W.r. Grace & Co. -conn.

Union Carbide Chemicals & Plastics Technology Corporation

Other

Davidson Textron Inc.

Braskem America, Inc.

Rubberlite, Inc.

Jeffrey Dale Goad

Jan Willem Van Egmond

Linfeng Chen

John Kalevi Kaarto

William George Sheard

Matthew J Fedec

Daniel J Chismar

Kenneth A Nielsen

Ping P Cai

Chai-Jing Chou

Debra R Wilson

Li-Min Tau

Chinsoo Stephen Lee

Peter S Martin

Peter Simon Dias

Maureen M Lein

Jason C Brodil

Daniel W Baugh, Iii

Lise Dahuron

Richard S Cesaretti

Duane F Baumert

Christopher Michael Brown

Gary F Pelletier

Robert C Brady, Iii

A process comprising polymerizing olefin monomers and optionally comonomers in a first reactor vessel, thereby forming a raw product stream comprising polymerized solids, unreacted monomer and optionally comonomer, the polymerized solids comprising olefin polymer, volatile organic compounds (VOC) and catalyst system. Then the polymerized solids are contacted with a catalyst poison selected from carbon monoxide, carbon dioxide, oxygen, water, alcohols, amines, or mixtures thereof, thereby forming a passivated stream. The passivated stream is maintained in an agitated state within a second reactor. The passivated stream within the second reactor is then contacted with a circulating gas comprising unreacted monomer for a residence time, thereby reducing the concentration of VOC in the polymerized solids by at least 10 wt % compared to the level before entering the second reactor, thereby forming a purified olefin polymer solids stream.

Process for efficient polymer particle purging

The present disclosure is directed to a foam tape product that does not require a release paper or other release material to prevent sticking on or within itself upon rolling. A method of manufacturing the foam tape product and kit are also provided.

Foam tape

The present invention relates to an improvement for gas-phase olefin polymerization process having relatively high bed bulk density. The improvement involves the use of mixed external electron donors when polymerizing propylene in a gas-phase reactor having a polymer bed with a bulk density greater than 128 kg/m, optionally with one or more comonomers, wherein the mixed electron donor system comprises at least a first external electron donor and a second external electron donor, and wherein the first external electron donor is a carboxylate compound.

Process for gas-phase polymerization having high bed bulk density

A composition is provided which comprises a propylene ethylene random copolymer having a melt flow rate (MFR) (as determined according to ASTM D1238, 230&#xb0; C., 2.16 Kg) of less than 1 g/10 min, a xylene solubles content of less than 7% by weight, an ethylene content of from 3 to 5 percent by weight of the copolymer, and a value equal to or greater than 92 for the product of the Koenig B value times the % mm triads measured on the xylene insoluble fraction of the random copolymer obtained by the wet method. Pipes made from the composition demonstrate improved pressure endurance.

Propylene ethylene random copolymer suitable for pipe

A gas-phase process for making a propylene-based polymer in a fluidized-bed reactor, the reactor containing a fluidized bed including polymer product particles and a catalyst, the process having a set of quantitative criteria for maximum monomer partial pressure, maximum reactor temperature, and comonomer content(s) in the propylene-based polymer. The propylene-based polymer may be EBPT or BPRCP. The catalyst may include a catalyst/donor system comprising (1) a supported Ziegler-Natta pro-catalyst, (2) a co-catalyst, and (3) a mixed external electron donor system including (a) an activity limiting agent including at least one carboxylate ester functional group, and (b) a selectivity control agent.

Producing high comonomer content propylene-based polymers

A process for producing a propylene impact copolymer (ICOP), the process comprising the steps of feeding propylene and optionally one or more first comonomers into a first reactor; feeding into the first reactor a catalyst mixture; contacting the propylene with the catalyst mixture under first polymerization conditions to form an active propylene-based polymer; transferring at least a portion of the first reactor contents to a second reactor; feeding additional activity limiting agent, additional selectivity control agent and, optionally additional cocatalyst and one or more second comonomers into the second reactor; and maintaining the second reactor at a second reactor temperature in a range that is sufficient to allow copolymerization to form the propylene impact copolymer (ICOP), wherein the second reactor temperature is below 70&#xb0; C.

Producing propylene impact copolymers and products

The present disclosure is directed to a process for producing olefin-based polymer in a gas phase polymerization reactor. The process includes forming a wet zone in the gas phase polymerization reactor. The wet zone is formed by maintaining a temperature less than or equal to the fluidizing medium dew point temperature+2&#xb0; C. in a region of the reactor. The region is defined as the region extending from the distributor plate to 2.5 meters above the distributor plate. Injection of a high activity catalyst composition in the wet zone produces olefin-based having a settled bulk density greater than 23.5 lb/ft3.

Gas-phase polymerization process with wet zone

The present disclosure provides a polymerization process for the production of a high melt flow propylene impact copolymer. The process includes contacting an active propylene-based polymer having a melt flow rate greater than about 100 g/10 min with one or more olefins in a polymerization reactor to form the propylene impact copolymer with a melt flow rate greater than about 60 g/10 min. The production of the high melt flow propylene impact copolymer may occur in one or more polymerization reactors, utilizing standard hydrogen concentration, and no visbreaking.

High melt flow propylene impact copolymer and method

Propylene impact copolymers (ICPs) are provided which comprise: (a) a matrix phase which comprises from 60 to 95 weight % of a polypropylene polymer containing from 0 to 6 mole % of units derived from one or more alpha-olefins other than propylene, and (b) a dispersed phase which comprises from 5 to 40 weight % of a copolymer derived from a first comonomer which can be either propylene or ethylene together with a second alpha-olefin comonomer. The ICP is further characterized by having a beta/alpha ratio less than or equal to 1.1. The ICPs of the present invention are particularly well suited for applications requiring clear, tough polymers such as thin walled injection molded articles for frozen food packaging applications.

Propylene impact copolymers having good optical properties

The present invention is directed to methods for the spray application of additive compositions containing additive materials in the manufacture of sheet material products, such as paper products, textile products, and flexible sheet products by using compressed fluids, such as carbon dioxide and ethane, as a spraying medium. Additive compositions with high viscosity and which are substantially free of water and/or volatile solvent can be applied to sheet materials. Water-borne additive compositions with reduced water content can also be applied to sheet materials. One preferred spray method uses a decompressive spray of the compressed fluid which produces a uniform spray pattern and a narrow droplet size distribution that can improve application efficiency and quality when additive compositions are applied during the spraying step to rapidly conveyed sheet materials.

Spray application of an additive composition to sheet materials

A process for manufacturing a metallized part using the island coating method, including spray depositing a primer layer, basecoat layer, or combined primer/basecoat layer. Each layer contains an increased amount of film forming polymer by using liquid CO.sub.2 as a supplemental carrier along with a reduced amount of organic solvent carrier thereby reducing waste disposal costs and environmental concerns. Further, this modified island coating system can be used to deposit layers of 1.5 to 2.0 mils thick and maintain the aesthetic properties of the metallizing island coating system at a reduced cost and with minimal variability among parts.

Reduced solvent island coating system

This invention relates to a method and system for proportionating, mixing, pressurizing, heating and supplying a coating formulation, wherein a microporous membrane injector/mixer located in the relevant section of the system so that undesirable precipitation of solid polymer from the coating formulation is subsequently avoided.

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Barboursville, WV, United States of America

Jeffrey Dale Goad