公开(公告)号：DE69709076T3

公开(公告)日：2007-02-15

申请号：DE69709076

申请日：1997-04-01

Applicant: DOW CHEMICAL CO

Inventor： KAO I ,  CAMP A ,  COMBS BRUCE ,  EVERSDYK A ,  JAIN PRADEEP ,  STULTZ H ,  WINTER A ,  DENTON P ,  WILSON D ,  WILSON R

IPC: B01J19/00 ,  C08F10/00 ,  B01J19/24 ,  C08F2/00 ,  C08F2/04 ,  C08F2/06 ,  C08F10/02 ,  C08F110/02 ,  C08F210/16

Abstract: A solution polymerization system for polymerizing an olefin monomer by reacting the monomer with catalyst and solvent has been invented. The system in one aspect includes a flow loop with a product polymer outlet, the flow loop forming a recycling reactor, a cataylst inlet on the flow loop through which catalyst and solvent flow into the flow loop, a monomer inlet on the flow loop through which monomer and solvent flow into the flow loop and, with the catalyst, form a reactant material stream, a first heat exchanger on the flow loop for receiving the reactant materials stream and any formed polymer and for removing heat of reaction or polymerization from the flow loop, and pump apparatus for pumping the reactant materials stream and formed polymer in the flow loop and from the first heat exchanger to the product polymer outlet. In one aspect, the system includes at least one additional heat exchanger on the flow loop for receiving the reactant materials stream and formed polymer and for removing heat of reaction or polymerization from the flow loop, the pump apparatus pumping formed polymer and remaining reactant materials to the product polymer outlet, and a portion of the formed polymer and remaining reactant materials flowing out from the product polymer outlet and the remainder recycling through the flow loop. In one aspect systems and methods according to the present invention are used to make polyethylene.

公开(公告)号：DE69823230T2

公开(公告)日：2004-08-19

申请号：DE69823230

申请日：1998-12-23

Applicant: DOW CHEMICAL CO

Inventor： TAU LI-MIN ,  SWINDOLL D ,  KAO CHE-I ,  JAIN PRADEEP

IPC: C08F2/04 ,  C08F6/00 ,  C08F6/10

Abstract: The polymer recovery capacity of solution polymerization units is increased by flashing a polymer solution exiting olefin polymerization reactors to produce a concentrated polymer solution having a reduced temperate and a solids content from 10 percent to 40 percent by weight. Flashing of the polymer solution preferably occurs at a temperature at least 20° C. higher than the crystallization temperature of the concentrated polymer solution The concentrated polymer solution can be prepared adiabatically and can be subsequently finished in conventional polymer recovery units without increasing the risk of gel formation.

公开(公告)号：CA2205116C

公开(公告)日：2003-07-29

申请号：CA2205116

申请日：1995-11-13

Applicant: DOW CHEMICAL CO

Inventor： MCKINNEY OSBORNE K ,  PARIKH DEEPAK R ,  BAKER SHARON L ,  KALE LAWRENCE T ,  KELLEY DAVID C ,  JAIN PRADEEP

IPC: C08L23/04 ,  B29C47/00 ,  B32B27/32 ,  C08F110/02 ,  C08F210/16 ,  C08J5/18 ,  C08L23/06 ,  C08L23/08 ,  B29C47/02

Abstract: An ethylene polymer extrusion composition having high drawdown and substantially reduced neck-in, a process for making such a composition and a process of using such a composition to prepare extrusion coatings, extrusion profiles and extrusion cast films are disclosed. The ethylene polymer extrusion composition is made of 75-95 weight percent of at least one ethyle ne .alpha.-olefin interpolymer and 5-25 weight percent of at least one high pressure ethylene polymer characterized as having high melt strength and a broad, bimodal molecular weight distribution. In profiles, coatings or films , the composition can be used as sealant, adhesive or abuse resistance layers.

公开(公告)号：DE69715818T2

公开(公告)日：2003-06-18

申请号：DE69715818

申请日：1997-01-22

Applicant: DOW CHEMICAL CO

Inventor： PARIKH R ,  CHUM S ,  JAIN PRADEEP ,  PATEL M ,  CLAYFIELD E ,  MCKEAND J ,  KUMMER G ,  KHAN AHMED ,  MARKOVICH P

IPC: C08L23/04 ,  C08L23/08 ,  C08L91/00 ,  C08L23/16

Abstract: Polymer mixtures are disclosed which comprise at least one homogeneously branched ethylene polymer (A) and at least one ethylene polymer (B) having a crystallinity which is at least 7% greater than the crystallinity of polymer (A) with certain provisos. A process for making a molded article using the disclosed polymer mixtures is disclosed as well as films, film layers, coatings and molded articles formed from those mixtures. These mixtures have several advantages over polymer compositions of the prior art, including improved properties at elevated temperatures such as improved softening point under load, improved hardness, improved toughness, improved 100% modulus of elasticity, improved compression set, improved ability to prevent oil bleed out at lower temperatures when the mixture contains oil and reduced injection molding cycle time. The mixtures retain their performance advantages even when substantial amounts of additives such as oil and filler are incorporated into the mixture. The mixtures may also be crosslinked after they are formed into the shape of an article to form vulcanized elastomeric products. The polymer mixtures have utility in a variety of applications.

公开(公告)号：DE69807702T2

公开(公告)日：2003-01-02

申请号：DE69807702

申请日：1998-07-02

Applicant: DOW CHEMICAL CO

Inventor： ANDERSON W ,  CHUM STEVE ,  EVERSDYK A ,  HAZLITT G ,  JAIN PRADEEP ,  SEHANOBISH KALYAN ,  TAU LI-MIN

IPC: B01J8/00 ,  B01J19/24 ,  B29C55/28 ,  B29K23/00 ,  B29L7/00 ,  B29L9/00 ,  B32B27/32 ,  C08F2/01 ,  C08F10/02 ,  C08F110/02 ,  C08F210/02 ,  C08F210/16 ,  C08J5/18 ,  C08L23/04

Abstract: The present invention pertains to a continuous process and polymerization system characterized by separate injection of catalyst and make-up feed, an ethylene interpolymer composition characterized as having broad molecular weight distribution (MWD) and optimized compositional uniformity, a process for making such a composition and a fabricated article made from such composition. The novel composition is characterized as having a melt flow ratio, I10/I2, from 8 to 10.4, a Mw/Mn of greater than 4 as determined by gel permeation chromatography, a melt index, I2, from 0.1 to 10 gram/10 minutes, a density less than 0.945 gram/cubic centimeter, and based on the total weight of crystallizable polymer portions, a weight percent at the dominant peak temperature above 75 DEG C, as determined using crystallization analysis fractionation in the range of 20 to 100 DEG C, equal to or greater than the mathematical product of 1.7946x10 x 10 for composition density in grams/cubic centimeter. The novel composition exhibits good processibility and improved toughness properties, especially excellent film tear and impact resistance, and is particularly well-suited for use in applications such as high performance trash can liners and heavy duty shipping bags.

公开(公告)号：NO313640B1

公开(公告)日：2002-11-04

申请号：NO971819

申请日：1997-04-18

Applicant: DOW CHEMICAL CO

Inventor： DEGROOT JACQUELYN A ,  HAZLITT LONNIE G ,  JAIN PRADEEP ,  KARANDE SEEMA V ,  MERGENHAGEN LAURA K ,  MOLDOVAN DAN G ,  STEWART KENNETH B ,  WHITEMAN NICOLE F

IPC: B65D81/34 ,  B29C47/00 ,  B29K23/00 ,  B29L9/00 ,  B32B27/32 ,  B65D1/00 ,  B65D65/40 ,  C08F110/02 ,  C08F210/08 ,  C08F210/16 ,  C08J5/18 ,  C08L23/04 ,  C08L23/06 ,  C08L23/08 ,  C08L23/16 ,  C09J123/08

Abstract: The subject invention provides a polymer mixture having high heat resistivity, low hexane extractive and controllably lower or higher modulus. The mixture is comprised of at least one first substantially linear ethylene polymer, Component (A), and at least one second ethylene polymer which is a homogeneously branched polymer, heterogeneously branched linear polymer or a non-short chain branched linear polymer. When fabricated into film, the mixture is characterized by a heat seal initiation temperature which is substantially lower than its Vicat softening point as well as a high ultimate hot tack strength. When fabricated as a molded article, the mixture is characterized by high microwave warp distortion while maintaining a lower modulus. The polymer mixture is particularly well-suited for use in multilayer film structures as a sealant layer for such applications as cook-in packages, hot-fill packages, and barrier shrink films. In molding applications, the mixture is well-suited as freezer-to-microwave food storage containers and lids which maintain good flexibility at low temperature to allow easy openability of such containers.

公开(公告)号：DE69715818D1

公开(公告)日：2002-10-31

申请号：DE69715818

申请日：1997-01-22

Applicant: DOW CHEMICAL CO

Inventor： PARIKH R ,  CHUM S ,  JAIN PRADEEP ,  PATEL M ,  CLAYFIELD E ,  MCKEAND J ,  KUMMER G ,  KHAN AHMED ,  MARKOVICH P

IPC: C08L23/04 ,  C08L23/08 ,  C08L91/00 ,  C08L23/16

Abstract: Polymer mixtures are disclosed which comprise at least one homogeneously branched ethylene polymer (A) and at least one ethylene polymer (B) having a crystallinity which is at least 7% greater than the crystallinity of polymer (A) with certain provisos. A process for making a molded article using the disclosed polymer mixtures is disclosed as well as films, film layers, coatings and molded articles formed from those mixtures. These mixtures have several advantages over polymer compositions of the prior art, including improved properties at elevated temperatures such as improved softening point under load, improved hardness, improved toughness, improved 100% modulus of elasticity, improved compression set, improved ability to prevent oil bleed out at lower temperatures when the mixture contains oil and reduced injection molding cycle time. The mixtures retain their performance advantages even when substantial amounts of additives such as oil and filler are incorporated into the mixture. The mixtures may also be crosslinked after they are formed into the shape of an article to form vulcanized elastomeric products. The polymer mixtures have utility in a variety of applications.

公开(公告)号：AT223445T

公开(公告)日：2002-09-15

申请号：AT98933129

申请日：1998-07-02

Applicant: DOW CHEMICAL CO

Inventor： ANDERSON KENNETH W ,  CHUM PAK-WING STEVE ,  EVERSDYK DAVID A ,  HAZLITT LONNIE G ,  JAIN PRADEEP ,  SEHANOBISH KALYAN ,  TAU LI-MIN

IPC: B01J8/00 ,  B01J19/24 ,  B29C55/28 ,  B29K23/00 ,  B29L7/00 ,  B29L9/00 ,  B32B27/32 ,  C08F2/01 ,  C08F10/02 ,  C08F110/02 ,  C08F210/02 ,  C08F210/16 ,  C08J5/18 ,  C08L23/04

Abstract: The present invention pertains to a continuous process and polymerization system characterized by separate injection of catalyst and make-up feed, an ethylene interpolymer composition characterized as having broad molecular weight distribution (MWD) and optimized compositional uniformity, a process for making such a composition and a fabricated article made from such composition. The novel composition is characterized as having a melt flow ratio, I10/I2, from 8 to 10.4, a Mw/Mn of greater than 4 as determined by gel permeation chromatography, a melt index, I2, from 0.1 to 10 gram/10 minutes, a density less than 0.945 gram/cubic centimeter, and based on the total weight of crystallizable polymer portions, a weight percent at the dominant peak temperature above 75 DEG C, as determined using crystallization analysis fractionation in the range of 20 to 100 DEG C, equal to or greater than the mathematical product of 1.7946x10 x 10 for composition density in grams/cubic centimeter. The novel composition exhibits good processibility and improved toughness properties, especially excellent film tear and impact resistance, and is particularly well-suited for use in applications such as high performance trash can liners and heavy duty shipping bags.

公开(公告)号：CA2203128C

公开(公告)日：2002-06-04

申请号：CA2203128

申请日：1995-10-04

Applicant: DOW CHEMICAL CO

Inventor： DEGROOT JACQUELYN A ,  HAZLITT LONNIE G ,  MERGENHAGEN LAURA K ,  JAIN PRADEEP ,  KARANDE SEEMA V ,  MOLDOVAN DAN G ,  STEWART KENNETH B ,  WHITEMAN NICOLE F

IPC: B65D81/34 ,  B29C47/00 ,  B29K23/00 ,  B29L9/00 ,  B32B27/32 ,  B65D1/00 ,  B65D65/40 ,  C08F110/02 ,  C08F210/08 ,  C08F210/16 ,  C08J5/18 ,  C08L23/04 ,  C08L23/06 ,  C08L23/08 ,  C08L23/16 ,  C09J123/08

Abstract: The subject invention provides a polymer mixture having high heat resistivit y, low hexane-extractive and controllably lower or higher modulus. The mixture is comprised of at least one first substantially linear ethylene polymer, Component (A), and at least one second ethylene polymer which is a homogeneously branched polymer, heterogeneously branched linear polymer or a non-high density. When fabricated into film, the mixture is characterized by a heat seal initiation temperature which is substantially lower than its vicat softening point as well as a high ultimate hot tack strength. When fabricate d as a molded article, the mixture is characterized by high microwave warp distortion while maintaining a lower modulus. The polymer mixture is particularly well-suited for use in multilayer film structures as a sealant layer for such applications as cook-in packages, hot-fill packages, and barrier shrink films. In molding applications, the mixture is well-suited as freezer-to-microwave food storage containers and lids which maintain good flexibility at low temperature to allow easy openability of such containers.

公开(公告)号：DE69709076D1

公开(公告)日：2002-01-24

申请号：DE69709076

申请日：1997-04-01

Applicant: DOW CHEMICAL CO

Inventor： KAO I ,  CAMP A ,  COMBS BRUCE ,  EVERSDYK A ,  JAIN PRADEEP ,  STULTZ H ,  WINTER A ,  DENTON P ,  WILSON D ,  WILSON R

IPC: B01J19/00 ,  B01J19/24 ,  C08F2/00 ,  C08F2/04 ,  C08F2/06 ,  C08F10/00 ,  C08F10/02 ,  C08F110/02 ,  C08F210/16

Abstract: A solution polymerization system for polymerizing an olefin monomer by reacting the monomer with catalyst and solvent has been invented. The system in one aspect includes a flow loop with a product polymer outlet, the flow loop forming a recycling reactor, a cataylst inlet on the flow loop through which catalyst and solvent flow into the flow loop, a monomer inlet on the flow loop through which monomer and solvent flow into the flow loop and, with the catalyst, form a reactant material stream, a first heat exchanger on the flow loop for receiving the reactant materials stream and any formed polymer and for removing heat of reaction or polymerization from the flow loop, and pump apparatus for pumping the reactant materials stream and formed polymer in the flow loop and from the first heat exchanger to the product polymer outlet. In one aspect, the system includes at least one additional heat exchanger on the flow loop for receiving the reactant materials stream and formed polymer and for removing heat of reaction or polymerization from the flow loop, the pump apparatus pumping formed polymer and remaining reactant materials to the product polymer outlet, and a portion of the formed polymer and remaining reactant materials flowing out from the product polymer outlet and the remainder recycling through the flow loop. In one aspect systems and methods according to the present invention are used to make polyethylene.