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7597722 |
Process for making polyamide textile articles bearing designs in different colors
Process for manufacturing a fabric having distinctive and sharp differentially colored patterns or designs, which process comprises the steps of: (a) producing a first and a second polyamide, said...
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7465780 |
Polyimide comprising sulfonic acid group at the terminal of side chain, and polymer electrolyte and fuel cell using the same
The present invention is related to a polyimide, which has high ionic conductivity and good structural stability, does not decompose even under low humidity, and is inexpensive, and a polymer...
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7101959 |
Polymerization catalysts
A subject of the present invention is new compounds having a lanthanide and having a tridentate ligand, a process for their preparation and their use in particular as polymerization catalysts.
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7091303 |
Oil soluble hyperbranched polyesteramides
The invention relates to a method to produce a modified hyperbranched polyesteramide, containing at least two β-hydroxylamide ester groups and optionally also a hydroxyalkylamide endgroup, wherein...
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7074851 |
Method for making stabilised polyamide compositions
The invention relates to a process for preparing stabilized compositions based on polyamide. The stabilizer is a phosphorus stabilizer selected from phosphorous acid and hypophosphorous acid. It is...
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7053172 |
Fuel-barrier polyamide resin and multilayer shaped article
The fuel-barrier polyamide resin of the present invention is a product of the polycondensation of a diamine component comprising 70 mol % or higher of m-xylylenediamine and a dicarboxylic acid...
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6987163 |
Modified polybenzimidazole (PBI) membranes for enhanced polymer electrochemical cells
The invention relates to a modified polybenzimidazole (PBI), membranes that are fabricated from these polymers, and their use in electrochemical applications. These membranes have high ionic...
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6841651 |
Polyamide resin
The polyamide resin of the present invention is produced by polycondensation of a diamine component comprising 70 mol % or more of m-xylylenediamine and a dicarboxylic acid component comprising 70...
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6783560 |
Process for preparing wetfast polyamide fibers
A modified polyamide polymer having a high amino end group content, with more than 30 percent of the amino end groups being secondary or tertiary amine, dramatically improves the dye bleed...
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6693163 |
Solid-phase drying and solid-phase polymerization of polyamide
In the method for solid-phase drying or solid-phase polymerizing a polyamide of the present invention, the polyamide that is stored for 20 days or longer after the production thereof until...
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6680364 |
Water dispersible polyamides with ethylenically unsaturated ends
The invention describes polyamides having both strongly hydrophilic groups and unsaturated groups, the polyamides consequently being water-dispersible and curable. The hydrophilic groups are...
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6653399 |
Water absorbent material
A water absorbent material, comprising, as a main component, a water absorbent resin which has a structure in which a anhydropolyamino acid having an ethylenically unsaturated double bond is...
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6610816 |
Process for production of polyamide
In the production of polyamide by the melt-polymerization of the present invention, the polymerization conditions are rapidly and accurately controlled by a near-infrared spectroscopy to enable the...
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6541600 |
Water soluble and dispersible highly branched polyamides
Highly branched polyamides prepared in a single step procedure of condensation polymerization of multifunctional monomer reactants comprising amine and carboxylic acid functional groups....
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6541599 |
Process for manufacture of soluble highly branched polyamides, and at least partially aliphatic highly branched polyamides obtained therefrom
A process for the manufacture of soluble hyperbranched polyamides is disclosed comprising the steps of combining multifunctional monomer reactants comprising amine and carboxylic acid functional...
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6531570 |
Accelerator for the production of polyamides from aminonitriles
Disclosed are the use of lactams, aminocarboxylic acids or mixtures thereof as acceleratant or cocatalyst in the production of polyamides from aminonitriles and water, and a suitable process therefor.
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6528614 |
Process for the production of polyamide-6 from epsilon-caprolactam
The invention relates to a process for the production of polyamide-6 by polymerization of ε-caprolactam with full re-use of extracted caprolactam and oligomers. The extract is not subjected to a...
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6495657 |
Two dimensional polyamides prepared from unsaturated carboxylic acids and amines
A polyamide and a process for preparing the polyamide are disclosed. The process comprises reacting in a reaction mixture a monomer selected from unsaturated carboxylic acids, esters of unsaturated...
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6437089 |
Process for the production of nylon 6
Process for making nylon 6 in which a feed stream containing a major portion of caprolactam and/or nylon 6 prepolymer and a minor portion of aminocapronitrile is fed to a multistage reactive...
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6310173 |
Batch process for producing polyamides from aminonitriles
The batch process for producing a polyamide by reaction of a mixture comprising at least one aminonitrile, and optionally monomers useful for polyamide production, with water, comprises the...
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6277948 |
Process and product for making polyamides
Disclosed in the present invention is a process for modifying a polyamide polymer comprising contacting a reactive modifier with diamine/diacid salt and/or an amino-acid of a hydrolyzed lactam or...
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6268465 |
Hydrolysis-resistant aliphatic polyester amides, their production and use
An aliphatic polyester amide which is hydrolysis-resistant includes a ternary polycondensation product of monomeric constituents composed of a monomeric constituent A which is at least one diol...
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6258928 |
Process for improving characteristics of a polyamide
A process for improving characteristics such as, whiteness retention, degradation, and dyeability of a polyamide by contacting the polyamide with thiocyanate. A polyamide produced by the process...
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6258926 |
Process and device for producing high-viscosity or highly stabilized reaction-stable polyamides, and for continuously demonomerizing polyamides
The invention concerns a process and device for producing high-viscosity or highly stabilized, reaction-stable polyamides, in particular polyamide 6, with reactive amino end groups of less than 50...
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6248861 |
Manufacture of branched polyamides
A multi-stage process for the manufacture of branched aliphatic polyamides is provided. The process comprises the steps, in sequence, of feeding to a reactor a slurry of at least one aliphatic...
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6191251 |
Polyamides having improved color and processibility and process for manufacturing
Incorporation of certain phosphorus compounds in conjunction with certain bases into a polyamide melt or a polyamide manufacturing polymerization process results in a polyamide having improved...
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6169161 |
Method for producing polyamides
For producing a polyamide having an unreacted caprolactam content of from 0 to 0.5% by weight and an oligomer content of from 0 to 1.25% by weight and having a relative viscosity in a 0.01 g/ml...
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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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6103860 |
Fluorine-containing polyamide
There is disclosed an organic optical component prepared from a resin essentially comprising one or more repetitive structural units selected from the group consisting of structures represented by...
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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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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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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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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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5939518 |
Polyaspartate (salt) by polymerizing aspartic acid and hydrolyzing
A method for the preparation of a desired molecular weight polysuccinimide by the catalytic polymerization of aspartic acid in the presence of a cyclic carbonate solvent. Polysuccinimide of...
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5939513 |
Methods of removing pigment stain using detergent compositions containing polyamine N-oxide polymers
Methods of removing a pigment stain from a substrate comprise cleaning the substrate with a detergent composition comprising polyamine N-oxide polymer formed of units having structural formula (I)...
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5932687 |
Preparation of precipitated polyamide powders of narrow particle size distribution and low porosity
Certain applications require polyamide powders of narrow particle size distribution and low porosity. The precipitation process of the invention incorporating a prior nucleation phase provides 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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5866627 |
Photosensitive polyimide precursors
New photosensitive polyamic acid precursors are disclosed which have the formula: ##STR1## where Z is a tetravalent organic radical which contains at least one aromatic ring, Z' is a divalent...
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5859178 |
Polymerization of caprolactam with certain quaternary ammonium compounds
A process for the polymerization of caprolactam to nylon-6 polymer, comprising the use of a polymerization accelerator having the structural formula ##STR1## wherein R 1 , R 2 , R 3 and R 4 are...
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5789525 |
Process for making polyimides from diamines and tetracarboxylic diacid diester
A process for making polyimide composition comprising reacting at least one diamine, at least one tetracarboxylic diacid diester, selected phosphoramide and at least one base catalyst to form at...
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5789524 |
Chemical imidization reagent for polyimide synthesis
A process for producing a polyimide composition by reacting at least one polyamic acid or at least one polyamic ester or a mixture of at least one polyamic acid and at least one polyamic ester with...
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5776875 |
Use of biodegradable polymers in preventing scale build-up
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...
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5744125 |
Cosmetic melanins
Disclosed are cosmetic melanins of different colors produced by procedures involving oxidative polymerization of monomeric precursors of melanin and/or co-monomers that enhance substantivity or...
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5723569 |
Random copolymerized polyamide resin and process for preparing the same
A random copolymerized polyamide resin is prepared by reacting a lactam of the formula (I): ##STR1## wherein R 1 is a C 2 -11 alkylene group optionally substituted with a substituent having 1 to 6...
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5698658 |
Linear very high molecular weight polyamides and process for producing them
A linear polyamide having a weight average molecular weight above 200,000 is made by heating a lower molecular weight molten polyamide with thorough mixing at a temperature of about 265°-300° C....
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5693744 |
Amorphus polyamides having second order nonlinear optical property, and method for preparing them
An amorphous polyamide represented by the formula(2) ##STR1## in which each R is at least one alkylene radical having 1 to 10 carbon atoms, R' is an electron acceptor group represented by the...
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5688902 |
Process for the preparation of polyimides or of their biodegradable polypeptide hydrolysates
Process for the preparation of polyimides or of their polypeptide hydrolysates which are at least 80% biodegradable, by thermal polycondensation of at least one amino acid, optionally followed by...
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5627257 |
Process for the production of polyamides on the basis of α,ω-dinitriles
Process for synthesis of spinnable polyamide from α, ω-alkyldinitriles and α, ω-alkyldiamines and excess water, where a) the aqueous solution of the dinitrile is mixed with a catalytic amount...
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5624752 |
Spun yarn of polybenzazole fiber
There is provided a spun yarn of a polybenzazole fiber having a single fiber fineness of 1 to 3 deniers and an average fiber length of 30 to 200 mm, the spun yarn having a tenacity of 15 g/d or...
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5545833 |
Phosphorus-containing polymers and fibers formed therefrom
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...
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