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4067879 |
1,4-Dithiino[2,3-c; 6,5-c']diisothiazole and related compounds
The compound 3,7-dicyano-1,4-dithiino[2,3-c; 6,5-c']diisothiazole is prepared by reacting either tetracyano-1,4-dithiin or 4,5-dicyano-1,3-dithiolen-2-one with sulfur in 1,2-dimethoxyethane at a...
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4066585 |
Printing inks and printing methods employing the same
Intaglio and flexographic printing processes employing solvent-free inks, solid at room temperature but molten at printing temperatures, are disclosed, as are inks suitable therefor, said inks...
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4059557 |
Polymer dispersions
A process is described for the production of a stable dispersion of a copolymer, in particular of a copolyester, copolyamide or copolyesteramide, in a non-solvent organic liquid. The process...
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4055525 |
Novel polyamide adhesives and method of preparation
Novel polyamide hot melt adhesive compositions are disclosed together with a novel method of preparation. The process of the invention comprises condensation of hexamethylene diamine with an acid...
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4054633 |
Process for continuously preparing shaped articles of aromatic oxadiazole or aromatic oxadiazole/N-alkylhydrazide polymers from monomer solutions
An economical process for continuously producing shaped articles of aromatic oxadiazole or aromatic oxadiazole/N-alkylhydrazide polymers from certain monomer solutions is provided. The process...
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4052493 |
Process for producing conductive fiber
A conductive fiber having soil-hiding properties and good dye light fastness properties comprising a fiber-forming polyamide having an additive dispersed therein as a separate phase, the additive...
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4046748 |
Polymers of terpene-maleic anhydride adducts with aliphatic diamines
There is provided a process for preparing the reaction product of maleic anhydride with a non-conjugated monocyclic terpene in the presence of controlled amounts of iodine to attain a mixture of...
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4045417 |
Production of aromatic polyamides
Aromatic polyamides having high polymerization degree are produced by polycondensing an arylene-containing aminocarboxylic acid, or a dicarboxylic acid with an aromatic diamine in the presence of a...
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4042571 |
Fire-retardant polyamides from naphthalene dicarboxylic reactant and halogenated carboxylic reactant
A process for preparing a fired-retardant polyamide, which comprises polymerizing a carboxylic acid component consisting essentially of at least one naphthalene-dicarboxylic acid selected from the...
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4024185 |
Cycloaliphatic unsymmetrical diamines
Novel cycloaliphatic diamines have been prepared which are consisting of two unequivalent amine groups. The diamines are prepared by reduction of aromatic dinitro compounds. The polyamides made...
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4024115 |
Manufacture of polyamide film containing ester of an aliphatic alcohol
A film of poly(hexamethylenediamine adipate) (nylon 6,6) which contains from 0.01 to 2 per cent by weight of an ester of an aliphatic alcohol of 4 to 10 carbon atoms.
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4011203 |
Aromatic polyamide from piperazine, p-phenylene diamine and terephthaloyl halide
A process for producing novel aromatic polyamides having excellent heat resistance, toughness and chemical resistance and further having improved solubility, molding properties and light...
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4009154 |
Process for preparing aromatic polyamides with sodium carbonate hydrate as acid acceptor
A process for preparing aromatic polyamides which comprising contacting (I) a solution or dispersion consisting of a solution or dispersion in a polar, non-basic and inert organic liquid medium of...
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3996202 |
Process for the preparation of sulfonate group containing aromatic polyamides
Fibers, filaments and sheets from aromatic polyamides which are dyeable with cationic dyestuffs are prepared by solution polycondensation of A. aromatic dicarboxylic acid dichlorides optionally...
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3996203 |
Solution process for the preparation of polyimides from diamines and anhydrides
Novel polyimide prepolymers with improved mold flow characteristics and enhanced physical properties when thermoset, are provided by heating a difunctional amine and an anhydride of an unsaturated...
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3991037 |
Process for preparing filaments, fibers and sheets of aromatic polyamides
Limpid solutions suitable for making filaments and sheets of mostly aromatic polyamides are obtained by precondensation of the initial materials up to a conversion rate of from 80 to 98% in a...
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3987003 |
Thermally stable dioxo and dithio-benzisoquinoline compositions and process of synthesizing same
Thermally stable dioxo and dithio-benzisoquinoline polymers are synthesized by the polycondensation of oxyarylene and thioarylene bis-naphthalic acid dianhydrides and aromatic diamino compounds....
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3984380 |
Difficultly inflammable yarns, fibers and films of phosphorus containing polyesteramides and process for obtaining them
The invention concerns new difficultly inflammable polyesteramide yarns, fibers and films. These yarns, fibers or films consist of a polymer obtained from the reaction of at least one aromatic...
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3966685 |
Difficultly inflammable threads, fibers and films of polyesteramides and process for obtaining them
The invention concerns new difficulty inflammable polyesteramide filaments, threads, fibers and films. These filaments, threads, fibers or films consist of a polymer obtained from the reaction of...
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3960819 |
Catalytic preparation of polyamides from bis(aminophenyl)sulphone
Melt polycondensation of bis(aminophenyl)sulphone with dicarboxylic acid, especially aliphatic dicarboxylic acid, using as catalyst a specified Group VB compound, or metal salt or complex thereof....
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3960818 |
Ordered aromatic copolyamide urea polymer
An ordered copolyamide-urea-type polymer is prepared which is particularly useful for the production of synthetic fibers, films, etc. A representative polymer is that derived from p-phenylene...
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3959232 |
Polyamide from hexahydrobenzodipyrrole
Novel compounds having the following structural formulae: ##SPC1## Are disclosed and polymers formed by condensing the above compounds with anic diacids are prepared which polymers are useful in...
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3943125 |
Substituted tetraamino heterocyclic compounds, useful in the preparation of substituted polybenzimidazoles and poly-imidazopyrrolones
This invention relates to substituted tetraamino pyridines and to methods whereby such compounds are prepared. It also relates to the linear precyclized polymers produced by reaction of substituted...
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3943095 |
Acid dyeable yarn from polyamide having N,N'-di (3-aminopropyl)piperazine moiety units
Yarns of good color characterized by a high capability of being deeply dyed with acid dyes are spun from copolyamides having a relative viscosity of 35-75, an amine end concentration of 35-80 gram...
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3941755 |
Fiber-forming 6TA/6IA copolymers
Copolymers made from hexamethylenediamine and a mixture of tere- and isophthalic acids in which the mixture contains between about 60 and 80 mole percent terephthalic acid are described as well as...
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3937687 |
Amidification products of C.sub.19 dicarboxylic acid and cyclical diamines
Polyamids of a C 19 diacid and certain cyclical diamine which are excellent engineering plastics.
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3937688 |
Copolyamides from an isomeric mixture of heptadecane dicarboxylic acid
Copolyamides of a C 19 diacid, a coacid selected from isophthalic acid, terephthalic acid, alkyl substituted isophthalic acid or esters thereof and a diamine selected from hexamethylene diamine...
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3932364 |
Production of polyamides in the presence of a phosphorus acid ester and an organic base
Polyamides are produced by reacting a dicarboxylic acid with a diamine or polycondensing an amino acid in the presence of a phosphorous acid ester of the formula, R 3 .R 4 .HPO 3 , wherein R 3 and...
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3931119 |
Aromatic carboxamide-sulphonamide polycondensates
New aromatic polyamide-sulphonamides consisting essentially of recurring units of the formula: -- CO -- Ar 1 -- CONH -- Ar 2 -- SO 2 NH -- Ar 3 -- (SO 2 NH -- Ar 4 ) n -- NH -- in which...
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3931118 |
Aminoalkanesulfonate-modified polyamides
Polycarbonamide compositions having improved acid dye-resistance and basic dyeability properties wherein the polycarbonamides contain, as an integral part of the polymer chain, recurring amide...
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3929734 |
Fire-resistant polyamide from brominated aromatic dicarboxylic acid diaryl ester
Fire-resistant thermoplastic brominated semi-aromatic polyamides, obtained by polycondensation of at least one linear or branched alpha-omega diamino-alkane of 4 to 30 carbon atoms with at least...
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3926923 |
Aromatic polyester-amides
There is provided a new and useful class of aromatic polyesteramides having the repeating amide structural unit ##SPC1## Wherein R is a branched or linear C 2 -C 8 alkylene radical and Ar is an...
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3926913 |
Low temperature curing polyimides
A low temperature curing, linear polyimide is produced by substituting diaminostilbene not in excess of 50 mole percent for the primary diamine in the polyimide backbone chain, and upon curing in...
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3923750 |
Process for preparing wholly aromatic polyamides in the presence of an aryl sulfone
High molecular weight wholly aromatic linear polyamides of film and fiber-forming grade are prepared by direct condensation of monomeric aromatic dicarboxylic acids and aromatic diamines in about a...
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3920611 |
Polyacyl-dihydrazino-s-triazines and their preparation
Fiber-forming and film-forming linear polymers which are polyacyl-dihydrazino-s-triazines having recurring structural units of the formula ##SPC1## Wherein R represents a divalent aromatic radical...
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3917561 |
Process for preparing melt-stable poly(dodecamethyleneterephthalamide
Melt-stable, fiber-forming poly(dodecamethyleneterephthalamide) is provided by melt polymerization of a cation-exchange treated dodecamethylenediammoniumterephthalate salt in the presence of a...
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3915939 |
High temperature film forming polyamide polymers
High temperature-resistant polyamides are derived from alkyl substituted aminophenylindanamines and dicarboxylic acids or their derivatives. Films formed from the polyamides are useful in...
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3915884 |
Modified amides for pigments and method for producing the same
A polyfunctional amine is reacted with both a polycarboxylic acid and a monocarboxylic acid to form relatively short chain polyamides in the molecular weight range from about 400 to about 2500,...
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3914195 |
Preparation of solid polyamides useful as ink binders
New polyamides are prepared by reacting (A) a dibasic acid ester of the formula wherein R 1 represents a bivalent vinylidene-type radical having one double bond and R 2 represents a radical which...
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3904705 |
Thermally stabilized synthetic polyamides
Polyamides are stabilized by the incorporation of a mixture of a sterically hindered phenol, a reducing phosphorus compound and sulphur-containing compound selected from a thiophosphate, a...
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3901854 |
Two stage process for preparing aromatic polyamides
High molecular weight aromatic linear polyamides of fiber-forming grade are prepared by condensation of monomeric aromatic phenyl esters of aromatic dicarboxylic acids and an aromatic diamine in...
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3900448 |
Copolyamides which contain quinazolinedione structures
This invention relates to high molecular weight aromatic copolyamides which contain quinazolindione structures. They can be obtained by copolycondensation of quinazolinedione diamines with mixtures...
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3897402 |
High temperature polyimides from 2,3-diacylsuccinic acid diester with diamines
Polyimides which are stable at temperatures up to about 450° C. to 500° C. and which are useful for high temperature applications are prepared by reacting 2,3-diacylsuccinic diesters with...
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3896083 |
Heterocyclic polymers from triaminopyradine compounds
Thermally stable polymers are obtained by cyclodehydration of the precyclized prepolymers which are produced by reaction of acid derivatives such as bis(acid halides), mono(acid halide)anhydrides...
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3876586 |
Production of a polyacyloxalamidrazone
Production of polyacyloxalamidrazones, especially a very high molecular weight polyterephthaloyloxalamidrazone having recurring units of the formula ##SPC1## By a polycondensation of oxalic acid...
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3876583 |
Novel dicarboxylic acids containing diketopiperazine groups and polyesters prepared therefrom
Dicarboxylic acids having the formula ##SPC1## Wherein R 1 represents a phenylene or alkylene radical and R 2 represents a divalent organic radical, are prepared by reacting a tricarboxylic acid...
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3876617 |
Fluorine-containing elastomeric polyamides and copolyamides and process for their preparation
A new class of elastomeric polymers comprising in the macromolecular chain polyamide groups. The polymers can be cross-linked to form elastomers possessing excellent mechanical properties, high...
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3870685 |
Catalytic method for producing aromatic polyamides
High molecular weight wholly aromatic linear polyamides of film and fiber-forming grade are prepared by direct condensation of monomeric aromatic dicarboxylic acids and aromatic diamines in about a...
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3869430 |
High modulus, high tenacity poly(p-phenylene terephthalamide) fiber
High strength, high modulus fibers having a density of at least 1.4o g./cm. 3 and consisting essentially of poly(p-phenylene terephthalamide) of inherent viscosity of at least 4.0 are provided....
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3867478 |
POLYESTER COMPOSITION
Polyester fibers having excellent and uniform dyeability with acid dyes and good whiteness, and good fastness to light and washing on dyed article, and good other fiber properties can be obtained...
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