-
公开(公告)号：US10221254B2
公开(公告)日：2019-03-05
申请号：US15564456
申请日：2016-04-06
发明人： Brandon C. Locklear , R. Eric Pequeno , Richard B. Pannell , Fathi David Hussein , Rich John Stolz , William A. Matthews
IPC分类号： C08F2/34 , C08F2/38 , C08F10/00 , C08F4/6592 , C08F110/02 , B01J8/18 , C08F4/659
摘要： A method for transitioning a gas phase polymerization reactor between metallocene catalysts is provided. The method comprises first reducing the superficial gas velocity and increasing the height of the fluidized bed within the reactor prior to stopping a feed comprising a first metallocene catalyst. The method further comprises introducing a first polymerization neutralizer to the reactor, wherein the first polymerization reactor does not comprise water, and then introducing a second polymerization neutralizer to the reactor, wherein the second polymerization neutralizer is different from the first polymerization neutralizer. After this, the method comprises purging the reactor with an inert gas and then introducing a feed comprising a second metallocene catalyst to the reactor.
-
公开(公告)号：US10682797B2
公开(公告)日：2020-06-16
申请号：US15545384
申请日：2016-01-20
IPC分类号： B29C48/69 , B29C48/25 , B29C48/04 , B29C48/08 , B29C48/37 , B29C48/92 , B29C48/255 , B29C48/70 , B29C48/10 , B29K23/00 , C08L23/06
摘要： Methods for extrusion of polyolefins (112) that control specific energy input to the extruder (102) for gel reduction. Disclosed herein is an example method for forming plastic products (120, 208) with reduced gels, comprising: melting a polyolefin resin (112) in extruder (102) to form a melt; adjusting specific energy input in the extruder (102) to reduce gels in the melt; and forming the melt into a polyolefin product (120, 208). Disclosed herein is also an example method for forming plastic products (120, 20) with reduced gels, comprising: melting a polyolefin resin in extruder (102) to form a melt; selecting a throttle valve (104) position for gel reduction; setting the throttle valve (104) at the selected throttle valve (104) position to restrict flow of the melt out of the extruder (102); and forming the melt into a polyolefin product (120, 208).
-
公开(公告)号：US11518825B2
公开(公告)日：2022-12-06
申请号：US17040166
申请日：2019-03-04
发明人： Wesley R. Mariott , John F. Szul , Haiqing Peng , James M. Farley , Bruce J. Savatsky , Brandon C. Locklear
摘要： Embodiments of the present disclosure are directed towards catalyst formulations including a metallocene and a stearic compound selected from bis 2-hydroxyethyl stearyl amine, aluminum distearate, and combinations thereof, where the metallocene is represented by the following formula: (Formula (I)) wherein each n-PR is n-propyl, and each X is independently CH3, Cl, or F.
-
公开(公告)号：US10995161B2
公开(公告)日：2021-05-04
申请号：US16620102
申请日：2018-06-06
IPC分类号： C08F10/02 , C08F2/24 , C08F4/6592
摘要： The present disclosure provides a method of maintaining a target value of a melt flow index of a polyethylene polymer product being synthesized with a metallocene catalyst in a fluidized bed gas phase reactor. The method includes producing the polyethylene polymer product at the target value of the melt flow index with a metallocene catalyst in a fluidized bed gas phase reactor at a steady state in which the fluidized bed gas phase reactor is at a first reactor temperature and receives feeds of hydrogen and ethylene at a hydrogen to ethylene feed ratio at a first ratio value. When a change in reactor temperature is detected, the hydrogen to ethylene feed ratio is changed from the first ratio value to a second ratio value so as to maintain the melt flow index value of the polyethylene polymer product at the target value.
-
公开(公告)号：US20190352440A1
公开(公告)日：2019-11-21
申请号：US16531453
申请日：2019-08-05
IPC分类号： C08F210/16 , C08L23/08
摘要： Methods for olefin polymerization are described. The methods include a) forming a first polyolefin under a first set of polymerization conditions in the presence of a first catalyst composition and a first concentration of at least a first continuity additive composition, the first polyolefin composition having a target density, ρ1, and a target Flow Index, FI1; and b) forming a second polyolefin composition under a second set of polymerization conditions in the presence of a second catalyst composition and a second concentration of a second continuity additive composition, the second polyolefin composition having a target density, ρ2, and a target Flow Index, FI2; wherein the process is essentially free of providing a polymerization neutralizing composition between steps a) and b).
-
公开(公告)号：US11117991B2
公开(公告)日：2021-09-14
申请号：US16531453
申请日：2019-08-05
IPC分类号： C08F2/00 , C08F4/659 , C08F4/6592 , C08F210/16 , C08L23/08
摘要： Methods for olefin polymerization are described. The methods include a) forming a first polyolefin under a first set of polymerization conditions in the presence of a first catalyst composition and a first concentration of at least a first continuity additive composition, the first polyolefin composition having a target density, ρ1, and a target Flow Index, FI1; and b) forming a second polyolefin composition under a second set of polymerization conditions in the presence of a second catalyst composition and a second concentration of a second continuity additive composition, the second polyolefin composition having a target density, ρ2, and a target Flow Index, FI2; wherein the process is essentially free of providing a polymerization neutralizing composition between steps a) and b).
-
公开(公告)号：US10471641B2
公开(公告)日：2019-11-12
申请号：US15545401
申请日：2016-01-20
发明人： Daudi A. Abe , Brandon C. Locklear
IPC分类号： C08F8/50 , C08F110/02 , C08F110/06 , B29C48/92 , B29C48/04 , B29C48/08 , B29C48/10 , B29C48/25 , B29C48/693 , B29C48/70 , B29C48/255 , B29C48/69 , B29K23/00 , B29C48/37
摘要： Methods for extrusion of polyolefins (110) that utilize melt temperature to control molecular weight and also reduce gels. Disclosed herein is an example method for controlling polymer chain scission in an extrusion system (100), comprising: melting a polyolefin resin (110) in extruder (102) at a first melt temperature to form a first melt (112); passing the first melt (112) through a screen pack (106); forming the first melt 112) into a first polyolefin product (116, 118); melting additional polyolefin resin (110) of the same grade in the extruder (102) at a second melt temperature to form a second melt (112), wherein the second melt temperature differs from the first melt temperature by 5° C. or more to control chain scission in the extruder (102); passing the second melt (112) through the screen pack (106); and forming the second melt (112) into a second polyolefin product (116, 118).
-
公开(公告)号：US10400049B2
公开(公告)日：2019-09-03
申请号：US15568912
申请日：2016-04-22
IPC分类号： C08F210/16 , C08F4/653 , C08F4/6592 , C08L23/08 , C08F4/659
摘要： Methods for olefin polymerization are described. The methods include a) forming a first polyolefin under a first set of polymerization conditions in the presence of a first catalyst composition and a first concentration of at least a first continuity additive composition, the first polyolefin composition having a target density, 1, and a target Flow Index, FI1; and b) forming a second polyolefin composition under a second set of polymerization conditions in the presence of a second catalyst composition and a second concentration of a second continuity additive composition, the second polyolefin composition having a target density, 2, and a target Flow Index, FI2; wherein the process is essentially free of providing a polymerization neutralizing composition between steps a) and b).
-
公开(公告)号：US20180001533A1
公开(公告)日：2018-01-04
申请号：US15545384
申请日：2016-01-20
发明人： Daudi A. Abe , Brandon C. Locklear , Yuet Meng Chu , T.R. Veariel
摘要： Methods for extrusion of polyolefins (112 ) that control specific energy input to the extruder (102 ) for gel reduction. Disclosed herein is an example method for forming plastic products (120, 208 ) with reduced gels, comprising: melting a polyolefin resin (112 ) in extruder (102 ) to form a melt; adjusting specific energy input in the extruder (102 ) to reduce gels in the melt; and forming the melt into a polyolefin product (120, 208 ). Disclosed herein is also an example method for forming plastic products (120, 20 ) with reduced gels, comprising: melting a polyolefin resin in extruder (102 ) to form a melt; selecting a throttle valve (104 ) position for gel reduction; setting the throttle valve (104 ) at the selected throttle valve (104 ) position to restrict flow of the melt out of the extruder (102 ); and forming the melt into a polyolefin product (120, 208 ).
-
10.发明申请公开(公告)号：US20170355791A1
公开(公告)日：2017-12-14
申请号：US15527997
申请日：2015-11-24
发明人： Bruce J. Savatsky , Brandon C. Locklear , R. Eric Pequeno , Abarajith S. Hari , David M. Glowczwski
IPC分类号： C08F110/02 , B01J8/00 , B01J8/18 , B01J8/24
CPC分类号： C08F110/02 , B01J8/003 , B01J8/0055 , B01J8/006 , B01J8/1809 , B01J8/1827 , B01J8/1836 , B01J8/24 , B01J2208/00053 , B01J2208/00061 , B01J2208/00274 , B01J2208/00557 , B01J2208/00628 , B01J2208/00637 , B01J2208/00982 , B01J2208/00991 , B01J2219/002 , B01J2219/00213 , B01J2219/00238 , C08F2/34 , C08F2500/12 , C08F10/00
摘要： Polyolefin polymerization performed by contacting in a reactor an olefin monomer and optionally a comonomer with a catalyst system in the presence of induced condensing agents (ICA) and optionally hydrogen. The ICA may include two or more ICA components where the composition of the ICA (i.e., the concentration of each ICA component) may affect the polyolefin production rate. Changes to the relative concentration of the two or more ICA components may be according to ICA equivalency factors that allow for increasing the polyolefin production rate while maintain a sticking temperature, increasing polyolefin production rate while increasing the dew point approach temperature of the ICA, or a combination thereof.
-
-
-
-
-
-
-
-
-
搜索结果
14 条记录 (耗时 0.016 秒)
