Patents Represented by Attorney A. T. Bertolli
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Patent number: 4247336Abstract: A composition comprising sulfur, an aromatic polymeric polysulfide sulfur plasticizer, a mica filler, and a triarylphosphate has exceptional craze resistance when used as a coating formulation.Type: GrantFiled: February 21, 1979Date of Patent: January 27, 1981Assignee: Chevron Research CompanyInventor: Milutin Simic
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Patent number: 4233082Abstract: A composition comprising at least 50 weight percent sulfur, a sulfur plasticizer, and an aromatic polysulfide which is formed by reacting one mol of an aromatic carbocyclic or a heterocyclic compound, substituted by at least one functional group of the class --OH or --NHR in which R is H or lower alkyl, with at least two mols of sulfur. Preferred sulfur plasticizers are aliphatic linear polysulfides, and preferred aromatic polysulfides are formed using phenol. The composition typically also contains an inorganic filler such as mica or asbestos.The composition is especially useful for obtaining surface coatings which are resistant to delamination, cracking and crazing upon exposure to weather conditions.Type: GrantFiled: December 9, 1976Date of Patent: November 11, 1980Assignee: Chevron Research CompanyInventor: Milutin Simic
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Patent number: 4231943Abstract: A process for producing maleic anhydride from n-butane which comprises:(a) feeding n-butane and air to a reactor;(b) contacting the butane and air with a catalyst comprising vanadium and phosphorus oxides at reaction conditions including a temperature between 550.degree. F. and 1000.degree. F. so as to convert 15 to 28% of the butane per pass and obtain a reactor effluent containing maleic anhydride, unreacted butane, nitrogen, and oxygen;(c) removing maleic anhydride from the reactor effluent to obtain maleic anhydride-lean effluent;(d) recycling a portion of the maleic anhydride-lean effluent to the reactor;(e) removing butane from the other portion of the maleic anhydride-lean effluent; and(f) recycling the removed butane to the reactor.Preferably the temperature in, and/or space velocity through, the reactor is adjusted to obtain a weight percent selectivity to maleic anhydride of at least 90% of the butane converted.Type: GrantFiled: May 31, 1979Date of Patent: November 4, 1980Assignee: Chevron Research CompanyInventors: Stephen G. Paradis, David M. Marquis, Kiran R. Bakshi
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Patent number: 4228305Abstract: A process for preparing glycolic acid which comprises contacting formaldehyde with formic acid in the presence of hydrogen fluoride present in an amount to serve as both catalyst and solvent for the reactants and reaction mixture.Type: GrantFiled: May 7, 1979Date of Patent: October 14, 1980Assignee: Chevron Research CompanyInventor: Shigeto Suzuki
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Patent number: 4221921Abstract: A process for producing monochloroacetic acid from hydroxyacetic acid which comprises feeding hydroxyacetic acid and aqueous hydrogen chloride to a reaction zone and contacting the hydroxyacetic acid with the aqueous hydrogen chloride in the presence of hydrogen iodide catalyst at a temperature between 100.degree. and 250.degree. C. and a pressure sufficient to maintain the aqueous hydrogen chloride in liquid phase. Preferably the reaction is carried out at a temperature between about 130.degree. and 200.degree. C.Type: GrantFiled: May 10, 1978Date of Patent: September 9, 1980Assignee: Chevron Research CompanyInventor: Shigeto Suzuki
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Patent number: 4221605Abstract: Sulfur foam is produced by reacting molten sulfur with organic protonic acids to obtain an adduct and then reacting the adduct with a polyisocyanate to obtain a foam containing more than 50 weight percent sulfur. Before or after reacting the sulfur with the organic acid, or at the same time, the sulfur can be modified by reacting it with a sulfur-plasticizing material.Type: GrantFiled: January 16, 1976Date of Patent: September 9, 1980Assignee: Chevron Research CompanyInventor: Gar L. Woo
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Patent number: 4219364Abstract: A process for producing a sulfur foam containing at least 50 weight percent sulfur which comprises contacting and reacting molten sulfur with phenol or an aliphatic polysulfide to thereby obtain a phenol-sulfur adduct or an aliphatic polysulfide-sulfur adduct and contacting and reacting the adduct with maleic anhydride at a temperature between about 100.degree. and 190.degree. C. to thereby obtain a sulfur foam. In the case of phenol, preferably the phenol is reacted with the sulfur in the presence of a hydroxide base.Type: GrantFiled: December 13, 1978Date of Patent: August 26, 1980Assignee: Chevron Research CompanyInventor: Gar L. Woo
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Patent number: 4210458Abstract: A method of preparing a plasticized sulfur composition of increased viscosity as compared to a mixture of molten sulfur and remelted plasticized sulfur concentrate, which comprises including and mixing 0.01 to 5 weight percent of a C.sub.2 -C.sub.25 saturated polyhydric alcohol with the mixture. The concentrate used herein is obtained by combining sulfur and a sulfur plasticizer and then solidifying. Preferably the viscosity is increased sufficiently by the inclusion of the polyhydric alcohol so that the mixture of remelted concentrate and added sulfur will not give substantial sagging upon spraying onto a vertical wall in a thickness of about 1/16 inch.Type: GrantFiled: November 30, 1978Date of Patent: July 1, 1980Assignee: Chevron Research CompanyInventor: Militun Simic
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Patent number: 4199479Abstract: A catalyst composition having an intrinsic surface area above about 60 square meters per gram as measured by the BET nitrogen adsorption method, said catalyst comprising from about 1 to 30 weight percent of a finely divided silica component, and from about 1 to 99 weight percent of a hydrogenating component comprising copper in either elemental or compound form and zinc oxide.Type: GrantFiled: February 24, 1978Date of Patent: April 22, 1980Assignee: Chevron Research CompanyInventor: John B. Wilkes
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Patent number: 4189608Abstract: A process for preparing 3-butenoic acid which comprises contacting allyl alcohol with carbon monoxide and a palladium chloride catalyst at a temperature between about 50.degree. and 300.degree. C. and under superatmospheric pressure and wherein the reaction is carried out in a substantially anhydrous C.sub.2 -C.sub.10 carboxylic acid liquid solvent. Preferably the solvent is acetic acid.Type: GrantFiled: May 17, 1978Date of Patent: February 19, 1980Assignee: Chevron Research CompanyInventor: Victor P. Kurkov
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Patent number: 4188494Abstract: The concentration of hydrogen fluoride in crude glycolic acid made by the hydrogen fluoride-catalyzed reaction of formaldehyde and carbon monoxide can be reduced to less than about 1% by weight by removing the HF from the crude gylcolic acid by distillation or stripping with inert gas at a temperature above about 130.degree. C., thereby producing a polyglycolide subsequently convertible to glycolic acid by hydrolysis.Type: GrantFiled: August 7, 1978Date of Patent: February 12, 1980Assignee: Chevron Research CompanyInventor: Shigeto Suzuki
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Patent number: 4187235Abstract: A crystalline vanadium (IV) phosphate composition having an intrinsic surface area in excess of 10 square meters per gram is prepared by the reaction of orthophosphoric acid with a vanadium (IV) oxycompound. The vanadium compound is suspended in a suitable hydroxylic organic medium, for example isobutanol, and contacted with the acid at a temperature in the range 20.degree. C. to 210.degree. C. until the conversion is completed. The catalyst is used in the oxidation of n-butane to maleic anhydride.Type: GrantFiled: September 22, 1978Date of Patent: February 5, 1980Assignee: Chevron Research CompanyInventors: Kiyoshi Katsumoto, David M. Marquis
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Patent number: 4174366Abstract: Shaped concrete compositions can be pre-stressed to obtain improved flexural strength by embedding nylon-4 reinforcing bars in a wet-laid concrete prior to curing.Type: GrantFiled: June 29, 1978Date of Patent: November 13, 1979Assignee: Chevron Research CompanyInventor: Ronald A. Schneider
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Patent number: 4172211Abstract: A process for preparing thioethers of mercaptocarboxylic acids by contacting glycolic acid or bromoacetic acid and a mercaptan in the presence of aqueous hydrogen bromide.Type: GrantFiled: March 31, 1978Date of Patent: October 23, 1979Assignee: Chevron Research CompanyInventor: Shigeto Suzuki
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Patent number: 4169961Abstract: An alkenediol is produced from an alkenol by contacting the alkenol with formaldehyde at a pH maintained between about 4 and 7. Preferably this pH range is maintained by adding a buffering agent composed of a weak acid and the salt of a weak acid. Particularly advantageous buffering agents are the lower organic polycarboxylic acids with disodium or dipotassium hydrogen phosphate and sodium or potassium dihydrogen phosphate with disodium or dipotassium hydrogen phosphate.Type: GrantFiled: July 11, 1977Date of Patent: October 2, 1979Assignee: Chevron Research CompanyInventors: Robert G. Wall, John B. Wilkes, Shigeto Suzuki
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Patent number: 4166821Abstract: 1,4-Dioxan-2-ones are prepared by contacting carbon monoxide with formaldehyde, a 1,2-glycol, and a catalytic amount of hydrogen fluoride. The products of this reaction are readily converted into diglycolic acids by heating with aqueous caustic in the presence of a nickel catalyst.Type: GrantFiled: June 29, 1978Date of Patent: September 4, 1979Assignee: Chevron Research CompanyInventor: Shigeto Suzuki
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Patent number: 4165438Abstract: Acrylic acids and esters are produced by reacting a lower alkanoic acid or lower alkyl ester thereof with formaldehyde in the presence of a vanadium orthophosphate catalyst having an intrinsic surface area of from about 10 m.sup.2 /g to about 50 m.sup.2 /g.Type: GrantFiled: October 20, 1976Date of Patent: August 21, 1979Assignee: Chevron Research CompanyInventor: Ronald A. Schneider
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Patent number: 4164428Abstract: A plasticized sulfur composition having improved chemical resistance, comprising at least 50% by weight sulfur, a sulfur plasticizer, a mineral suspending agent, and an organosilane stabilizing agent.Type: GrantFiled: March 2, 1978Date of Patent: August 14, 1979Assignee: Chevron Research CompanyInventor: Milutin Simic
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Patent number: 4161612Abstract: A process for preparing thiodiglycolic acid comprises contacting bromoacetic acid, diglycolic acid or glycolic acid and hydrogen sulfide in the presence of aqueous hydrogen bromide.Type: GrantFiled: March 31, 1978Date of Patent: July 17, 1979Assignee: Chevron Research CompanyInventor: Shigeto Suzuki
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Patent number: 4156676Abstract: The thermal stability of hot melt adhesives comprising a polymer of glycolic acid is significantly improved by incorporating a minor amount of silica in the adhesive composition.Type: GrantFiled: March 27, 1978Date of Patent: May 29, 1979Assignee: Chevron Research CompanyInventor: Robert Bacskai