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7537782 |
Methods for governing bone growth
Resorbable polymer barrier membranes and methods of their applications are disclosed. In a broad embodiment, methods of governing bone growth, or preventing bone growth into a certain spatial area,...
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7470765 |
Method for producing polyamides
A process for preparing a polyamide by reacting a mixture which comprises a monomer which has a nitrile group and has at least one other functional group capable of forming a carboxamide group, and...
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7428857 |
Gear, speed reduction gear using the same, and electric power steering apparatus using the same
A gear composed of a polymer blend or a copolymer of PA66 and PA6 which contains a part having a PA66 molecular structure and a part having a PA6 molecular structure in a weight ratio of...
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7388048 |
Flexible semiaromatic polyamides with a low moisture uptake
The present invention relates to a flexible semiaromatic polyamide composition with a low moisture uptake comprising, by weight, the total being 100:
60 to 99.5% (preferably 70 to 93%) of at...
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7381788 |
Method for continuous production of polyamide
Provided is a continuous production method of a polyamide with stabilized polymerization degree and good quality, particularly an aromatic-containing polyamide. A continuous production method of a...
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7303792 |
Diaminobenzene derivative, polyimide precursor and polyimide obtained therefrom, and aligning agent for liquid crystal
The present invention provides a novel diamine which is especially useful as a material for a resin for a liquid crystal alignment film, a polyimide precursor and a polyimide synthesized by using...
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7160979 |
Polyamides
The reaction of dimer acids, C 6 to C 18 aliphatic dicarboxylic acids, dimer amines, alkylene diamines having from 2 to 8 carbon atoms, and polyoxyalkylene diamines provides polyamides having...
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7022214 |
Carrier ampholytes of high pH range
Carboxylic acid-substituted polyalkylene polyamines in which amine nitrogen atoms on the polyamine backbone structure are replaced by guanidine groups provide a pH range extending into high pH...
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6916919 |
Isolation of DNA molecules
The present invention relates to a process for separating nucleic acid molecules, preferably open circular and supercoiled plasmid DNA and RNA molecules from each other, comprising the steps of...
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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. ...
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6835799 |
Intrinsically gel-free, randomly branched polyamide
The invention relates to a randomly branched polyamide comprising at least units derived from: 1. AB monomers, 2. at least one compound I, being a carboxylic acid (A v ) having a functionality...
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6831137 |
Impact resistant transparent polyamide alloys
The invention concerns a transparent polyamide alloy, produced by compounding it from 30-98% by weight of a transparent, amorphous, rigid and brittle polyamide A with at least 35 mole %...
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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...
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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...
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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...
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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...
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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*10 6 Pa in a molar ratio of at...
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6590063 |
Low-melting copolyamide and their use as hot-melt adhesives
Copolyamides, consisting of polycondensation products of the following components: caprolactam 10 to 45 mol-%, laurolactam 30 to 55 mol-%, at least 2 dicarboxylic acids 20 to 50 mol-% of the...
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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...
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6569598 |
Solvent resistant photosensitive compositions
Photoresist compositions and methods are provided for preparing photoresist films that are stable and impermeable to a broad range of organic solvents. Photoresist films provided herein may be...
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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...
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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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6525167 |
Method for producing polyamide 6 of a low extract content, high viscosity stability and low remonomerization rate
The continuous process for producing polyamides by reacting at least one aminonitrile with water comprises the following steps: (10) reacting at least one aminonitrile with water at a temperature...
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6509439 |
Process for the production of polyamides from dinitriles and diamines
A process for producing polyamides from dinitriles and diamines in a continuous reaction using subsequent heating steps. In particular, the process involves contacting a dinitrile, a diamine,...
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6479620 |
Process for converting caprolactam to nylon 6
A process for making nylon 6, in which caprolactam and water are reacted in a multistage reactive distillation column.
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6472501 |
Process for making nylon 6,6
Process for making Nylon 6,6 by reacting adiponitrile, hexamethylenediamine and steam in a multistage distillation column reactor.
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6423304 |
Dimerized fatty acid based polyamides useful for clear candle and gel applications
Blooming and/or syneresis in gel formulations can be reduced or eliminated by adding to an organic mixture an effective amount of a polyamide gelling agent having a softening point of less than...
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6391982 |
Highly branched polyamide graft copolymers
A graft copolymer is prepared by a process comprising: graft polymerizing a polyamide-forming monomer selected from the group consisting of lactams and ω-aminocarboxylic acids and an...
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6355769 |
Partially aromatic polyamides and a process for making them
A process for making partially aromatic polyamides is provided in which an aromatic dicarboxylic acid component, at least 20-100% by weight of the dicarboxylic acid in the acid component is in the...
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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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6297345 |
Polyamide having excellent stretching properties
A polyamide with excellent stretching properties is disclosed, which comprises 50 to 99.8 mol % of a unit derived from a lactam and/or an aminocarboxylic acid, 0.1 to 25 mol % of a unit derived...
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6288207 |
Continuous method for producing polyamides from aminonitriles
The continuous process for producing a polyamide by reacting at least one aminonitrile with water comprises the following steps: (1) reacting at least one aminonitrile with water at a temperature...
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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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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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6242509 |
Gels including bioactive components
An ester-terminated dimer acid-based polyamide may be blended with a solvent to form a gel. The solvent may be flammable, and a wick may be added to the resulting gel so as to form a candle....
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6228976 |
Method of manufacturing polyamides
The invention relates to a method of preparing polyamides, in which, in a first step, the anionic polymerization of at least one lactam is carried out and then, in a second step, a heat treatment...
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6204355 |
Use of polyamide moulding compounds for manufacturing optical or electro-optical moulded members
The invention relates to the use of polyamide moulding compounds, their alloys or blends, which contain at least one homopolyamide, which has been obtained from long-chained aliphatic monomer...
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6197920 |
Formulation for the production of 1, 3-bis (4-aminophenoxy) naphthalene and its polymer
The present invention relates to the synthesis of new type of diamine monomer, 1,3-bis(4-amonophenoxy)naphthalene, and with such a compound to produce a series of aromatic polymers, including...
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6194538 |
Process for producing polyamides from aminonitriles
A process for preparing a polyamide by reacting at least one aminonitrile with water comprises: (1) reacting at least one aminonitrile with water at a temperature from 100 to 360° C. and a...
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6169162 |
Continuous polyamidation process
A process for producing a polyamide from dicarboxylic acid monomer and diamine monomer comprises the steps of: (a) mixing molten dicarboxylic acid monomer and molten diamine monomer in equimolar...
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6169160 |
Cable protectant compositions
Substrates that are moisture-sensitive and/or corrosion-sensitive, such as electrical components found in fiber optic cables, copper wires, terminal blocks, connections and junctions, are protected...
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6143862 |
Copolyamides and polyamide compositions, process of manufacture and applications
Colpolyamides resulting from the polycondensation of a mixture of (a) dodecanelactam (L12) or of 12-aminododecanoic acid (A12) and of (b) 11-aminoundecanoic acid (A11) are characterized in that the...
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6111055 |
Ester-terminated polyamide gels
An ester-terminated dimer acid-based polyamide may be blended with a solvent to form a gel. The solvent may be flammable, and a wick may be added to the resulting gel so as to form a candle....
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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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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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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...
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5998570 |
Ester-terminated polyamides of polymerized fatty acids useful in formulating transparent gels in low polarity liquids
A low molecular weight, ester-terminated polyamide may be blended with a liquid hydrocarbon to form a transparent composition having gel consistency. The ester-terminated polyamide is prepared by...
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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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5917001 |
Lens for lighting systems
An uncoated lens, especially for use as the lens of a fog light or a headlight for an automobile, and having particularly good resistance against the environmental effects which are inherent in...
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5880252 |
Pyrrolidonyl-containing polyesters and polyamides
Pyrrolidonyl-containing polyesters and polyamides I to III ##STR1## where R, X, A and Z are defined herein, are suitable as film formers and conditioners in hair-cosmetic formulations, for...
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