Patents by Inventor Ronald D. Mathis
Ronald D. Mathis has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 4956408Abstract: A conjugated diene/monovinyl substituted aromatic hydrocarbon copolymer is stabilized by the addition of a complex acrylate, in combination with at least one of an alkyl thiopropionate, an organic phosphite and a non-acrylate substituted hindered phenolic compound.Type: GrantFiled: June 13, 1988Date of Patent: September 11, 1990Assignee: Phillips Petroleum CompanyInventors: Ronald D. Mathis, Alonzo G. Kitchen, Frank J. Szalla
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Patent number: 4781559Abstract: An automated system is provided for selectively separating resin pellets having a gel count below a specified maximum from pellets having a gel count above the specified maximum, while the pellets are flowing in a pneumatic conveyor. The separation is based on an essentially continuous measurement in which a laser beam is utilized to detect the number of gels in a film made from pellets withdrawn as a sample stream from the main pellet stream. In response to the gel count measurement, a control signal is established that is utilized to manipulate a diverter valve located in the pneumatic conveyor, which diverts pastic pellet flow between a preferred storage means storing pellets having a low gel count and a secondary storage means for storing pellets having a higher gel count.Type: GrantFiled: December 24, 1987Date of Patent: November 1, 1988Assignee: Phillips Petroleum CompanyInventors: Ronald D. Mathis, Gregory M. Swisher, Alejandro V. Santin
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Patent number: 4756855Abstract: An automated method is provided for selectively separating resin pellets having a gel count below a specified maximum from pellets having a gel count above the specified maximum, while the pellets are flowing in a pneumatic conveyor. The separation is based on an essentially continuous measurement in which a laser beam is utilized to detect the number of gels in a film made from pellets withdrawn as a sample stream from the main pellet stream. In response to the gel count measurement, a control signal is established that is utilized to manipulate a diverter valve located in the pneumatic conveyor, which diverts plastic pellet flow between a preferred storage means storing pellets having a low gel count and a secondary storage means for storing pellets having a higher gel count.Type: GrantFiled: April 4, 1986Date of Patent: July 12, 1988Assignee: Phillips Petroleum CompanyInventors: Ronald D. Mathis, Gregory M. Swisher, Alejandro V. Santin
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Patent number: 4548971Abstract: Polymer compositions and method for improving processability of compositions of normally solid polymers of arylene sulfides by the addition of at least one of cyanurate and isocyanurate compounds in an amount effective to improve the processability of the composition. In a preferred embodiment the amount of cyanurate and isocyanurate in the total composition is in the range of about 0.1 to about 10 weight percent. The invention is applicable to improving the processing characteristics and other properties of arylene sulfide polymers and filled arylene sulfide polymers.Type: GrantFiled: July 30, 1984Date of Patent: October 22, 1985Assignee: Phillips Petroleum CompanyInventors: Robert J. Martinovich, Ronald D. Mathis, Roger T. Shiflet
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Patent number: 4543224Abstract: The heat stability of arylene sulfide resins, such as poly(p-phenylene sulfide) resin, is improved by the addition of cure retarders comprising phenolic amide or ester-based antioxidants. The resin compositions of the invention are particularly applicable for reducing gel formation during melt extrusion.Type: GrantFiled: February 3, 1984Date of Patent: September 24, 1985Assignee: Phillips Petroleum CompanyInventors: Jerry O. Reed, Ronald D. Mathis
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Patent number: 4535117Abstract: The heat stability of arylene sulfide polymers, such as poly(p-phenylene sulfide) is improved by the addition of cure retarders comprising metal sorbates and, optionally, an alkaline earth metal nitrite.Type: GrantFiled: November 2, 1983Date of Patent: August 13, 1985Assignee: Phillips Petroleum CompanyInventors: Ronald D. Mathis, Jerry O. Reed
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Patent number: 4530968Abstract: A composition of resinous, non-elastomeric block copolymer of a conjugated diene and a vinylarene in an amount of polyvinylchloride sufficient to provide synergistic notched Izod impact strength as determined by ASTM D-256. A method for preparing this polymeric composition.Type: GrantFiled: June 19, 1984Date of Patent: July 23, 1985Inventors: Gregory M. Swisher, Ronald D. Mathis
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Patent number: 4500706Abstract: A method of producing poly(arylene sulfide) resin suitable for the commercial production of fibers. The method includes the two stage melt filtration of a suitable poly(arylene sulfide) polymer, e.g., poly(p-phenylene sulfide), through a primary filter having an absolute micron rating of no more than about 125 microns, and through a secondary filter having a maximum absolute micron rating of about 80 or a substantially equivalent filter capacity. Also disclosed are various forms of apparatus for performing the method. In one form the apparatus employs a depth type filter of metallurgically bonded micronic size stainless steel fibers as the primary filter and one or more edge sealed screen combinations each containing one 325 mesh screen as the secondary filter. A secondary filter comprising a mesh screen and a quantity of suitable sand is also disclosed.Type: GrantFiled: August 9, 1982Date of Patent: February 19, 1985Assignee: Phillips Petroleum CompanyInventors: Ronald D. Mathis, Jerry O. Reed, Gerald E. Hagler
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Patent number: 4478969Abstract: The heat stability of arylene sulfide resins, such as poly(p-phenylene sulfide) resin, is improved by the addition of cure retarders comprising an aminotriazole. The resin compositions of the invention are particularly applicable for reducing gel formation during melt extrusion.Type: GrantFiled: June 22, 1983Date of Patent: October 23, 1984Assignee: Phillips Petroleum CompanyInventors: Jerry O. Reed, Ronald D. Mathis
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Patent number: 4447597Abstract: A method for adjusting the cure rate of a mixture of arylene sulfide polymer particles in which the particles of an arylene sulfide polymer mixture are classified by size groups, the size groups of classified particles are segregated, and at least one size group is removed from the mixture. In a further embodiment at least one size group of classified particles removed from one mixture is added to another mixture of polymer particles. In another embodiment the further use of the segregated size groups of classified particles is based upon a determination of the cure rate of at least one segregated size group of particles.Type: GrantFiled: September 24, 1982Date of Patent: May 8, 1984Assignee: Phillips Petroleum CompanyInventors: Ronald D. Mathis, Jerry A. Reed
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Patent number: 4445941Abstract: A process for the removal of poly(arylene sulfide) deposits on metal surfaces is provided by contacting the deposit with at least one diaryl ether under temperature conditions and for a time sufficient to remove said poly(arylene sulfide) deposits. A process for the cleansing of metal parts having poly(arylene sulfide) deposits is also provided which comprises treatment with a diaryl ether, and thereafter contacting the ether treated part with an alcohol, washing the part with water, drying the part, and thereafter contacting the dried part with concentrated HNO.sub.3 followed by water washing and drying.Type: GrantFiled: July 22, 1982Date of Patent: May 1, 1984Assignee: Phillips Petroleum CompanyInventors: Ronald D. Mathis, Jerry O. Reed
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Patent number: 4435221Abstract: A process for the removal of poly(arylene sulfide) deposits is provided which comprises contacting said deposits with a solution comprising an alkali metal hydrosulfide in a lactam. In addition, a process for the cleaning of metal parts having poly(arylene sulfide) deposits is provided by contacting the metal parts in the manner as described immediately above, contacting the metal part with a lower alkyl alcohol, washing said metal part with water, drying said metal part, contacting the dried part with concentrated HNO.sub.3 followed by water washing and drying.Type: GrantFiled: July 30, 1982Date of Patent: March 6, 1984Assignee: Phillips Petroleum CompanyInventors: Ronald D. Mathis, Jerry O. Reed
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Patent number: 4434122Abstract: The heat stability of arylene sulfide resins, such as poly(p-phenylene sulfide) resin, is improved by the addition of cure retarders comprising phenolic amide or ester-based antioxidants. The resin compositions of the invention are particularly applicable for reducing gel formation during melt extrusion.Type: GrantFiled: May 11, 1982Date of Patent: February 28, 1984Assignee: Phillips Petroleum CompanyInventors: Jerry O. Reed, Ronald D. Mathis
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Patent number: 4421910Abstract: The curing of arylene sulfide polymers is accelerated by the addition of an effective amount of at least one metal salt of dihydrocarbyldithiophosphinic acid.Type: GrantFiled: September 24, 1982Date of Patent: December 20, 1983Assignee: Phillips Petroleum CompanyInventor: Ronald D. Mathis
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Patent number: 4418029Abstract: The heat stability of arylene sulfide resins, such as poly(p-phenylene sulfide) resin, is improved by the addition of cure retarders comprising Group IIA or Group IIB metal salts of fatty acids. The resin compositions of the invention are particularly applicable for reducing gel formation during melt extrusion.Type: GrantFiled: May 11, 1982Date of Patent: November 29, 1983Assignee: Phillips Petroleum CompanyInventors: Jerry O. Reed, Ronald D. Mathis
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Patent number: 4413081Abstract: The heat stability of arylene sulfide polymers, such as poly(p-phenylene sulfide), is improved by the addition of cure retarders comprising Group 8 metal dihydrocarbyldithiocarbamates.Type: GrantFiled: February 1, 1983Date of Patent: November 1, 1983Assignee: Phillips Petroleum CompanyInventors: Ronald D. Mathis, Jerry O. Reed
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Patent number: 4411853Abstract: The heat stability of arylene sulfide resins, such as poly(p-phenylene sulfide) resin, is improved by the addition of cure retarders comprising certain organotin compounds such as the dialkyltin dicarboxylates. The resin compositions of the invention are particularly applicable for reducing gel formation during melt extrusion.Type: GrantFiled: May 11, 1982Date of Patent: October 25, 1983Assignee: Phillips Petroleum CompanyInventors: Jerry O. Reed, Ronald D. Mathis
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Patent number: 4405745Abstract: The heat stability of arylene sulfide polymers, such as poly(p-phenylene sulfide), is improved by the addition of cure retarders comprising alkaline earth metal nitrites.Type: GrantFiled: September 24, 1982Date of Patent: September 20, 1983Assignee: Phillips Petroleum CompanyInventors: Ronald D. Mathis, Jerry O. Reed
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Patent number: 4185004Abstract: A multi-component ultraviolet stabilizer system for pigmented polyolefins comprising a tris-(4-hydroxybenzyl) isocyanurate, a substituted pentaerythritol phosphite, and a trihydrocarbyl thiophosphite. In an alternate embodiment the stabilizer system also comprises a thiomethylenephenol.Type: GrantFiled: April 27, 1977Date of Patent: January 22, 1980Assignee: Phillips Petroleum CompanyInventor: Ronald D. Mathis
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Patent number: 4069277Abstract: In polyamide compositions containing the reaction product of (1) a block copolymer of propylene oxide, ethylene oxide and an alkylene diamine and (2) a dicarboxylic acid ester in an amount sufficient to provide improved antistatic characteristics to the polyamide, the apparent dyeability can be increased by including in said polyamide composition a sufficient amount of at least one zinc dihydrocarbyl dithiophosphinate.Type: GrantFiled: March 2, 1976Date of Patent: January 17, 1978Assignee: Phillips Fibers CorporationInventors: Ronald D. Mathis, James S. Dix