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Max P. McDaniel

Other affiliations: Thorn, Chevron Corporation, ConocoPhillips  ...read more
Bio: Max P. McDaniel is an academic researcher from Philips. The author has contributed to research in topics: Polymerization & Catalysis. The author has an hindex of 49, co-authored 322 publications receiving 8897 citations. Previous affiliations of Max P. McDaniel include Thorn & Chevron Corporation.


Papers
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Patent
22 Nov 2004
TL;DR: In this paper, the authors provide a set of compositions that are useful for polymerizing at least one monomer into at least two polymers and at least three polymers, respectively.
Abstract: This invention provides a compositions that are useful for polymerizing at least one monomer into at least one polymer.

779 citations

Book ChapterDOI
Max P. McDaniel1
TL;DR: In this article, supported chromium (Cr) catalysts for polyethylene polymerization were discussed, and the Phillips Cr/silica polymerization catalyst was prepared by impregnating a Cr compound onto wide pore silica and then calcining in oxygen to activate the catalyst.
Abstract: Publisher Summary This chapter discusses supported chromium (Cr) catalysts for ethylene polymerization. The Phillips Cr/silica polymerization catalyst is prepared by impregnating a Cr compound onto wide pore silica and then calcining in oxygen to activate the catalyst. This leaves Cr in the hexavalent state, monodispersed on the silica surface. Chromium trioxide (CrO3) has been impregnated most commonly, but even a trivalent Cr salt can be used because oxidation to Cr(VI) occurs during calcining. Dichromate is the main species in CrO3 solutions. Trivalent Cr salts, notably CrCl3, impregnated onto silica and calcined under vacuum, are found to polymerize ethylene. Three processes are used commercially to make linear polyethylene—namely, solution, slurry, and gas phase. All these processes are called “low-pressure processes” to distinguish them from the free radical or high-pressure process that makes highly branched polyethylene. The slurry process is very convenient for batch polymerization studies. The diluent permits precise control of the temperature and serves to dissolve ethylene and other reactants that must contact the catalyst during polymerization.

244 citations

Patent
01 Dec 2000
TL;DR: In this paper, the authors proposed a method for synthesizing at least one monomer to produce a polymer, wherein the catalyst composition comprises contacting an organometal compound, an organoaluminum compound, and a treated solid oxide compound.
Abstract: This invention provides catalyst compositions that are useful for polymerizing at least one monomer to produce a polymer. This invention also provides catalyst compositions that are useful for polymerizing at least one monomer to produce a polymer, wherein said catalyst composition comprises contacting an organometal compound, an organoaluminum compound, and a treated solid oxide compound.

186 citations

Journal ArticleDOI
TL;DR: The Phillips Cr/silica polymerization catalyst has been examined by means of X-ray photoelectron spectroscopy and chemical methods, and the results have been compared to activity measurements from a high-pressure autoclave as discussed by the authors.

181 citations

Patent
26 Sep 2000
TL;DR: In this paper, a post-contacted organometal compound was used for polymerizing at least one monomer to produce a polymer, which is useful for polymeric synthesis.
Abstract: This invention provides catalyst compositions that are useful for polymerizing at least one monomer to produce a polymer. This invention also provides catalyst compositions that are useful for polymerizing at least one monomer to produce a polymer, wherein said catalyst composition comprises a post-contacted organometal compound, a post-contacted organoaluminum compound, and a post-contacted fluorided silica-alumina.

174 citations


Cited by
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Patent
10 Jun 2011
TL;DR: In this article, a surgical stapling device particularly suited for endoscopic procedures is described, which includes a handle assembly and an elongated body extending distally from the handle assembly.
Abstract: A surgical stapling device particularly suited for endoscopic procedures is described The device includes a handle assembly and an elongated body extending distally from the handle assembly The distal end of the elongated body is adapted to engage a disposable loading unit A control rod having a proximal end operatively connected to the handle assembly includes a distal end extending through the elongated body A control rod locking member is provided to prevent movement of the control rod until the disposable loading unit is fully secured to the elongated body of the stapling device

2,013 citations

Patent
15 Oct 1992
TL;DR: Elastic substantially linear olefin polymers are disclosed in this paper which have processability similar to highly branched low density polyethylene (LDPE), but the strength and toughness of linear LDPE, and can also have from 0.01 to 3 long chain branches/1000 carbons along the polymer backbone.
Abstract: Elastic substantially linear olefin polymers are disclosed which have processability similar to highly branched low density polyethylene (LDPE), but the strength and toughness of linear low density polyethylene (LLDPE). The polymers have processing indices (PI's) less than or equal to 70 percent of those of a comparative linear olefin polymer and a critical shear rate at onset of surface melt fracture of at least 50 percent greater than the critical shear rate at the onset of surface melt fracture of a traditional linear olefin polymer at about the same I2 and Mw?Mn. The novel polymers can also have from 0.01 to 3 long chain branches/1000 carbons along the polymer backbone and have higher low/zero shear viscosity and lower high shear viscosity than comparative linear olefin polymers. The novel polymers can also be characterized as having a melt flow ratio, I10/I2, » 5.63, a molecular weight distribution, Mw/Mn, defined by the equation: Mw/Mn « (I10/I2) - 4.63, and a critical shear stress at onset of gross melt fracture greater than 4 x 10?6? dyne/cm2.

1,540 citations

Patent
30 Sep 2004
TL;DR: In this paper, a surgical stapling instrument (1) comprises a body portion (2, 3), a handle (4), and a staple fastening assembly (8), which includes a curved cartridge (10), which comprises at least one curved open row of staples, and a curved anvil (22), which is adapted to cooperate with the cartridge for forming the ends of the staples exiting from the cartridge.
Abstract: A surgical stapling instrument (1) comprises a body portion (2, 3), a handle (4) and a staple fastening assembly (8). The staple fastening assembly (8) includes a curved cartridge (10), which comprises at least one curved open row of staples, and a curved anvil (22), which is adapted to cooperate with the cartridge (10) for forming the ends of the staples exiting from the cartridge (10). The staple fastening assembly (8) is adapted to allow unobstructed access towards the concave inner faces of the cartridge (10) and the anvil (22). The cartridge (10) can be moved towards the anvil (22) from a spaced position for positioning tissue therebetween to a closed position for clamping the tissue. Preferably, a knife is contained within the cartridge (10) and is positioned such that there is at least one row of staples on at least one side of the knife.

1,502 citations

Patent
14 Jun 2016
TL;DR: Newness and distinctiveness is claimed in the features of ornamentation as shown inside the broken line circle in the accompanying representation as discussed by the authors, which is the basis for the representation presented in this paper.
Abstract: Newness and distinctiveness is claimed in the features of ornamentation as shown inside the broken line circle in the accompanying representation.

1,500 citations

Patent
21 Apr 2011
TL;DR: In this paper, a surgical instrument can comprise a channel configured to support a staple cartridge and, in addition, an anvil pivotable between open and closed positions relative to the channel.
Abstract: A surgical instrument can comprise a channel configured to support a staple cartridge and, in addition, an anvil pivotable between open and closed positions relative to the channel. The surgical instrument can further comprise a cutting member configured to incise tissue positioned captured between the staple cartridge and the anvil and, in addition, means for stopping the cutting member prior to a distal end datum, wherein the distal end datum can be defined by the distal-most staple cavity in the staple cartridge. In such embodiments, the incision within the tissue may not extend beyond the portion of the tissue that has been stapled.

1,498 citations