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5077378 |
Polyamide containing the hexafluoroisopropylidene group
This invention is that of high temperature polyamides containing the hexafluoroisopropylidene group. The high temperature polyamides of the invention and photo or radiation sensitizers provide...
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5068311 |
High molecular weight (co)polyamide from diamino-alcohol
The invention relates to high molecular weight thermoplastically deformable branched aliphatic polyamides prepared by polycondensation of lactams and/or polyamide-forming diamine/dicarboxylic acid...
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5066760 |
Mixed polyimides and process for preparing them
To produce mixed polyimides having structural units of the general formulae ##STR1## wherein n is an integer larger than 1 and R represents a divalent aromatic residue, a solution of an...
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5051491 |
Process for the preparation of a linear polyamide having ether bridges in the polymer chain
A process for the continuous preparation of a linear polyamide having ether bridges in the polymer chain, in which an aqueous solution of a salt of a diamine and an equimolar amount of a...
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5049651 |
Process for the preparation of branched (co)polyamides by solid phase post-condensation, and corresponding (co)-polyamides
The invention relates to a process for the solid phase post-condensation of (co)polyamides which contain small amounts of lysine components and about equivalent amounts thereto of a polycarboxylic...
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5039786 |
Continuous preparation of copolyamides from caprolactam and salt of diamine and dicarboxylic acid
Copolyamides are prepared by a continuous process in which (a) an aqueous solution of salts of equimolar amounts of diamines and dicarboxylic acids is passed, under superatmospheric pressure and...
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5032667 |
Amide and/or imide containing polymers and monomers for the preparation thereof
Described herein are amide and/or imide containing polymers based on novel monomers that contain isoalkylidene bridges. These polymers have excellent toughness combined with high temperature...
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5028689 |
Branched (co)polyamide by polycondensation in the presence of lysine component polycarboxylic acid mixture
This invention relates to thermoplastically mouldable slightly branched aliphatic (co)polyamides of high molecular weight with increased melt viscosities and a marked structural viscosity prepared...
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5026818 |
Melt preparation of polyamide with additive combination
The invention relates to high molecular weight (co)polyamides and to a process for the accelerated production of polyamides during melt polycondensation using a combination of aminocaprolactam...
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5015680 |
Production of a thermoplastically processable, aromatic polyamide using a 4-phenoxypyridine stabilizer
An aromatic polyamide, e.g., from isophthalic acid and 4,4'-bis(4-aminophenoxy)diphenylsulfone, is produced with a sufficient amount, e.g., 0.05-4 mol%, of 4-phenoxypyridine to improve resistance...
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4994503 |
Particulate polymer and polymer compositions therewith
This invention relates to a composition comprising a particulate polymer dispersed in a continuous phase and a process for preparing the particulate polymer. The particulate polymer is...
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4987217 |
Wholly aromatic polyamide
Aromatic copolyamides, soluble in organic polyamide solvents, comprise at least 95 mol % of the recurrent structural units of the formulae ##STR1## and up to 5 mol % of structural units containing...
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4983718 |
Color minimization during melt preparation of polyamides with hypophosphorus acid
A process for minimizing the formation of color during preparation of polyamides by interchange of diesters of dicarboxylic acids with diamines in the presence of hypophosphorous acid.
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4980451 |
Catalytic production of aromatic polyamides from high purity monomers
Aromatic polyamides having an improved resistance against thermal oxidation, are produced by utilizing monomers having a very high degree of purity, at least 99.90% by weight, preferably, at least...
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4970291 |
Preparation of polyamide in the presence of aryl phosphoryl azide
A process for preparing polyamides which comprises condensing an aromatic or aliphatic diamine and an aromatic or aliphatic diacid or an amino acid in the presence of one or more aryl phosphoryl...
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4963646 |
Preparation of amorphous polyamides based on aromatic dicarboxylic acids and on aliphatic diamines from unbalanced polyamide prepolymer
Amorphous (co)polyamides are polycondensed from aromatic dicarboxylic acid(s), e.g., isophthalic acid and/or terephthalic acid, and from aliphatic diamine(s), e.g., hexamethylenediamine, by...
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4959453 |
Process for the preparation of a poly(paraphenylene terephthalamide)fibrous gel composition and a process to produce poly(paraphenylene terephthalamide) paper from the composition
A process for producing a fibrous gel composition of poly(paraphenylene terephthalamide) comprising the steps of placing terephthaloyl chloride in reactive contact with paraphenylene diamine in a...
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4948867 |
Interfacial method of producing prepolymer of aromatic polythiazole
A method of producing a prepolymer of aromatic polythiazole from an aromatic diaminodithiol compound or a salt thereof and a dicarboxylic acid derivative, the prepolymer having a repeating unit...
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4945153 |
Method of producing prepolymer of aromatic polythiazole in the presence of a phosphoric acid compound
A method of producing a prepolymer of aromatic polythiazole from an aromatic diaminodithiol compound salt and a dicarboxylic acid derivative, comprising the step of polymerizing the aromatic...
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4942220 |
Process for preparing poly-amide from nitrile and amine with catalytic complex
Polyamides are prepared from a carbonitrile and an amine by reacting by heating a mixture of a carbonitrile which is a dinitrile, an equivalent amount of a primary or secondary amine which is a...
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4937289 |
Process for producing polyamide
Disclosed herein is a process for producing a polyamide comprising polymerizing at least one monomer of polyamide in the presence of (1) a hydrocarbon polymer having at least one group selected...
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4921932 |
Polyamide resin
A copolyamide resin containing a dimerized fatty acid as a copolymer component, which has (1) at least 25 equivalent %, based on the total number of terminal groups, of hydrocarbon groups having...
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4892927 |
α-amino-ε-caprolactam-modified polyamide of dicarboxylic acids/diamines
This invention relates to thermoplastically deformable, high molecular weight, slightly branched aliphatic polyamides prepared by the polycondensation of polyamide-forming, aliphatic...
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4892921 |
Pendant benzazole rigid-rod aromatic benzoxazole
Provided are novel para-ordered aromatic heterocyclic polymers having repeating groups of the following formula ##STR1## wherein Y is --O--, --S--, or --NH--, n is 1 or 2, and Q is ##STR2## wherein...
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4876328 |
Polyamide composition
Polyamide advanced composites are formed by the condensation of diacid halides (or dicarboxylic acids) and diamines in a linear or multidimensional morphology with crosslinkable end caps that...
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4873296 |
Polyamide polyethylene glycolpolyamide block copolymer
A linear block copolymer of regular structure, comprising polyamide and polyethylene glycol blocks. Two polyamide blocks (A) are bound through an intermediate polyethylene glycol block (B)...
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4851466 |
Process for preparing heat and light stabilized Nylon 66 polymer
Nylon 66 polymer is stabilized against heat and light during its preparation by conducting the polymerization in the presence of certain copper complexes, such as cupric amminohydroxide, and KBr...
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4847350 |
Preparation of aromatic heterocyclic polymers
Rapid process for the formation of heterocyclic aromatic polymers by contacting one or more appropriate multifunctional aromatic compounds, such as a diaminobenzenediol, a terephthaloyl halide...
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4833214 |
Soluble heat-resistant aromatic polyamide terminated with aromatic amido moieties
A soluble heat-resistant aromatic polyamide having amide bonds at the terminal ends thereof represented by the formula (I): R 1 CO--NH--Y--NH--X) n NH--Y--NHCOR 1 (I) wherein R 1 ...
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4831108 |
Polycondensation process with mean dispersion residence time
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,...
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4826951 |
Homogenous hexamethylenediamine/adipic acid/dimer acid copolyamide preparation
Homogeneous copolyamides having high melting points and good flexibility, well adapted for the production of textile materials and plastic shaped articles, are prepared by prepolymerizing lower...
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4820765 |
Polyamide from diamine and excess aromatic dicarboxylic acid
Water soluble polyamide resins are produced from an excess aromatic dicarboxylic acid and a diamine. The resin can be used in inks.
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4816549 |
Toluene soluble polyamide resin from polymerized fatty acid and 1,2-diamino cyclohexane
Polyamide resins are produced by reacting diamines, polymeric fatty acids, and monoamines. The monoamine component serves as a chain stopper and renders the polyamide resin product soluble in...
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4806623 |
Poly(p-phenylene-2,5-furandicarbonamide), anisotropic solution, filament, film thereof
Poly(p-phenylene-2,5,furandicarbonamide), with an inherent viscosity of at least 1.5 dl/g measured at 30° C. on a 5 g/dl solution in 98% sulphuric acid, is prepared by performing the condensation...
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4801748 |
Catalytic process for preparing amide from nitrile, amine and water
Amide compounds are efficiently prepared directly from nitriles, amines and water, using a reaction catalyst. The invention also can applied to the manufacture of polyamides, thereby realizing a...
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4801681 |
Method for the manufacture of polyimidazole and polyimidazo-pyrrolone precursors from tetra carboxylic acid moiety reactant
Oligomeric and/or polymeric radiation-reactive polyimidazole and polyimidazo pyrrolone precursors which are soluble in organic solvents, can be prepared with high purity, i.e., especially without...
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4788226 |
Polyamide membranes
A microporous membrane suitable for use in microfiltration. The membrane is a hydrophilic skinless sheet, formed of polytetramethylene adipamide, either alone, or in admixture with at least one...
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4778843 |
Polyamide rheological additive capped with monocarboxylic acid having olefinic unsaturation or hydroxyl group and containing 16-22 carbon atoms
A polyamide rheological additive especially for organic solvent-based compositions which comprises the reaction product of a defined polycarboxylic acid, active hydrogen compound and capping agent....
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4777238 |
Polyamide resin from dimer/trimer acid and N-alkyl diamine
Thermoplastic polyamide resins showing improved substrate adhesion and consisting essentially of polycondensates of the following components: (a) from 10 to 50 mole percent dimer fatty acids,...
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4762910 |
Process for the preparation of copolyamide from adipic acid, terephthalic acid and hexamethylene diamine
Process for the preparation of copolyamides from adipic acid, terephthalic acid and hexamethylene diamine containing 25-48% by weight of units of hexamethylene terephthalamide, by precondensing the...
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4760125 |
Thermoplastic polyamide based upon dimerized fatty acid and polyether polyamine
This invention is directed to thermoplastic polyamides and the preparation thereof. The thermoplastic polyamides, which are prepared by condensing (a) dimerized higher fatty acids and (b) monomeric...
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4754016 |
Process for preparing polyamide with organic phosphine/organic disulfide mixture condensing agent
A process for preparing a polyamide which comprises polycondensing a dicarboxylic acid and a diamine by using a combination of at least one phosphine and at least one disulfide as the condensing...
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4749776 |
Process for the manufacture of polyamide from dinitrile and diamine in contact with an ester of an oxygenated phosphorus compound catalyst and a strong base
The process for manufacturing a nylon-type polyamide from a dinitrile, a diamine and water in the presence of a catalyst is improved by using as a catalyst an ester of oxygenated phosphorus...
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4749768 |
Process for producing thermoplastically processable aromatic polyamide with phosphorus catalyst
The invention relates to a process for producing aromatic polyamides by melt condensation of (i) aromatic diamines of the formula H 2 N--Ar'--X--Ar"--Y--Ar"--X--Ar--NH 2 where X=--O-- and...
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4740582 |
Homogeneous, flexible block copolyetheramide having oxyalkylene units
Novel, homogeneous and flexible block copolyetheramides, having a melting point of at least 150° C., a glass transition temperature not exceeding -5° C. and a melt viscosity of at least 100...
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4739035 |
Two-step process for the manufacture of polyamide from diamine and dinitrile
The process for manufacturing polyamides, suitable for fibers, from an α,ω-dinitrile, and an α,ω-diamine in water in contact with a catalyst that is improved by (1) first, reacting the...
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4737571 |
Preparation of aromatic polyamide with solvent system comprising N-alkyl substituted amide and quaternary ammonium compound
A process and its product are disclosed whereby poly-p-phenylene terephthalamide is prepared in a polymerization solvent comprising an N-alkyl-substituted amide, preferably N-methyl-2-pyrrolidone,...
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4734487 |
Process for the manufacture of polyamides from diamine and diamide utilizing carboxamide as catalyst
Nylon-type polyamides are produced from a diamine and a diamide in contact with a catalyst comprising a carboxamide. For example, high quality nylon-6,6 is manufactured by contacting...
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4727130 |
Thermoplastically processible aromatic polyamides with chemically incorporated ether and sulfonyl groups; and method of manufacturing the same
This invention relates to a method of manufacturing aromatic polyamides having general formula (--CO--Ar--CO--NH--Ar'--X--Ar"--Y--Ar"--X--Ar'--NH--) m where Ar, Ar', and Ar" each represent an m-...
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4725666 |
Process for the manufacture of polyamide from diamine and dinitrile utilizing (1) copper containing compound and (2) oxygen containing compound of phosphorus or sulfur as catalyst mixture
Polyamides are produced from diamines, dinitriles, and water in contact with a two-component catalyst system comprising (1) at least one copper containing compound and (2) at least one oxygen...
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