Chevron Phillips Chemical Company LP

Deloris R Gagan

Max P McDaniel

Kathy S Clear

William Chadwick Ellis

Mark L Hlavinka

Yongwoo Inn

Chung Ching Tso

Randy S Muninger

Eric D Schwerdtfeger

Carlos A Cruz

Ted H Cymbaluk

Masud M Monwar

Qing R Yang

Guylaine St Jean

Brooke A Gill

Qing Yang

Processes for activating chromium polymerization catalysts, which can use lower maximum activation temperatures and shorter activation times than conventional activation methods, and provide polyethylenes with high melt indices, broader molecular weight distributions, and lower long chain branching content. The activation process can comprise heating a supported chromium catalyst in an inert atmosphere to a first temperature (T) for a first hold time (t), followed by allowing the chromium catalyst to attain a second temperature (T) in the inert atmosphere, then contacting the chromium catalyst with an oxidative atmosphere for a second hold time (t), in which Tcan be less than or equal to T. Additional activation treatments and conditioning steps are disclosed which can be used to enhance the melt index potential of Phillips (Cr/silica) catalysts.

Rapid activation process and activation treatments for chromium catalysts for producing high melt index polyethylenes

A method comprising contacting a silica support with a titanium-containing solution to form a titanated silica support, wherein the titanium-containing solution comprises a solvent; a ligand comprising a glycol, a carboxylate, a peroxide, or a combination thereof, and a titanium compound having the formula Ti(acac)(OR), wherein 'acac' is acetylacetonate and wherein each R independently is ethyl, isopropyl, n-propyl, isobutyl, or n-butyl.

Aqueous titanation of cr/silica catalysts by the use of acetylacetonate and another ligand

A pre-catalyst composition comprising: a) a silica support comprising silica wherein an amount of silica is in a range of from about 70 wt. % to about 95 wt. % based upon a total weight of the silica support; b) a titanium-containing compound wherein an amount of titanium is in a range of from about 0.1 wt. % to about 10 wt. % based upon the total weight of the silica support; c) a chromium-containing compound wherein an amount of chromium is in a range of from about 0.1 wt. % to about 10 wt. % based upon the total weight of the silica support; d) a surfactant wherein the surfactant comprises a non-ionic surfactant, a cationic surfactant, or a combination thereof; e) a carboxylate wherein the carboxylate comprises a multi carboxylate, an alpha-hydroxy carboxylate, or a combination thereof; and f) a solvent.

Surfactant as titanation ligand

A pre-catalyst composition comprising: a) a silica support comprising silica wherein an amount of silica is in a range of from about 70 wt. % to about 95 wt. % based upon a total weight of the silica support; b) a titanium-containing compound wherein an amount of titanium is in a range of from about 0.1 wt. % to about 10 wt. % based upon the total weight of the silica support; c) a chromium-containing compound wherein an amount of chromium is in a range of from about 0.1 wt. % to about 10 wt. % based upon the total weight of the silica support; d) a surfactant wherein the surfactant comprises a non-ionic surfactant, a cationic surfactant, or a combination thereof, e) a carboxylate wherein the carboxylate comprises a multi carboxylate, an alpha-hydroxy carboxylate, or a combination thereof, and f) a solvent.

Catalyst preparation systems and methods for preparing reduced chromium catalysts are disclosed, and can comprise irradiating a supported chromium catalyst containing hexavalent chromium with a light beam having a wavelength within the UV-visible light spectrum. Such reduced chromium catalysts have improved catalytic activity compared to chromium catalysts reduced by other means. The use of the reduced chromium catalyst in polymerization reactor systems and olefin polymerization processes also is disclosed, resulting in polymers with a higher melt index.

Light treatment of chromium catalysts and related catalyst preparation systems and polymerization processes

A method comprising contacting a silica support with a titanium-containing solution to form a titanated silica support, wherein the titanium-containing solution comprises a titanium compound, a solvent, and an amino acid. Also disclosed are olefin polymerization catalysts and pre-catalyst compositions thereof and methods of preparing olefin polymerization catalysts and pre-catalyst compositions thereof.

Amino acid chelates of titanium and use thereof in aqueous titanation of polymerization catalysts

A method comprising contacting a silica support with a titanium-containing solution to form a titanated silica support, wherein the titanium-containing solution comprises a solvent; a ligand comprising a glycol, a carboxylate, a peroxide, or a combination thereof; and a titanium compound having the formula Ti(acac)(OR), wherein 'acac' is acetylacetonate and wherein each R independently is ethyl, isopropyl, n-propyl, isobutyl, or n-butyl.

Aqueous titanation of Cr/silica catalysts by the use of acetylacetonate and another ligand

A method comprising contacting a silica support with a titanium-containing solution to form a titanated silica support, wherein the titanium-containing solution comprises a titanium compound, a solvent, and an amino acid. The method further comprising drying the titanated silica support to form a pre-catalyst composition; contacting a chromium-containing compound with the silica support, the titanated silica support, the pre-catalyst composition, or combinations thereof; and calcining the pre-catalyst composition to form an olefin polymerization catalyst.

A method for an olefin polymerization catalyst comprises contacting a silica support or a chromium-silica support with titanium to produce a Cr/Si&#x2014;Ti catalyst. A titanium-containing solution is used to facilitate the association of titanium with the support, wherein the titanium-containing solution is formed by contacting a solvent, an amino acid, optionally a peroxide, optionally a carboxylate and a titanium-containing compound. A method for preparation of an olefin polymerization catalyst comprises contacting a chromium-silica support with the titanium-containing solution under conditions suitable to form a pre-catalyst composition and further processing the pre-catalyst composition to produce a Cr/Si&#x2014;Ti catalyst. A method for preparation of an olefin polymerization catalyst comprises contacting a silica support with the titanium-containing solution and a chromium-containing compound under conditions suitable to form a pre-catalyst composition and further processing the pre-catalyst composition to produce a Cr/Si&#x2014;Ti catalyst.

A pre-catalyst composition comprising: a) a silica support comprising silica wherein an amount of silica is in a range of from about 70 wt. % to about 95 wt. % based upon a total weight of the silica support; b) a titanium-containing compound wherein an amount of titanium is in a range of from about 0.1 wt. % to about 20 wt. % based upon a total weight of the silica within the pre-catalyst composition; c) a chromium-containing compound wherein an amount of chromium is in a range of from about 0.01 wt. % to about 10 wt. % based upon a total weight of the silica within the pre-catalyst composition; d) a surfactant wherein the surfactant comprises a non-ionic surfactant, a cationic surfactant, or a combination thereof; e) a carboxylate wherein the carboxylate comprises a multi carboxylate, an alpha-hydroxy carboxylate, or a combination thereof; and f) a solvent.

Disclosed herein are ethylene-based polymers generally characterized by a Mw ranging from 70,000 to 200,000 g/mol, a ratio of Mz/Mw ranging from 1.8 to 20, an IB parameter ranging from 0.92 to 1.05, and an ATREF profile characterized by one large peak. These polymers have the dart impact, tear strength, and optical properties of a metallocene-catalyzed LLDPE, but with improved processability, melt strength, and bubble stability, and can be used in blown film and other end-use applications.

Dual catalyst system for producing LLDPE copolymers with a narrow molecular weight distribution and improved processability

A method comprising contacting a silica support with a titanium-containing solution to form a titanated silica support, wherein the titanium-containing solution comprises a titanium compound, a solvent, and a surfactant.

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Ramona, OK, United States of America

Deloris R Gagan