487175

申请日：2023-10-16

Applicant: Chevron Phillips Chemical Company LP

Inventor： Jeremy M. Praetorius ,  Yongwoo Inn ,  Alfred E. Brown, Jr. ,  Brandy Rutledge-Ryal ,  Carlos A. Cruz ,  Jay M. Chaffin

IPC: C08F210/16 ,  C08F4/6592 ,  C08F210/02 ,  C08L23/0807

Abstract: Ethylene-based polymers having a density of 0.952 to 0.968 g/cm3, a ratio of HLMI/MI from 185 to 550, an IB parameter from 1.46 to 1.80, a tan δ at 0.1 sec−1 from 1.05 to 1.75 degrees, and a slope of a plot of viscosity versus shear rate at 100 sec−1 from 0.18 to 0.28 are described, with low melt flow versions having a HLMI from 10 to 30 g/10 min and a Mw from 250,000 to 450,000 g/mol, and high melt flow versions having a HLMI from 30 to 55 g/10 min and a Mw from 200,000 to 300,000 g/mol. These polymers have the processability of chromium-based resins, but with improved stress crack resistance and topload strength for bottles and other blow molded products.

公开(公告)号：US20230192914A1

公开(公告)日：2023-06-22

申请号：US17552451

申请日：2021-12-16

Applicant: Chevron Phillips Chemical Company LP

Inventor： Max P. McDaniel ,  Graham R. Lief ,  Qing Yang ,  Carlos A. Cruz ,  Yongwoo Inn ,  Jared Barr

IPC: C08F10/02 ,  C08F10/14 ,  C07F17/00

CPC classification number: C08F10/02 ,  C08F10/14 ,  C07F17/00

Abstract: Methods for controlling the long chain branch content of ethylene homopolymers and copolymers produced in a polymerization process include the steps of contacting a metallocene compound, an organoaluminum compound, a high LCB activator-support, and a low LCB activator-support to form a catalyst composition, contacting the catalyst composition with ethylene and an optional olefin comonomer in a polymerization reactor system under polymerization conditions to produce an ethylene polymer having a LCB content, and controlling the relative amount of the high LCB activator-support and the low LCB activator-support in the catalyst composition to adjust the LCB content of the ethylene polymer.

公开(公告)号：US11634567B2

公开(公告)日：2023-04-25

申请号：US17841803

申请日：2022-06-16

Applicant: Chevron Phillips Chemical Company LP

Inventor： Jeremy M. Praetorius ,  Chung Ching Tso ,  Ashish M. Sukhadia ,  Yongwoo Inn ,  Qing Yang ,  John T. Blagg

IPC: C08L23/06 ,  B29C48/00 ,  B29C48/08 ,  C08J5/18 ,  C08L23/08 ,  B29L7/00

Abstract: Disclosed are ethylene polymer compositions containing a homogeneously-branched first ethylene polymer component and 15-35 wt. % of 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 ratio of Mw/Mn from 2 to 5, a melt index less than 2 g/10 min, and a CY-a parameter at 190° C. from 0.35 to 0.7. 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. Further, methods for improving film Elmendorf tear strength also are described.

公开(公告)号：US11584816B2

公开(公告)日：2023-02-21

申请号：US17547341

申请日：2021-12-10

Applicant: Chevron Phillips Chemical Company LP

Inventor： Vivek Rohatgi ,  Ashish M. Sukhadia ,  Yongwoo Inn ,  Elizabeth M. Lanier

IPC: C08F210/16 ,  C08F10/02 ,  C08L23/08 ,  C08K5/14 ,  C08F8/00 ,  C08F210/02 ,  C08L23/06 ,  F16L9/12

Abstract: Disclosed herein are ethylene-based polymers generally characterized by a density of at least 0.94 g/cm3, a high load melt index from 4 to 20 g/10 min, a zero-shear viscosity at 190° C. from 20,000 to 400,000 kPa-sec, and a relaxation time at 190° C. from 225 to 3000 sec. These ethylene polymers can be produced by peroxide-treating a broad molecular weight distribution Ziegler-catalyzed resin, and can be used in large diameter, thick wall pipes and other end-use applications.

公开(公告)号：US11427703B2

公开(公告)日：2022-08-30

申请号：US16363221

申请日：2019-03-25

Applicant: Chevron Phillips Chemical Company LP

Inventor： Jeremy M. Praetorius ,  Chung Ching Tso ,  Ashish M. Sukhadia ,  Yongwoo Inn ,  Qing Yang ,  John T. Blagg

IPC: C08L23/06 ,  C08L23/08 ,  C08J5/18 ,  B29C48/00 ,  B29C48/08 ,  B29L7/00

Abstract: Disclosed are ethylene polymer compositions containing a homogeneously-branched first ethylene polymer component and 15-35 wt. % of 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 ratio of Mw/Mn from 2 to 5, a melt index less than 2 g/10 min, and a CY-a parameter at 190° C. from 0.35 to 0.7. 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. Further, methods for improving film Elmendorf tear strength also are described.

公开(公告)号：US20220127395A1

公开(公告)日：2022-04-28

申请号：US17571665

申请日：2022-01-10

Applicant: Chevron Phillips Chemical Company LP

Inventor： Jeremy M. Praetorius ,  Alfred E. Brown, Jr. ,  Yongwoo Inn ,  Youlu Yu ,  Qing Yang ,  Ashish M. Sukhadia

IPC: C08F210/16 ,  B29C49/00 ,  C08F4/6592

Abstract: Ethylene-based polymers are characterized by a melt index less than 1 g/10 min, a density from 0.94 to 0.965 g/cm3, a Mw from 100,000 to 250,000 g/mol, a relaxation time from 0.5 to 3 sec, and an average number of long chain branches (LCBs) per 1,000,000 total carbon atoms in a molecular weight range of 300,000 to 900,000 g/mol that is greater than that in a molecular weight range of 1,000,000 to 2,000,000 g/mol, or an average number of LCBs per 1,000,000 total carbon atoms in a molecular weight range of 1,000,000 to 2,000,000 g/mol of less than or equal to about 5 and a maximum ratio of ηE/3η at an extensional rate of 0.1 sec−1 from 1.2 to 10. These polymers have substantially no long chain branching in the high molecular weight fraction of the polymer, but instead have significant long chain branching in a lower molecular weight fraction, such that polymer melt strength and parison stability are maintained for the fabrication of blow molded products and other articles of manufacture. These ethylene polymers can be produced using a dual catalyst system containing a single or two atom bridged metallocene compound with two indenyl groups, and a single atom bridged metallocene compound with a fluorenyl group and a cyclopentadienyl group.

公开(公告)号：US20210388130A1

公开(公告)日：2021-12-16

申请号：US16898502

申请日：2020-06-11

Applicant: Chevron Phillips Chemical Company LP

Inventor： Jeremy M. Praetorius ,  Alfred E. Brown, JR. ,  Yongwoo Inn ,  Youlu Yu ,  Qing Yang ,  Ashish M. Sukhadia

IPC: C08F210/16 ,  B29C49/00 ,  C08F4/6592

Abstract: Ethylene-based polymers are characterized by a melt index less than 1 g/10 min, a density from 0.94 to 0.965 g/cm3, a Mw from 100,000 to 250,000 g/mol, a relaxation time from 0.5 to 3 sec, and an average number of long chain branches (LCBs) per 1,000,000 total carbon atoms in a molecular weight range of 300,000 to 900,000 g/mol that is greater than that in a molecular weight range of 1,000,000 to 2,000,000 g/mol, or an average number of LCBs per 1,000,000 total carbon atoms in a molecular weight range of 1,000,000 to 2,000,000 g/mol of less than or equal to about 5 and a maximum ratio of ηE/3η at an extensional rate of 0.1 sec−1 from 1.2 to 10. These polymers have substantially no long chain branching in the high molecular weight fraction of the polymer, but instead have significant long chain branching in a lower molecular weight fraction, such that polymer melt strength and parison stability are maintained for the fabrication of blow molded products and other articles of manufacture. These ethylene polymers can be produced using a dual catalyst system containing a single or two atom bridged metallocene compound with two indenyl groups, and a single atom bridged metallocene compound with a fluorenyl group and a cyclopentadienyl group.

公开(公告)号：US11098139B2

公开(公告)日：2021-08-24

申请号：US15908033

申请日：2018-02-28

Applicant: Chevron Phillips Chemical Company LP

Inventor： Youlu Yu ,  Paul J. DesLauriers ,  Yongwoo Inn

IPC: C08F10/02 ,  B01J19/00 ,  B01J19/24

Abstract: A method of determining multimodal polyethylene quality comprising the steps of (a) providing a multimodal polyethylene resin sample; (b) determining, in any sequence, the following: that the multimodal polyethylene resin sample has a melt index within 30% of a target melt index; that the multimodal polyethylene resin sample has a density within 2.5% of a target density; that the multimodal polyethylene resin sample has a dynamic viscosity deviation (% MVD) from a target dynamic viscosity of less than about 100%; that the multimodal polyethylene resin sample has a weight average molecular weight (Mw) deviation (% MwD) from a target Mw of less than about 20%; and that the multimodal polyethylene resin sample has a gel permeation chromatography (GPC) curve profile deviation (% GPCD) from a target GPC curve profile of less than about 15%; and (c) responsive to step (b), designating the multimodal polyethylene resin sample as a high quality resin.

公开(公告)号：US20210054178A1

公开(公告)日：2021-02-25

申请号：US16543686

申请日：2019-08-19

Applicant: Chevron Phillips Chemical Company LP

Inventor： Chung Ching Tso ,  Errun Ding ,  Randall S. Muninger ,  John T. Blagg ,  Yongwoo Inn ,  Max P. McDaniel ,  Ashish M. Sukhadia ,  Sarah Eppinger

IPC: C08L23/06 ,  C08F210/16 ,  C08F4/6592

Abstract: Ethylene polymers having a density from 0.908 to 0.925 g/cm3, a melt index from 0.5 to 3 g/10 min, a ratio of Mw/Mn from 2 to 4, a ratio of Mz/Mw from 1.6 to 2.3, a CY-a parameter from 0.45 to 0.6, and an ATREF profile characterized by a single peak at a peak ATREF temperature from 76 to 88° C., and by less than 4.5 wt. % of the polymer eluting above a temperature of 91° C. These ethylene polymers can be used to produce various articles of manufacture, such as blown and cast films with a beneficial combination of high tear resistance and low haze.

公开(公告)号：US20210024728A1

公开(公告)日：2021-01-28

申请号：US16522788

申请日：2019-07-26

Applicant: Chevron Phillips Chemical Company LP

Inventor： Carlos A. Cruz ,  Yongwoo Inn ,  Justin Lumbley ,  Brandy Rutledge-Ryal ,  John R. Rathman ,  Jennifer L. Hicks ,  Jay M. Chaffin

IPC: C08L23/08 ,  C08F210/16 ,  C08F4/6592 ,  C08K3/08

Abstract: Ethylene-based polymers having a density of 0.952 to 0.965 g/cm3, a high load melt index (HLMI) from 5 to 25 g/10 min, a weight-average molecular weight from 275,000 to 450,000 g/mol, a number-average molecular weight from 15,000 to 40,000 g/mol, a viscosity at HLMI from 1400 to 4000 Pa-sec, and a tangent delta at 0.1 sec−1 from 0.65 to 0.98 degrees. These polymers have the processability of chromium-based resins, but with improved stress crack resistance, and can be used in large-part blow molding applications.