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6111054 |
Products obtainable by salt formation from polyamines and the use thereof as dispersing agents for pigments and extenders
The present invention relates to a dispersing agent for pigments or extenders which is obtainable by salt formation from an amine-functional compound by means of an acid, wherein a polyamine which...
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6107449 |
Process and device for continuous production of polyamides
A process and a device for continuous production of polyamides from a monomer starting material consisting (up to 100%) of adipic acid hexamethylene diamine and water are described. The process is...
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6107438 |
Method of producing polyamide resin
A method of producing a polyamide resin by reacting with at least one diamine compound, at least one linear polyester resin consisting of at least one dicarboxylic acid component and at least one...
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6103862 |
Alignment film material for a liquid crystal cell and a method for preparing the same
A novel compound of N-substituted aromatic polyamide is prepared by introducing an aralkyl group to the N-position of an aromatic polyamide by metalizing the aromatic polyamide, then reacting the...
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6103863 |
Process for preparation of polyamide from dinitrile and diamine
A two-step process for the production of polyamides from α,ω-dinitriles and α,ω-diamines involving the catalytic hydrolysis of the α,ω-dinitrile by addition of water with simultaneous purging...
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6100370 |
Softener-free polyamide and molding composition and use thereof
The invention concerns a softener-free polyamide prepared by polycondensation and/or polymerization of polyamide-forming monomers, wherein it was obtained by adding 5-50 wt. % of a dimer diol with...
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6087470 |
Preparation of soluble polyamide, polyimide and poly(amide-imide)
The new diamine, "3,3',5,5'-tetramethyl-2,2-bis[4-(4-amino-phenoxy)phenyl]pro
pane" was synthesized and used to prepare high performance soluble engineering plastics by polycondensation. The...
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6084056 |
Process for the hydrolysis of adiponitrile and the production of nylon 6,6 utilizing low catalyst levels
A process for the hydrolysis of a dinitrile (e.g., adiponitrile) utilizing from 0.1 to 500 mmoles of catalyst (e.g., a mixture of phosphorous acid and calcium hypophosphite) per mole of the...
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6072023 |
Polyamides from dimer and trimer acid esters and methods for their preparation
Polyamides and process for their preparation comprising either A) epoxidizing an unsaturated or partially hydrogenated fatty acid glyceride; B) transesterifying the epoxidized glyceride with...
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6069228 |
Process for preparing polyamides
Disclosed is a process for the preparation of polyamide polymers via prepolymer formation in a reactor system comprising a reactor, flasher and separator, crystallization of the prepolymer under...
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6063862 |
Glass-polyamide composite and process for producing the same
Disclosed is a process for producing a glass-polyamide composite comprising bringing into contact or mixing (A) an aqueous solution containing water, water glass, and a diamine and (B) an organic...
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6054553 |
Process for the preparation of polymers having recurring agents
Polymers having recurring succinyl units are obtained by an improved process by reaction of A, an unsaturated C 4 -dicarboxylic acid or a derivative thereof, with B, a nitrogen-donating compound,...
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6025459 |
Synthesis of polyamides in liquid and supercritical CO.sub.2
A method of forming a polyamide from a corresponding nylon salt material comprises providing a reaction mixture comprising a nylon salt and carbon dioxide; and then condensing the nylon salt in the...
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6011134 |
Method for manufacturing poly(hexamethylene adipamide) from monomethyladipate and hexamethylenediamine
An improved method for manufacturing poly(hexamethylene adipamide), i.e. nylon 6,6, by reacting monomethyl adipate with hexamethylenediamine in an approximately equimolar ratio in the presence of...
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6011131 |
Process for the preparation of polyamides
Process for the preparation of polyamides comprising the steps of A) reacting a soybean oil condensate obtained from the deodorization of refined soybean oil and which contains less than 30% by...
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6001957 |
Stabilized polyetherimide resin composition
A thermoplastic resin composition that includes a polyetherimide resin and a phosphorus-containing stabilizer that exhibits a low volatility. The thermoplastic resin composition exhibits improved...
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5998572 |
Methods and devices for controlling the oxidation of a hydrocarbon to an acid by regulating temperature/conversion relationship in multi-stage arrangements
Methods and devices for controlling the oxidation of a hydrocarbon to an acid by regulating the temperature hold-up time, and conversion in consecutive reaction zones. The temperature in the...
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5998492 |
Super-absorbing polymeric networks
Disclosed are methods of producing super-absorbing polymeric networks of polyaspartates from crosslinked polysuccinimide. In one preferred aspect, polysuccinimide is first reacted with an organic...
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5994494 |
Antisettling agent for aqueous paints
An antisettling agent for aqueous paints giving excellent settling-preventing properties to aqueous paints is provided. The antisettling agent is produced by the following process: A polyamide,...
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5990270 |
Amorphous, transparent polyamide compositions and articles having reduced flammability
A polyamide composition which is amorphous and transparent, which has reduced flammability, and which has reduced migration of flame-retardant additive so that it is film-free, includes at least...
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5986041 |
Polyetheresteramide and method of preparing the same
A polyetheresteramide compound and the method of preparing it comprise: a polyether compound containing a diamino group at the end mixed with a diacid and a diol, and being polymerized and...
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5981692 |
Semi-crystalline, semi-aromatic terpolymers with superior post-molding shrinkage and balance of mechanical performance
This invention relates to high temperature, semi-crystalline, semi-aromatic nylon terpolymers with improved shrinkage resistance, made from terephthalic acid (TA), hexamethylene diamine (HMD)...
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5973105 |
Process for continuously preparing a polyamide 6 with a low dimer content
The invention concerns a process for continuously preparing polyamide 6 with a low dimer content from ε-caprolactam (fresh lactam) and/or from recycled lactams from extraction and...
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5965689 |
Electrical and electronic components made of a polyamide composition
The invention relates to electrical and electronic components made of a polyamide composition and possessing an improved resistance under soldering conditions, particularly when the surface...
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5962628 |
Partially aromatic polyamides having improved thermal stability
Improved high temperature polyamides, and particularly partially-aromatic polyamides, containing less than about 40 μeq/g carboxylic acid endgroups. When stabilized with a copper-containing...
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5959069 |
H-shaped polyamides
Polyamides are built up from, as fundamental building blocks (a), lactams or aminocarboxylic acids or mixtures of these, as fundamental building blocks (b), from 1 to 50 μmol of at least...
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5955569 |
Method for solid phase polymerization
An improved method for increasing the relative viscosity and molecular weight of a polyamide polymer (such as nylon 6,6, nylon 6, and the like) while in the solid state involving the use of a...
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5948880 |
Aqueous dispersions of polyamides
A process is provided for preparing a dispersion of a polyamide in water, said process comprising: forming a solution of a polyamide having an acid value of greater than about 2 in an organic...
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5939519 |
Polyesteramides of high crystallinity and reagents for their preparation
The crystallinity of poly(1,4-cyclohexanedimethyl 1,4-cyclohexanedicarboxylate) is enhanced by the incorporation of amide units, preferably derived from such compounds as...
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5939512 |
Fast cycling blended polymer material comprising Nylon-6
A composition comprising a polyamide, a polyolefinic modifier, and an ethylene/acrylic acid copolymer.
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5932689 |
Formaldhyde-free compositions for nonwovens
A formaldehyde-free curable composition useful for binding nonwovens comprises (a) a polyacid comprising at least two carboxylic acid groups, anhydride groups, or salts of the polyacid thereof; ...
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5922830 |
Highly hygroscopic polyamide fiber, and production and application thereof
A highly hygroscopic polyamide fiber formed from a polyamide compound containing a polyvinylpyrrolidone (in an amount of 3-15 wt %) which is synthesized in isopropyl alcohol as a solvent, contains...
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5919892 |
Polyamic acids and methods to convert polyamic acids into polyimidebenzoxazole films
This invention relates to polyamic acids and to methods for converting polyamic acid into polyimidebenzoxazole polymers. The polyamic acids are prepared by reacting a dianhydride with a...
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5917004 |
Weather-resistant polyamides and method of their production
The invention is relative to weather-resistant polyamides and to methods of their production in which the polymerization or polycondensation of the polyamide-forming monomers (I) is carried out in...
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5907028 |
Method for making polyesterimide varnishes
A method for making polyesterimide varnishes by polycondensing and imidat a mixture of trimellitic anhydride, 4,4'-diamino-diphenyl methane, glycol, dimethyl terephthalate and glycerol or...
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5895809 |
Method of producing partially aromatic copolyamides from aromatic dicarboxylic acid esters
The invention relates to a method of producing partially aromatic copolyamides from polymeric esters of aromatic dicarboxylic acids by amidation of the ester groups with diamines, removal of the...
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5889138 |
Process for making stain resistant nylon fibers from highly sulfonated nylon copolymers
A process for making stain resistant nylon fibers from a mixture of nylon and highly sulfonated nylon copolymer is disclosed. The highly sulfonated nylon has greater than about 4.0% weight of...
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5886131 |
Method for preparing 1,4-Bis(4-aminophenoxy)naphthalene and its polymers
A method for synthesizing 1,4-bis(4-aminophenoxy)naphthalene and a series of polyamides, polyimides and copoly(amide-imide)s derived from the said compound is disclosed. These polymers possess...
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5874519 |
Para-oriented aromatic polyamide shaped articles and preparation thereof
There are disclosed a para-aramid shaped article having a density of 1.390-1.470/cm 3 . The para-aramid has an inherent viscosity ηinh of at least 3.5 and contains metal ions of 500 ppm or less,...
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5874518 |
Epoxy-modified polyamide resin
An epoxy-modified polyamide resin obtained by reacting a diisocyanate(A) with at least one member selected from the group consisting of a dicarboxylic acid and a tricarboxylic acid anhydride (B) in...
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5859177 |
Process for subsequent condensation of polycondensates, in particular of polyamide 6.6
The process for single-stage postcondensation of a polycondensate in a fluidized bed reactor (1) includes feeding the polycondensate through the fluidized bed reactor (1); circulating a main stream...
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5859179 |
Forming superabsorbent polymer
A method of preparing superabsorbent polymer as crosslinked polyaspartate salt by reacting polysuccinimide dissolved in organic solvent with crosslinker and reacting the polysuccinimide in situ...
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5859170 |
Aromatic ploycarbodiimine and sheet using it
An aromatic polycarbodiimide containing a siloxane bond in the polymer main chain thereof. The polycarbodiimide can adhere at a low temperature in a short time and has a high heat resistance. The...
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5859175 |
Process for the preparation of polyether amide solutions, steam-sterilizable dialysis membranes obtainable using the polyether-amide solutions, and a process for the production of these membranes
Process for the preparation of polyether-amide solutions, steam-sterilizable dialysis membranes obtainable using the polyether-amide solutions, and a process for the production of these membranes....
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5859180 |
Process for the solid state polycondensation of polyamide resins
Process for the solid state polycondensation of polyamide resins by the use in the polycondensation reactor of a quantity of an inert gas such that the ratio by weight between the solid capacity/h...
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5856429 |
Polyamide compositions for removal of polyphenols from liquids
Amide-containing polymers characterized by the presence of piperazine amide and/or substituted piperazine amide in the polymer chain are used as adsorbents to remove polyphenolic compounds from...
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5856428 |
Crystalline aromatic polyamide resin composition
An aromatic polyamide resin composition composed of two types of aromatic polyamide (A) and (B), where (A) is an aromatic polyamide wherein the molar ratio of aromatic polyamide with respect to the...
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5856426 |
Para-oriented aromatic polyamide porous film
A para-oriented polyamide porous film comprising a fibril having a diameter of not more than 1μ, with fibrils planarly arranged as a network or nonwoven fabric and laminated in a layer, the...
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5852165 |
Terpolymer polyamide, polyamide resin composition containing the same, and automotive parts obtaining from these
A crystalline terpolymer polyamide produced from: (a) an equimolar salt of hexamethylenediamine with adipic acid, (b) an equimolar salt of hexamethylenediamine with terephthalic acid, and (c)...
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5847013 |
Superabsorbing polymeric networks
Disclosed are methods of producing super absorbing polymeric networks of polyaspartates from crosslinked polysuccinimide. In one preferred method aspect, polysuccinimide is first reacted with an...
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