Patent application number | Description | Published |
20100190936 | Polymerization process using a mixed catalyst system - Polyethylene is made by (co)polymerizing ethylene in a gas-phase reactor using a mixed catalyst system comprising a chromium catalyst supported on silica and a Group 4 transition metal catalyst, separately supported on silica. The Group 4 transition metal catalyst is defined by the formula shown, wherein M is a Group 4 metal, PI is a phosphinimide or ketimide ligand (shown), L is a monoanionic ligand which is a cyclopentadienyl or a bulky heteroatom type ligand, m is 1 or 2, n is 0 or 1, and p is an integer. The mixed catalyst system gives access to polyethylene having a broad or bimodal molecular weight distribution. In the copolymerization of ethylene, reversed or partially reversed comonomer distribution is achieved: the supported Group 4 component provides polymer segments having higher molecular weight and also higher comonomer incorporation than polymer segments produced at the supported chromium sites. | 07-29-2010 |
20100190937 | Co-supported catalyst system comprising chromium and group 4 metal complex - Polyethylene is made by (co)polymerizing ethylene in a gas-phase reactor using a catalyst system comprising a chromium catalyst and a Group 4 transition metal catalyst, co-supported on an inorganic oxide support. The Group 4 transition metal catalyst is defined by the formula shown, wherein M is a Group 4 metal, PI is a phosphinimide or ketimide ligand (shown), L is a monoanionic ligand which is a cyclopentadienyl or a bulky heteroatom type ligand, m is 1 or 2, n is 0 or 1, and p is an integer. The co-supported catalyst system gives access to polyethylene having a broad or bimodal molecular weight distribution. In the copolymerization of ethylene, reversed or partially reversed comonomer distribution is achieved: the Group 4 component provides polymer segments having higher molecular weight and also higher comonomer incorporation than polymer segments produced at the chromium sites. | 07-29-2010 |
20110092654 | Reactor continuity - Single site reactor/catalyst continuity in a dispersed phase reaction in terms of initial activation and subsequent deactivation may be improved by treating the support with a metal salt. The activator and catalyst are then deposited on the treated support. The resulting catalyst has a lower consumption of ethylene during initiation and a lower rate of deactivation. Preferably the catalyst is used with an antistatic agent. | 04-21-2011 |
20120041147 | Method of controlling polymer architecture - Carbon dioxide is used to control the ratio of polymer components in a polyethylene composition made using a combination catalyst comprising a chromium catalyst, a single site catalyst and one or more activators. | 02-16-2012 |
20120259070 | REACTOR CONTINUITY - A dual catalyst system comprising a phosphinimine ligand containing catalyst and phenoxide ligand (preferably a salicylaldimine) on a support treated with a metal salt has improved reactor continuity in a dispersed phase reaction in terms of initial activation and subsequent deactivation The resulting catalyst has a lower consumption of ethylene during initiation and a lower rate of deactivation. Preferably the catalyst is used with an antistatic agent. | 10-11-2012 |
20120259080 | REACTOR CONTINUITY - A supported catalyst system comprising a phosphinimine ligand containing catalyst on an alumina support treated with a metal salt has improved reactor continuity in a dispersed phase reaction in terms of initial activation and subsequent deactivation. The resulting catalyst has a lower consumption of ethylene during initiation and a lower rate of deactivation. Preferably the catalyst is used with an antistatic agent. | 10-11-2012 |
20120259081 | REACTOR CONTINUITY - A supported catalyst system comprising a phosphinimine ligand containing catalyst on a porous inorganic support treated with a metal salt has improved reactor continuity in a dispersed phase reaction in terms of initial activation and subsequent deactivation. The resulting catalyst has a lower consumption of ethylene during initiation and a lower rate of deactivation. Preferably the catalyst is used with an antistatic agent. | 10-11-2012 |
20120316297 | Modified phosphinimine catalysts for olefin polymerization - Olefin polymerization is carried out with a supported phosphinimine catalyst which has been treated with a long chain substituted amine compound. | 12-13-2012 |
20120316301 | Methods for controlling ethylene copolymer properties - A method for altering the polymer architecture of ethylene copolymers made with a supported phosphinimine polymerization catalyst. The method involves changing the amount of a catalyst modifier added to a reactor separately from or together with a supported phosphinimine polymerization catalyst. | 12-13-2012 |
20130053524 | Feeding Highly Active Phosphinimine Catalysts to a Gas phase reactor - A highly active, supported phosphinimine catalyst is fed to a gas phase reactor as a slurry in a liquid hydrocarbon. Feeding the catalyst to a gas phase reactor in a viscous liquid hydrocarbon modifies catalyst initiation kinetics. | 02-28-2013 |
20130296507 | REACTOR OPERABILITY IN A GAS PHASE POLYMERIZATION PROCESS - Olefin polymerization is carried out with a single site polymerization catalyst in the presence of a continuity additive. The continuity additive is a cocktail containing one or more dialkanolamide derived from a fatty acid, an oil soluble sulfonic acid and a dialkanolamine. | 11-07-2013 |
20130345377 | Ethylene Copolymers, Film and Polymerization Process - Ethylene copolymers having a relatively high melt flow ratio and a multimodal profile in a temperature rising elution fractionation (TREF) plot are disclosed. The copolymers can be made into film having good dart impact values and good stiffness properties under decreased extruder pressures. | 12-26-2013 |
20140024789 | ADJUSTING POLYMER COMPOSITION - A scavenger is used to indirectly control the ratio of polymer components in a polyethylene composition made using a combination catalyst comprising an inorganic chromium catalyst, and a group 4 single site catalyst. | 01-23-2014 |
20140100343 | ETHYLENE COPOLYMER COMPOSITIONS, FILM AND POLYMERIZATION PROCESSES - Ethylene copolymers having a relatively high melt flow ratio and a multimodal profile in a temperature rising elution fractionation (TREF) plot are disclosed. The copolymers can be made into film having good dart impact values and good stiffness properties under decreased extruder pressures. | 04-10-2014 |
20140357817 | MODIFIED PHOSPHINIMINE CATALYSTS FOR OLEFIN POLYMERIZATION - Olefin polymerization is carried out with a supported phosphinimine catalyst which has been treated with a long chain substituted amine compound. | 12-04-2014 |
20140357818 | MODIFIED PHOSPHINIMINE CATALYSTS FOR OLEFIN POLYMERIZATION - Olefin polymerization is carried out with a supported phosphinimine catalyst which has been treated with a long chain substituted amine compound. | 12-04-2014 |
20140357819 | MODIFIED PHOSPHINIMINE CATALYSTS FOR OLEFIN POLYMERIZATION - Olefin polymerization is carried out with a supported phosphinimine catalyst which has been treated with a long chain substituted amine compound. | 12-04-2014 |
20140363599 | Adjusting Polymer Composition - A scavenger is used to indirectly control the ratio of polymer components in a polyethylene composition made using a combination catalyst comprising an inorganic chromium catalyst, and a group 4 single site catalyst. | 12-11-2014 |
20140378632 | MODIFIED PHOSPHINIMINE CATALYSTS FOR OLEFIN POLYMERIZATION - Olefin polymerization is carried out with a supported phosphinimine catalyst which has been treated with a long chain substituted amine compound. | 12-25-2014 |