The Ring Nitrogen Of Each Of The Two Five-membered Hetero Rings Is Bonded Directly To The Same Atom Or Chain, Which Chain May Include A Ring (e.g., N,n'-ethylene-bisphthalimide, Etc.) Patents (Class 548/462)
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Patent number: 5191119Abstract: Methods are provided for substituting aromatic carboxylic acids and derivatives thereof and amino substituted aromatic carboxylic acids and derivatives thereof, by forming imides and imide-amides, respectively, by acylation with aliphatic carboxylic acids, substituting at least one nitrogen atom under mild basic conditions with an aliphatic compound having as alkylating agent a displaceable functionality and removing undesired acyl groups, as appropriate.Type: GrantFiled: July 5, 1990Date of Patent: March 2, 1993Assignee: Cook Imaging Corp.Inventors: Milos Sovak, Ramachandran Ranganathan
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Patent number: 5185452Abstract: The invention concerns novel, pharmaceutically useful, benzheterocyclyl sulphones of the formula I: ##STR1## in which ring A may bear optional halogeno, (1-4C)alkyl or fluoro(1-4C)alkyl substituents; X is oxygen, or a group of the formula --S(O).sub.n -- or --NR.sup.1 -- in which n is zero, 1 or 2 and R.sup.1 is hydrogen, (1-4C)alkyl, (1-6C)alkanoyl, benzoyl or phenyl(1-4C)alkyl, the last two optionally substituted; Y is various linking groups defined hereinafter, such as ethylene or trimethylene; and in which the group --SO.sub.2 CH.sub.2 NO.sub.2 is located at position a, b or c in ring A; together with the non-toxic thereof. Other aspects of the invention include the production of the novel compounds by analogy processes and pharmaceutical compositions of the novel compounds for use in the treatment of diabetic complications.Type: GrantFiled: February 5, 1990Date of Patent: February 9, 1993Assignee: Imperial Chemical Industries PLCInventors: David R. Brittain, Michael T. Cox
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Patent number: 5175304Abstract: Polyetherimide oligomers having crosslinking end cap moieties which provide improved solvent-resistance to cured composites are generally represented by the formula: ##STR1## wherein X=--O-- or --S--; ##STR2## n=1 or 2; ##STR3## E=allyl or methallyl; R=a trivalent C.sub.(6-13) aromatic organic radical;R.sub.1 =any of lower alkyl, lower alkoxy, aryl, or substituted aryl;R'=a divalent C.sub.(6-30) aromatic organic radical;j=0, 1, or 2; andG=--CH.sub.2 --, --O--, --S--, or --SO.sub.2 --Blends generally comprise substantially equimolar amounts of the oligomers and a comparable, compatible, noncrosslinking, etherimide polymer of substantially the same backbone. The crosslinkable oligomers are made by reacting substituted phthalic anhydrides with hydroxyaryl amines and suitable crosslinking end cap reactants, or by self-condensation of phthalimide salts followed by capping the polymers.Type: GrantFiled: May 10, 1990Date of Patent: December 29, 1992Assignee: The Boeing CompanyInventors: Clyde H. Sheppard, Hyman R. Lubowitz
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Patent number: 5175307Abstract: Disclosed is a diacetylene compound comprising, as structural units,(a) at least one member selected from diacetylene group-containing organic groups of the formulae (I) and (II):R.sup.I --C.tbd.C--C.tbd.C--R.sup.II -- (I)and--R.sup.III --C.tbd.C--C.tbd.C--R.sup.IV -- (II)wherein R.sup.I is hydrogen or a (Cl-16) monovalent organic group, and R.sup.II, R.sup.III and R.sup.IV are a (C1-13) divalent organic group,(b) at least one organic group having at least one carbon-to-carbon double bond, and (c) at least one connecting group connecting the units (a) and (b), which connecting group is selected from amide, imide, ester, ether, amino, imino, urethane, sulfonyl and carbonyl bonds. A cured shaped article made of this compound exhibits isotropically a high elastic modulus and has excellent mechanical properties.Type: GrantFiled: November 28, 1990Date of Patent: December 29, 1992Assignee: Agency of Industrial Science & TechnologyInventors: Katsuyuki Nakamura, Satoru Yamazaki, Jinichiro Kato, Kensaku Tokushige
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Patent number: 5166360Abstract: The yellowness index of a flame retardant N,N'-alkylene-bis-(tetrahalophthalimide), such as N,N'-ethylene-bis-(tetrabromophthalimide), is reduced by treating the bis-imide with strong mineral acid.Type: GrantFiled: May 7, 1991Date of Patent: November 24, 1992Assignee: Ethyl CorporationInventors: Michael G. McKenna, Robert M. Moore, Jr.
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Patent number: 5136047Abstract: This invention relates to a process for preparing a white flame retardant product which principally contains a bisimide. The process comprises: providing an essentially water-free solution containing tetrabromophthalic anhydride and a solvent in a reaction vessel; forming a reaction mass by adding a diamine or a diamine salt to the solution at an addition rate such that, at the addition temperature, water formed during the addition is removed from the reaction mass substantially as it is formed; terminating the addition of the diamine when the molar ratio of the tetrabromophthalic anhydride initially present in the solution to the diamine or diamine salt added is at least about 2.00:1; maintaining the reaction mass at a temperature of at least 125.degree. C. for at least 0.5 hr after the addition; and recover from the reaction mass the flame retardant product.Type: GrantFiled: February 19, 1991Date of Patent: August 4, 1992Assignee: Ethyl CorporationInventors: Mo A. Khuddus, David R. Brackenridge
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Patent number: 5072000Abstract: The invention relates to a method of producing imide bond-containing compounds and flame retardants comprising such compounds. The method comprises reacting an acid anhydride with an isocyanate compound in an inert solvent in the presence of a tertiary amine as catalyst. The imide bond-containing compounds thus obtained provide flammable substances with good flame resistance and at the same time themselves have good heat resistance and weather resistance. Therefore, the flame retardants comprising such compounds have a wide field of application.Type: GrantFiled: January 23, 1989Date of Patent: December 10, 1991Assignee: Dai-Ichi Kogyo Seiyaku Co., Ltd.Inventors: Akira Taniuchi, Hirohito Komori, Koichi Niwa
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Patent number: 5049601Abstract: This invention relates to a process for enhancing the properties of alkylene(C.sub.1 -C.sub.6)-bis-(tetrabromophthalimide) or bis-(tetrabromophthalimide) produced by the bromination, respectively, of alkylene(C.sub.1 -C.sub.6)-bis-(phthalimide) or bis-(phthalimide) with a brominating agent in the presence of oleum, the process comprising curing the alkylene(C.sub.1 -C.sub.6)bis-(tetrabromophthalimide) or bis-(tetrabromophthalimide) at a temperature above about 150.degree. C. and below the melting point of the tetrabromophthalimide being cured for a period of from about 36 hours to about 5 hours. This enhanced product and its use in molding and extrusion compositions and in molded and extruded articles is also disclosed.Type: GrantFiled: July 24, 1989Date of Patent: September 17, 1991Assignee: Ethyl CorporationInventor: Mo A. Khuddus
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Patent number: 4992557Abstract: In a first embodiment this invention relates to a process for preparing a white product which principally contains a bisimide. The process comprises: providing tetrabromophthalic anhydride and a solvent in a reaction vessel; forming, at a temperature within the range of from about 140.degree. C. to about 200.degree. C., a reaction mass by adding a diamine, a diamine salt or a mixture thereof to the solution, the formation of the reaction mass resulting in the production of a bisimide precipitate which becomes a component of the reaction mass; terminating the addition of the diamine when the molar ratio of the tetrabromophthalic anhydride initially present in the solution to the diamine or diamine salt added is substantially stoichiometric; cooking the bisimide precipitate to increase the average sphericity of the particles making up the bisimide precipitate; and recovering from the reaction mass, as the bisimide product, the cooked precipitate.Type: GrantFiled: March 5, 1990Date of Patent: February 12, 1991Assignee: Ethyl CorporationInventors: Donald O. Hutchinson, Ali M. Dadgar, Keith G. Anderson
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Patent number: 4990626Abstract: In a first embodiment this invention relates to a process for preparing a white product which principally contains a bisimide. The process comprises: providing tetrabromophthalic anhydride and a solvent in a reaction vessel; forming, at a temperature within the range of from about 140.degree. C. to about 200.degree. C., a reaction mass by adding a diamine, a diamine salt or a mixture thereof to the solution, the formation of the reaction mass resulting in the production of a bisimide precipitate which becomes a component of the reaction mass; terminating the addition of the diamine when the molar ratio of the tetrabromophthalic anhydride initially present in the solution to the diamine or diamine salt added is substantially stoichiometric; cooking the bisimide precipitate to increase the average sphericity of the particles making up the bisimide precipitate; and recovering from the reaction mass, as the bisimide product, the cooked precipitate.Type: GrantFiled: April 4, 1989Date of Patent: February 5, 1991Assignee: Ethyl CorporationInventors: Donald O. Hutchinson, Ali M. Dadgar, Keith G. Anderson
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Patent number: 4959481Abstract: Novel flame retardant agents comprise polyalkylene oxides or a derivative thereof and end-capped with brominated phthalimide groups, and have the general formulae ##STR1## R.sup.1 is alkylene of from about 2 to about 6 carbon atoms; R.sup.1 is alkyl of from about 1 to about 6 carbon atoms; n is from about 4 to about 40; n' is from about 3 to about 15; and n" is from about 1 to about 10. Thermoplastic compositions, for example, polyphenylene ether compositions, rendered flame retardant with the novel compounds have a high resistance to additive vaporization and surface liquid exudation as well as desirable high flow characteristics.Type: GrantFiled: May 4, 1988Date of Patent: September 25, 1990Assignee: General Electric CompanyInventors: Robert J. Axelrod, Donald B. G. Jaquiss, John A. Tyrell
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Patent number: 4940802Abstract: A 4,4'-bis(phthalimido)diphenyl sulfone compound having the formula: ##STR1## wherein X is a halogen atom, k=0 to 4, l=0 to 4, m=0 to 4 and n=0 to 4, provided k+l+m+n>1.Type: GrantFiled: December 8, 1988Date of Patent: July 10, 1990Assignee: Tosoh CorporationInventors: Takao Matsuba, Masashige Kubo, Takumi Kagawa, Kiyotaka Oyama, Koji Kawabata
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Patent number: 4923888Abstract: The present invention relates to novel compounds of the general formula (I), ##STR1## wherein R stands for hydrogen, halogen, C.sub.1-4 alkyl, C.sub.1-4 alkoxy or C.sub.1-4 acylamino group;R.sub.1 means hydrogen or a carboxyl-protective group; andR.sub.2 represents a --(CH.sub.2).sub.n --CO.sub.2 R.sub.5 group, whereinn is 1, 2, 3 or 4; andR.sub.5 stands for hydrogen or a carboxyl-protective group; orR.sub.2 means a --(CH.sub.2).sub.n --NH.sub.2 group, whereinn is 1, 2, 3 or 4of E and/or Z configurtion as well as their salts.The compounds according to the invention show a cytoprotective effect and promote the healing of the stomach ulcer. Their toxicity is low.Type: GrantFiled: September 26, 1988Date of Patent: May 8, 1990Assignee: Richter Gedeon Vegyeszeti Gyar RTInventors: Tamas Fodor, Laaszlo Dobay, Jaanos Fischer, Bela Stefkoo, Elemeer Ezer, Judit Matuz, Katalin Saghy, Laaszlo Szporny
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Patent number: 4914213Abstract: A 5-hydroxy-N-substituted indole derivative and the process for producing the indole derivative are described the indole derivative is produced by a process comprising reacting a phenol derivative having an unsaturated double bond in the m-position with a diazonium salt.Type: GrantFiled: February 4, 1987Date of Patent: April 3, 1990Assignee: Fuji Photo Film Co., Ltd.Inventor: Masato Satomura
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Patent number: 4914212Abstract: This invention relates to a process for preparing a white flame retardant product which principally contains a bisimide. The process comprises: providing an essentially water-free solution containing tetrabromophthalic anhydride and a solvent in a reaction vessel; forming a reaction mass by adding a diamine or a diamine salt to the solution at an addition rate such that, at the addition temperature, water formed during the addition is removed from the reaction mass substantially as it is formed; terminating the addition of the diamine when the molar ratio of the tetrabromophthalic anhydride initially present in the solution to the diamine or diamine salt added is at least about 2.00:1; maintaining the reaction mass at a temperature of at least 125.degree. C. for at least 0.5 hr after the addition; and recovering from the reaction mass the flame retardant product.Type: GrantFiled: June 23, 1988Date of Patent: April 3, 1990Assignee: Ethyl CorporationInventors: Mo A. Khuddus, David R. Brackenridge
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Patent number: 4904795Abstract: Novel halogen-substituted phthalimides are provided which are the reaction product of a halogenated phthalic anhydride with an alkoxylated amine or the reaction product of a halogenated phthalic anhydride with a siloxy amine. The halogen-substituted phthalimides are useful in increasing the flame retardancy of thermoplastic and thermosetting resins, and are also effective as processing aids in improving the flowability and moldability of thermoplastic resins during melt processing.Type: GrantFiled: March 25, 1988Date of Patent: February 27, 1990Assignee: Pennwalt CorporationInventors: Joseph M. Bohen, Gerald H. Reifenberg, Daryl L. Stein
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Patent number: 4894187Abstract: The invention relates to the preparation of halogenated imides derived from hydrazine and halogenated dicarboxylic acid anhydride and which can be used as flameproofing agents for plastics. The condensation of hydrazine and halogenated dicarboxylic acid anhydride is carried out in an aqueous medium, at a temperature ranging from 40.degree. to 225.degree. C., with a molar ratio of anhydride/hydrazine substantially equal to 2.Type: GrantFiled: February 8, 1988Date of Patent: January 16, 1990Assignee: AtochemInventors: Evelyne Bonnet, Andre Gagnieur, Bernard Gurtner
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Patent number: 4873341Abstract: This invention relates to a method for preparing a white or at least near-white product which is predominant in alkylene(C.sub.1 -C.sub.5)-bis-(tetrabromophthalimide). This method comprises: forming a solution which contains, as a solvent, (i) SO.sub.3 or fuming sulfuric acid, and (ii) a haloalkane of the formula RX.sub.n, wherein R is an alkyl group containing up to two carbon atoms, X is a halogen selected independently from Br and Cl, and n is 2 or 3 when R is an alkyl containing 1 carbon atom and is 1, 2 or 3 when R is an alkyl group containing 2 carbon atoms, and, as a solute, the yellow alkylene(C.sub.1 -C.sub.5)-bis-tetrabromophthalimide predominant product obtained from the reaction of tetrabromophthalic anhydride and diaminoalkane is the presence of water and alkanoic acid; and adding water to said solution to precipitate therefrom the white or at least near-white product.Type: GrantFiled: September 19, 1988Date of Patent: October 10, 1989Assignee: Ethyl CorporationInventor: Keith G. Anderson
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Patent number: 4871863Abstract: This invention relates to a process for enhancing the properties of alkylene(C.sub.1 -C.sub.6)-bis-(tetrabromophthalimide) or bis-(tetrabromophthalimide) products produced by the bromination, respectively, of alkylene(C.sub.1 -C.sub.6)-bis-(phthalimide) or bis-(phthalimide) with a brominating agent in the presence of oleum, the process comprising curing the alkylene(C.sub.1 -C.sub.6)bis-(tetrabromophthalimide) or bis-(tetrabromophthalimide) products at a temperature above about 150.degree. C. and below the melting point of the tetrabromophthalimide being cured for a period of from about 36 hours to about 5 hours. This enhanced product and its use in molding and extrusion compositions and in molded and extruded articles is also disclosed.Type: GrantFiled: February 1, 1988Date of Patent: October 3, 1989Assignee: Ethyl CorporationInventor: Mo A. Khuddus
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Patent number: 4853407Abstract: Compounds represented by formula ##STR1## wherein Y.sup.1 and Y.sup.2 are identical or different, and respectively denote benzoylamino groups or phthalimide groups. This compound is useful for inhibition of dipeptidase.Type: GrantFiled: May 20, 1988Date of Patent: August 1, 1989Assignee: Sanraku IncorporatedInventors: Norio Shibamoto, Takeo Yoshioka, Yasuo Fukagawa, Tomoyuki Ishikura
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Patent number: 4826976Abstract: This invention relates to a color-shifted dye compounds containing at least one thermally unstable carbamate moiety which are useful in thermal imaging. These compounds may be represented by the formula [M--(X).sub.q ].sub.p D wherein M is a carbamate moiety; X is --N.dbd., --SO.sub.2 -- or --CH.sub.2 --; D taken with X and M represents the radical of a color-shifted organic dye, said carbamate moiety M comprising a tert-alkoxycarbonyl group, ##STR1## wherein R' is halomethyl or alkyl.Type: GrantFiled: December 18, 1987Date of Patent: May 2, 1989Assignee: Polaroid CorporationInventors: Alan L. Borror, Ernest W. Ellis, Donald A. McGowan
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Patent number: 4769475Abstract: The present invention provides a bis(hydroxyphthalimide) prepared by reacting 4-hydroxyphthalic anhydride and an organic diamine in the presence of an organic solvent under heating. The bis(hydroxyphthalimide) has two intramolecular imide rings and active hydrogens, and is thus polymerizable to form a variety of polycondensation products each having imide rings by condensation. The bis(hydroxyphthalimide) is also reacted with a dicarboxylic acid dihalide to form a polyesterimide, through condensation, which is excellent in transparency and heat resisting property.Type: GrantFiled: March 14, 1986Date of Patent: September 6, 1988Assignee: Nippon Telegraph and Telephone CorporationInventors: Shigekuni Sasaki, Yoshinori Hasuda
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Patent number: 4764217Abstract: Composition containing(a) an isoindoline pigment of the formula I ##STR1## and (b) a compound of the formula II ##STR2## Pigment mixtures of this kind, in particular when used in paints, are distinguished in particular by increased tinctorial strength and high lustre and especially by improved rheology.For the definition of the substituents and symbols R.sub.1, R.sub.2, R.sub.3, R.sub.4, Q, X, Y and Z, see claim 1.Type: GrantFiled: December 7, 1987Date of Patent: August 16, 1988Assignee: Ciba-Geigy CorporationInventors: Jost von der Crone, Bernhard Medinger, Philippe Bugnon
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Patent number: 4707553Abstract: A 5-hydroxy-N-substituted indole derivative and the process for producing the indole derivative are described the indole derivative is produced by a process comprising reacting a phenol derivative having an unsaturated double bond in the m-position with a diazonium salt.Type: GrantFiled: December 28, 1984Date of Patent: November 17, 1987Assignee: Fuji Photo Film Co., Ltd.Inventor: Masato Satomura
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Patent number: 4683276Abstract: Thermoset products are prepared by polymerizing (A) at least one thermosettable compound which contains both a maleimide group and a cyanate group such as 3-(2,5-dihydro-2,5-dioxo-1H-pyrrol-1-yl)phenyl cyanate and optionally (B) at least one of (1) at least one aromatic polycyanate such as bisphenol A dicyanate; (2) at least one polymaleimide such as N,N'-(methylenedi-p-phenylene)bismaleimide; (3) at least one material having an average of more than one vicinal epoxide group per molecule such as a diglycidyl ether of bisphenol A; (4) at least one polymerizable ethylenically unsaturated material such as styrene; or (5) a mixture of any two or more of components 1-4 in any combination.Type: GrantFiled: October 1, 1985Date of Patent: July 28, 1987Assignee: The Dow Chemical CompanyInventor: Robert E. Hefner, Jr.
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Patent number: 4659567Abstract: A phosphonamidate or phosphonate analog-ligand having a conformation that substantially corresponds to the conformation of a hydrolytic transition state of an amide or ester ligand is used to produce antibodies of predetermined specificity. The antibodies include an epitope that binds to and thereby stabilizes the tetrahedral carbon atom of the amide or ester hydrolysis transition state of the ligand to hydrolyze the ligand at a predetermined site.Type: GrantFiled: September 7, 1984Date of Patent: April 21, 1987Assignee: Scripps Clinic & Research FoundationInventors: Alfonso Tramontano, Richard A. Lerner
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Patent number: 4644066Abstract: Flame retardants having good stability at the processing temperatures of high melting polymers are described. The flame retardants are halogen-containing bis-imides, for example, those of the formula ##STR1## R being defined in the specification.Type: GrantFiled: May 15, 1985Date of Patent: February 17, 1987Assignee: Raychem CorporationInventor: Joseph Sonnenberg
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Patent number: 4632949Abstract: The present invention relates to novel N-(alkoxyphenyl) phthalimides conforming to the structure ##STR1## wherein X is a halogen atom, R is a C.sub.1 -C.sub.4 alkyl, g is 1 to 5, n is an integer of from 0 to 4, m is either 0 or 1 and p is either 0 or 1. The phthalimide thus disclosed was found to be suitable as a flame retarding additive for thermoplastic molding compositions, especially compositions comprising polycarbonate resins.Type: GrantFiled: December 31, 1984Date of Patent: December 30, 1986Assignee: Mobay Chemical CorporationInventor: Sivaram Krishnan
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Patent number: 4560768Abstract: Polyimido-ester compounds having the formula RO--C(O)--R.sub.1 --C(O)--OR are disclosed wherein R is an alkylene N-dicarboximido radical containing cycloolefinic unsaturation and R.sub.1 is the divalent residue of an unsaturated polycarboxylic acid such as fumaric, itaconic, aconitic, mesaconic, or glutaconic acid. These compounds are blended with unsaturated resins such as unsaturated polyester resin or vinyl ester resin, and polymerizable unsaturated monomers such as styrene to provide thermosettable resin compositions which can be cured to provide castings or laminates with improved resistance to thermal aging.Type: GrantFiled: December 16, 1983Date of Patent: December 24, 1985Assignee: The Dow Chemical CompanyInventors: Robert E. Hefner, Jr., Douglas L. Hunter
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Patent number: 4550208Abstract: 4,4'-diaminobenzophenones of the formula I ##STR1## where the rings A and B can be further substituted, are prepared by a process in which a compound of the formula II ##STR2## where the rings A, B and E can be substituted, is oxidized with aqueous nitric acid in the presence of nitrobenzene or of an alkanoic acid and under superatmospheric pressure, and the reaction product is cleaved.The process according to the invention gives the compounds of the formula I in high yield and purity.Type: GrantFiled: November 21, 1984Date of Patent: October 29, 1985Assignee: BASF AktiengesellschaftInventors: Walter Disteldorf, Wolfgang Eisfeld, Rolf-Dieter Kohler
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Patent number: 4535170Abstract: Flame retardants having good stability at the processing temperatures of high melting polymers are described. The flame retardants are halogen-containing bis-imides, for example, those of the formula ##STR1## R being defined in the specification.Type: GrantFiled: September 21, 1980Date of Patent: August 13, 1985Assignee: Raychem CorporationInventor: Joseph Sonnenberg
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Patent number: 4460783Abstract: An ether imide of the formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6 and D are as defined in the specification produced by reacting a diamine with an ethylenically unsaturated dicarboxylic acid can give a composition together with one or more unsaturated polyesters, epoxy compounds, amines, and the like to give shaped articles excellent in flexibility and heat resistance.Type: GrantFiled: January 19, 1981Date of Patent: July 17, 1984Assignee: Hitachi, Ltd.Inventors: Akio Nishikawa, Masashi Shitara, Susumu Era, Toshiaki Fukushima, Hiroshi Suzuki, Hisashi Kohkame
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Patent number: 4414396Abstract: Polyhalophthalimidoalkyl-functional carbonates may be employed as fire retardant additives to polymers. Examples of such carbonates are 2-(tetrabromophthalimido)ethyl 2,4,6-tribromophenyl carbonate, 2-(tetrabromophthalimido)ethyl pentabromophenyl carbonate and bis[2-(tetrabromophthalimido)ethyl] carbonate.Polyhalophthalimidoalkyl haloformates, N-(hydroxyalkyl)-polyhalophthalimides, and 2-(hydroxyalkylcarbamyl)-polyhalobenzoic acids are useful as intermediates in the preparation of the carbonates.Type: GrantFiled: January 7, 1982Date of Patent: November 8, 1983Assignee: PPG Industries, Inc.Inventor: Nicodemus E. Boyer
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Patent number: 4377673Abstract: Novel, unsaturated diacteylene-terminated polyimides and processes for their preparation are disclosed herein. These new polyimides are derivatives of anhydride-terminated aromatic polyimides from which they can be prepared by amidation to provide new unsaturated amide groups having a terminal group containing the structure --C.tbd.C--C.tbd.C--, hereinafter sometimes referred to as "conjugated diynes". These new compositions are more tractable than the original anhydride-terminated polyimides and can be converted at appropriate lower temperatures to crosslinked, insoluble, infusible polymers without by-product formation, thereby extending greatly the applications for which the aromatic polyimides can be employed. Moreover, these new polyimides can undergo the Diels-Alder type of addition with a large number of dienophiles. Certain monomeric materials are also described.Type: GrantFiled: March 2, 1982Date of Patent: March 22, 1983Assignee: Plastics Engineering CompanyInventors: Gaetano F. D'Alelio, deceased, Phillip A. Waitkus
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Patent number: 4377525Abstract: Novel, unsaturated diacetylene-terminated polyimides and processes for their preparation are disclosed herein. These new polyimides are derivatives of anhydride-terminated aromatic polyimides from which they can be prepared by amidation to provide new unsaturated amide groups having a terminal group containing the structure --C.tbd.C--C.tbd.C--, hereinafter sometimes referred to as "conjugated diynes". These new compositions are more tractable than the original anhydride-terminated polyimides and can be converted at appropriate lower temperatures to crosslinked, insoluble, infusible polymers without by-product formation, thereby extending greatly the applications for which the aromatic polyimides can be employed. Moreover, these new polyimides can undergo the Diels-Alder type of addition with a large number of dienophiles. Certain monomeric materials are also described.Type: GrantFiled: March 2, 1982Date of Patent: March 22, 1983Assignee: Plastics Engineering CompanyInventors: Gaetano F. D'Alelio, deceased, Phillip A. Waitkus
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Patent number: 4374220Abstract: Flame retardants having good stability at the processing temperatures of high melting polymers are described. The flame retardants are halogen-containing bis-imides, for example, those of the formula ##STR1## R being defined in the specification.Type: GrantFiled: May 14, 1981Date of Patent: February 15, 1983Assignee: Raychem CorporationInventor: Joseph Sonnenberg
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Patent number: 4365068Abstract: New crosslinkable bis-imidyl derivatives are described which can be produced by reaction of imidylphthalic acid derivatives, such as maleimidyl-phthalic acid anhydrides, with monomeric, oligomeric or polymeric diamines. The new crosslinkable bis-imidyl derivatives can be used for producing crosslinked polymers which are distinguished, in particular, by their stability to oxidation and to heat.Type: GrantFiled: November 14, 1980Date of Patent: December 21, 1982Assignee: Ciba-Geigy CorporationInventors: Roland Darms, Vratislav Kvita, Gerd Greber
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Patent number: 4331794Abstract: Novel, unsaturated diacetylene-terminated polyimides and processes for their preparation are disclosed herein. These new polyimides are derivatives of anhydride-terminated aromatic polyimides from which they can be prepared by amidation to provide new unsaturated amide groups having a terminal group containing the structure --C.tbd.C--C.tbd.C--, hereinafter sometimes referred to as "conjugated diynes". These new compositions are more tractable than the original anhydride-terminated polyimides and can be converted at appropriate lower temperatures to crosslinked, insoluble, infusible polymers without by-product formation, thereby extending greatly the applications for which the aromatic polyimides can be employed. Moreover, these new polyimides can undergo can be employed. Moreover, these new polyimides can undergo the Diels-Alder type of addition with a large number of dienophiles. Certain monomeric materials are also described.Type: GrantFiled: October 22, 1980Date of Patent: May 25, 1982Assignee: Plastics Engineering CompanyInventors: Gaetano F. D'Alelio, deceased, Phillip A. Waitkus