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5543492 |
Hydrolysis-resistant aramids
Aramid polymers with small amounts of alkyl- and/or alkoxy-substitution on their aromatic diamine and/or aromatic diacid monomeric units are disclosed. Such aramid polymers show improved properties...
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5539079 |
Amidation catalyst concentrates
Disclosed is a process for preparing nylon by adding an amidation catalyst concentrated in "masterbatches" to the process melt resulting in a product with increased molecular weight and viscosity.
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5532334 |
Process for preparing polyamideimide resins having high molecular weight
A process for preparing polyamideimide resins having high molecular weights as described wherein major problems of prior art processes such as low heat resistance and low melt flowability are...
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5519107 |
Amine-functionalized polyester
Novel polyesters prepared from a diol, a dicarboxylic acid or ester forming reactive derivative thereof and an aromatic amino acid, ester or alcohol are disclosed.
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5516881 |
Aminoxyl-containing radical spin labeling in polymers and copolymers
Aminoxyl-containing radical is provided in polymers and copolymers by replacing a hydroxyl moiety in a carboxyl group at a chain end of a starting material biodegradable polymer or copolymer with...
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5514322 |
Rim method of molding thermoplastic resin
An RIM method of thermoplastic resin comprises a process for preparing materials in which one compound (i) is mixed with a material for thermoplastic resin to prepare one mixture (I), and the other...
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5510455 |
Thermotropic polymers containing 2,5-dicarboxythiophene units
A new class of thermotropic liquid crystalline polymers comprises monomers units I, II, III, and IV, where ##STR1## Ar 1 , Ar 2 and Ar 3 are each independently selected from the group consisting...
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5508380 |
Fluorinated polymers containing perfluoropolyoxyalkylene sequences and having thermoplastic elastomeric properties
Fluorinated polymers having thermoplastic elastomeric properties comprising in the macromolecule perfluoropolyoxyalkylene sequences of formula: --CF 2 O--(CF 2 CF 2 O) m --(CF 2 O) n --CF 2...
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5506336 |
Continuous process for preparing a synthetic linear, fiber-forming polyamide
The present invention relates to an apparatus for processing materials, a process for mixing, finishing and de-volatizing polyamide to make 66 nylon and the 66 nylon made by this process. The...
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5506060 |
Method for making multidimensional ether or ester oligomers
Crosslinkable, polyaromatic, polyether or polyester oligomers can have glass transition temperatures above 900° F. while exhibiting desirable toughness for aerospace applications and ease of...
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5502155 |
Manufacture of partially aromatic polyamides
A process for the manufacture of a partially aromatic polyamide is disclosed. The process comprises the polymerization stages of, in sequence, feeding to a reactor a slurry of at least one aromatic...
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5502156 |
Electrically conducting polyimide film containing tin complexes
Disclosed is a thermally-stable SnO 2 -surfaced polyimide film wherein the electrical conductivity of the SnO 2 surface is within the range of about 3.0×10 -3 to about 1×10 -2 ohms -1 ,. Also...
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5502154 |
Apparatus for processing materials
The present invention relates to an apparatus for processing materials, a process for mixing, finishing and de-volatizing polyamide to make 66 nylon and the 66 nylon made by this process. The...
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5496922 |
Decolorization of polysuccinimide
There is disclosed a process for decolorizing polysuccinimide by means of contacting the polysuccinimide in the solid state with an aqueous solution of a bleach. Typically, polysuccinimide is...
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5494991 |
Polyimides and processes for preparing the same
Polyimides comprising recurring units of the following general formula (1) ##STR1## wherein Ar 1 represents a tetravalent aromatic group and each Ar 2 represents a divalent aromatic group....
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5493002 |
Aryl ethynyl phthalic anhydrides and polymers with terminal or pendant amines prepared with aryl ethynyl phthalic anhydrides
Arylethynyl phthalic anhydrides have been synthesized and shown to have particular application as endcappers or pendant groups in high performance/high temperature thermosets which include amine...
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5493000 |
Fractal polymers and graft copolymers formed from same
This invention relates to a branched fractal three dimensional porous polymer species which comprises rigid aromatic recurring units having electrophilic or nucleophilic reactive moieties on the...
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5491212 |
Method for preparing polysuccinimides using a rotary tray dryer
A method for producing polysuccinimides is provided. A rotary tray dryer operating at an internal temperature of from about 110° to about 300° C. and providing a residence time of from about 1...
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5483009 |
Polymer derived from cyclic amide and medical devices manufactured therefrom
A moldable and/or extrudable polymer which is useful for the manufacture of surgical devices such as sutures, staples, clips, etc., possesses structural units derived from a cyclic amide monomer...
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5478914 |
Polyimides and processes for preparaing the same
Polyimides comprising recurring units of the following general formula (1) ##STR1## wherein R 1 represents a tetravalent aromatic group. Polyimide copolymers and preparations of the polyimides and...
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5478918 |
Low stress polyimide composition and precursor composition solution of same
A polyimide precursor composition solution includes a tetracarboxylic acid component containing not less than 70 mol % of at least one selected from the group consisting of benzenetetracarboxylic...
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5473047 |
Soluble precursor to poly (cyanoterephthalydene) and method of preparation
A method of preparing a lass of PPV derivatives includes preparing a soluble precursor of a PPV derivative and converting the soluble precursor to a PPV derivative. The converting includes...
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5459227 |
Aminoimides
Bis-N-aminoimides of formula (III): ##STR1## wherein m is 0 or 1 and is a mono- or polycyclic aromatic radical, can be employed to produce a variety of polymers of the type produced from...
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5459230 |
Copolyamide melt adhesives for heat sealing textiles
The use of copolyamides as melt adhesive for heat sealing is disclosed. At least three monomer components are copolymerized in the copolyamide. These monomer components are selected from the...
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5449748 |
Preparation of anhydropolyamino acids at temperatures of 350° C. or above
There is disclosed a process for preparing polysuccinimide by thermal condensation of L-aspartic acid to produce polysuccinimide wherein the L-aspartic acid is exposed to an atmosphere in excess of...
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5446108 |
Polymer derived from cyclic amide graft copolymer and medical devices manufactured therefrom
A moldable and/or extrudable polymer which is useful for the manufacture of surgical devices such as sutures, staples, clips, etc., possesses structural units derived from a cyclic amide monomer...
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5442029 |
Methods of preparing polymeric ketones
A new method for preparing commercially valuable polymeric ketones is described. The method employs an α-amiononitrile as a monomeric unit whereby an amorphous, soluble polymer having protected...
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5432248 |
Thermotropic polyesterimide, a process for its preparation, and its use
A thermotropic polyesterimide, in which the liquid-crystalline phase is of nematic structure within a useful temperature range, consists of units of formula: ##STR1## the units being in the...
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5414069 |
Electroluminescent polymers, processes for their use, and electroluminescent devices containing these polymers
An electroluminescent polymer comprises a main chain and a plurality of side chains, each of the side chains comprising an electroluminescent group and a flexible spacer connecting the...
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5414070 |
Poly(amide-ether-imide)s
Disclosed is a poly(amide-ether-imide) and the preparation of the same. An ether chain-containing aromatic diamine is subject to thermal condensation with trimellitic anhydride (TMA) in a polar...
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5410015 |
Polyamides having a low water absorptivity
Thermoplastic polyamide molding materials contain, as essential components, A) from 39 to 99% by weight of a polyamide or a mixture of different polyamides and B) from 1 to 30% by weight of a...
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5405936 |
Liquid-melt aliphatic dicarboxylic acids
Liquid-melt aliphatic dicarboxylic acids tend to undergo undesirable discoloration during prolonged storage. The discoloration can be avoided by an addition of 0.1 to 3.0% by weight of a primary...
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5399662 |
Strong non-ionic base catalyzed ring opening polymerization of lactams
Process for the ring opening polymerization of lactams to higher molecular weight polyamide polymers utilizing non-ionic polymerization catalyst base with a pKa of equal to or greater than 30,...
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5393872 |
Sheetlike wholly aromatic polyamide shaped article and a method for producing the same
This invention relates to a sheetlike wholly aromatic polyamide shaped article useful as electrical insulating materials excellent in corona resistance (corona durability) and in surface...
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5391697 |
Method of producing a thermosetting esterimide oligomer
Thermosetting esterimide oligomers of formulas (IA) and (IB) are disclosed: ##STR1## where A 1 , A 2 and A 4 are divalent organic groups, A 3 is a monovalent organic group and A 1 , A 2 , A 3 ...
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5387651 |
Block copolyetheramide suitable for injection molding and process for preparing it
Block copolyetheramide suitable for injection molding, consisting of polyamide blocks and polyalkylene ether blocks and having a melting point ranging from 215° to 223° C., an apparent viscosity,...
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5380818 |
High modulus aromatic polyamide film and production thereof
A novel aromatic diamino amide monomer of the structural formula (I), a novel aromatic polyamide of the structural formula (II) prepared by polycondensation of the monomer and an aromatic diacid...
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5378798 |
Composition and process for coating metallic substrates
Disclosed are polyamides which are the reaction product of (A) an acid component of which 15-99 wt. % comprises one or more saturated or unsaturated dibasic C 28 -C 44 carboxylic acid, 1-50 wt. %...
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5378537 |
Polyester monofilament
The polyester monofilament of this invention has a terminal carboxyl group concentration of not more than 10 equivalent weights/10 6 g and contains an unaltered carbodiimide compound in an amount...
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5376499 |
Highly heat-resistant positive resists comprising end-capped hydroxypolyamides
Cost-effective, highly heat-resistant positive resists based on oligomer and/or polymer polybenzoxazole precursors and diazo quinones possess a high [level of] stability in storage when the...
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5371183 |
Preparation of urethane from polyamine and carbon dioxide
The present invention provides a process for preparing urethanes and carbonates from an amine or an alcohol, carbon dioxide and a hydrocarbyl halide. The amine or alcohol is reacted with carbon...
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5371179 |
Polysuccinimide polymers and process for preparing polysuccinimide polymers
Polysuccinimide polymers of from about 5 to 100 percent by weight of methylenesuccinimide moieties, and from 0 to about 95 percent by weight of one or more amino acid moieties are provided. A...
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5357004 |
Copolymers of polyaspartic acid
Higher molecular weight copolymers of polyaspartic acid which are suitable for the inhibition of scale deposition may be obtained by reacting maleic acid and ammonia in a stoichiometric excess,...
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5346984 |
Star-shaped nylons, methods for their preparation, tetrasubstituted carboxylic acids and methods for their preparation
Star-shaped nylons with low melt viscosities and excellent mechanical properties, methods for their preparation, a novel tetrasubstituted carboxylic acid for use as a polymerization core therefor...
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5347394 |
Nonlinear optical materials, method of manufacturing the same, and optical wavelength converter
The invention provides a nonlinear optical material comprising a compound represented by the general formula (1): ##STR1## wherein R 1 denotes an electron attractive group, R 2 denotes a group...
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5344708 |
Bulked random copolyamide yarns of nylon 6 and nylon 6,6 having enhanced dyeability
Bulked random copolyamide yarns having enhanced dyeability as compared to comparable nylon 6 fibers are disclosed. The random copolyamides contain from 80 to 96% by weight of nylon 6 units and 4 to...
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5344914 |
Commercially valuable polymeric ketones and method of preparing same
A new method for preparing commercially valuable polymeric ketones is described. The method employs an α-amiononitrile as a monomeric unit whereby an amorphous, soluble polymer having protected...
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5331081 |
Use of fluorinated aromatic polyamides as orientation layer for liquid-crystal switching and display devices
Use of fluorinated aromatic polyamides as orientation layer for liquid crystal switching and display devices Use of substituted aromatic polyamides as orientation layer in liquid crystal switching...
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5326850 |
Molding materials based on unsaturated copolyamides
Molding materials are composed of A) from 40 to 100% by weight of a copolyamide based on a 1 ) from 1 to 20 mol%, based on the copoly- amide, of at least one monomer that contains at least...
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5319047 |
Process for the preparation of maleimide containing compounds
The present invention relates to a process for the preparation of N-(hydroxyphenyl)maleamic acid and various dimers and oligomers thereof. The process is characterized by heating, in the absence of...
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