Patents Assigned to Copolymer Rubber
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Patent number: 5397835Abstract: Novel thermoplastic elastomer compositions, made by dispersing a polyolefin elastomer phase containing functionalized EPM or EPDM in a polyamide resin followed by cross-linking of the elastomer phase, are described. The cross-linked phase exists as discreet particles, providing an overall blend which remains thermoplastic. The resulting blend may be used in the fabrication of elastomeric goods without the need for a separate vulcanization step after the desired object is formed.Type: GrantFiled: September 24, 1993Date of Patent: March 14, 1995Assignee: Copolymer Rubber & Chemical CorporationInventor: Errol J. Olivier
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Patent number: 5314948Abstract: Thermoplastic polyester, copolyester and polyblend molding compositions impact-modified by glycidyl methacrylate grafted EPDM exhibit high impact strength combined with good knit-line characteristics, when the grafted comonomer content exceeds 2 percent by weight in the impact modifier, it has a gel content in the range of from about 10 to about 80 weight percent.Type: GrantFiled: June 24, 1991Date of Patent: May 24, 1994Assignees: Copolymer Rubber, Chemical CorporationInventors: Charles F. Pratt, Shrikant V. Phadke, Errol Olivier
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Patent number: 5179169Abstract: Thermoplastic polyester, copolyester and polyblend molding compositions impact-modified by glycidyl methacrylate grafted EPDM exhibit high impact strength combined with good knit-line characteristics, when the grafted comonomer content exceeds 2 percent by weight in the impact modifier, it has a gel content in the range of from about 10 to about 80 weight percent.Type: GrantFiled: August 13, 1990Date of Patent: January 12, 1993Assignee: Copolymer Rubber & Chemical CorporationInventors: Charles F. Pratt, Shrikant V. Phadke, Errol Olivier
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Patent number: 5157164Abstract: This invention is addressed to antioxidants which are polymerizable using the Ziegler catalyst system. The antioxidant of the present invention has the formula: ##STR1## wherein R.sub.1 and R.sub.2 are each aryl groups containing a hindered antioxidant structure imparting antioxidant properties to the compounds. The compounds of the present invention are useful in the polymerization of olefin compounds using Ziegler catalyst systems whereby the antioxidant of the invention becomes chemically bound to the polymer while, at the same time, imparting antioxidant properties thereto.Type: GrantFiled: May 8, 1991Date of Patent: October 20, 1992Assignee: Copolymer Rubber & Chemical Corp.Inventor: Errol J. Olivier
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Patent number: 5098635Abstract: A process for coating wet rubber pellets including coating the pellets with an inorganic partitioning agent, a thickener and binder, and an anionic water soluble dispersant, air conveying the pellets to a dryer, and compressing the pellets to form a bale. By virtue of the coating, the bales are rendered more friable.Type: GrantFiled: November 9, 1989Date of Patent: March 24, 1992Assignee: Copolymer Rubber & Chemical CorporationInventor: Lincoln Widmer
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Patent number: 5075173Abstract: A polyolefin-EPDM or EPM thermoplastic blend in which the bonded relation of applied organic coatings is improved by the inclusion of an oxidized or carboxylated polyolefin.Type: GrantFiled: September 11, 1990Date of Patent: December 24, 1991Assignee: Copolymer Rubber & Chemical Corp.Inventors: Robert E. Benefield, Charles E. Boozer
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Patent number: 5075028Abstract: An accelerator composition and a rubber compounding composition in which a rubber is blended with a combination of three accelerators and sulfur for curing the rubber while minimizing the formation of iridescent sheen. The combination of accelerators included a thiolated morpholine, a dithiocarbamate and a benzothiazole.Type: GrantFiled: November 13, 1989Date of Patent: December 24, 1991Assignee: Copolymer Rubber & Chemical Corp.Inventor: John C. Hudson
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Patent number: 5017727Abstract: This invention is addressed to antioxidants which are polymerizable using the Ziegler catalyst system. The antioxidant of the present invention has the formula: ##STR1## wherein R.sub.1 and R.sub.2 are each aryl groups containing a hindered antioxidant structure imparting antioxidant properties to the compounds. The compounds of the present invention are useful in the polymerization of olefin compounds using Ziegler catalyst systems whereby the antioxidant of the invention becomes chemically bound to the polymer while, at the same time, imparting antioxidant properties thereto.Type: GrantFiled: July 10, 1990Date of Patent: May 21, 1991Assignee: Copolymer Rubber & Chemical CorporationInventor: Errol J. Olivier
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Patent number: 5015690Abstract: A modifier composition which provides retention of surface smoothness and internal appearance while imparting improved low-temperature impact properties to molded thermoplastics and the thermoplastic molding compositions containing said modifier, the modifier comprising a crystalline thermoplastic resin and a modifier formed by combining a grafted EPM or EPDM rubber and a reactive polystyrene.Type: GrantFiled: February 28, 1989Date of Patent: May 14, 1991Assignee: Copolymer Rubber & Chemical CorporationInventor: William G. Williams
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Patent number: 5003003Abstract: Novel thermoplastic elastomer compositions, made by dispersing a polyolefin elastomer phase containing functionalized EPM or EPDM in a polyamide resin followed by cross-linking of the elastomer phase, are described. The cross-linked phase exists as discreet particles, providing an overall blend which remains thermoplastic. The resulting blend may be used in the fabrication of elastomeric goods without the need for a separate vulcanization step after the desired object is formed.Type: GrantFiled: April 22, 1988Date of Patent: March 26, 1991Assignee: Copolymer Rubber & Chemical CorporationInventor: Errol J. Olivier
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Patent number: 4990568Abstract: A polyolefin-EPDM or EPM thermoplastic blend in which the bonded relation of applied organic coatings is improved by the inclusion of an oxidized or carboxylated polyolefin.Type: GrantFiled: March 7, 1989Date of Patent: February 5, 1991Assignee: Copolymer Rubber & Chemical CorporationInventors: Robert E. Benefield, Charles E. Boozer
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Patent number: 4977217Abstract: A polyester composition and method having improved unnotched Izod impact strength in which the polyester matrix is blended with an EPDM interpolymer grafted with an ester of acrylic or methacrylic acid and cross-linked with a diamine or diacid or its anhydride before or preferably after blending.Type: GrantFiled: July 1, 1988Date of Patent: December 11, 1990Assignee: Copolymer Rubber & Chemical CorporationInventors: Ronald H. Sunseri, Michael W. O'Rourke
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Patent number: 4956501Abstract: A polyester composition and method having improved unnotched Izod impact strength in which the polyester matrix is blended with an EPDM interpolymer grafted with an ester of acrylic or methacrylic acid and cross-linked with a diamine or diacid or its anhydride before or preferably after blending.Type: GrantFiled: October 19, 1988Date of Patent: September 11, 1990Assignee: Copolymer Rubber & Chemical CorporationInventors: Ronald H. Sunseri, Michael W. O'Rourke
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Patent number: 4948842Abstract: The improvement of toughness and impact strength of polyester resins is achieved by blending 60-90 parts by weight of the polyester with 10-40 parts by weight of an ethylene, propylene, diene rubber, having 2-20 unsaturated C.dbd.C linkages per 1000 carbon atoms and which has been grafted with glycidyl methacrylate to a level of 1-10 percent by weight.Type: GrantFiled: October 26, 1988Date of Patent: August 14, 1990Assignee: Copolymer Rubber and Chemical CorporationInventor: Errol J. Olivier
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Patent number: 4897447Abstract: A thermoplastic molding composition and modifier for improving the impact strength and toughness thereof in which the modifier is the combination of (1) an EPM or EPDM rubber grafted with an alpha-beta unsaturated dicarboxylic acid or anhydride or an epoxy functional alpha-beta ethylenically unsaturated hydrocarbon and (2) an epoxy acrylate oligomer of bisphenol A.Type: GrantFiled: December 28, 1987Date of Patent: January 30, 1990Assignee: Copolymer Rubber & Chemical Corp.Inventor: William G. Williams
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Patent number: 4757112Abstract: This invention is an improvement over the copending Olivier application Ser. No. 537,789, now U.S. Pat. No. 4,594,386, filed Sept. 30, 1983 and entitled "Polyamide Grafted EPM Blend". This invention relates to the further improvement in impact strength and toughness of polycaprolactams and other polyamide based resinous compositions and to a new and improved method for the manufacture of same.Type: GrantFiled: August 17, 1987Date of Patent: July 12, 1988Assignee: Copolymer Rubber & Chemical Corp.Inventor: Shrikant V. Phadke
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Patent number: 4670515Abstract: The peroxide catalyzed reaction of maleic anhydride and a saturated ethylene-propylene rubber of low molecular weight and the hydrolysis thereof produces a reversibly crosslinked product of apparent higher molecular weight by measure of Mooney viscosity but apparent unchanged molecular weight by reduced solution viscosity (RSV). The graft product of a low molecular weight semi-solid substrate can be recovered conveniently as a non-cold flowing solid which has utility as a low molecular weight oil VI improver and as an impact modifier for polar thermoplastic resins.Type: GrantFiled: August 1, 1985Date of Patent: June 2, 1987Assignee: Copolymer Rubber & Chemical Corp.Inventor: Errol J. Olivier
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Patent number: 4594386Abstract: Impact strength and toughness of polyamide resins are improved by blending resin with up to 50 percent by weight maleic anhydride grafted EPM rubber of low molecular weight and exposing the mixture to elevated temperature during blending.Type: GrantFiled: September 30, 1983Date of Patent: June 10, 1986Assignee: Copolymer Rubber & Chemical CorporationInventor: Errol J. Olivier
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Patent number: 4464493Abstract: A method and apparatus of taking a solid, high molecular weight EPM or EPDM polymer into solution in oil as a shear stable viscosity index improver comprising passing the polymer through an extruder at elevated temperature for degradation of the polymer and circulating hot oil across the die face of the extruder while reducing the degraded polymer to particle size upon issuance from the extruder and into the hot oil.Type: GrantFiled: September 13, 1982Date of Patent: August 7, 1984Assignee: Copolymer Rubber & Chemical Corp.Inventor: Ralph K. Joffrion
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Patent number: 4454304Abstract: The method of producing a rubber compound having high green strength comprising providing separate rubber components one of which contains a tertiary amine component bound therein and the other of which contains a halogen cross linking agent bound therein, and blending the two rubber components to form a rubber blend having high green strength.Type: GrantFiled: April 22, 1981Date of Patent: June 12, 1984Assignee: Copolymer Rubber & Chemical Corp.Inventor: Tom C. H. Tsai