Aryl Ring-containing Reactant Patents (Class 528/347)
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Patent number: 5391703Abstract: An improved process for preparing pigmented drawn polyamide fibers is disclosed, the improvement being the improved processability obtained from the use as a carrier polymer for the pigment dispersion of a random copolymer of hexamethlyene diamine, isophthaiic acid and terephthalic acid.Type: GrantFiled: May 19, 1993Date of Patent: February 21, 1995Assignee: E. I. Du Pont de Nemours and CompanyInventor: Perry H. Lin
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Patent number: 5378800Abstract: A partially crystalline copolyamide formed from an aromatic carboxylic acid that is terephthalic acid or a mixture of terephthalic acid and isophthalic acid containing less than 40% of isophthalic acid, and an aliphatic diamine that is a mixture of hexamethylene diamine and 2-methyl pentamethylene diamine. The aliphatic diamine is at least 40%, molar basis, of hexamethylene diamine and the amount of isophthalic acid plus 2-methyl pentamethylene diamine is in the range of 15-35%, molar basis, of the total amount of aromatic carboxylic acid and aliphatic diamine. The copolyamides have a melting point of 280.degree.-330.degree. C. The copolyamide preferably has a heat of fusion of greater than 17 J/g. The copolyamide may be moulded into articles, spun into fibres or formed into films, and used in a wide variety of end-uses especially where high temperature properties are required.Type: GrantFiled: August 12, 1992Date of Patent: January 3, 1995Assignees: E. I. Du Pont de Nemours and Company, Du Pont Canada Inc.Inventors: Steven L. Mok, Rolando U. Pagilagan
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Patent number: 5362846Abstract: Copolyamides having high crystallinity over the whole composition range, a melting enthalpy .DELTA.H>3.5 cal/g and a melting point T.sub.M higher than 270.degree. C. and articles manufactured therefrom are disclosed, said copolyamides comprising, by moles:a) 1 to 99% of a unit A of formula--(NH--R--NHCO--AR.sub.1 --CO)--in which R is a --(CH.sub.2).sub.n --carbon chain where n is coma) between 4 and 20, and AR.sub.1 is the residue from the condensation of terephthalic acid and/or of the diester form thereof; andb) 99 to 1% of a unit B of formula--(NH--R--NHCO--AR.sub.2 --CO)--in which R is the same carbon chain as in unit A and AR.sub.2 is the residue from condensation of naphthalene-2,6-dicarboxylic acid and/or the diester form thereof.Type: GrantFiled: June 11, 1993Date of Patent: November 8, 1994Assignee: Elf Atochem S.A.Inventor: Jean-Marc Sage
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Patent number: 5360891Abstract: A colorless and transparent, amorphously processable polyamide molding composition which has a good resistance to stress cracking and good impact strength and is resistant to alcohols, esters, ketones, fuels and boiling water, comprising the reaction product ofI. a linear aliphatic dicarboxylic acid;II.a) 35-60 mol % of trans,trans-bis(4-aminocyclohexyl)-methane; andII.b) 65-40 mol % of other aliphatic, cycloaliphatic, araliphatic or aromatic diaminesas starting components, the molar ratio of components I and II varying in the range from 0.95 to 1.05:1, preferably 0.98 to 1.02:1.The polyamide molding composition is particularly suitable for use for spectacle frames, apparatus inspection windows and covers and lamp covers.Type: GrantFiled: December 21, 1993Date of Patent: November 1, 1994Assignee: Huels AktiengesellschaftInventors: Markus Wenzel, Georg Oenbrink, Eva von der Bey-Dahm
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Patent number: 5349044Abstract: A higher order polyamide monofilament suture exhibits improved properties such as greater resistance to creep, greater knot security and greater chemical stability in aqueous environments.Type: GrantFiled: September 24, 1993Date of Patent: September 20, 1994Assignee: United States Surgical CorporationInventors: Cheng-Kung Liu, John C. Brewer
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Patent number: 5342918Abstract: Described are carboxyl-terminated polyetheramides of the formula: ##STR1## where R is a moiety from an alcohol or hydroxy compound having a valence of k; R' is independently hydrogen or lower alkyl from 1 to 4 carbon atoms; R" is independently a straight or branched alkylene or aromatic moiety averaging from about 2 to 36 carbon atoms; x averages from about 2 to 100; z averages from about 20 to about 250; k averages from about 1 to 3; m is 0 or 1; and p is independently 5 to 11. Because the carboxyl-terminated polyetheramides are all carboxyl-terminated, they do not gel. They are expected to have good impact strength as well as differing solubilities depending on the polyetheramine incorporated.Type: GrantFiled: April 30, 1993Date of Patent: August 30, 1994Assignee: Texaco Chemical CompanyInventors: Richele T. Howelton, George P. Speranza
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Patent number: 5324812Abstract: Water soluble polyamides may be produced by reacting two different dicarboxylic acids with at least one low molecular weight poly(alkylene glycol) diamine and at least one relatively high molecular weight polyoxyalkylene diamine. One dicarboxylic acid may be of low molecular weight, such as adipic acid and the other of relatively high molecular weight such as C.sub.36 dimer acid. In one embodiment, some dimer acid proportion is preferred. The poly(alkylene glycol) diamine may include triethylene glycol diamine and tetraethylene glycol diamine. The polyoxyalkylene diamine should have at least some ethylene oxide residue therein; for example it may be a polyoxyethylene/polyoxypropylene diamine. The resulting polyamides have a desirable combination of properties, including high strength with water solubility, the latter making the materials easier to work with and very useful.Type: GrantFiled: April 1, 1993Date of Patent: June 28, 1994Assignee: Texaco Chemical CompanyInventors: George P. Speranza, Christopher S. Henkee
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Patent number: 5322917Abstract: This invention concerns novel fluorine-containing diamines, polyamides and polyimides. The compounds are useful in the formation of moisture resistant films, fibers and shaped articles.Type: GrantFiled: November 9, 1993Date of Patent: June 21, 1994Assignee: E. I. Du Pont de Nemours and CompanyInventors: Brian C. Auman, Andrew E. Feiring
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Patent number: 5322923Abstract: The present invention relates to semi-crystalline, semi-aromatic copolyamides, derived from terephthalic acid and mixtures comprising an alkylpentamethylenediamine and hexamethylenediamine.Type: GrantFiled: November 2, 1992Date of Patent: June 21, 1994Assignee: Rhone-Poulenc ChimieInventors: Pierre-Yves Lahary, Jean Coquard
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Patent number: 5321120Abstract: Copolyamide adhesive compositions have a diamine component and a dicarboxylic acid component. The diamine component includes the reaction residues of at least two diamines selected from non-cyclic aliphatic diamines, cycloaliphatic diamines, and aromatic diamines. The dicarboxylic acid component includes the reaction residues of at least two dicarboxylic acids selected from non-cyclic aliphatic dicarboxylic acids, cycloaliphatic dicarboxylic acids, and aromatic dicarboxylic acids. One of the residues is mono-alkyl branched asymmetric. The composition is free from aliphatic omega aminocarboxylic acids or lactams having 12 carbon atoms or less. When one of the dicarboxylic acids is a polymerized fatty acid, the diamine component does not contain a cycloaliphatic diamine.Type: GrantFiled: January 26, 1993Date of Patent: June 14, 1994Assignee: Bostik, Inc.Inventor: Eugene G. Sommerfeld
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Patent number: 5321119Abstract: A thermoplastic polyamide comprising a copolyamide which is the reaction product of a hexamethylene diamine unsubstituted or substituted with at least one alkyl group, and a bis(4-aminocyclohexyl) alkane which is substituted adjacent to the amino groups, and a dicarboxylic acid. Molded bodies made therefrom have high rigidity and tensile strength over a broad temperature range, low water uptake, high dimensional stability, low permeability to oxygen, and high distortion temperatures. They are particularly suitable for injection molding and extrusion particularly when they are modified to improved impact strength, especially for the preparation of thin walled or large surface area shapes.Type: GrantFiled: March 8, 1993Date of Patent: June 14, 1994Assignee: Ems-Inventa AGInventors: Hans D. Torre, Manfred Hoppe
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Patent number: 5310860Abstract: A process for the manufacture of polyamides consisting essentially of the stages of:(i) reacting 10 to 90% by weight of the aliphatic and/or cycloaliphatic and/or aromatic-aliphatic diamines (c) with a lactam and/or corresponding amino acid (a) or the substantially stoichiometric combination of one or more aliphatic diamine(s) and of one or more dicarboxylic aliphatic acid(s) and with the aromatic diacid (b); and(ii) reacting the remainder of the aliphatic and/or cycloaliphatic and/or aromatic-aliphatic diamine (c) with the oligomer produced in stage (i) in one or more substages.Type: GrantFiled: December 30, 1992Date of Patent: May 10, 1994Assignee: Elf Atochem, S.A.Inventors: Philippe Maj, Jean-Marc Sage, Philippe Blondel, Didier Judas
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Patent number: 5302691Abstract: A process for the copolymerization of (1) a carboxylic acid consisting of terephthalic acid and mixtures thereof with isophthalic acid 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, 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. Preferably, the combined amount of isophthalic acid and 2-methyl pentamethylene diamine is greater than 27.5%, molar basis, of the total amount of acid and diamine.Type: GrantFiled: May 19, 1992Date of Patent: April 12, 1994Assignee: Du Pont Canada Inc.Inventor: Richard R. Soelch
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Patent number: 5298597Abstract: A polyamide/copolyamide catalyst composition comprising a primary catalyst which comprises an alkali metal hypophosphite or an alkali-earth metal hypophosphite, and a cocatalyst which comprises an organic salt or an inorganic salt. The catalyst composition of this invention is most useful when used in conjunction with the reactive extrusion technology which requires a very fast polymerization rate to take full advantage of this evolving technology.Type: GrantFiled: September 18, 1992Date of Patent: March 29, 1994Assignee: Industrial Technology Research InstituteInventors: Wu-Bin Yuo, Ching-Pei Chen, Jeng-Yue Wu, Mao-Song Lee
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Patent number: 5298595Abstract: Partly aromatic copolyamides contain as essential componentsA) 40-90% by weight of units derived from terephthalic acid and hexamethylenediamine,B) 0-50% by weight of units derived from .epsilon.-caprolactam andC) 0-60% by weight of units derived from adipic acid and hexamethylenediamine,the components B) and/or C) accounting for a total of not less than 10% by weight of the total units and the copolyamide having a triamine content of less than 0.5% by weight.Type: GrantFiled: February 10, 1993Date of Patent: March 29, 1994Assignee: BASF AktiengesellschaftInventors: Horst Reimann, Gunter Pipper, Hans-Peter Weiss, Christoph Plachetta, Eckhard M. Koch
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Patent number: 5298598Abstract: A catalyst composition for the polymerization of polyamide/copolyamide comprising a primary catalyst which comprises an alkali metal hypophosphite or an alkali-earth metal hypophosphite, and an organic phosphite cocatalyst. The catalyst composition of this invention is most useful when used in conjunction with the reactive extrusion technology which requires a very fast polymerization rate to take full advantage of this evolving technology.Type: GrantFiled: September 18, 1992Date of Patent: March 29, 1994Assignee: Industrial Technology Research InstituteInventors: Wu-Bin Yuo, Der-Tarng Su, Jeng-Yue Wu, Mao-Song Lee
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Patent number: 5298531Abstract: A polyimide foam is prepared by heating a mixture comprising an alkyl ester of 4,4'-oxydiphthalic acid and a diamine at a temperature of 60.degree. to 350.degree. C. This foam is elastic and flame-retardant and has an excellent resistance to acid and alkali.Type: GrantFiled: March 3, 1993Date of Patent: March 29, 1994Assignee: Daicel Chemical Industries, Ltd.Inventors: Motoshi Ishikura, Nobuyuki Watanabe
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Patent number: 5290850Abstract: An improved process for melt spinning a pigmented hexamethylene adipamide fiber from a melt blend of a polymer and a colored pigment wherein the polymer is a random interpolyamide or a block polymer having two different difunctional recurring amide-forming moieties other than those which form hexamethylene adipamide is disclosed along with pigmented hexamethylene adipamide polymer fibers having tenacities greater than 7.5 or even 8 grams per denier.Type: GrantFiled: March 5, 1993Date of Patent: March 1, 1994Assignee: E. I. Du Pont de Nemours and CompanyInventors: Ketan G. Shridharani, Peter R. Witt, Perry H. C. Lin, Sundar M. Rao
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Patent number: 5288793Abstract: Fiber- or particulate-filled polyphthalamide molding compositions, wherein the polyphthalamide comprises recurring units obtainable from terephthalic acid, 2,6-naphthalene dicarboxylic acid, aliphatic diamine and, optionally, isophthalic acid, exhibit a desirable combination of thermal, mechanical and solvent resistance properties.Type: GrantFiled: January 2, 1992Date of Patent: February 22, 1994Assignee: Amoco CorporationInventor: Yu-Tsai Chen
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Patent number: 5286839Abstract: Polyphthalamides having a useful combination of thermal and mechanical properties and excellent solvent resistance, particularly to alcohols, comprise recurring aliphatic terephthalamide and 2,6-naphthalene dicarboxylamide units and, optionally, isophthalamide units.Type: GrantFiled: January 2, 1992Date of Patent: February 15, 1994Assignee: Amoco CorporationInventor: Yu-Tsai Chen
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Patent number: 5286838Abstract: Thermotropic liquid crystalline copolyamides comprise: (a) a thermoplastic, aliphatic polyamide, such as nylon-6,6; and (b) a mesogen comprising an amide-linked aromatic group segment which is not completely para-linked (namely, is substantially ortho- or meta-linked or a mixture of ortho- and meta-linked) by an amide linkage to an alkylene amide group contained in the mesogen.Type: GrantFiled: November 12, 1992Date of Patent: February 15, 1994Assignee: Akzo N.V.Inventors: Jan G. Nel, Gert Boven
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Patent number: 5276131Abstract: This invention relates to cyclic diamides that are readily polymerized to form poly(terephthalamides). The resulting poly(terephthalamides) have high crystallinity, high temperature capabilities, dimensional stability, low moisture sensitivity, and solvent and chemical resistance.Type: GrantFiled: June 11, 1992Date of Patent: January 4, 1994Assignee: Allied Signal Inc.Inventors: Murali K. Akkapeddi, Jeffrey H. Glans
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Patent number: 5270437Abstract: Polymers of aromatic diacids and 2-methylpentamethylenediamine are prepared in the presence of formic acid. The formic acid reduces the tendency of the 2-methylpentamethylenediamine to cyclize.Type: GrantFiled: November 13, 1992Date of Patent: December 14, 1993Assignee: E. I. Du Pont de Nemours and CompanyInventor: David N. Marks
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Patent number: 5264544Abstract: Amorphous polyamide compositions are provided which are transparent and have improved glass transition and thermal decomposition temperatures. The polyamide compositions of the present invention can be prepared as the polymeric condensation product of a diamine component comprising neopentyldiamine, and a diacid component comprising an aromatic dicarboxylic acid.Type: GrantFiled: July 15, 1992Date of Patent: November 23, 1993Assignee: Amoco CorporationInventors: Edward E. Paschke, Wassily Poppe, David P. Sinclair
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Patent number: 5248756Abstract: Disclosed is an alternating block copolymer composition useful for enhancing the crystallization of bisphenol-A polycarbonate which comprises the reaction product of a polyoxyalkylene polyamine and poly(ethylene)terephthalate. Also disclosed is a method of synthesizing the alternating block copolymer and a method of using the block copolymer composition in the crystallization of bisphenol-A polycarbonate.Type: GrantFiled: January 22, 1992Date of Patent: September 28, 1993Assignee: Texaco Chemical CompanyInventors: Chih-Chien Hsu, Gerhard K. Guenther, Richele T. Howelton, David E. Bergbreiter, Alan Letton, Pei-Hua Wang
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Patent number: 5247050Abstract: A new class of polymers is provided as well as the monomers used for their preparation. The polymers provided in accordance with practice of the present invention include repeating units comprising one or more quinoline groups, wherein at least a portion of the repeating units includes a hexafluoroisopropylidene (6F) group or a 1-aryl-2,2,2-trifluoroethylidene (3F) group, or both.The hexafluoroisopropylidene group is referred to herein as a "6F" group and has the following structure: ##STR1## The "6F" group includes a tetravalent carbon atom bound to two trifluoromethyl moieties with its other two bonds forming linkages in the polymer chain.the 1-aryl-2,2,2-trifluoroethylidene group is referred to herein as "3F" group and has the following structure: ##STR2## wherein Ar' is an aryl group. The "3F" group comprises a tetravalent carbon atom bound to one trifluoromethyl moiety and one aryl group with its other two bonds forming linkages in the polymer chain.Type: GrantFiled: August 13, 1991Date of Patent: September 21, 1993Assignee: Maxdem IncorporatedInventor: Neil H. Hendricks
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Patent number: 5245005Abstract: A process is disclosed for the production of linear amorphous polyamides which results in polyamides having more amine endgroups than acid endgroups. It comprises condensing an aqueous solution of salts comprising at least one aromatic diacid containing from 7 to 20 carbon atoms and a greater than equimolar amount of at least one aliphatic diamine containing from 4 to 20 carbon atoms.Type: GrantFiled: April 10, 1992Date of Patent: September 14, 1993Assignee: Monsanto CompanyInventors: Chris E. Schwier, Richard D. Chapman, Roger C. Ayotte
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Patent number: 5235029Abstract: There are described copolyamides which are soluble in organic polyamide solvents and contain recurring structural units of the formulae Ia, Ib, Ic and Id or Ia, Ib, Id and Ig or Ia, Ib, Ic, Id and Ig and optionally of the formulae Ie and/or If--OC--Ar.sup.1 --CO-- (Ia),--NH--Ar.sup.2 --NH-- (Ib),--NH--Ar.sup.3 --NH-- (Ic), ##STR1##--OC--R.sup.2 --CO-- (Ie),--NH--R.sup.3 --NH-- (If),--OC--Ar.sup.4 --CO-- (Ig),whereAr.sup.1 and Ar.sup.2 are each independently of the other divalent aromatic radicals whose valence bonds are in the para or a comparable coaxial or parallel position relative to one another,Ar.sup.3 and Ar.sup.4 are each independently of the other divalent radicals whose valence bonds are in the meta or a comparable kinked position relative to one another,R.sup.1 is lower alkyl, lower alkoxy or halogen, andR.sup.2 and R.sup.3 are each independently of the other divalent aliphatic, cycloaliphatic or araliphatic radicals.Type: GrantFiled: January 16, 1992Date of Patent: August 10, 1993Assignee: Hoechst AGInventors: Gunter Keil, Karl Heinrich
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Patent number: 5223196Abstract: An improved process for melt-spinning a pigmented hexamethylene adipamide fiber from a melt blend of a polymer and a colored pigment wherein the polymer is a random interpolyamide or a block polymer having two different difunctional recurring amide-forming moieties other than those which form hexamethylene adipamide is disclosed along with pigmented hexamethylene adipamide polymer fibers having tenacities greater than 7.5 or even 8 grams per denier.Type: GrantFiled: November 20, 1990Date of Patent: June 29, 1993Assignee: E. I. Du Pont de Nemours and CompanyInventors: Ketan G. Shridharani, Peter R. Witt, Perry H. Lin, Sundar M. Rao
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Patent number: 5218082Abstract: Partly aromatic copolyamides contain as essential componentsA) 40-90% by weight of units derived from terephthalic acid and hexamethylenediamine,B) 0-50% by weight of units derived from .epsilon.-caprolactam andC) 0-60% by weight of units derived from adipic acid and hexamethylenediamine,the components B) and/or C) accounting for a total of not less than 10% by weight of the total units and the copolyamide having a triamine content of less than 0.5% by weight.Type: GrantFiled: August 30, 1991Date of Patent: June 8, 1993Assignee: BASF AktiengesellschaftInventors: Horst Reimann, Gunter Pipper, Hans-Peter Weiss, Christoph Plachetta, Eckhard M. Koch
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Patent number: 5216110Abstract: Azole rings, such as oxazole and thiazole rings, can activate an aromatic ring bonded to a leaving group such as a halogen atom so that the aromatic ring will undergo aromatic nucleophilic substitution. The reaction is useful for making ethers, thioethers and amines containing azole rings. In particular, monomers having azole rings, activated aromatic rings with leaving groups and nucleophilic moieties can react under conditions of aromatic nucleophilic displacement to form non-rigid rod PBZ polymers. The non-rigid rod PBZ polymers can be used to form molecular composites with rigid rod PBZ polymers which molecular composites are not substantially phase separated.Type: GrantFiled: January 10, 1992Date of Patent: June 1, 1993Assignee: The Dow Chemical CompanyInventors: Muthiah N. Inbasekaran, Michael J. Mullins
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Patent number: 5196501Abstract: Preparation of specially substituted aromatic polyamides containing structural units of the formula I mentioned and copolyamides containing at least 10 mol % of structural units of the formula I and structural units of the formula II mentioned and their use as orientation layer in liquid crystal display elements and/or liquid crystal switching elements.Type: GrantFiled: December 17, 1991Date of Patent: March 23, 1993Assignee: Hoechst AktiengesellschaftInventors: Hans-Rolf Dubal, Mikio Murakami, Otto Herrmann-Schonherr, Arnold Schneller
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Patent number: 5196509Abstract: In one embodiment this invention provides polymalonamide polymers with side chains which exhibit nonlinear optical response.Type: GrantFiled: March 25, 1991Date of Patent: March 23, 1993Assignee: Hoechst Celanese Corp.Inventor: Diane E. Allen
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Patent number: 5194562Abstract: Azole rings, such as oxazole and thiazole rings, can activate an aromatic ring bonded to a leaving group such as a halogen atom so that the aromatic ring will undergo aromatic nucleophilic substitution. The reaction is useful for making ethers, thioethers and amines containing azole rings. In particular, monomers having azole rings, activated aromatic rings with leaving groups and nucleophilic moieties can react under conditions of aromatic nucleophilic displacement to form non-rigid rob PBZ polymers. The non-rigid rod PBZ polymers can be used to form molecular composites with rigid rod PBZ polymers which molecular composites are not substantially phase separated.Type: GrantFiled: January 10, 1992Date of Patent: March 16, 1993Assignee: The Dow Chemical CompanyInventors: Muthiah N. Inbasekaran, Michael J. Mullins
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Patent number: 5194577Abstract: Crystallizable polyphthalamides with a useful combination of thermal and mechanical properties comprising recurring moieties of terephthalic acid, adipic acid, an aliphatic diamine of 4 to 20 carbon atoms and meta-xylylene diamine.Type: GrantFiled: December 10, 1991Date of Patent: March 16, 1993Assignee: Amoco CorporationInventor: Yu-Tsai Chen
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Patent number: 5194568Abstract: It is advantageous to prepare oligomers of polybenzazole polymers by reaction of AA-PBZ monomer with an excess of BB-PBZ monomer. The resulting oligomer dopes may be stored at a temperature at which they remain pumpable until such time as the dope can be advanced to higher molecular weight by adding additional AA-PBZ monomer. The molecular weight of the polymer may be adjusted by controlling the amount of chain extender and/or chain terminator added to oligomer mixtures as they are advanced to final molecular weight.Type: GrantFiled: October 19, 1990Date of Patent: March 16, 1993Assignee: The Dow Chemical CompanyInventors: Thomas Gregory, Carl W. Hurtig, Harvey D. Ledbetter, Kenneth J. Quackenbush, Steven Rosenberg, Ying H. So
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Patent number: 5191060Abstract: A process of preparing homopolymers and copolymers of dodecane terephthalamide having a high melting temperature and dimensional stability, comprising the steps of forming an aqueous suspension of a prepolymer comprising substantially equimolar diacid/diamine admixture of 1,12-dodecanediamine, terephthalic acid, and optionally at least one additonal comonomer in a reactor at a reaction temperature below the melting temperature of the resulting polyamide polymer; drying the prepolymer; and polycondensating the dried prepolymer in an extruder, particularly a vented single screw extruder, to form the polyamide polymer.Type: GrantFiled: January 8, 1992Date of Patent: March 2, 1993Assignee: Allied SignalInventors: Murali K. Akkapeddi, Michael F. Cummings, Gerald J. Dege
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Patent number: 5189134Abstract: Novel nonlinearly optically active polymers, well suited for electrooptical applications, are prepared by copolymerizing a first difunctional monomer with a second difunctional comonomer, with at least one of such difunctional monomers including a polar charge transfer moiety containing at least one electron acceptor group and at least one electron donor group (D), and further wherein the polymerizable functional groups are borne by the one or more electron donor groups (D).Type: GrantFiled: September 18, 1989Date of Patent: February 23, 1993Assignee: Rhone-Poulenc ChimieInventors: Gerard Mignani, Pascal Barthelemy, Remi Meyrueix
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Patent number: 5178964Abstract: A polyimide resin or composite may be pretreated by heating a reaction mixture that initially includes an aromatic diamine monomer, an end cap monomer, and an aromatic dianhydride monomer to a temperature between about 250.degree. C. and about 300.degree. C. for a period sufficient to completely imidize the reaction mixture to an imide resin without substantial crosslinking. A crosslinked reinforced polyimide composite article may be fabricated by heating a plurality of prepregs to a first temperature between about 250.degree. C. and about 300.degree. C. for a first period sufficient to completely imidize the prepreg without substantial crosslinking. Each prepreg has a plurality of reinforcing fibers and a reaction mixture.Type: GrantFiled: July 29, 1991Date of Patent: January 12, 1993Assignee: United Technologies CorporationInventors: Daniel A. Scola, John H. Vontell
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Patent number: 5177178Abstract: Rigid, amorphous copolyamides which can be produced in a single-stage polycondensation reaction with a high glass transition temperature and low water absorption capacity, based on cycloaliphatic diamines, dimerized fatty acids and aromatic dicarboxylic acids.Type: GrantFiled: July 24, 1991Date of Patent: January 5, 1993Assignee: EMS-Inventa AGInventors: Helmut Thullen, Eduard Schmid
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Patent number: 5177177Abstract: Rigid, amorphous copolyamides, which can be produced in a single-stage polycondensation reaction, having a high glass transition temperature and low water absorption capacity, consisting essentially of cycloaliphatic diamines, dimerized fatty acids, and aromatic dicarboxylic acids, and a method for the manufacture thereof.Type: GrantFiled: July 24, 1991Date of Patent: January 5, 1993Assignee: EMS-Inventa AGInventors: Helmut Thullen, Eduard Schmid
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Patent number: 5175238Abstract: A polyamide composition comprising the following recurring units: ##STR1## in proportions such that the mole ratio of the dicarboxylic acid moieties in the A, B and C units is about 49.5-0.5/0-20/0.5-49.5 and wherein R is a divalent radical comprising ##STR2## in a mole ratio of about 0.5-50/49.5-0 and preferably having a glass transition temperature of 90.degree. C. or greater and an oxygen transmission rate of about 2.0 cc-mil/100 in.sup.2 -day-atm or less.Type: GrantFiled: August 30, 1990Date of Patent: December 29, 1992Assignee: Amoco CorporationInventors: John D. Matlack, James G. Villanueva, Bruce A. Newman, Lawrence D. Lillwitz, Melvin L. Luetkens, Jr., Gregory E. Schmidt
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Patent number: 5166312Abstract: The invention relates to molding compositions which are stable with respect to alcohol and boiling water. The known molding compositions which are stable to boiling water and comprise amorphous copolyamides have unsatisfactory stability to alcohols. There is therefore a demand to improve molding compositions comprising polyamides in this respect.The invention provides molding compositions based on an amorphous copolyamide prepared from:(A) isophthalic acid; and(B) 20-80 mol % of n-decamethylene-1,10-diamine, and 20-80 mol % of bis(4-aminocyclohexyl)methane.Type: GrantFiled: October 19, 1990Date of Patent: November 24, 1992Assignee: Huels AktiengesellschaftInventors: Markus Wenzel, Martin Bartmann, Jurgen Finke, Hans-Joachim Panoch
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Patent number: 5166307Abstract: Polyamides of the general formula [N(A)-X-N(B)-CO-Y-CO-].sub.n are described, in which Y denotes a divalent group, X a divalent radical whose chain contains at least two carbon atoms, A and B independently of one another denote H or a C.sub.1 to C.sub.26 alkyl group and n denotes an integer greater than 4. The said polyamides contain at least one alkyl group of C.sub.6 to C.sub.26 per repeating unit. The groups X and/or Y contain at leat one CH.sub.2 group in the chain. The polyamides are prepared by reaction of a diamine of the formula NHA-X-NHB with an about equimolar amount of a reactive derivative of a dicarboxylic acid of the formula COOH-Y-COOH. The polyamides obtained can be used in order to prepare highly ordered monomolecular LB films on a support. For this purpose, the polyamide is dissolved in a volatile organic solvent which is immiscible with water and the solution is spread on the water/air interface.Type: GrantFiled: September 5, 1989Date of Patent: November 24, 1992Assignee: Hoechst AktiengesellschaftInventors: Harald Cherdron, Werner Prass, Ude Scheunemann, Donald Lupo
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Patent number: 5128442Abstract: A process for the preparation of a linear polyamide by reacting the appropriate dicarboxylic acid and diamine in a liquid reaction medium with the addition of a catalytically effective phosphorus compound, removing the reaction medium to give a solid salt, precondensing the latter in the solid phase at a temperature of from 140.degree. C. to 5.degree. C. below the melting point of the salt and continuing condensation at a temperature above that used for the precondensation until the desired degree of condensation is reached.Type: GrantFiled: April 8, 1991Date of Patent: July 7, 1992Assignee: BASF AktiengesellschaftInventors: Gunter Pipper, Wolfgang F. Mueller, Harald Dauns
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Patent number: 5128441Abstract: A block polyamido primary amine condensation product prepared by reacting a defined polyoxyalkylene polyamine having terminal primary amine groups with an amount of a defined dicarboxylic acid or an anhydride or a C.sub.1 to C.sub.4 alkyl ester thereof, sufficient to react one mole of the dicarboxylic acid reactant with each primary amine group of the polyoxyalkylene polyamine to thereby prepare an intermediate condensation reaction product containing terminal carboxyl groups, and reacting one mole of a defined organic di-primary amine with each terminal carboxyl group of the said intermediate condensation reaction product to thereby provide, as the principal product of the reaction a block polyamido primary amine condensation product.Type: GrantFiled: May 4, 1990Date of Patent: July 7, 1992Assignee: Texaco Chemical CompanyInventors: George P. Speranza, Jiang-Jen Lin
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Patent number: 5118785Abstract: Polyether amides may be produced by reacting aromatic dicarboxylic acids with tetraethylene glycol diamine. This is surprising since aromatic dicarboxylic acids, such as terephthalic acid cannot be readily reacted with triethylene glycol diamine. Suitable dicarboxylic acids include terephthalic acid, isophthalic acid, t-butyl isophthalic acid, and mixtures thereof. Tetraethylene glycol diamine is also known as JEFFAMINE.RTM. EDR-192 Amine. The resulting polyether amides are useful to make polymers, including fibers, with unusually good water absorbancy properties.Type: GrantFiled: April 10, 1990Date of Patent: June 2, 1992Assignee: Texaco Chemical CompanyInventors: George P. Speranza, Wei-Yang Su
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Patent number: 5112685Abstract: Poly(2-methyl-1,5-pentylene) terephthalamide is discussed herein. It is manufactured in a process starting with a nylon salt made from terephthalic acid and 2-methyl-1,5-pentylene diamine and an excess amount of the diamine. The polymer is spun to form monofilaments. The monofilaments may be used, among other things, to form dryer screens for use in a paper forming process.Type: GrantFiled: February 11, 1991Date of Patent: May 12, 1992Assignee: Hoechst Celanese CorporationInventors: Robert B. Rashbrook, Clyde W. Alexander, Edward C. Bland
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Patent number: 5109106Abstract: Amorphous or semicrystalline semi-aromatic copolyamides are prepared, with significantly reduced loss of amino reactant, by polycondensing an acidic monomer which includes at least one aromatic dicarboxylic acid having from 8 to 18 carbon atoms with an amino comonomer consisting essentially of an alkylpentamethylenediamine, or salt thereof, wherein said polycondensation is carried out in a closed reaction zone.Type: GrantFiled: February 21, 1990Date of Patent: April 28, 1992Assignee: Rhone-Poulenc ChimieInventors: Pierre-Yves Lahary, Serge Roy
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Patent number: RE34447Abstract: Novel crystalline polyamides having high heat deflection temperatures when filled are prepared from aliphatic diamines and either mixtures of terephthalic acid and adipic acid or mixtures of terephthalic acid, isophthalic acid and adipic acid. The mole ratio of aliphatic diamine to terephthalic acid, isophthalic acid, and adipic acid is in the range of about 100:65-95:25-0:35-5. The polyamides can be filled with about 10 to about 60 parts by weight of a filler. The mechanical properties of these polyamides are largely unaffected by absorbed water.Type: GrantFiled: July 21, 1988Date of Patent: November 16, 1993Assignee: Amoco CorporationInventors: Wassily Poppe, Larry W. Autry, Yu-Tsai Chen, Joel A. Richardson, David P. Sinclair