Aryl Ring-containing Reactant Patents (Class 528/347)
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Patent number: 5780578Abstract: The invention provides a polymer composed of vinyl monomers bearing imidazole, hydroxyl and carboxyl groups arranged in proximity to each other, that exhibits hydrolytic activity similar to serine proteases, and a process for its preparation. The polymer is useful for the hydrolysis of esters and amides to the corresponding alcohols and amines.Type: GrantFiled: March 14, 1996Date of Patent: July 14, 1998Assignee: Council Of Scientific & Industrial ResearchInventors: Raghunath Anant Mashelkar, Mohan Gopalkishna Kulkarni, Rohini Nitin Karmalkar
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Patent number: 5777066Abstract: A method for producing poly-o-hydroxy amides by conversion of an activated dicarboxylic acid derivative with a bis-o-aminophenol. A solution of the activated dicarboxylic acid derivative is added to a solution of the bis-o-aminophenol in a lactone, and a tertiary amine is added to the resulting mixture, wherein the lactone has the following structure: ##STR1## where A is--(CR.sup.1 R.sup.2).sub.m --or--(CR.sup.3 R.sup.4).sub.n --NR.sup.5 --,R.sup.1 to R.sup.5 are independent of one anotherR.sup.1 and R.sup.2 are hydrogen, alkyl with 1 to 7 carbon atoms (linear or branched), --CO(CH.sub.2).sub.p CH.sub.3, or --COO(CH.sub.2).sub.p CH.sub.3, with p=0 or 1,R.sup.3 and R.sup.4 are hydrogen or alkyl with 1 to 3 carbon atoms (linear or branched),R.sup.5 is hydrogen or methyl,m is a whole number from 2 to 11, andn is a whole number from 1 to 3.Type: GrantFiled: June 19, 1996Date of Patent: July 7, 1998Assignee: Siemens AktiengesellschaftInventors: Recai Sezi, Hellmut Ahne, Eva Rissel
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Patent number: 5776875Abstract: A biodegradable scale inhibitor and dispersant is provided. The scale inhibitor includes a copolymer comprising at least one of N-oxygenatedhydrocarbonamide monomers and at least one of amino acid monomers. A method of reducing scale build-up on heating exchanger surfaces that come in contact with an industrial water is provided by adding a copolymer comprising at least one of N-oxygenatedhydrocarbonamide monomers and at least one of amino acid monomers to the water system such as cooling towers.Type: GrantFiled: July 16, 1996Date of Patent: July 7, 1998Assignee: Nalco Chemical CompanyInventors: Jiansheng Tang, Ronald V. Davis
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Patent number: 5773558Abstract: Colorless, amorphous polyamide, or blends or alloys thereof, and the molded articles with high alternate bending strengths are made available; they are preferably made up of unbranched aliphatic diamines and cycloaliphatic dicarboxylic acids, and have high strength, high rigidity, high heat distortion, and good solvent resistance.Type: GrantFiled: September 24, 1997Date of Patent: June 30, 1998Assignee: EMS-Inventa AGInventor: Hans Dalla Torre
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Patent number: 5770680Abstract: A process is provided for preparing a dispersion of a polyamide in water, said process comprising:dissolving a polyamide having an amine value of greater than about 2 in an organic solvent to form a solution of said polyamide in said solvent, said polyamide and said solvent being at a temperature below the softening point of, said polyamide during said dissolving, said solution further comprising a surfactant and an inorganic alkaline material,adding sufficient water containing an acid to said solution with mixing to form an oil-in-water dispersion, the temperature of said solution and said water being below the softening point of said polyamide during said adding, the amount of said acid being sufficient to neutralize a portion of said inorganic alkaline material, but insufficient to coagulate said polyamide from the resulting oil-in-water dispersion, andremoving at least a major amount of said organic solvent from said oil-in-water dispersion.Type: GrantFiled: October 25, 1996Date of Patent: June 23, 1998Inventors: Stephen A. Fischer, David I. Devore, Kartar S. Arora, Reimar Heucher
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Patent number: 5763561Abstract: Improved high temperature polyamides, and particularly partially aromatic polyamides, containing less than about 40 .mu.eq/g carboxylic acid endgroups, when stabilized with a copper-containing thermal stabilizer, the polyamides exhibit improved thermal oxidative stability.Type: GrantFiled: May 27, 1997Date of Patent: June 9, 1998Assignee: Amoco CorporationInventor: Robert G. Keske
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Patent number: 5750639Abstract: A polyamide resin composition having good molding fluidity, heat and chemical resistance and dimensional stability is provided containing: (A) 30-90 weight percent, based on components (A) and (B), of a polyamide resin containing (i) 10-99 weight percent, based on components (i) and (ii) of an aromatic polyamide containing a carboxylic acid component derived from terephthalic acid or a mixture of terephthalic and isophthalic acid in which the isophthalic acid constitutes 40 mole percent or less of the mixture, and an aliphatic diamine component derived from a mixture of hexamethylene diamine and 2-methylpentamethylene diamine; and (ii) 1-90 weight percent, based on components (i) and (ii), of at least one polyamide selected from the group consisting of polyamides containing repeat units derived from alipathic dicarboxylic acids and alipathic diamines and polyamides containing repeat units derived from aliphatic aminocarboxylic acids; and (B) 10-70 weight percent, based on components (A) and (B), of an inorganType: GrantFiled: July 24, 1996Date of Patent: May 12, 1998Assignee: E. I. du Pont de Nemours and CompanyInventor: Ryuichi Hayashi
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Patent number: 5731403Abstract: This invention concerns a low temperature process for the manufacture of nylon.Type: GrantFiled: July 30, 1996Date of Patent: March 24, 1998Assignee: E. I. du Pont de Nemours and CompanyInventor: James Joseph Lang
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Patent number: 5728799Abstract: The present invention is directed to an aromatic polyamide of formula (I), ##STR1## an optical anisotropic dope containing the aromatic polyamide and a process of making the optical anisotropic dope which does not require sulfuric acid. R is an unsubstituted aromatic group or an aromatic group having at least one nitrile group substituted on the aromatic nucleus, with the proviso that at least 25 mol % of R in the aromatic polyamide is an aromatic group having at least one nitrile group substituted on the aromatic nucleus; R' is phenyl, naphthyl or diphenyl, which is unsubstituted or substituted with Cl, Br, I, NO.sub.2, an alkyl group having one to four carbon atoms or an alkoxy group having one to four carbon atoms; and n is an integer between 10 and 100,000.Type: GrantFiled: August 31, 1995Date of Patent: March 17, 1998Assignee: Kolon Industries, Inc.Inventor: Tae-Jin Oh
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Patent number: 5723569Abstract: A random copolymerized polyamide resin is prepared by reacting a lactam of the formula (I): ##STR1## wherein R.sup.1 is a C.sub.2-11 alkylene group optionally substituted with a substituent having 1 to 6 carbon atoms, with a hexamethylenediamine-adipic acid salt while concentrating the aqueous solution of the salt to a concentration of at least 70% by weight and while maintaining a uniform reaction phase at all times by controlling the pressure over and the temperature of the reaction medium such that the hexamethylenediamine-adipic acid salt does not precipitate, said pressure being up to not greater than 2 kg/cm.sup.2 .multidot.G and said temperature being up to not greater than 150.degree. C., and then mixing in the solution of the lactam of formula (I) thereby effecting copolymerization and forming a polyamide resin having a relative viscosity measured by the sulfuric acid solution method (1% at 25.degree. C.) of 1.5 to 8.0.Type: GrantFiled: September 13, 1996Date of Patent: March 3, 1998Assignee: Mitsubishi Chemical CorporationInventors: Shin-ichi Sato, Masaaki Miyamoto, Kenji Tsuruhara, Yoshiaki Ohtani
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Patent number: 5708125Abstract: A process for producing precondensates of partially crystalline or amorphous, thermoplastically processable, partially aromatic polyamides or copolyamides, and the use of the higher molecular weight of polyamides, accessible from the precondensates, for producing molding compositions, which are further processable by means of suitable processing techniques, involves the control of temperature and water vapor partial pressure, in a batch process.Type: GrantFiled: July 6, 1995Date of Patent: January 13, 1998Assignee: EMS-Inventa AGInventors: Hanns-Jorg Liedloff, Manfred Schmid
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Patent number: 5688906Abstract: A method for forming a polyamic acid having nonlinear optical (NLO) or pre-NLO side chains, which method includes the steps of:(1) providing a bis-(aromatic dicarboxylic acid anhydride) containing at least one NLO or pre-NLO side chain having the structure represented by:D-R-Awherein D, R and A form a delocalized resonance configuration in which R is a pi-conjugated non-centrosymmetric moiety, A is hydrogen or an electron withdrawing moiety and D is an electron donating moiety covalently linked to the bis-(aromatic dicarboxylic acid anhydride); and(2) reacting the bis-(aromatic dicarboxylic acid anhydride) with an aromatic diamine to form a polyamic acid having NLO or pre-NLO side chains. Methods for preparing polyamic acids having NLO or pre-NLO side chains by reacting aromatic diamines having NLO or pre-NLO side chains with bis-(aromatic dicarboxylic acid anhydrides) are also disclosed. Methods of forming the polyamic acids into polyimides having NLO side chains are also included.Type: GrantFiled: August 7, 1995Date of Patent: November 18, 1997Assignee: Enichem S.p.A.Inventors: Kwan-Yue Alex Jen, Kevin Joel Drost
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Patent number: 5684120Abstract: Colorless, transparent copolyamides, made up of monomers based on cycloaliphatic diamines and aromatic dicarboxylic acids and a maximum of 20 mol % of further polyamide-forming aliphatic monomers, which have glass transition temperatures of at least 175.degree. C., their blends and alloys, along with the molded articles that can be produced from them and a process for their preparation are proposed.Type: GrantFiled: November 9, 1995Date of Patent: November 4, 1997Assignee: EMS-Inventa AGInventor: Phil Hans Dallas Torre
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Patent number: 5674973Abstract: A process for the continuous production of polyamides from a mixture of at least one lactam and water and, if required, other monomer units and/or conventional additives and fillers under polyamide-forming conditions, where the mixture of the starting materials is heated in liquid phase in a first reaction zone until a conversion of at least 70% is reached, and undergoes adiabatic decompression and further polymerization in another reaction zone, wherein, in the first reaction zone, 0.5-7% by weight of water are employed, the temperature is increased to the range from 220.degree. to 310.degree. C., and polymerization is carried out until a conversion of at least 85% is reached and, in the second reaction zone, after the decompression further polymerization is carried out in the range from 215.degree. to 300.degree. C. without heat input.Type: GrantFiled: December 28, 1995Date of Patent: October 7, 1997Assignee: BASF AktiengesellschaftInventors: Gunter Pipper, Andreas Kleinke, Peter Hildenbrand
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Patent number: 5674974Abstract: The invention provides a continuous process for the preparation of polyamides, equipment in which the polymerization process can be conducted, and process control methods for said polymerization process.Type: GrantFiled: November 23, 1994Date of Patent: October 7, 1997Assignee: E. I. Du Pont de Nemours and CompanyInventors: Ann Marion Brearley, James Joseph Lang, Ernest Keith Andrew Marchildon
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Patent number: 5672677Abstract: A polyamide hot melt adhesive is provided. It comprises the polyamide condensation product of substantially equivalent quantities of (a) an acid component consisting essentially of one or more polymeric fatty acids and one or more dicarboxylic acids and (b) an amine component consisting essentially of (i) two or more non-cyclic aliphatic diamines and (ii) one or more amine-terminated polyglycol diamines. The amine component is substantially free of piperazine-containing polyamines. The adhesive has an open time of at least 120 seconds. Preferred non-cyclic aliphatic diamines are ethylenediamine and 1,6-diaminohexane, preferably present in about equimolar amounts. The composition may further comprise an aromatic sulfonamide plasticizer. The adhesive is particularly useful for spraying applications.Type: GrantFiled: January 12, 1996Date of Patent: September 30, 1997Assignee: The Dexter CorporationInventors: Paul L. Morganelli, Douglas E. Frost
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Patent number: 5670608Abstract: A polyamide (9-T polyamide) comprising (a) 60 to 100 mole of terephthalic acid and (b) a diamine component comprising 60 to 100 mole % of 1,9-nonanediamine, said polyamide having an intrinsic viscosity ?.eta.! as determined by measurement in concentrated sulfuric acid at 30.degree. C. of 0.6 to 2.0 dl/g and having at least 10% of terminal groups thereof blocked. Another polyamide (9M-T polyamide) comprises a dicarboxylic acid component (a) comprising 60 to 100 mole % of terephthalic acid and a diamine component (b) comprising 60 to 100 mole % of 1,9-nonanediamine and 2-methyl-1,8octanediamine, the molar ratio between said 1,9 nonanediamine and said 2-methyl-1,8-octanediamine being in a range of 60:40 to 99:1, said polyamide having an intrinsic viscosity ?.eta.! as determined by measurement in concentrated sulfuric acid at 30.degree. C. of 0.4 to 3.0 dl/g.Type: GrantFiled: December 22, 1994Date of Patent: September 23, 1997Assignee: Kuraray Co., Ltd.Inventors: Hideaki Oka, Tsugunori Kashimura, Shinichi Yokota, Hiroshi Hayashihara
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Patent number: 5665854Abstract: A low temperature process for polymerizing nylon monomers to freely flowing polymers is disclosed. The polymerization process is carried out at lower than conventional polymerization temperatures and produces a freely flowing polymer without thermal degradation.Type: GrantFiled: March 24, 1995Date of Patent: September 9, 1997Assignee: E. I. Du Pont de Nemours and CompanyInventors: Leonard Edward Raymond Kosinski, Richard Robert Soelch
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Patent number: 5663286Abstract: This invention relates to a nonwoven web comprising a water soluble polyamide and articles constructed therefrom. The water soluble polyamide may be used alone or in combination with conventional thermoplastic web forming materials such as water insoluble polyethylene, polypropylene, polyester and polyamide. The water soluble polyamide may also be combined with biodegradable or selectively dispersible material to form nonwoven webs having various combinations of properties. Such water soluble webs have utility in the manufacture of disposable absorbent articles such as disposable diapers, feminine napkins, incontinent products and cellulosic articles such as tissues and towels, as well as for water soluble heat fusible webs for the textile industry.Type: GrantFiled: November 9, 1995Date of Patent: September 2, 1997Assignee: H.B. Fuller Licensing and Financing, Inc.Inventors: Sharf U. Ahmed, Greg J. Van Lith
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Patent number: 5663284Abstract: A copolymerized polyamide, comprising amide bonds formed by an aliphatic diamine with 4 to 14 carbon atoms and terephthalic acid, with the existence ratios of distributed respectively adjacent amide bonds satisfying the following formulae (A) and (B), and with the half-crystallization time satisfying the following formula (C).0.9.ltoreq.[XY]obs./[XY]calcd.<1.1 (A)0.9.ltoreq.[XX]obs./[XX]calcd.<1.1 (B)wherein X stands for an amide bond formed by an aliphatic diamine with 4 to 14 carbon atoms and terephthalic acid, and Y stands for any other amide bond than X. [XY] refers to the rate at which X and Y are adjacent to each other among all the amide bonds in the polymer structure, and [XX] refers to the rate at which X and X are adjacent to each other among all the amide bonds in the polymer structure. [XY] calcd. and [XX] calcd. are respectively the values of [XY] and [XX] calculated on the assumption that X and Y amide bonds are distributed statistically at random, and [XY] obs. and [XX] obs.Type: GrantFiled: August 17, 1995Date of Patent: September 2, 1997Assignee: Toray Industries, Inc.Inventors: Kazuhiko Kominami, Tooru Nishimura, Kazuhiko Kobayashi, Shoji Yamamoto
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Patent number: 5656717Abstract: A process for the copolymerization of (1) a carboxylic acid comprising terephthalic acid and mixtures thereof with isophthalic acid with (2) a mixture of hexamethylene diamine and 2-methyl pentamethylene diamine. The pressure in the polymerization process is maintained at at least about 2.15 MPa for a period of at least about 40 minutes so that the resultant copolyamide, when annealed, has less than 1% by weight based on the total weight of the copolyamide of fractions having melting points greater than 320.degree. C. Use of lower pressures and times tends to result in formation of a high melting fraction.Type: GrantFiled: June 8, 1994Date of Patent: August 12, 1997Assignee: Du Pont Canada Inc.Inventor: Christian Leboeuf
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Patent number: 5612446Abstract: The invention relates to a barrier layer resisting the transmission of oxygen for multi-layer barrier film characterized in that it is made of a transparent copolyamide comprising three components. The first component is hexamethylenediamine and adipic acid. The second component is hexamethylenediamine and azelaic acid, hexamethylenediamine and sebacic acid, and mixtures thereof. The third component is hexamethylene-diamine and isophthalic acid, hexamethylenediamine and terephthalic acid, and mixtures thereof. The total of all components is 100 mol %, and the ratio of the barrier effects in the barrier layer with respect to carbon dioxide and oxygen is at least 3:1.Type: GrantFiled: March 24, 1994Date of Patent: March 18, 1997Assignee: EMS-Inventa AGInventors: Ulrich Presenz, Manfred Hewel
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Patent number: 5612449Abstract: A nonlinear optical material composed of a polyimide obtained from a diamine and/or a diacid anhydride or dithioacid anhydride substituted by a portion having a nonlinear optical effect or of molecules having a benzocyclobutene structure substituted at the portions having an nonlinear linear optical effect.Type: GrantFiled: June 5, 1995Date of Patent: March 18, 1997Assignee: Fujitsu LimitedInventors: Wataru Sotoyama, Satoshi Tatsuura, Tetsuzo Yoshimura, Azuma Matsuura, Tomoaki Hayano
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Patent number: 5599623Abstract: An aramid composition consisting essentially of repeat units derived from p-phenylenediamine, terephthalic acid, 3,3'-bibenzoic acid, and optionally chloroterephthalic acid, is disclosed. The aramids are especially useful for fibers, which after drawing usually have enhanced tensile moduli and strengths, which makes them especially useful in ropes and cables, and in composites.Type: GrantFiled: January 16, 1996Date of Patent: February 4, 1997Assignee: E. I. Du Pont de Nemours and CompanyInventor: Beverly J. Selle
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Patent number: 5599899Abstract: A class of rigid rod and latter polymers having light emitting capability is provided. Included in this class of polymers are those having novel repeating structural units. These rigid rod and ladder polymers are employed in light emitting diodes.Type: GrantFiled: November 1, 1993Date of Patent: February 4, 1997Assignee: Research Corporation Technologies, Inc.Inventors: Samson A. Jenekhe, John A. Osaheni
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Patent number: 5591495Abstract: Copolyamide barrier layers which are durable hot-water stable and transparent. The copolyamide is amorphous and partially aromatic, and comprises(a) 50 molar parts of substituted or unsubstituted aromatic dicarboxylic acids which are replaced by up to 60% by weight of at least one additional dicarboxylic acid selected from the group consisting of cycloaliphatic dicarboxylic acids having 8 to 24 carbon atoms, araliphatic dicarboxylic acids having 8 to 18 carbon atoms, and mixtures thereof, and (b) 50 molar parts of hexamethylene diamine, which is replaced by up to 60% by weight of at least one additional diamine, selected from the group consisting of substituted or unsubstituted aliphatic diamines having 4 to 20 carbon atoms, substituted cycloaliphatic diamines having 6 to 24 carbon atoms, araliphatic diamines having 8 to 18 carbon atoms, and mixtures thereof,the acid groups and amino groups being present substantially in equimolar proportions.Type: GrantFiled: June 7, 1995Date of Patent: January 7, 1997Assignee: EMS-INVENTA AGInventors: Hans D. Torre, Manfred Hewel
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Patent number: 5587447Abstract: A method for producing a copolyamide, which comprises (1) heating either one dicarboxylic acid selected from the group consisting of adipic acid and a mixture containing 40 mol % or more of adipic acid to a temperature higher than the melting point of adipic acid but lower than a temperature lower by 30.degree. C. than the melting point of the resulting copolyamide, (2) dropping a diamine comprising paraxylylene diamine and metaxylylene diamine into the heated dicarboxylic acid before a conversion of the dicarboxylic acid reaches 90 mol %, (3) stopping dropping of the diamine before the conversion of the dicarboxylic acid reaches 90 mol %, and dropping metaxylylene diamine or a diamine mixture of metaxylylene diamine and paraxylylene diamine in place of the diamine until a molar ratio of the total of the diamines to the total of the dicarboxylic acids becomes 0.97 to 1.03, and (4) heating a reaction system to a temperature higher than a temperature lower by 30.degree. C.Type: GrantFiled: April 5, 1995Date of Patent: December 24, 1996Assignee: Mitsubishi Gas Chemical Co., Inc.Inventors: Masahiro Harada, Yasuo Inaba
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Patent number: 5576415Abstract: There are disclosed a method for drying and a method for solid-phase polymerizing a crystallizable polyamide being in an amorphous state which comprises regulating the moisture concentration in the polyamide at its glass transition temperature to at least 0.15% by weight as determined by Karl Fisher titration; heating the polyamide thus regulated at a pressure of at least one arm without reducing the moisture to crystallize the same up to a crystallinity of at least 15% and; further heating the polyamide thus crystallized at a temperature lower than its melting point under reduced pressure with a batchwise heating apparatus.Type: GrantFiled: August 7, 1995Date of Patent: November 19, 1996Assignee: Mitsubishi Gas Chemical Company, Inc.Inventor: Kazumi Tanaka
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Patent number: 5576417Abstract: There is disclosed a method for producing aromatic polyamides represented by the following formula (III), which comprises reacting an aromatic dihalogen compound represented by the following formula (I) with a diamine compound represented by the following formula (II) in the presence of cobalt/phosphine complex and a basic substance under carbon monoxide atmosphere:X.sub.1 --Ar--X.sub.2 formula (I)wherein Ar represents an aromatic residue and X.sub.1 and X.sub.2 each represent a bromine or iodine atom,H.sub.2 N--R--NH.sub.2 formula (II)wherein R represents a divalent hydrocarbon group, andformula (III) ##STR1## wherein Ar and R each have the same meaning as the above, and n is a positive integer.Type: GrantFiled: September 13, 1994Date of Patent: November 19, 1996Assignee: Director-General of Agency of Industrial Science and TechnologyInventors: Kazuhiko Takeuchi, Yoshihiro Kubota, Takaaki Hanaoka, Takehiko Matsuzaki, Yoshihiro Sugi, Tatsuya Eto, Tokio Hagiwara, Tadashi Narita
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Patent number: 5569734Abstract: Curable mixtures comprising(a) an epoxy compound having on average more than one epoxy group per molecule,(b) a metal complex salt of formula IM(L).sub.a X'.sub.b X".sub.c .cndot.dY (I),whereinM is a cation of a transition metal,L is a Lewis base,a is a number from 2 to 6,X' is an anion of an acid radical,X" is an cation of an acid radical differing from X'b is 0 or a number which, together with the number c, which is greater than 0, corresponds to the valency of the cation of the transition metal,Y is a solvent molecule, andd is 0 or a number from 0 to 5, and,as optional component(c) a hardener for epoxy resins,are distinguished by good solubility of the metal salt in the epoxy resin and achieve uniform crosslinking during the curing of the epoxy resin.Type: GrantFiled: May 3, 1995Date of Patent: October 29, 1996Assignee: Ciba-Geigy CorporationInventors: Klaus Petschel, Uwe Weinzierl
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Patent number: 5550208Abstract: A process for preparing condensation polymers comprises forming a dispersion of a reaction mixture in a continuous vapor phase, maintaining the dispersion while passing it through a reaction zone, heating the dispersion in the reaction zone to polymerize reactants in the reaction mixture and form a polycondensate.Type: GrantFiled: February 10, 1995Date of Patent: August 27, 1996Assignee: Amoco CorporationInventors: Joel A. Richardson, Wassily Poppe, Benjamin A. Bolton, Edward E. Paschke
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Patent number: 5545833Abstract: A polymer including as integral parts of polymer chain, amide groups of the formula ##STR1## and phosphinic acid-salt groups of the formula ##STR2## wherein a and b are both greater than or equal to 2 and M is selected from the group of metal cations where n=1 or n=2.The polymer of the present invention is particularly useful in forming stain-resistant fibers for carpet pile.Type: GrantFiled: May 30, 1995Date of Patent: August 13, 1996Assignee: Monsanto CompanyInventor: John W. Stoddard
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Patent number: 5516882Abstract: A process for the preparation of a copolyamide involving copolymerization of (1) a carboxylic acid of terephthalic acid or a terephthalic acid/isophthalic acid mixture with (2) a mixture of hexamethylene diamine and 2-methyl pentamethylene diamine. The combined amount of isophthalic acid and 2-methyl pentamethylene diamine is controlled so that the resultant copolyamide exhibits few, if any, high melting fractions.Type: GrantFiled: September 6, 1994Date of Patent: May 14, 1996Assignee: E. I. du Pont de Nemours and CompanyInventor: Richard R. Soelch
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Patent number: 5503936Abstract: N-Alkyl-N'-aryl-p-phenylenediamines, when added at 2.5 to 12.5% by weight, based on the total weight of the epoxy resin and hardener, cause the epoxy resin after curing to exhibit substantial increases in physical properties, such as strength, stiffness, toughness and hot/wet properties, compared to the properties of the cured, but unmodified epoxy resin.Type: GrantFiled: January 12, 1995Date of Patent: April 2, 1996Assignee: Ciba-Geigy CorporationInventor: Yefim Blyakhman
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Patent number: 5504185Abstract: A process for the production of a polyamide, which comprises polycondensing adipic acid prepared by nitric acid oxidation and containing 1 ppm by weight or less of a free mineral acid as an impurity with a diamine represented by formula (1)H.sub.2 N--CH.sub.2 --R--CH.sub.2 --NH.sub.2 . . . (1)wherein R denotes a linear or branched alkylene group having 2 to 10 carbon atoms, a m-phenylene group, a p-phenylene group, a 1,3-cyclohexylene group or a 1,4-cyclohexylene group; a polyamide produced by said process; and a film or sheet made of the above polyamide.Type: GrantFiled: October 27, 1993Date of Patent: April 2, 1996Assignee: Mitsubishi Gas Chemical Company, Inc.Inventors: Tsukasa Toki, Masahiro Harada, Yasuo Inaba
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Patent number: 5504184Abstract: Xanthene polyesters and polyamides are provided resulting from the reaction of alkylene, cycloaliphatic or aromatic diols or organo diamines with xanthene dicarboxylic esters or xanthene dicarboxylic acid halides. These amorphous, or crystalline film forming, high performance thermoplastics which are useful in automotive applications, and include copolymers and blends of such xanthene polymers.Type: GrantFiled: June 6, 1995Date of Patent: April 2, 1996Assignee: General Electric CompanyInventors: Andrew J. Caruso, Julia L. Lee
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Patent number: 5502155Abstract: A process for the manufacture of a partially aromatic polyamide is disclosed. The process comprises the polymerization stages of, in sequence, feeding to a reactor a slurry of at least one aromatic dicarboxylic acid and at least one aliphatic diamine, then with the incremental addition of water and in the presence of 0.05 to 2% by weight of a monocarboxylic acid, heating the slurry to a temperature of at least 270.degree. C. while maintaining a pressure of at least 1.2 MPa. The preferred dicarboxylic acid is 2,6 naphthalene dicarboxylic acid. The polyamides may be used in the manufacture of products using melt processing techniques.Type: GrantFiled: March 3, 1994Date of Patent: March 26, 1996Assignee: Du Pont Canada Inc.Inventor: Howard C. Ng
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Patent number: 5498784Abstract: Alcohol-soluble aromatic heterocyclic copolymers having repeating units of the formula: ##STR1## wherein x has a value of 0.05 to 0.50 and y has a value of 1.0-x. These copolymers are useful in the preparation of organic/inorganic hybrid materials having transparency which comprise the sol-gel derived, hydrolytically condensed reaction product of a metal alkoxide of the formula M(OR).sub.w wherein R is a lower alkyl group, M is Si, Ti, Al or a mixture thereof, and w is the valence value of M, and the above copolymer.Type: GrantFiled: February 21, 1995Date of Patent: March 12, 1996Assignee: The United States of America as represented by the Secretary of the Air ForceInventors: Fred E. Arnold, Jom P. Chen
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Patent number: 5492996Abstract: Alcohol-soluble aromatic heterocyclic polymers having repeating units of the formula: ##STR1## wherein X is --O-- or --S--, and R is selected from the group consisting of: ##STR2## and R' is selected from the group consisting of alkyl having 1 to 5 carbon atoms, alkaryl having 7 to 12 carbon atoms, aralkyl having 7 to 12 carbon atoms and substituted aromatic having 1 to 3 substituent groups.The alcohol-soluble polymers may be used for fabricating organic/inorganic hybrid composites with metal alkoxides M(OQ).sub.v, wherein M is Si, Ti, Al or the like and Q is a lower alkyl group. These polymers can also be used to coat materials or substrates which are susceptible to attack by highly corrosive acids. On drying, the ionic bond between the trialkylamine and the sulfo group is broken and the polymer reverts to the parent structure, thereby leaving a polymer coating. Yet further, the original amine can be exchanged with a less volatile amine or an amine having a desired functionality.Type: GrantFiled: February 21, 1995Date of Patent: February 20, 1996Assignee: The United States of America as represented by the Secretary of the Air ForceInventors: Thuy D. Dang, Jom P. Chen, Fred E. Arnold
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Patent number: 5493005Abstract: Alcohol-soluble, aromatic heterocyclic copolymers having repeating units of the formula: ##STR1## wherein x has a value of 0.10 to 0.90 and y has a value of 1.0-x. These copolymers are useful in the preparation of organic/inorganic hybrid materials having transparency which comprise the sol-gel derived, hydrolytically condensed reaction product of a metal alkoxide of the formula M(OR).sub.w wherein R is a lower alkyl group, M is Si, Ti, Al or a mixture thereof, and w is the valence value of M, and the above copolymer.Type: GrantFiled: February 21, 1995Date of Patent: February 20, 1996Assignee: The United States of America as represented by the Secretary of the Air ForceInventors: Fred E. Arnold, Jom P. Chen
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Patent number: 5470921Abstract: A synthetic polyamide of formula I and its salts ##STR1## in which each R.sub.1 independently is selected from hydrogen, carboxyl, amino or a group of formula .alpha.-A.sub.1 -R.sub.10 (.alpha.)where A, is a bridging group and R.sub.10 is a sterically hindered amine group;each R.sub.2 independently is hydrogen or a group of formula .alpha.A is a bridging group of the formula ##STR2## is 0 or 1; R.sub.3 is hydrogen, C.sub.1-12 alkyl or is a significance of R.sub.10 ;R.sub.5 is hydrogen or C.sub.1-12 alkylR.sub.4 is a significance of R.sub.10 or a group of formula .alpha.; andp is an integer from 5 to 200;with the proviso that the compound of formula I contains 1-400 sterically hindered amine groups.Type: GrantFiled: May 20, 1994Date of Patent: November 28, 1995Assignee: Sandoz Ltd.Inventors: Bansi L. Kaul, Angelos-Elie Vougioukas, Jurgen Goldmann
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Patent number: 5468554Abstract: Shaped articles, such as fibers, formed of a polyamide formed by salt-blending the polyamide precursor salt with a cationic dye modifier, such as the dimethyl ester of 5-sulfoisophthalic acid, followed by polymerization, are rendered resistant to staining by acid dyes at ambient conditions either by adding an acid dye to the polymer melt or by dyeing with an acid dye from an acid dyebath at pH 2 to 7 and 60.degree. to 100.degree. C. so that the shaped article contains from at least 0.0048 and preferably at least 0.0096 wt % of an acid dyestuff. In a preferred aspect of the invention, the shaped articles are oriented, crimped, heat-set fibers for use as the facing in carpets.Type: GrantFiled: June 15, 1994Date of Patent: November 21, 1995Assignee: E. I. Du Pont de Nemours and CompanyInventor: William T. Windley
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Patent number: 5461137Abstract: A method for forming a homogeneous, concentrated, prepolymer composition, and a method of using the concentrated prepolymer composition to uniformly coat fibers is described. The prepolymer mixture is formed by dissolving a dialkyl, trialkyl, or tetraalkylester of biphenyltetracarboxylic acid in a solvent comprising ethyl acetate and methanol in a molar ratio of from about 1:3 to about 1:60, to form an ester solution. Diamine and end cap compound are added to the ester solution to form a monomer mixture solution. The end cap compound is a divalent compound characterized by (i) at least one unsaturated moiety, (ii) capable of reacting with the diamine or the ester to form an end cap radical that precludes further reaction of the diamine with the ester, and (iii) capable of undergoing addition polymerization. A portion of the solvent is evaporated from the monomer solution to form the substantially homogeneous, concentrated, prepolymer composition.Type: GrantFiled: March 6, 1995Date of Patent: October 24, 1995Assignee: TRW Inc.Inventors: Tito T. Serafini, Paul G. Cheng, Ward F. Wright
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Patent number: 5461138Abstract: A method for forming a homogeneous, concentrated, prepolymer composition, and a method of using the concentrated prepolymer composition to uniformly coat fibers is described. The prepolymer mixture is formed by dissolving a dialkyl, trialkyl, or tetraalkylester of biphenyltetracarboxylic acid in a solvent comprising ethyl acetate and methanol in a molar ratio of from about 1:3 to about 1:60, to form an ester solution. Diamine and end cap compound are added to the ester solution to form a monomer mixture solution. The end cap compound is a divalent compound characterized by (i) at least one unsaturated moiety, (ii) capable of reacting with the diamine or the ester to form an end cap radical that precludes further reaction of the diamine with the ester, and (iii) capable of undergoing addition polymerization. A portion of the solvent is evaporated from the monomer solution to form the substantially homogeneous, concentrated, prepolymer composition.Type: GrantFiled: March 6, 1995Date of Patent: October 24, 1995Assignee: TRW Inc.Inventors: Tito T. Serafini, Paul G. Cheng, Ward F. Wright
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Patent number: 5440006Abstract: Semi-crystalline, semi-aromatic copolyamides derived from terephthalic acid and mixtures comprising an alkylpentamethylene diamine and hexamethylenediamine by a process including thermal polycondensation in a closed system of the autoclave type.Type: GrantFiled: March 16, 1994Date of Patent: August 8, 1995Assignee: Rhone-Poulenc ChimieInventors: Pierre-Yves Lahary, Jean Coquard
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Patent number: 5422420Abstract: Polyamides and polyamide fibers having a major proportion of hexamethyleneadipamide units and minor proportions of at least two other amide units, one of those other amide units being those of 2-methylpentamethylenediamine are disclosed.Type: GrantFiled: May 19, 1993Date of Patent: June 6, 1995Assignee: E. I. Du Pont de Nemours and CompanyInventor: Ketan G. Shridharani
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Patent number: 5417792Abstract: A pretreatment process for fabricating polyimide composites from prepreg, thereby reducing the formation of void producing or blister producing gases at elevated temperatures during a subsequent post cure cycle. The pretreatment process includes heating a prepreg to an elevated temperature and holding at said temperature for a period of time sufficient to achieve complete imidization of the prepreg but such that the material is still processable. Processes are also disclosed for the subsequent cure of the prepreg to form thermoplastic high temperature fiber reinforced composites.Type: GrantFiled: August 31, 1989Date of Patent: May 23, 1995Assignee: United Technologies CorporationInventors: Daniel A. Scola, John H. Vontell
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Patent number: 5416189Abstract: Process for the synthesis of polyamides by polycondensation in a closed reactor of one or a number of dicarboxylic acids with a diamine compound containing not less than 60 mol % of-m-xylyenediamine, in which all the amount of diamine compound stoichiometrically necessary for the polycondensation reaction is quickly brought into contact with the molten acid, the temperature of the reaction mixture is raised to a value greater than the melting point of the polyamide produced, the pressure is only allowed to rise to a value sufficient to prevent solidification of the reaction mixture and a substantial loss of diamine compound and, at the end of the reaction, the pressure of the reaction mixture is reduced and the polyamide formed is recovered.Type: GrantFiled: November 3, 1993Date of Patent: May 16, 1995Assignee: Solvay (Societe Anonyme)Inventors: Eric Vandevijver, Fernand Gauthy, Ardechir Momtaz
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Patent number: 5399663Abstract: An amine terminated random copolymer containing ethylene oxy/propylene oxy segments may be reacted with hexamethylene diamine and adipic acid monomers to make improved poly(etheramide) segmented block copolymers. Ordinarily, poly(propylene glycol) diamines tend to phase separate under these conditions and polyamide-6,6 could not be so modified. The resultant poly(etheramide) segmented block copolymer has improved impact performance, reduced modulus and lower glass transition as contrasted with the non-modified polyamide-6,6.Type: GrantFiled: April 15, 1993Date of Patent: March 21, 1995Assignee: Huntsman CorporationInventor: Richard J. Clark, II
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Patent number: 5393849Abstract: A thermosetting composition comprising the combination of an unsaturated polyester resin and a polyamino compound having a plurality of secondary or primary amino moieties.Type: GrantFiled: October 19, 1993Date of Patent: February 28, 1995Assignee: Georgia-Pacific Resins, Inc.Inventors: Ramji Srinivasan, Ted M. McVay, David A. Hutchings