Abstract:
Provided are bulk homogeneous polymerization processes for producing ethylene propylene random copolymers. The process includes contacting in a reactor or in a series of reactors propylene monomer, ethylene comonomer with one or more catalyst systems and optional solvent, wherein the reactor train is at a temperature of between 65'C and 180'C and at a pressure no lower than 10 MPa below the cloud point pressure of the polymerization system and less than 1500 MPa, and wherein the polymerization system for the reactor train is in its dense fluid state to form a polymer reactor effluent including a homogeneous fluid phase polymer-monomer mixture in the reactor train, and wherein the resultant copolymer product comprises between 10 wt% and 20 wt% randomly distributed ethylene and the concentration of total region defects in the continuous propylene segments of the random EP copolymer is between 40 and 150%.
Abstract:
A process for in-line blending of plasticizers and polymers in a single reactor train including one or more serially configured reactors, a high-pressure separator downstream fluidly connected to the train, and one or more storage tanks, wherein the train produces one or more base polymer components and the one or more storage tanks store one or more off-line produced plasticizers; contacting in the reactor train olefin monomers, catalyst systems and optional comonomers, scavengers, diluents or solvents, at a temperature above the solid-fluid phase transition temperature of the polymerization system and a pressure no lower than 10 MPa below the cloud point pressure of the polymerization system and less than 1500 MPa, forming a reactor effluent including a homogeneous mixture; passing the reactor effluent through theseparator to separate a monomer-rich phase from a polymer-rich phase; and feeding the plasticizers to the process after the reactor train.
Abstract:
This invention relates to a process to polymerize olefins comprising contacting, at a temperature of 600C or more and a pressure of at least 15 MPa, one or more olefin monomers having three or more carbon atoms, with: 1) a catalyst system comprising one or more activators and one or more nonmetallocene metal-centered, heteroaryl ligand catalyst compounds, where the metal is chosen from the Group 4, 5, 6, the lanthanide series, or the actinide series of the Periodic Table of the Elements, 2) optionally one or more comonomers, 3) optionally diluent or solvent, and 40 optionally solvent, wherein: a) the olefin monomers and any comonomers are present in the polymerization system at 40 weight % or more, b) the monomer having three or more carbon atoms is present at 80 wt% or more based upon the weight of all monomers and comonomers present in the feed, c) the polymerization occurs at a temperature above the solid- fluid phase transition temperature of the polymerization system and a pressure no lower than 10 MPa below the cloud point pressure of the polymerization system and less than 1500 MPa, in the event the solid-fluid phase transition temperature of the polymerization system cannot be determined then the polymerization occurs at a temperature above the fluid fluid phase transition temperature.
Abstract:
An in-line fluid phase process for blending low crystallinity polymer components (LCPCs) and high crystallinity polymer components (HCPCs) to form pellet-stable polyolefin pellets is provided. The in-line process for producing the blend includes providing two or more parallel reactor trains and one or more separators for product blending and product-feed separation; wherein the two or more reactor trains producting the LCPC and HCPC blend components operate under fluid phase bulk homogeneous conditions, and at least one of the reactor trains operates under supercritical conditions. The HCPC blend component is a high crystallinity polypropylene-based polymer. The LCPC blend component is a low crystallinity ethylene-based or propylene-based polymer. The resultant blend pellets exhibit a reduced tendency or an eliminated tendency to agglomerate during shipping, handling and storage.