Halogen Containing Patents (Class 568/726)
-
Patent number: 5059726Abstract: A process for producing tetrabromobisphenol A, which comprises brominating bisphenol A in methanol, wherein the substrate concentration of bisphenol A to methanol is at most 20 wt/vol %.Type: GrantFiled: October 22, 1990Date of Patent: October 22, 1991Assignee: Tosoh CorporationInventors: Hisao Eguchi, Masashige Kubo, Koji Kunimoto, Sadami Shimizu, Masakatsu Sato, Hanzo Tamabayashi
-
Patent number: 5017728Abstract: Tetrabromobisphenol-A is made in high purity and increased yield by adding a methanol-bromine solution to a methanol bisphenol-A solution with vigorous agitation. The amount of methanol in the reaction vessel is adjusted to yield a ratio of tetrabromobisphenol-A to methanol when the reaction is substantially complete that provides a lower amount of Hbr impurity in the tetrabromobisphenol-A product. An increased recovery of tetrabromobisphenol-A product is achieved by adjusting the water added to the reaction vessel when the bromination reaction is essentially complete.Type: GrantFiled: August 20, 1990Date of Patent: May 21, 1991Assignee: Ethyl CorporationInventors: Bonnie G. McKinnie, Daniel A. Wood
-
Patent number: 4992151Abstract: Inorganic and organic hypohalites are used to obtain good selectivity to alpha halogenation of alkyl aromatic compounds. Alkali and alkaline earth hypohalites must be used in conjunction with a phase transfer medium. Useful organic hypohalites are the tertiary alkyl hypohalites, which are employed in the presence of free radical generating media such as light or compounds which produce free radicals thermally. At least one mole of hypohalite reactant must be used for every alpha hydrogen in the alkyl aromatic compound.A new bisphenol which contains biphenyl functionality has been made as well as an aromatic polyester derived therefrom.Type: GrantFiled: January 29, 1990Date of Patent: February 12, 1991Assignee: The Dow Chemical CompanyInventors: Marlin E. Walters, George M. St. George, W. Frank Richey
-
Patent number: 4990321Abstract: A method for recovering hydrobromic acid and methanol from a filtrate obtained by brominating bisphenol A in a methanol solvent and filtering off the resulting brominated bisphenol A, which comprises adding water to the filtrate, followed by distillation for purification.Type: GrantFiled: January 24, 1990Date of Patent: February 5, 1991Assignee: Tosoh CorporationInventors: Masakatsu Sato, Sadami Shimizu, Hanzo Tamabayashi
-
Patent number: 4960956Abstract: Ring-arylcyclobutenealkylated di(hydroxyphenyl) compounds having at least one arylcyclobutenealkyl moiety attached to at least one of the phenyl rings self-cure upon heating to produce rigid, relatively insoluble resins of the thermoset type.Type: GrantFiled: May 9, 1989Date of Patent: October 2, 1990Assignee: Shell Oil CompanyInventor: Pui-Kwan Wong
-
Patent number: 4783556Abstract: Tetrabromobisphenol-A is made in high purity by adding a methanol-bromine solution to a methanol-bisphenol-A solution with vigorous agitation. Use of the bromine-methanol solution reduces the amount of by-products compared to the use of liquid bromine feed to a methanol-bisphenol-A solution. The process is readily adapted to large scale equipment by circulating the reaction mixture from the reaction vessel through an external closed loop which includes an impingement mixer. The bromine-methanol feed is pumped at the proper rate and ratio into the impingement mixture whereby it impinges with the circulating reaction mixture. The resultant bromination mixture is then returned to the reaction vessel.Type: GrantFiled: November 27, 1987Date of Patent: November 8, 1988Assignee: Ethyl CorporationInventors: Olan W. Mitchell, Bonnie G. McKinnie
-
Patent number: 4745233Abstract: Antitumor compounds corresponding to the following formula: ##STR1## in which the substituents R.sub.1 and R.sub.2 may be the same or different and represent hydrogen, an aminocarbonyl group, a C.sub.1 -C.sub.6 alkylaminocarbonyl group, a di-C.sub.1 -C.sub.6 -alkylaminocarbonyl group, the group PO(OH).sub.2, a C.sub.2 -C.sub.8 alkanoyl group, a C.sub.2 -C.sub.8 halogen alkanoyl group or a C.sub.3 -C.sub.8 alkenoyl group, a process for their preparation, and their use in treating oestrogen-receptor-positive-tumors as well as the prostate carcinoma.Type: GrantFiled: June 9, 1986Date of Patent: May 17, 1988Assignee: Asta-Werke AktiengesellschaftInventors: Helmut Schonenberger, Rolf W. Hartmann, Martin Schneider, Walter Schwarz, Jurgen Engel
-
Patent number: 4705901Abstract: Prepare novel ring-brominated derivatives of tetraalkyl dihydroxy diaromatic compounds, e.g. 4,4'-(1,2-ethanediyl)bis(3,5-dibromo-2,6-dimethyl-phenol).Type: GrantFiled: August 26, 1986Date of Patent: November 10, 1987Assignee: The Dow Chemical CompanyInventor: Abel Mendoza
-
Patent number: 4701568Abstract: Tetrabromobisphenol-A is made in high purity by contacting a solution of bisphenol-A dissolved in a C.sub.1 -C.sub.4 alkanol with gaseous bromine.Type: GrantFiled: June 30, 1986Date of Patent: October 20, 1987Assignee: Ethyl CorporationInventors: Bonnie G. McKinnie, Olan W. Mitchell
-
Patent number: 4683345Abstract: Process of preparation of a bisphenol by the condensation of a phenol carrying a halogen substituent and alkyl groups with an aldehyde in a solvent for the phenol, in the presence of sulphuric acid; the proportion of acid with respect to the phenol is such that after the condensation and absorption by the acid of the water eliminated, the acid contains less than 50% of water by weight.Type: GrantFiled: April 16, 1986Date of Patent: July 28, 1987Assignee: Colette NouvelInventor: Guy Lejeune
-
Patent number: 4663434Abstract: Novel heat resistant polycarbonates are provided which are the polymerized reaction products of:(i) a carbonate precursor; and(ii) at least one dihydric phenol selected from dihydric phenols represented by the general formulae ##STR1## wherein: each R.sup.1 is independently selected from halogen radicals, monovalent hydrocarbon radicals, and monovalent hydrocarbonoxy radicals;each R.sup.2 is independently selected from halogen radicals, monovalent hydrocarbon radicals, and monovalent hydrocarbonoxy radicals;R.sup.4 and R.sup.5 are independently selected from monovalent hydrocarbon radicals;R.sup.3 is selected from hydrogen and monovalent hydrocarbon radicals, with the proviso that if R.sup.3 is a hydrogen radical than at least one of the monovalent hydrocarbon radicals represented by R.sup.4 and R.sup.5 contains at least two carbon atoms;R.sup.7 is selected from hydrogen and monovalent hydrocarbon radicals;R.sup.Type: GrantFiled: March 1, 1985Date of Patent: May 5, 1987Assignee: General Electric CompanyInventors: Victor Mark, Charles V. Hedges
-
Patent number: 4654447Abstract: Prepare 3,3',5-tribromo-2,2',6,6'-tetra(primary alkyl)-1,1'-biphenol in high yields by contacting a 3,3',5,5'-tetra-substituted diphenoquinone and a brominating agent under proper reaction conditions.Type: GrantFiled: February 20, 1986Date of Patent: March 31, 1987Assignee: The Dow Chemical CompanyInventor: Abel Mendoza
-
Patent number: 4628124Abstract: Tetrabromobisphenol-A is made in high purity by adding a methanol-bromine solution to a methanol-bisphenol-A solution with vigorous agitation. Use of the bromine-methanol solution reduces the amount of by-products compared to use of liquid bromine feed.Type: GrantFiled: September 23, 1985Date of Patent: December 9, 1986Assignee: Ethyl CorporationInventors: Bonnie G. McKinnie, Olan W. Mitchell
-
Patent number: 4621159Abstract: Prepare novel ring-brominated derivatives of tetraalkyl dihydroxy diaromatic compounds, e.g. 4,4'-(1,2-ethanediyl)bis(3,5-dibromo-2,6-dimethyl-phenol).Type: GrantFiled: September 9, 1985Date of Patent: November 4, 1986Assignee: The Dow Chemical CompanyInventor: Abel Mendoza
-
Patent number: 4612404Abstract: Polychlorinated biphenyls present as contaminants in fluids such as petroleum distillates are effectively removed by reacting with sodium or potassium hydroxide in the presence of or through subsequent filtration through an adsorbent such as alumina and/or diatomaceous earth. A mixture of diatomaceous earth, calcium hydroxide and potassium hydroxide in the ratio of 10/1/1 is exposed to the fluid to be decontaminated by stirring a quantity of the mixture in a quantity of the fluid or by passing the fluid through a column packed with the mixture. Alternatively, the contaminated fluid is mixed with the alkali metal hydroxide and then passed through a column of adsorbent such as activated basic alumina. The fluid may be pretreated by storing in a tank over a bed of potassium hydroxide flakes. Ferric oxide may be added to the reaction mixture to enhance the retention of the octachlorodihydroxybiphenyl on the adsorbent material.Type: GrantFiled: November 16, 1983Date of Patent: September 16, 1986Inventor: Budalur S. Thyagarajan
-
Patent number: 4564691Abstract: A process is provided for preparing a substituted 2,3-dihydrobenzofuran of the general formula ##STR1## in which R.sub.a is hydrogen, halogen, alkyl, straight or branched having from 1 to 4 carbon atoms, aryl, alkaryl, --OH, --OR.sub.3, --N(R.sub.d).sub.2, where R.sub.3 and R.sub.d are alkyl, straight or branched having from 1 to 4 carbon atoms; R.sub.b is alkyl, straight or branched, having from 1 to 6 carbon atoms, aryl, alkaryl; and R.sub.c is hydrogen or the same as R.sub.b, by the rearrangement of a 1,1-bis(2-hydroxybenzene) alkyl and/or aryl-ethane, in the presence of catalytic amounts of a mineral acid or organic acid such as phosphoric, sulfuric or p-toluenesulfonic, at elevated temperatures from 180.degree. to 250.degree. C., and withdrawing the resulting products from the reaction mixture as they are formed. The starting 1,1-bis(2-hydroxybenzene) alkyl and/or aryl-ethane compounds may be obtained by the catalyzed reaction of a substituted biphenol with an aldehyde.Type: GrantFiled: April 19, 1984Date of Patent: January 14, 1986Assignee: Enichimica Secondaria S.p.A.Inventors: Carlo Neri, Villiam Giroldini, Antonio Rinaldi, Mario Traversoni, Mario Clerici
-
Patent number: 4535191Abstract: Novel polycarbonates are provided which exhibit rubbery and elastomeric properties which are the polymerized reaction products of:(i) a carbonate precursor; and(ii) at least one dihydric phenol represented by the general formula ##STR1## wherein R is selected from straight chain alkyl radicals containing from 8 to about 30 carbon atoms;each R.sup.1 is independently selected from halogen monovalent hydrocarbon, and monovalent hydrocarbonoxy radicals;each R.sup.2 is independently selected from halogen, monovalent hydrocarbon, and monovalent hydrocarbonoxy radicals; andn and n' are independently selected from whole numbers having a value of from 0 to 4 inclusive.Type: GrantFiled: February 23, 1984Date of Patent: August 13, 1985Assignee: General Electric CompanyInventors: Victor Mark, Charles V. Hedges
-
Patent number: 4520187Abstract: Novel heat resistant polycarbonates are provided which are the polymerized reaction products of:(i) a carbonate precursor; and(ii) at least one dihydric phenol selected from dihydric phenols represented by the general formulae ##STR1## wherein: each R.sup.1 is independently selected from halogen radicals, monovalent hydrocarbon radicals, and monovalent hydrocarbonoxy radicals;each R.sup.2 is independently selected from halogen radicals, monovalent hydrocarbon radicals, and monovalent hydrocarbonoxy radicals;R.sup.4 and R.sup.5 are independently selected from monovalent hydrocarbon radicals;R.sup.3 is selected from hydrogen and monovalent hydrocarbon radicals, with the proviso that if R.sup.3 is a hydrogen radical than at least one of the monovalent hydrocarbon radicals represented by R.sup.4 and R.sup.5 contains at least two carbon atoms;R.sup.7 is selected from hydrogen and monovalent hydrocarbon radicals;R.sup.Type: GrantFiled: December 17, 1982Date of Patent: May 28, 1985Assignee: General Electric CompanyInventors: Victor Mark, Charles V. Hedges
-
Patent number: 4518808Abstract: Disclosed is a process for the preparation of certain dichloro-hydroxy and alkoxy aromatic compounds by reacting the corresponding unchlorinated compound with sulfuryl chloride in the presence of acetic acid, propionic acid or lower alkyl esters thereof.Type: GrantFiled: September 29, 1983Date of Patent: May 21, 1985Assignee: Eastman Kodak CompanyInventors: Richard H. S. Wang, Garry L. Myers
-
Patent number: 4467121Abstract: Fluorinated bisphenols having a fluorinated alkyl group and a hydrogen atom upon the methylene carbon atom are prepared at atmospheric pressure or at low pressures from a phenol reactant and a fluorinated aldehyde compound in the presence of gaseous hydrogen chloride or gaseous hydrogen bromide catalyst. The fluorinated bisphenols having the fluorinated alkyl group and a hydrogen atom upon the methylene carbon atom are produced in excellent yields and are used for making flame-retardant polycarbonates and polyester-carbonate copolymers.Type: GrantFiled: July 26, 1982Date of Patent: August 21, 1984Assignee: General Electric CompanyInventors: Victor Mark, Charles V. Hedges
-
Patent number: 4451675Abstract: The invention is a process for preparing alkylidenebis(dibromophenol) comprising(a) dissolving alkylidenediphenol in between about 17 and 25 moles of methanol for each mole of alkylidenediphenol wherein the methanol has less than 5 percent by weight of water therein;(b) adding to the solution between about 4.0 and 4.1 moles of bromine per mole of alkylidenediphenol at an elevated temperature;(c) adding water to precipitate the alkylidenebis(dibromophenol) remaining in solution after the addition of the bromine in step (b) is completed; and(d) separating the alkylidenebis(dibromophenol) from the methanol solution.Type: GrantFiled: July 16, 1982Date of Patent: May 29, 1984Assignee: The Dow Chemical CompanyInventor: Charles T. Bounds
-
Patent number: 4433132Abstract: A class of polyesters comprising recurring units having certain bis(trifluoromethyl)biphenylene radicals is disclosed. The polyesters exhibit favorable solubility properties in certain organic solvents so as to facilitate the production of the polyesters via polycondensation methods to film- and fiber-forming molecular weights. Monomeric compounds comprising a bis(trifluoromethyl)biphenylene radical and useful for the production of the polyesters are also disclosed.Type: GrantFiled: September 2, 1982Date of Patent: February 21, 1984Assignee: Polaroid CorporationInventors: Howard G. Rogers, Russell A. Gaudiana, Richard A. Minns
-
Patent number: 4431847Abstract: A process for forming a substantially insoluble solid polymer from halogeneated phenolic compounds dissolved in a liquid medium using an oxidizing agent. NaOCl and NaOBr are used as oxidizing agents to initiate the polymerization reaction among the halogenated phenolic compounds. The polymer precipitates from the system to form a claylike solid. The solid is environmentally safe and may be disposed of in a sanitary landfill.Type: GrantFiled: July 29, 1982Date of Patent: February 14, 1984Assignee: Ethyl CorporationInventors: Joseph A. Bossier, Julio J. Vega
-
Patent number: 4391996Abstract: A method is described for dehydrochlorinating 1,1,1-trichloro-2,2-bis(4-hydroxyphenyl)ethane employing a refluxing dipolar aprotic solvent, such as dimethylformamide, containing a lithium halide catalyst to produce a crystalline product consisting essentially of 1,1-dichloro-2,2-bis(4-hydroxyphenyl)ethylene. The crystalline product can be isolated in substantially pure form and converted to a high impact, flame retardant polycarbonate.Type: GrantFiled: November 16, 1981Date of Patent: July 5, 1983Assignee: General Electric CompanyInventors: Cleveland William K. S., Jimmy L. Webb, Charles M. Orlando
-
Patent number: 4365099Abstract: A method of improving the performance of cationic exchange catalysts used in the production of bisphenols from phenolic compounds and carbonyl compounds by pretreating the phenolic compound with a chelating resin to remove metallic impurities.Type: GrantFiled: May 12, 1981Date of Patent: December 21, 1982Assignee: General Electric CompanyInventors: Gary R. Faler, Ashok K. Mendiratta
-
Patent number: 4365098Abstract: Fluorinated bisphenols having a fluorinated alkyl group and a hydrogen atom upon the methylene carbon atom are prepared at atmospheric pressure or at low pressures from a phenol reactant and a fluorinated aldehyde compound in the presence of gaseous hydrogen chloride or gaseous hydrogen bromide catalyst. The fluroinated bisphenols having the fluorinated alkyl group and a hydrogen atom upon the methylene carbon atom are produced in excellent yields and are used for making flame-retardant polycarbonates and polyester-carbonate copolymers.Type: GrantFiled: December 31, 1980Date of Patent: December 21, 1982Assignee: General Electric CompanyInventors: Victor Mark, Charles V. Hedges
-
Patent number: 4358624Abstract: Phenol reactants and fluorinated aldehydes or fluorinated ketones are reacted in the presence of organic sulfonic acid catalysts to yield fluorinated monophenols and fluorinated diphenols. Fluorinated monophenols can be isolated and reacted with additional phenol reactant in the presence of organic sulfonic acid catalysts to yield asymmetrical, as well as symmetrical, fluorinated diphenols. A preferred organic sulfonic acid catalyst is methanesulfonic acid. The novel fluorinated monophenols have a hydroxy group and a fluorinated aryl radical or fluorinated alkyl radical substituted upon the benzylic carbon atom. The novel fluorinated diphenols have at least one fluorinated aryl radical or fluorinated alkyl radical substituted upon the methylene carbon atom of the bisphenol.Type: GrantFiled: December 31, 1980Date of Patent: November 9, 1982Assignee: General Electric CompanyInventors: Victor Mark, Charles V. Hedges
-
Patent number: 4354048Abstract: Carbon-to-carbon coupled self-condensation products are obtained by the oxidative coupling of substituted phenols in the presence of a heterogeneous dehydrogenation catalyst comprising copper chromite.Type: GrantFiled: May 22, 1981Date of Patent: October 12, 1982Assignee: The Dow Chemical CompanyInventor: Robert M. Strom
-
Patent number: 4354047Abstract: Carbon-to-carbon coupled self-condensation products are obtained by the oxidative coupling of substituted phenols in the presence of a heterogeneous dehydrogenation catalyst comprising nickel.Type: GrantFiled: May 22, 1981Date of Patent: October 12, 1982Assignee: The Dow Chemical CompanyInventor: Robert M. Strom
-
Patent number: 4329287Abstract: Halo-(carbonyldioxyaryl)ethylenes are prepared by a catalytic process which comprises contacting a halo-bis(hydroxyaryl)ethylene, carbon monoxide, an oxidant, a base, and a Group VIIIB element selected from ruthenium, rhodium, palladium, osmium, iridium or platinum. The resulting halo-(carbonyldioxyaryl)-ethylenes are useful as flame retardents for thermoplastic polymeric materials.Type: GrantFiled: December 3, 1980Date of Patent: May 11, 1982Assignee: General Electric CompanyInventor: Ronald L. Markezich
-
Patent number: 4310702Abstract: Sulfuryl chloride is reacted in the liquid phase with an organic reactant which is a ketone or aromatic alcohol unsubstituted on both ortho carbons in the presence of a moderator selected from the group consisting of aliphatic alcohols of 1-3 carbons and aliphatic ethers of 2-6 carbons, with sufficient moderator being present to selectively produce a product substantially free of compounds with more than one chlorine atom per carbonyl or aromatic hydroxy. The products, such as monochloroacetone, monochlorocyclohexanone, monochlorophenol and 2,2-bis(3-chloro-4-hydroxyphenyl)propane, are useful as chemical intermediates and as monomers for flame retardant polymers.Type: GrantFiled: July 28, 1980Date of Patent: January 12, 1982Assignee: Allied CorporationInventors: Divakaran Masilamani, Milorad M. Rogic
-
Patent number: 4291177Abstract: Highly pure dihalodiphenols or predetermined, statistical mixtures of unreacted, monohalo- and dihalodiphenols are obtained reacting the diphenol, which is suspended or dissolved in a suitable solvent, with a halogen while concurrently purging the reaction with a gas that is inert to the reaction.Type: GrantFiled: December 6, 1979Date of Patent: September 22, 1981Assignee: General Electric CompanyInventors: Victor Mark, Charles A. Wilson, II
-
Patent number: 4284830Abstract: Monohalogenated hydrocarbyl substituted phenols can be produced by reacting hydrocarbyl substituted phenols with a halogen carrying out the reaction in a diluent such as benzene, alkyl substituted benzenes, and halosubstituted hydrocarbons of 1-3 carbon atoms.Type: GrantFiled: February 1, 1980Date of Patent: August 18, 1981Assignee: Phillips Petroleum Co.Inventors: Ronald D. Knudsen, Darryl R. Fahey
-
Patent number: 4283566Abstract: An improved process for obtaining halogenated diphenols which can be pure dihalodiphenols or predetermined, statistical mixtures comprising unreacted diphenol, monohalodiphenols and dihalodiphenols.Type: GrantFiled: January 21, 1980Date of Patent: August 11, 1981Assignee: General Electric CompanyInventor: Victor Mark
-
Patent number: 4282391Abstract: A continuous process for obtaining highly pure, high molecular weight aromatic polycarbonates from highly pure, halogenated diphenols.Type: GrantFiled: December 10, 1979Date of Patent: August 4, 1981Assignee: General Electric CompanyInventors: Clayton B. Quinn, Charles A. Wilson, II
-
Patent number: 4275245Abstract: An improved process for obtaining halogenated diphenols which can be pure dihalodiphenols or predetermined, statistical mixtures comprising unreacted diphenol, monohalodiphenols and dihalodiphenols.Type: GrantFiled: July 16, 1979Date of Patent: June 23, 1981Assignee: General Electric CompanyInventor: Victor Mark
-
Patent number: 4261912Abstract: This invention describes novel antioxidant compounds which are esters of .omega.,.omega.-bis(dialkylhydroxyphenyl) alkanols having the formula: ##STR1## wherein R.sub.1 is a tertiary alkyl group having 4-8 carbon atoms;R.sub.2 is alkyl having 1-4 carbon atoms;R.sub.3 is a straight chain or branched alkylene group having 1-4 carbon atoms;x is 1-4,n is 1 or 2, and,Y is a group of the formulas ##STR2## when n is 1, where R.sub.4 is alkyl having from 12 to 24 carbon atoms, phenyl, or phenyl substituted with hydroxy of alkyl having 1 to 4 carbon atoms, or combinations thereof, or ##STR3## when n is 2, where R.sub.5 is a direct bond, a straight chain or branched alkylene having 1 to 8 carbon atoms, or a phenylene group, and m is 0 to 4.Type: GrantFiled: August 1, 1979Date of Patent: April 14, 1981Assignee: GAF CorporationInventor: David J. Tracy
-
Patent number: 4239918Abstract: Meta,para-substituted isopropylidene bisphenols are provided and methods for making such materials. Phenol, or substituted phenol is condensed with a meta-substituted isopropenyl phenol or a meta-hydroxy-.alpha.,.alpha.-dimethylbenzyl alcohol in the presence of an acid catalyst. The resulting meta,para-substituted isopropylidene bisphenols can be used as stabilizers for polyvinyl chloride resins and as intermediates for making high performance thermoplastics having chemically combined meta,para-isopropylidene diphenoxy units.Type: GrantFiled: December 6, 1978Date of Patent: December 16, 1980Assignee: General Electric CompanyInventor: Donald E. Keeley
-
Patent number: 4228308Abstract: 1,1,1-trichloro-2,2-bis(4-hydroxyphenyl)ethane can be dehydrohalogenated to 1,1-dichloro-2,2-bis(4-hydroxyphenyl) ethylene by treating the former with a dehydrochlorinating agent comprising liquid methyl amine and an effective amount of an additive to accelerate the dehydrochlorinating effect of the liquid methyl amine selected from the class consisting of a certain class of inorganic and organic salts.Type: GrantFiled: May 9, 1979Date of Patent: October 14, 1980Assignee: General Electric CompanyInventor: Michael R. Mac Laury
-
Patent number: 4223171Abstract: Improved flame retardance and improved water vapor transmission are imparted to high molecular weight aromatic polycarbonate resins by selecting appropriate diphenols and controlling the degree to which these particular diphenols are halogenated.Type: GrantFiled: June 18, 1979Date of Patent: September 16, 1980Assignee: General Electric CompanyInventors: Victor Mark, Charles V. Hedges
-
Patent number: 4221893Abstract: According to the present invention there are provided novel flame retardant brominated bisphenol epoxy compositions comprising the reaction product of the residue of the production of tetrabromo-bisphenol A (TBBA) with epichlorohydrin, and a process for the production of such compositions which comprises dissolving such residue in an excess of aqueous alkali, reacting the residue with epichlorohydrin at elevated temperature, neutralizing excess of alkali remaining after the reaction and recovering the brominated epoxy compositions.The compositions thus obtained are useful as flame retardants. There may be optionally incorporated in same compounds such as antimony trioxide.Type: GrantFiled: December 20, 1978Date of Patent: September 9, 1980Assignee: Makhteshim Chemical Works LimitedInventors: Meir Behar, Ori Peshes, Aharon Liebersohn
-
Patent number: 4221901Abstract: A method is described for dehydrochlorinating 1,1,1-trichloro-2,2-bis(4-hydroxyphenyl)ethane employing a refluxing dipolar aprotic solvent, such as dimethylformamide, containing a lithium halide catalyst to produce a crystalline product consisting essentially of 1,1-dichloro-2,2-bis(4-hydroxyphenyl)ethylene. The crystalline product can be isolated in substantially pure form and converted to a high impact, flame retardant polycarbonate.Type: GrantFiled: June 27, 1978Date of Patent: September 9, 1980Assignee: General Electric CompanyInventors: William K. S. Cleveland, Jimmy L. Webb, Charles M. Orlando
-
Patent number: 4210765Abstract: An improved process for obtaining halogenated diphenols which can be pure dihalodiphenols or predetermined, statistical mixtures comprising unreacted diphenol, monohalodiphenols and dihalodiphenols.Type: GrantFiled: February 28, 1978Date of Patent: July 1, 1980Assignee: General Electric CompanyInventor: Victor Mark
-
Patent number: 4192956Abstract: The action of liquid ammonia in dehydrohalogenating 1,1,1-trichloro-2,2-bis(4-hydroxyphenyl)ethane to 1,1-dichloro-2,2-bis(4-hydroxyphenyl)ethylene by liquid ammonia can be accelerated by incorporating in the liquid ammonia an effective amount of a certain class of inorganic salts.Type: GrantFiled: February 12, 1979Date of Patent: March 11, 1980Assignee: General Electric CompanyInventor: Michael R. MacLaury
-
Patent number: 4192957Abstract: The action of liquid ammonia in dehydrohalogenating 1,1,1-trichloro-2,2-bis(4-hydroxyphenyl)ethane to 1,1-dichloro-2,2-bis(4-hydroxyphenyl)ethylene by liquid ammonia can be accelerated by incorporating in the liquid ammonia an effective amount of a certain class of alkyl amine hydrohalides.Type: GrantFiled: February 12, 1979Date of Patent: March 11, 1980Assignee: General Electric CompanyInventor: Michael R. MacLaury
-
Patent number: 4191843Abstract: A process for the preparation of bisphenols is described which comprises reacting, in a reaction zone, at least 2 moles of a phenol with a carbonyl compound, at a temperature of from 40.degree. to 95.degree. C., in the presence of an acid ion exchanger, optionally partially modified with a compound having an acidic reacting group and a mercaptan group, and recovering the bisphenols from the reaction zone effluent, characterized in that the reaction zone effluent is contacted with an acid ion exchanger in metal salt form and/or a weak base ion exchanger. As a result, it has been found that the formation of undesirable compounds is substantially reduced.Type: GrantFiled: November 7, 1978Date of Patent: March 4, 1980Assignee: Shell Oil CompanyInventors: Arien Kwantes, Pieter A. Gautier
-
Patent number: 4182838Abstract: Improved flame retardance and improved water vapor transmission are imparted to high molecular weight aromatic polycarbonate resins by selecting appropriate diphenols and controlling the degree to which these particular diphenols are halogenated.Type: GrantFiled: February 28, 1978Date of Patent: January 8, 1980Assignee: General Electric CompanyInventors: Victor Mark, Charles V. Hedges
-
Patent number: 4180684Abstract: 4,4'-isopropylidene-bis(2,6-dibromophenol) is produced by reacting 4,4'-isopropylidene diphenol with hydrogen bromide or a mixture of hydrogen bromide with up to an equimolar amount of free bromine in admixture with hydrogen peroxide and in the presence of water and an inert organic liquid.Type: GrantFiled: January 14, 1977Date of Patent: December 25, 1979Assignee: Deutsche Gold- und Silber-Scheideanstalt vormals RoesslerInventors: Peter Kleinschmit, Eberhard Walter, Helmut Mechler, Gunter Theis, Brigitte Meiners
-
Patent number: 4180685Abstract: 1,1,1-trichloro-2,2-bis(4-hydroxyphenyl)ethane can be dehydrohalogenated to 1,1-dichloro-2,2-bis(4-hydroxyphenyl) ethylene by treating the former with a dehydrochlorinating agent consisting of liquid methyl amine.Type: GrantFiled: January 17, 1979Date of Patent: December 25, 1979Assignee: General Electric CompanyInventor: Michael R. MacLaury
-
Patent number: 4156790Abstract: Isomerization of an ortho, para-isomer of a dihydroxydiphenyl chloroethylene compound to the corresponding para, para-isomer can be effected by treatment of the former with trifluoromethanesulfonic acid in the presence of phenol.Type: GrantFiled: April 10, 1978Date of Patent: May 29, 1979Assignee: General Electric CompanyInventor: John R. Campbell