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| Number | Title | Issue Date |
| 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 (a) a hydroxy-, or aminefunctional monomer, oligomer or polymer is c... | 08/15/2006 |
| 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 |
| 6903181 | Methods of synthesis of polysuccinimide, copolymers of polysuccinimide and derivatives thereof Disclosed are methods of synthesis of polysuccinimide, copolymers and derivatives thereof: also disclosed are methods of forming derivatives by ring-opening initiation reactions. ... | 06/07/2005 |
| 6887971 | Synthesis of polysuccinimide and copoly(succinimide-aspartate) in a supercritical fluid Disclosed are methods of synthesis of polysuccinimide and a copoly(succinimide-aspartate) using a supercritical fluid. ... | 05/03/2005 |
| 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 |
| 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 |
| 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 |
| 6663962 | Process for the preparation of porous powders formed of copolyesteramides and powders thus obtained For the preparation of powders formed of copolyesteramides by anionic polymerization, at least one lactam and at least one lactone are copolymerized in solution in a solvent in the presence of a catalyst and of an activator, the solvent being a solvent of... | 12/16/2003 |
| 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 grafted with polysaccharides, wherein at least a portion of the ... | 11/25/2003 |
| 6579965 | Process for the anionic polymerization of lactams For the anionic polymerization of lactams: (a) (i) a catalyst capable of creating a lactamate and (ii) a regulator chosen from amides of formula R1-NH--CO-R2, in which R1 can be substituted by an R3-CO--NH-- or R3-0-- radical and in which R1, R2 and R3 de... | 06/17/2003 |
| 6569988 | Method for the production of polyamides In a process for producing polyamides, a mixture comprising hexamethylenediamine and aminocapronitrile and obtained from the hydrogenation of adiponitrile is reacted with water and a dicarboxylic acid.... | 05/27/2003 |
| 6548626 | Method for preparing polyamides from lactams and polyamide extracts A process for producing polyamides by reacting at least one lactam and optionally further polyamide-forming monomers with aqueous monomer and oligomer extracts obtained during the extraction with water of the polymer product obtained in the production of ... | 04/15/2003 |
| 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 groups in a reactor with water, and reacting amine and carbo... | 04/01/2003 |
| 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. Polymerization proceeds by reaction of an amine group of a first mon... | 04/01/2003 |
| 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 carboxylic acids, anhydrides of unsaturated carboxylic ac... | 12/17/2002 |
| 6482917 | Method for producing powder-shaped cross-linked polymerizates A process for the preparation of pulverulent, cationic, crosslinked polymers based on monoethylenically unsaturated monomers containing a quaternized or quaternizable nitrogen atom comprises carrying out the polymerization in supercritical carbon dioxide ... | 11/19/2002 |
| 6320018 | Supramolecular polymer A polymer comprising monomeric units linked via 4 H-bridges and bound within said polymer via a different bond. The bond via the H-bridges is much stronger than with known supramolecular polymers.... | 11/20/2001 |
| 6103863 | Process for preparation of polyamide from dinitrile and diamine A two-step process for the production of polyamides from ,ω-dinitriles and ,ω-diamines involving the catalytic hydrolysis of the ,ω-dinitrile by addition of water with simultaneous purging of the reactor (i.e., venting of ammonia a... | 08/15/2000 |
| 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 dinitrile and in the presence of from 0.01 to 0.5 moles of a dica... | 07/04/2000 |
| 6075117 | Process for the hydrolysis of adiponitrile and the production of nylon 6,6 using dicarboxylic acids as the sole catalyst A process for the hydrolysis of a dinitrile (e.g., adiponitrile) utilizing a dicarboxylic acid (e.g., adipic acid) as the sole catalyst followed by addition of a diamine (e.g., hexamethylenediamine) and heating to produce polymerization. Such a process is... | 06/13/2000 |
| 6027804 | Superabsorbing compositions and processes for preparing same Superabsorbent polymer compositions comprising a fiber-containing composition derived from cellulosic fibers, synthetic fibers or mixtures thereof which is at least partially coated with a partially hydrolyzed, internally plasticized, crosslinked, superab... | 02/22/2000 |
| 6013758 | Method for producing a liquid system for lactam polymerization A method for the production and use of a catalytically-acting liquid system is offered, which has no or only a small proportion of free lactam, and which is of low viscosity and good storage stability and which directly initiates the anionic lactam polyme... | 01/11/2000 |
| 5998571 | Method for manufacturing shaped parts by polymerization of lactams in molds A method for manufacturing shaped parts by polymerization of lactams in a mold includes the steps of providing a melt consisting of at least one catalyst, at least one activator, and amino-terminated polyethers in a mold and providing as the catalyst a 17... | 12/07/1999 |
| 5962412 | Method of making polymers having specific properties A method of making a polymer having specific physiochemical properties by forming a first module having a structure which includes at least two structural diversity elements suitable to impart a desired physical property to a polymer which is made from sa... | 10/05/1999 |
| 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 organic radical which contains at least one aromatic ... | 02/02/1999 |
| 5866673 | Polymerizable derivatives of polyamides The invention relates to polymerisable double-bond derived polyamides obtainable by reacting the polyamide in an aqueous solution with a compound which contains both a polymerisable double bond and an oxirane ring. These derived polyamides may be processe... | 02/02/1999 |
| 5864007 | Liquid system for executing an anionic lactam polymerization A liquid system for executing the anionic lactam polymerization is proposed, which contains activator as well as catalyst and selectively additives and which is liquid at room temperature and remains stable when stored.... | 01/26/1999 |
| 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 R1, R2, R3 and R4 are alkyl, aryl and ar... | 01/12/1999 |
| 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 thermal linear expansion coefficient at 200°-300° C. within &#... | 01/05/1999 |
| 5824763 | Process for the manufacture of nylon compositions with improved flow A process is disclosed for preparing a polyamide by polymerizing a diacid and a diamine, aminocarboxylic acid or lactam in the presence of excess of either acid or amine such that the ratio of acid to amine end groups or the ratio of amine end groups to a... | 10/20/1998 |
| 5789534 | Process for purifying a fluorinated polyether having at an end thereof a terminal vinyl group linked thereto through an amide group-containing linkage The purification process comprises removing carboxylic acids and/or carboxylic acid salts contained as impurities in a fluorinated polyether having at at least one end thereof a terminal vinyl group linked thereto through an amide group-containing linkage... | 08/04/1998 |
| 5780579 | Method for the preparation of polyamino acids The present invention relates to a method for the preparation of polyamino acids, with controlled molecular weights, by polymerization of N-carboxyanhydrides (NCAs) of at least one amino acid, using at least one initiator of the strong base type and in li... | 07/14/1998 |
| 5773555 | Method and apparatus for the production of polyamides There are proposed a method and a device for manufacturing polyamides, in which polyamide granulate manufactured by polycondensation in the molten mass is after-condensed in the solid phase, being heated. The polyamide granulate is heated in one step to a... | 06/30/1998 |
| 5756646 | Agent for improving surface quality of paper An agent for improving surface quality of paper comrising an acrylamide resin composition obtained by hydrolyzing an acrylamide resin which is obtained by polymerizing an acrylamide monomer in the presence of a urea compound, or copolymerizing an acrylami... | 05/26/1998 |
| 5747634 | Continuous process for activated anionic lactam polymerization A continuous process for activated anionic lactam polymerization is proposed, wherein a liquid system is employed, which simultaneously contains activator and anionic catalyst for the polymerization of lactam.... | 05/05/1998 |
| 5744574 | Isomaleimides and polymers derived therefrom Isomaleimides and polyisomaleimides can be prepared by a method comprising the steps in sequence: admixing a maleamic acid or polymaleamic acid with an acid halide, reacting the admixture with a tertiary amine at a temperature sufficiently low to suppress... | 04/28/1998 |
| 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 R1 is a C2-11 alkylene group optionally substituted with a substituent having 1 to 6 carbon atoms, with a hexameth... | 03/03/1998 |
| 5712331 | Curable epoxy compositions containing aziridine in supercritical fluid carbon dioxide A curable resin system in supercritical carbon dioxide as diluent includes an epoxy resin, a co-reactant selected from poly N-substituted aziridines, and a catalyst to promote cure at ambient temperature. The system is compatible with various epoxy resins... | 01/27/1998 |
| 5703199 | Process for the preparation of nitrogen-containing polymers To prepare nitrogen-containing aromatic polymers, for example polyamides, polyimides and polybenzimidazoles, polyvalent aromatic carboxylic acids and aromatic diamines and/or aminocarboxylic acids or reactive derivatives thereof are reacted in a high-boil... | 12/30/1997 |
| 5696227 | Process for the batchwise preparation of polylaurolactam A process for the batch preparation of polylaurolactam in the melt, involving introducing molten, anhydrous laurolactam at a temperature of up to 280° C. into a pressure-resistant reactor heated externally to a maximum of 290° C.; introducing steam havi... | 12/09/1997 |
