Polymerizing In The Presence Of A Specified Material Other Than A Reactant Patents (Class 528/371)
-
Patent number: 6153672Abstract: A process for preparing a tris-lactam crosslinking agent, tris-pyrrolidonyl triazine, from N,N',N"-tris(4-chlorobutyryl)melamine by treatment of the chlorobutyryl derivative with a base such as sodium or potassium carbonate to effect intramolecular cyclization to the tris-lactam. A curable composition comprised of tris-pyrrolidonyl triazine as the crosslinking agent and a hydroxyfunctional or aminofunctional material as a resin. Thick films with no pinholes are prepared from the curable compositions using powder coating techniques.Type: GrantFiled: January 7, 1993Date of Patent: November 28, 2000Assignee: Cytec Technology Corp.Inventors: Ram B. Gupta, Robert G. Lees
-
Patent number: 6107369Abstract: A process for preparing a tris-lactam crosslinking agent, tris-pyrrolidonyl triazine, from N,N',N"-tris(4-chlorobutyryl)melamine by treatment of the chlorobutyryl derivative with a base such as sodium or potassium carbonate to effect intramolecular cyclization to the tris-lactam. A curable composition comprised of tris-pyrrolidonyl triazine as the crosslinking agent and a hydroxyfunctional or aminofunctinoal material as a resin. Thick films with no pinholes are prepared from the curable compositions using powder coating techniques.Type: GrantFiled: June 6, 1995Date of Patent: August 22, 2000Assignee: Cytec Technology Corp.Inventors: R. B. Gupta, Robert G. Lees
-
Patent number: 6106918Abstract: Bischloroformate oligomer compositions are prepared by passing phosgene into a heterogeneous aqueous-organic mixture containing at least one dihydroxyaromatic compound, with simultaneous introduction of a base at a rate to maintain a specific pH range and to produce a specific volume ratio of aqueous to organic phase. By this method, it is possible to employ a minimum amount of phosgene. The reaction may be conducted batchwise or continuously. The bischloroformate composition may be employed for the preparation of cyclic polycarbonate oligomers or linear polycarbonate, and linear polycarbonate formation may be integrated with bischloroformate composition formation in a batch or continuous process.Type: GrantFiled: July 11, 1995Date of Patent: August 22, 2000Assignee: General Electric CompanyInventors: James Manio Silva, Robert Allen Pyles
-
Patent number: 6037436Abstract: The invention relates to a method for preparing a polycarbonate, by mixing (i) 2,2,4,4-tetramethyl-1,3-cyclobutanediol, (ii) dimethyl carbonate, and (iii) a basic catalyst, and heating components (i)-(iii) to produce an intermediate, followed by heating the intermediate at a temperature of less than or equal to 300.degree. C. to produce the polycarbonate. The invention further relates to the polycarbonates produced by the methods of the present invention.Type: GrantFiled: December 23, 1997Date of Patent: March 14, 2000Assignee: Eastman Chemical CompanyInventors: Theodore R. Walker, William R. Darnell, Jean C. Fleischer
-
Patent number: 5977262Abstract: The reactions of cyclic carbonates, especially 1,3-dioxolan-2-ones, with amines, especially primary amines, are catalyzed by the presence of a base whose conjugate acid has a pKa of about 11 or more. The products are hydroxy urethanes, and the process can be used to form crosslinked polymers which contain urethane groups. Such crosslinked polymers are useful in coatings.Type: GrantFiled: May 8, 1997Date of Patent: November 2, 1999Assignee: E. I. du Pont de Nemours and CompanyInventor: Albert Gordon Anderson
-
Patent number: 5973033Abstract: Compounds containing two cyclic hydrocarbon moieties which are substituted to provide crosslinking functionality and which are linked to each other by secondary or tertiary oxycarbonyl containing moiety are basis for compositions which are cured to provide cured thermosets for encapsulation and underfill for electronic components that are thermally decomposable to allow repair, replacement, recovery or recycling of operative electronic components from assemblies that are inoperative.Type: GrantFiled: October 26, 1998Date of Patent: October 26, 1999Assignee: Cornell Research Foundation, Inc.Inventors: Christopher K. Ober, Hilmar Koerner
-
Patent number: 5969081Abstract: Disclosed herein are cyclic oligomers comprising substituted or unsubstituted m-phenylene isophthalamide, complexes of these oligomers with selected metal salts, novel methods for their preparation, and polymerization of the cyclic oligomers to linear aramids. The aramids are useful, for example, as fibers for fire resistant clothing. Amino-functional cyclic oligomers may be reacted with polyfunctional acyl halides to produce polyamides.Type: GrantFiled: March 6, 1998Date of Patent: October 19, 1999Assignee: E. I. du Pont de Nemours and CompanyInventors: Young Hwan Kim, Wesley Memeger, Jr.
-
Patent number: 5945464Abstract: The ultraviolet-curable, resin-forming composition which comprises a polycarbonic acid ester such as diethylene glycol bis(allyl carbonate), a polythiol such as pentaerythritol tetrakis(3-mercaptopropionate) and an ultraviolet curing agent. The resin-forming composition can be photopolymerized in an atmospheric condition, and the thus produced resin has an elongated durability as well as excellent properties with regard to a transparency, heat resistance, adhesion property, resistance to shock, dyeing property and others.Type: GrantFiled: August 13, 1997Date of Patent: August 31, 1999Assignee: Asahi Kogaku Kogyo Kabushiki KaishaInventors: Hidenori Takushima, Kouji Futaki
-
Patent number: 5910548Abstract: The process for producing a modified epoxy resin comprises reacting (a) an epoxy resin having at least two epoxy groups per one molecule, and (b) a specific active ester group-containing compound having at least two aromatic ring-bonded active ester groups per one molecule, in proportions such that the amount of the active ester groups in the active ester group-containing compound is from about 0.05 to about 0.95 mol per mole of the epoxy group in the epoxy resin, and the modified epoxy obtained by this process, and a composition of the epoxy resin and a curing agent are encompassed.Type: GrantFiled: July 22, 1997Date of Patent: June 8, 1999Assignee: Shell Oil CompanyInventors: Yasuyuki Murata, Norio Tohriiwa, Yoshinori Nakanishi
-
Patent number: 5770675Abstract: Disclosed herein are cyclic oligomers comprising substituted or unsubstituted m-phenylene isophthalamide, complexes of these oligomers with selected metal salts, novel methods for their preparation, and polymerization of the cyclic oligomers to linear aramids. The aramids are useful, for example, as fibers for fire resistant clothing. Amino-finctional cyclic oligomers may be reacted with polyfunctional acyl halides to produce polyamides.Type: GrantFiled: June 18, 1996Date of Patent: June 23, 1998Assignee: E. I. du Pont de Nemours and CompanyInventors: Young Hwan Kim, Wesley Memeger, Jr.
-
Patent number: 5756781Abstract: An improved method for the preparation of tris(4-hydroxyphenyl) compounds is provided. In particular, an improved method for preparing 1, 1,1-tris(4'-hydroxyphenyl)ethane is provided which comprises heating a mixture comprising phenol and 4-hydroxy acetophenone in the presence of effective amounts of an ion exchange catalyst and a mercaptan as a copromoter such that the resulting 1,1,1-tris(4'-hydroxyphenyl)ethane is substantially free of various reaction impurities.Type: GrantFiled: September 29, 1995Date of Patent: May 26, 1998Assignee: General Electric CompanyInventors: Paul Dean Sybert, Gaylord Michael Kissinger, Ashok Kumar Mendiratta
-
Patent number: 5723562Abstract: Novel functionalized peroxides which may be used as crosslinking, grafting and curing agents, initiators for polymerization reactions and as monomers for condensation polymerizations to form peroxy-containing polymers, which in turn can be used to prepare block and graft copolymers, have the following Formula I: ##STR1## R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7, X, Y.sup.1, Y.sup.2, Y.sup.3, Z.sup.1, Z.sup.2, x, y and z are as defined in the Summary of the Invention. The compounds of Formula I may be prepared by reacting hydroxy-containing tertiary hydroperoxides with diacid halides, phosgene, dichloroformates, diisocyanates, anhydrides and lactones to form the functionalized peroxides. These reaction products may be further reacted, if desired, with dialcohols, diamines, aminoalcohols, epoxides, epoxy alcohols, epoxy amines, diacid halides, dichloroformates and diisocyanates to form additional functionalized peroxides.Type: GrantFiled: December 5, 1996Date of Patent: March 3, 1998Assignee: Elf Atochem North America, Inc.Inventor: Daryl L. Stein
-
Patent number: 5719259Abstract: Perfluoroalkylene oxide copolymer having acid fluoride moieties are prepared by reaction of hexafluoropropylene oxide and 1,2-epoxypentafluoropropane 3-fluorosulfate in the presence of a cesium alkoxide initiator. The copolymers may be cured at room temperature and are useful in sealant and coating formulations. Derivatives of the copolymers containing ester, amide, nitrile, and ether moieties are also disclosed.Type: GrantFiled: August 12, 1996Date of Patent: February 17, 1998Assignee: E. I. du Pont de Nemours and CompanyInventors: Galina Mikhailovna Tyul'ga, Olga Borisovna Platonova, Irina Gennadievna Solodkaya, Dimetrii Stefanovich Rondarev, Yurii Kalmanovich Starobin, Sergey Vasilievich Sokolov, Albertus VanCleeff
-
Patent number: 5637655Abstract: A process is disclosed whereby a polymeric resin (containing ester and/or carbonate bonds) is readily converted into a resin having a modified molecular structure. Accordingly, a cyclic carbonate (a monomer or oligomer) is transesterified with the polymer resin in the melt, preferably upon extrusion, optionally in the presence of a catalyst. Significantly, the cyclic carbonate which may include any of a variety of functional groups may, by the inventive process, be inserted into the structure of the polymer, effecting a modification to the structure and the properties of the resin. Among the disclosed beneficial modifications thus imparted to the resin are improved thermal stability, altered rheology and optical properties.Type: GrantFiled: July 2, 1996Date of Patent: June 10, 1997Assignee: Bayer CorporationInventors: Duane B. Priddy, Jr., Robert J. Kumpf
-
Patent number: 5637664Abstract: Polymeric, catalytically-active compounds having imidazole groups linked terminally and/or laterally to the polymer chain through reactive groups on the polymer chain are disclosed. The polymer chain is selected from the group consisting of polyether ketones; acidic, basic, or neutral ion exchange resins; polymeric isocyanates; polymers or copolymers containing maleic acid or maleic anhydride; and polymers containing benzyl halide groups.Type: GrantFiled: June 1, 1995Date of Patent: June 10, 1997Assignee: BASF AktiengesellschaftInventors: Bernd Bruchmann, Roland Minges, Christian Schade, Konrad Stiefenhoefer
-
Patent number: 5633342Abstract: A method is provided for the synthesis of environmentally degradable block copolymers which includes the sequential polymerization of polymer-forming materials in the presence of one or more polymerization reaction accelerants and catalysts. The accelerants are a class of hydrogen-labile compounds which act as polymerization initiators and accelerate the polymerization rate significantly. The environmentally degradable block copolymers produced include those comprising segments of polymers of alkylene oxides, trimethylene carbonates, lactones and cyclic esters of hydroxycarboxylic acids.Type: GrantFiled: October 27, 1995Date of Patent: May 27, 1997Assignee: Chronopol, Inc.Inventors: Dan W. Verser, Kevin H. Schilling, Xiaomao Chen
-
Patent number: 5623026Abstract: Siloxanes containing epoxy groups having the formula 1 ##STR1## Formula 1 whereinA means a C.sub.1 -C.sub.20 alkyl radical with epoxy groupsB means R.sup.1 or AR.sup.1, R.sup.2 independently of each other, means C.sub.1 -C.sub.20 alkyl or C.sub.6 -C.sub.10 aryla means zero or a whole number from 1-100b means zero or a whole number from 1-100c means a whole number from 1-5.Type: GrantFiled: December 28, 1995Date of Patent: April 22, 1997Assignee: Bayer AktiengesellschaftInventors: Josef Buekers, Peter Bier, Sabine Schlitte, Hubertus Eversheim, Helmut-Martin Meier
-
Patent number: 5597887Abstract: Blow moldable polycarbonate is produced by first producing a polycarbonate preform by a melt transesterification process. The polycarbonate preform comprises 2.1 to 10 mole percent polyfunctional branching agent, based on the total moles of polycarbonate in the polycarbonate preform. The polycarbonate preform is then melt equilibrated with a second polycarbonate to produce a blow moldable grade.Type: GrantFiled: August 9, 1995Date of Patent: January 28, 1997Assignee: General Electric CompanyInventors: Joseph A. King, Jr., Patrick J. McCloskey, Alice M. Colley, David M. Dardaris
-
Patent number: 5580951Abstract: Bischloroformate oligomer compositions are prepared by passing phosgene into a heterogeneous aqueous-organic mixture containing at least one dihydroxyaromatic compound, with simultaneous introduction of a base at a rate to maintain a specific pH range and to produce a specific volume ratio of aqueous to organic phase. By this method, it is possible to employ a minimum amount of phosgene. The reaction may be conducted batchwise or continuously. The bischloroformate composition may be employed for the preparation of cyclic polycarbonate oligomers or linear polycarbonate, and linear polycarbonate formation may be integrated with bischloroformate composition formation in a batch or continuous process.Type: GrantFiled: August 25, 1994Date of Patent: December 3, 1996Assignee: General Electric CompanyInventors: James M. Silva, Robert A. Pyles
-
Patent number: 5527879Abstract: Disclosed is a coating composition comprising:(1) a polycarbonate polyol having an average molecular weight of 400-10,000 and a hydroxyl value of 50-350, and(2) a melamine resin curing agent, wherein polyhydric alcohols constituting said polycarbonate polyol comprises at least 10 mol % of branched diols, at least 10 mol % of tri- or higher-hydric alcohols and the balance of the other polyhydric alcohols, and a ratio of component (1) / component (2) is within the range of 90/10-50/50 based on solid weight.Type: GrantFiled: March 24, 1993Date of Patent: June 18, 1996Assignee: Nippon Paint Co., Ltd.Inventors: Yasuhiko Nakae, Hisaki Tanabe, Tadahiko Nishi, Yoshio Eguchi
-
Patent number: 5508379Abstract: Polyester polymers having pendant carbamate groups are disclosed. The polymers are prepared by reacting:(a) reacting a hydroxyalkyl cyclic carbonate compound with a compound having at least one cyclic anhydride group to form a half-ester acid comprising a cyclic carbonate group,(b) reacting the cyclic carbonate group on the half-ester from step (a) with ammonia, ammonium hydroxide, or a primary amine to ring open the cyclic carbonate and form a compound comprising an acid group, a hydroxyl group, and a pendant carbamate group, and(c) reacting a mixture comprising the compound from step (b) and optionally comprising a polyol or a polyacid or both to form the polyester having pendant carbamate groups.Type: GrantFiled: December 21, 1994Date of Patent: April 16, 1996Assignee: BASF CorporationInventors: Gregory L. Menovcik, Walter H. Ohrbom
-
Patent number: 5494997Abstract: A process for preparing a polyestercarbonate copolymer which is nearly devoid of diaryl-carbonates and that exhibits a glass transition temperature lower than bisphenol-A carbonate homopolymer, and that shows improved processability is herein described. The desired lower Tg and improved flow can be achieved by the polycondensation of a dihydric phenol and aliphatic dicarboxylic acid. The condensate is polymerized with a carbonate forming reagent.Type: GrantFiled: August 1, 1994Date of Patent: February 27, 1996Assignee: General Electric CompanyInventors: Luca P. Fontana, Paul W. Buckley, Eugene Boden
-
Patent number: 5488089Abstract: A curable resin composition, which is not thickened nor gels during storage, can be high solids, cures even at low temperatures and is excellent in electrostatic coating properties, and which contains as main components, a polymer having in one molecule epoxy group(s), and functional group(s) in each of which a carbonate ester group (--O--CO--O--) is directly bound to an aromatic ring; or a mixture of a compound having in one molecule at least two epoxy groups and a compound having in one molecule at least two functional groups in each of which a carbonate ester group (--O--CO--O--) is directly bound to an aromatic ring, and a curing reaction catalyst.Type: GrantFiled: October 17, 1994Date of Patent: January 30, 1996Assignee: Kansai Paint Co., Ltd.Inventors: Koji Yamada, Motoshi Yabuta
-
Patent number: 5486593Abstract: This invention relates to medical devices formed totally or in part from homopolymers or copolymers comprising recurring carbonate moieties.Type: GrantFiled: September 23, 1994Date of Patent: January 23, 1996Assignee: United States Surgical CorporationInventors: Regianld T. Tang, Frank Mares, William J. Boyle, Jr., Tin-Ho Chiu, Kundanbhai M. Patel
-
Patent number: 5476974Abstract: Normally liquid, omega-hydrofluoroalkyl ether compounds (and selected mixtures thereof) have a saturated perfluoroaliphatic chain of carbon atoms interrupted by one or more ether oxygen atoms. The compounds can be prepared, e.g., by decarboxylation of the corresponding fluoroalkyl ether carboxylic acids and are useful, e.g., in cleaning and drying applications.Type: GrantFiled: May 20, 1994Date of Patent: December 19, 1995Assignee: Minnesota Mining and Manufacturing CompanyInventors: George G. I. Moore, Miguel A. Guerra
-
Patent number: 5466744Abstract: Macrocyclic polyester oligomer compositions comprising alkylene isophthalate or terephthalate units or the like are prepared by the reaction of a diol with a diacid chloride in the presence of at least one amine characterized by substantially no steric hindrance around the basic nitrogen atom. The reaction is conducted under substantially anhydrous conditions and at a temperature from about -25.degree. to about +25.degree. C. The resulting macrocyclic oligomers may be converted to linear polyesters by contact with catalysts including basic reagents, stannous alkoxides, organotin compounds, titanate esters and metal acetylacetonates.Type: GrantFiled: January 9, 1995Date of Patent: November 14, 1995Assignee: General Electric CompanyInventors: Thomas L. Evans, Daniel J. Brunelle, Jean E. Bradt, Eric J. Pearce, Paul R. Wilson
-
Patent number: 5464930Abstract: Bischloroformate oligomer compositions are prepared by passing phosgene into a heterogeneous aqueous-organic mixture containing at least one dihydroxyaromatic compound, with simultaneous introduction of a base at a rate to maintain a specific pH range and to produce a specific volume ratio of aqueous to organic phase. By this method, it is possible to employ a minimum amount of phosgene. The reaction may be conducted batchwise or continuously. The bischloroformate composition may be employed for the preparation of cyclic polycarbonate oligomers or linear polycarbonate, and linear polycarbonate formation may be integrated with bischloroformate composition formation in a batch or continuous process.Type: GrantFiled: April 5, 1990Date of Patent: November 7, 1995Assignee: General Electric CompanyInventors: James M. Silva, Robert A. Pyles
-
Patent number: 5459226Abstract: The present invention is directed to a method for effecting the redistribution of polycarbonate and polycarbonate blends utilizing a tetraorganophosphonium carboxylate salt.Type: GrantFiled: July 27, 1994Date of Patent: October 17, 1995Assignee: General Electric CompanyInventors: Joseph A. King, Jr., Patrick J. McCloskey, David M. Dardaris
-
Patent number: 5426170Abstract: 1. A method for preparing an aromatic polycarbonate having less content of a low molecular weight oligomer which comprises the steps of:(A) conducting an interfacial polymerization reaction in a reaction system comprising at least one aromatic dihydroxy compound, a carbonate precursor, an alkali metal or alkaline earth metal base, water and an organic solvent in the absence of an endcapping agent, and(B) conducting an interfacial polymerization reaction with the addition of an endcapping agent after at least one of the following parameters reaches a predetermined value:(1) a weight-average molecular weight of a prepolymer obtained in step A,(2) a residual amount of the aromatic dihydroxy compound which is contained in the reaction mixture obtained in step A,(3) an amount ratio of a bishaloformate compound to a prepolymer wherein the bishaloformate compound is a bishaloformate derivative of a dihydroxy compound and is contained in the reaction mixture obtained in step A.Type: GrantFiled: November 29, 1993Date of Patent: June 20, 1995Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Motokazu Hirao, Yoshiyuki Totani, Tomonori Ito, Masakatsu Nakatsuka, Akihiro Yamaguchi
-
Patent number: 5399658Abstract: A gamma radiation-resistant polycarbonate-disulfide resin is disclosed. The incorporation of disulfide linkages in the structure of polycarbonate was found to enhance the resistance of the resin to the discoloration caused by exposure to gamma radiation. Accordingly, processes for the incorporation of disulfide linkages in the molecular backbone, as end-groups or as side chains are disclosed. The polycarbonate-disulfide resin may be used as a molding resin in the context of thermoplastic molding compositions as well as a stabilizing additive in polycarbonate resin.Type: GrantFiled: October 29, 1993Date of Patent: March 21, 1995Assignee: Miles Inc.Inventors: Rick L. Archey, Robert J. Kumpf, Aaron D. Meltzer, Harald Pielartzik
-
Patent number: 5393855Abstract: A thermosetting resin composition which comprises (A-2) a vinyl polymer having at least one each of 2-oxo-1,3-dioxolan-4-yl group and a carboxyl group together on the polymer and a catalyst (B) effective for ring-opening the 2-oxo-1,3-dioxolan-4-yl group and curing said vinyl polymer, and related resin compositions.Type: GrantFiled: June 23, 1994Date of Patent: February 28, 1995Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Goro Iwamura, Hiroshi Kinoshita, Asako Kometani
-
Patent number: 5374699Abstract: A thermosetting resin composition which comprises (A-2) a vinyl polymer having at least one each of 2-oxo-1,3-dioxolan-4-yl group and a carboxyl group together on the polymer and a catalyst (B) effective for ring-opening the 2-oxo-1,3-dioxolan-4-yl group and curing said vinyl polymer, and related resin compositions.Type: GrantFiled: February 7, 1994Date of Patent: December 20, 1994Assignee: Dainipponink and Chemicals, Inc.Inventors: Goro Iwamura, Hiroshi Kinoshita, Asako Kometani
-
Patent number: 5362839Abstract: A process for preparing polycarbonate wherein a chain terminator is added to the reaction mixture after substantial reaction of a carbonate precursor, a coupling catalyst is added to the reaction mixture after substantial reaction of the chain terminator, and base is added to the reaction mixture after reaction mixture after substantial reaction of the chain terminatorin an amount sufficient to give a negative chloroformate test.Type: GrantFiled: February 16, 1994Date of Patent: November 8, 1994Assignee: The Dow Chemical CompanyInventors: Sarat Munjal, Thomas M. Wardlow, Andrew F. Hall
-
Patent number: 5362841Abstract: A process for preparing halogenated polycarbonate wherein the total amount of base the end pH of the aqueous phaser and the amount of coupling catalyst employed in the reaction are controlled to selected levels.Type: GrantFiled: May 17, 1993Date of Patent: November 8, 1994Assignee: The Dow Chemical CompanyInventors: Sarat Munjal, Clark J. Cummings, Che-I Kao
-
Patent number: 5360889Abstract: A soft polycarbonate resin represented by formula (I): ##STR1## wherein A represents a polyether block consisting essentially of a structural unit represented by formula (II):--CH.sub.2 --CH.sub.2 --CH.sub.2 --CH.sub.2 --O-- (II)and a structural unit represented by formula (III): ##STR2## wherein one of R.sub.1 and R.sub.2 represents a hydrogen atom and the other represents a methyl group;B represents a carbonate oligomer block represented by formula (IV): ##STR3## wherein X represents at least one linking group selected from ##STR4## --O--, --S--, --SO.sub.2 --, --SO--, and ##STR5## R.sub.3 and R.sub.4 each represents at least one of a hydrogen atom and a hydrocarbon group containing from 1 to 6 carbon atoms; Y.sub.1 and Y.sub.Type: GrantFiled: August 18, 1993Date of Patent: November 1, 1994Assignee: Hodogaya Chemical Co., Ltd.Inventors: Haruo Watanabe, Tsuyoshi Sato
-
Patent number: 5349102Abstract: A process for the preparation of an aromatic carbonate or polycarbonate from a phenol or bisphenol, methanol, carbon monoxide and oxygen comprising the steps of 1) reacting phenol or bisphenol with acetic anhydride to form (bis)phenyl acetate; 2) reacting dimethyl carbonate with (bis)phenyl acetate from step 1 to produce a phenyl carbonate or polycarbonate and methyl acetate; and 3) reacting the methyl acetate with carbon monoxide to produce acetic anhydride for use in step 1. In a desirable embodiment the dimethyl carbonate may also be prepared by reaction of methanol, carbon monoxide and oxygen.Type: GrantFiled: January 3, 1994Date of Patent: September 20, 1994Assignee: The Dow Chemical CompanyInventors: Hendrik Tuinstra, Cynthia L. Rand
-
Patent number: 5332800Abstract: This invention concerns cyclic aromatic amide oligomer compositions and a process for preparing such cyclic oligomers.Type: GrantFiled: October 12, 1993Date of Patent: July 26, 1994Assignee: E. I. Du Pont de Nemours and CompanyInventors: Anthony J. Arduengo, III, Wesley Memeger, Jr.
-
Patent number: 5322919Abstract: A process for producing polycarbonates which comprises transesterifying by reacting (A) at least one compound selected from the group consisting of aromatic dihydroxy compounds, aliphatic dihydroxy compounds, bisesters of aromatic dihydroxy compounds, bisesters of aliphatic dihydroxy compounds, carbonates of aromatic dihydroxy compounds and carbonates of aliphatic dihydroxy compounds, with (B) at least one compound selected from the group of diaryl carbonates, dialkyl carbonates, and alkylaryl carbonates, at a transesterification temperature of 100.degree. C. to 330.degree. C. in the presence of an inert solvent in an amount of 1 to 60% by weight based on the total of the theoretical amount of polycarbonate produced from the said compounds (A) and (B) and the amount of the inert solvent. According to the present invention, a polycarbonate which is excellent in color tone (transparency), heat resistance, and water resistance can be efficiently and simply produced at a low cost.Type: GrantFiled: November 20, 1991Date of Patent: June 21, 1994Assignee: Idemitsu Petrochemical Co., Ltd.Inventors: Kouichi Kurosawa, Shigeki Kuze, Noriyuki Kunishi, Masaya Okamoto
-
Patent number: 5314779Abstract: A process for the preparation of layered photoconductive imaging members which comprises forming layers comprised of a mixture of cyclic oligomers with degrees of polymerization of from about 2 to about 20 and a catalyst, wherein one layer contains a conductive filler, the second layer contains a photogenerating pigment and the third layer contains charge transporting molecules, and heating said layers to convert the cyclic oligomer mixture in each layer to a polycarbonate resin.Type: GrantFiled: August 24, 1992Date of Patent: May 24, 1994Assignee: Xerox CorporationInventors: Peter G. Odell, Trevor I. Martin
-
Patent number: 5302484Abstract: A process for the preparation of supporting substrates which comprises heating a mixture of cyclic oligomers with degrees of polymerization of from about 2 to about 20 and a catalyst.Type: GrantFiled: August 24, 1992Date of Patent: April 12, 1994Assignee: Xerox CorporationInventors: Peter G. Odell, Trevor I. Martin
-
Patent number: 5296567Abstract: The present document describes the use of an inhibitor for cationic polymerization as an additive to a thermocurable composition based on at least one cationically polymerizable organic material and an initiator for cationic polymerization in the form of an onium compound or a compound of the formula (I)[M.sup.+n (L).sub.x ].sup.n+ nX.sup.- (I),in which n is 2 or 3, M is a metal cation selected from the group comprising Zn.sup.2+, Mg.sup.2+, Fe.sup.2+, Co.sup.2+, Ni.sup.2+, Cr.sup.2+, Ru.sup.2+, Mn.sup.2+, Sn.sup.2+, VO.sup.2+, Fe.sup.3+, Al.sup.3+ and Co.sup.3+, X.sup.- is an anion selected from the group comprising PF.sub.6.sup.-, AsF.sub.6.sup.-, SbF.sub.6.sup.-, BiF.sub.6.sup.-, derivatives of these anions in which at least one fluorine atom has been replaced by a hydroxyl group, and CF.sub.3 SO.sub.3.sup.-, or in which up to 50% of the anions X.sup.-, based on the total amount of anions, may be any desired anions, L is water or an organic .sigma.Type: GrantFiled: April 6, 1992Date of Patent: March 22, 1994Assignee: Ciba-Geigy CorporationInventors: Dieter Baumann, Werner Margotte, Beat Muller
-
Patent number: 5294729Abstract: A process for preparing a block oligocarbonate is disclosed. The oligocarbonate conforms to ##STR1## where R denotes hydrogen or ##STR2## and where A denotes an aromatic carbonate structure conforming to ##STR3## where Ar is an aromatic radical, n is 2-6 and where B is the residue of an aliphatic polyol is disclosed. In the process a high molecular weight aromatic polycarbonate is reacted, in the melt and in the presence of a catalyst, with an aliphatic polyol. The block oligocarbonate is useful as a reactant in a process for the preparation of copolymers.Type: GrantFiled: July 27, 1993Date of Patent: March 15, 1994Assignee: Miles Inc.Inventors: Douglas A. Wicks, Dittmar K. Nerger, Rick L. Archey, Gary W. Munko
-
Patent number: 5288837Abstract: A process for preparing polycarbonate wherein a chain terminator is added to the reaction mixture after substantial reaction of a carbonate precursor, a coupling catalyst is added to the reaction mixture after substantial reaction of the chain terminator, and base is added to the reaction mixture after reaction mixture after substantial reaction of the chain terminator in an amount sufficient to give a negative chloroformate test.Type: GrantFiled: April 5, 1993Date of Patent: February 22, 1994Assignee: The Dow Chemical CompanyInventors: Sarat Munjal, Thomas M. Wardlow, Andrew F. Hall
-
Patent number: 5276134Abstract: A process for the preparation of an aromatic carbonate or polycarbonate from a phenol or bisphenol, methanol, carbon monoxide and oxygen comprising the steps of 1) reacting phenol or bisphenol with acetic anhydride to form (bis)phenyl acetate; 2) reacting dimethyl carbonate with (bis)phenyl acetate from step 1 to produce a phenyl carbonate or polycarbonate and methyl acetate; and 3) reacting the methyl acetate with carbon monoxide to produce acetic anhydride for use in step 1. In a desirable embodiment the dimethyl carbonate may also be prepared by reaction of methanol, carbon monoxide and oxygen.Type: GrantFiled: September 4, 1990Date of Patent: January 4, 1994Assignee: The Dow Chemical CompanyInventors: Hendrik E. Tuinstra, Cynthia L. Rand
-
Patent number: 5274074Abstract: This invention relates to medical devices formed totally or in part from homopolymers or copolymers comprising recurring carbonate moieties.Type: GrantFiled: July 22, 1992Date of Patent: December 28, 1993Assignee: United States Surgical CorporationInventors: Reginald T. Tang, Frank Mares, William J. Boyle, Jr., Tin-Ho Chiu, Kundanbhai M. Patel
-
Patent number: 5266659Abstract: The invention disclosed is an improved process for the preparation of high molecular weight poly(arylcarbonate), the molecular weight ranging from 45,000-60,000 (corresponding to n.sub.inh 0.8 to 1.0) The process involves heating in a controlled manner, a BPA-polycarbonate oligomer in the presence of a catalyst selected from alkali metal aryl acid, alkali metal borohydrial and a quarternary ammonium salt of bioxiyanion derived from a carboxylic acid poly(arylcarbonate)s of high molecular weight produced by the process of present invention show enhanced crystallinity.Type: GrantFiled: May 5, 1992Date of Patent: November 30, 1993Assignee: Council of Scientific & Industrial ResearchInventors: Swaminathan Sivaram, Jagdish C. Sehra, Venkat S. Iyer, Koyalagunta Ravindranath
-
Patent number: 5264548Abstract: A cyclic polycarbonate oligomer having a low melting point useful in the preparation of high molecular weight resins. The cyclic polycarbonate oligomers have structural units with long alkyl chains which may contain ester substituents.Type: GrantFiled: January 27, 1992Date of Patent: November 23, 1993Assignee: General Electric CompanyInventors: Daniel J. Brunelle, Thomas G. Shannon
-
Patent number: 5256764Abstract: This invention relates to medical devices formed totally or in part from homopolymers or copolymers comprising recurring carbonate moieties.Type: GrantFiled: July 22, 1992Date of Patent: October 26, 1993Assignee: United States Surgical CorporationInventors: Reginald T. Tang, Frank Mares, William J. Boyle, Jr., Tin-Ho Chiu, Kundanbhai M. Patel
-
Patent number: 5252683Abstract: A coating composition useful for shatter-proofing glass, capable of forming a film which allows an elongation of at least 400%. The coating composition includes (A) a polyurethane compound obtained by reaction of (a) a polycarbonate diol and/or (b) an aliphatic polyester diol, (c) an organic diisocyanate and (d) a chain extender possessing an active hydrogen-containing group in amounts to give an isocyanate group/active hydrogen-containing group equivalent ratio not exceeding 1.0, (B) an organic polyisocyanate compound and (C) a reactive silicone oil.Type: GrantFiled: March 29, 1991Date of Patent: October 12, 1993Assignee: Toyo Boseki Kabushiki KaishaInventors: Hiroshi Murata, Masami Oka, Hiroshi Fujimoto
-
Patent number: RE35499Abstract: A polycarbonate composition, and process for making same, wherein the monocarbonate and dicarbonate content is eliminated or limited to negligibly low levels by withholding introduction of chain terminator to the reaction mixture until the reaction of dihydroxy and carbonic acid derivative starting materials has run substantially to completion.Type: GrantFiled: May 17, 1993Date of Patent: April 29, 1997Assignee: The Dow Chemical CompanyInventors: Sarat Munjal, Che I. Kao