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| Number | Title | Issue Date |
| 7393913 | Polyamides Polyamide whose main chain contains a chemically bound N-alkyllactam, and processes for preparing such a polyamide and fibers, films and moldings comprising such a polyamide. ... | 07/01/2008 |
| 7317070 | Process for the preparation of polyamino acids Among the various aspects of the present invention is an improved process for the preparation of polyamino acids generally, and more specifically, polyglutamic acid and polyaspartic acid. Another aspect is a process for the large scale (i.e. >1 kg) preparation of po... | 01/08/2008 |
| 7294672 | Method to form polymeric materials by reverse suspension/emulsion polymerization and compositions formed using that method A method to form a polymeric material is disclosed. The method provides a water immiscible solvent and one or more condensation monomers, where those one or more condensation monomers are essentially insoluble in the water immiscible solvent. The one or more condens... | 11/13/2007 |
| 7138482 | Production method of polyamide In the production method of polyamide of the present invention, the mole balance at a set point during melt polymerization is estimated from a pre-established equation for calculating the mole balance during melt polymerization from a melt viscosity. On the basis of... | 11/21/2006 |
| 7135428 | Catalyst solution for implementing anionic lactam polymerization, method for production thereof and polyamide moulding compound A catalyst solution for the anionic polymerization of lactones and/or lactams comprises a salt of at least one compound of the general formula I In this formula (I), R1 is H or an aliphatic, cycloaliph... | 11/14/2006 |
| 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 introduced before or during the polymerization of the polyamide. The... | 07/11/2006 |
| 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 component comprising 70 mol % or higher of a mixed dicarboxylic acid whic... | 05/30/2006 |
| 7049391 | Method for reducing the caprolactam content of polyamide 6, a polyamide 6 and use thereof The invention relates to a method for reducing the caprolactam content of polyamide 6 obtained especially by hydrolytic polymerization of epsilon-caprolactam. The method is characterized by the use of an additive that forms isocyanuric acid under the influence of he... | 05/23/2006 |
| 7023012 | Formulation for depositing a conjugated polymer layer A formulation for depositing a polymer layer in the production of a light-emissive device, the formulation including a conjugated polymer dissolved in a solvent, the solvent including a trialkyl-substituted aromatic hydrocarbon, at least two of the alkyl substituent... | 04/04/2006 |
| 7009030 | High-melting wax useful for sintering metals A wax containing the reaction product of: (a) a C6–C12 linear dicarboxylic acid; and (b) a diamine of formula H2N(CH2)nNH2, wherein n is an integer from 2 to 6, and the molar ratio of the C6 | 03/07/2006 |
| 6995233 | Process for manufacturing polyamides The invention relates to a continuous process for manufacturing polyamides. The polyamides are of the type obtained from diacids and diamines. The process comprises an operation of continuous mixing of a compound which is rich in amine end groups and a compound whic... | 02/07/2006 |
| 6965001 | Organic-inorganic hybrid polymer materials with compositional gradient, and processes for preparing the same According to the present invention, organic-inorganic hybrid polymer materials with compositional gradient, and processes for preparing the same are provided. In the organic-inorganic hybrid polymer materials with compositional gradient, formation of cracks, removal... | 11/15/2005 |
| 6958381 | Polyamide A process for preparing polyamides comprises polymerizing starting monomers in the presence of from 2.3 to 10 mmol, based on 1 mol of carboxamide group of the polyamide, of a chain regulator containing a nitrile group and a functional group capable of forming a carb... | 10/25/2005 |
| 6916901 | Production of polyamide The present invention provides a method for the production of polyamide 6 by the hydrolytic polymerization of ε-caprolactam, in which, in the first step, caprolactam ring opening occurs under the action of water and, in the following steps, polycondensation is perf... | 07/12/2005 |
| 6906165 | Copolyamides and compositions based on same The invention concerns copolyamides obtained by using multifunctional monomers. It consists in using a multifunctional monomer comprising at least three reactive functions and at least another multifunctional monomer, in amounts such that the terminal group concentr... | 06/14/2005 |
| 6884865 | Copolyamides and compositions based on same The invention concerns copolyamides obtained by using multifunctional monomers. It consists in using at least one multifunctional monomer comprising at least three reactive functions and at least another multifunctional monomer, in amounts such that the terminal gro... | 04/26/2005 |
| 6881819 | Liquid initiator for carrying out anionic lactam polymerization in an accelerated manner, method for the production thereof and its use The invention relates to a liquid initiator for carrying out anionic lactam polymerization. The liquid initiator contains a conversion product of isocyanate (1) with a protic compound (P) and a base (B) in an aprotic solvation agent (S). ... | 04/19/2005 |
| 6881477 | Method for producing a polyamide compound A method is disclosed for producing a polyamide molding compound which includes the following method steps: addition and dissolving of m-xylylene diamine and dicarboxylic acids, which include adipic acid and aromatic dicarboxylic acids, with water and additives in a... | 04/19/2005 |
| 6878798 | Method for producing a polymer, using caprolactam A process for preparing a polymer, which comprises a) reacting a mixture (I) containing 6-aminocapronitrile and water in the presence of a catalyst to obtain a mixture (II) containing caprolactam, ammonia, water, high boilers and l... | 04/12/2005 |
| 6875838 | Process for reducing caprolactam and its oligomers in nylon-6 pre-polymer Disclosed is a process for reducing low molecular weight impurities, namely caprolactam and its oligomers, from Nylon-6 pre-polymer during the preparation of Nylon-6 polymer. ... | 04/05/2005 |
| 6872800 | Hyperbranched copolyamide, composition based on said hyperbranched copolyamide and method for obtaining same The invention relates to hyperbranched copolyamides (HBPAs), to their production and to their use as additives, in particular as melt viscosity modifiers in thermoplastic polymer compositions. This copolyamide is obtained by a reaction between a monomer (I): ... | 03/29/2005 |
| 6864354 | Modified polyamides, polyamide compositions, and method for making same The invention relates to modified polyamides, and more particularly to polyamides containing units of the type obtained by reacting a diacid with a diamine, modified with a multifunctional compound. The finished articles shaped from these polyamides or from composit... | 03/08/2005 |
| 6852829 | Process for the simultaneous preparation of polyamides with at least two different viscosities A process for the simultaneous preparation of polyamide-6 with at least two different viscosities comprising prepolymerisation of ε-caprolactam and/or other polyamide-6 precursors in the presence of water, wherein at least part of the necessary water is supplied to... | 02/08/2005 |
| 6846901 | Liquid initiator for accelerating the progress of the anionic lactam polymerization, method for producing the same and the use thereof The invention relates to a liquid initiator to be used in anionic lactam polymerization. Said liquid initiator contains a reaction product of carbodiimide with a protic compound and a base in an aprotic solvation agent. ... | 01/25/2005 |
| 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 mol % or more of a C4-C20 α, ω-straight-chain aliphatic dicarboxyli... | 01/11/2005 |
| 6828413 | Process for the preparation of a polyamide The invention relates to a process for the preparation of a polyamide comprising at least a step in which a composition that comprises at least (a) a primary aminocarbonamide and (b) an aminocarboxylic acid and/or a lactam is polymerised, said composition comprising... | 12/07/2004 |
| 6818732 | Transition metal initiators for controlled poly (beta-peptide) synthesis from beta-lactam monomers A series of initiators based on transition metal complexes for the polymerization of optically active beta-lactams into poly-beta-peptides and block copolymers have been developed. These initiators are unique in being able to eliminate chain transfer and chain termi... | 11/16/2004 |
| 6815527 | Continuous method for producing polyamides from aminonitriles The continuous process for preparing a polyamide by reacting at least one aminonitrile with water comprises: (1) reacting at least one aminonitrile with water in the presence of an organic liquid diluent at from 90 to 400° C. and ... | 11/09/2004 |
| 6812324 | Method for preparing nylon 6 copolymer containing sulfonate comonomers A method for preparing nylon 6 copolymer containing 5-sulfoisophthalate salts comonomer. The method includes the steps of reacting 5-sulfoisophthalate salts ester with aliphatic diamine in a molar ratio of 2˜20 at 160˜200° C., followed by completely removing the ... | 11/02/2004 |
| 6812322 | Polyamide A process for the preparation of novel polyamides, the use of such polyamides for the production of fibers, sheets and moldings, and fibers, sheets and moldings obtainable from such polyamides, are provided. ... | 11/02/2004 |
| 6809173 | Anionically produced polyamide and method for the production thereof and also a method for reprocessing polyamide The invention relates to a polyamide with low viscosity degradation after remelting which can be produced by anionic polymerization of lactam in the presence of alkaline catalysts and if necessary activators and the method for production of the polyamide. The invent... | 10/26/2004 |
| 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 performance. The modified polyamide may be prepared by polymerization of poly... | 08/31/2004 |
| 6777526 | OPTICALLY ACTIVE MALEIMIDE DERIVATIVES, OPTICALLY ACTIVE POLYMALEIMIDE DERIVATIVES, PRODUCTION METHOD THEREOF, SEPARATING AGENT USING THE SAME DERIVATIVE, AND METHOD FOR SEPARATING OPTICALLY ACTIVE COMPOUNDS USING THE SAME AGENT A separating agent that serves as an optical resolution agent is composed of a novel, useful optically active polymer. The separating agent is obtained through anionic polymerization of a novel maleimide and serves to separate optically active compounds. ... | 08/17/2004 |
| 6774205 | Polyamides A process for the preparation of novel polyamides, the use of such polyamides for the production of fibers, sheets and moldings, and fibers, sheets and moldings obtainable from such polyamides, are provided. ... | 08/10/2004 |
| 6759505 | Single-phase or multi-phase continuous polyamide polymerization processes There is provided a process for the continuous polymerization of polyamides which is carried out under conditions of pressure, temperature and polymer concentration in water that will ultimately yield multiple phases (including a second liquid polymer phase or a pol... | 07/06/2004 |
| 6703475 | Method for the continuous production of copolyamides based on a lactam (I), a diamine (II) and a dicarboxylic acid (III) A process for continuous production of copolyamides based on a lactam (I), a diamine (II) and a dicarboxylic acid (III) comprises reacting a mixture (IV) comprising a diamine (II), a dicarboxylic acid (III) and water in a first reaction zone at a pressure ... | 03/09/2004 |
| 6703476 | Method for the production of polyamides Polyamides are prepared from aminonitriles and water by (1) reacting the aminonitriles with water at from 180 to 350° C. and such a pressure in the range from 30 to 120 bar that a gaseous phase is present as well as a liquid phase, in a first reaction sta... | 03/09/2004 |
| 6699960 | Method for producing polyamides from dinitriles and diamines A polyamide is prepared by reacting at least one dinitrile and at least one diamine with water at a temperature from 90 to 400° C. and a pressure from 0.1 to 50*106 Pa in a molar ratio of at least 1:1 for water to the sum total of dinitrile an... | 03/02/2004 |
| 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 subjected to the solid-phase drying or the solid-phase polymerizat... | 02/17/2004 |
| 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 distributed along the chain, whereas the unsaturated groups are ... | 01/20/2004 |
