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3864310 |
HIGH PERFORMANCE HETEROCYCLIC POLYMER POLYMERIZATION VIA MOLTEN LEWIS ACID EUTECTICS
An improved process is provided for the synthesis of high performance heterocyclic polymers wherein the polymerization is conducted in the presence of a molten Lewis Acid eutectic selected for its...
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3862092 |
POLYAMIDE-IMIDE COMPOSITIONS
This invention relates to new polyamide-imide compositions having good hydrolytic stability and formed by reacting maleic anhydride with an intermediate diamine formed by reaction of trimellitic...
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3856714 |
POLYVIOLOGENS
Novel polyviologen compounds useful in variable density light-filtering devices are provided which have repeating units (in oxidized dicationic form) represented by the formula: Wherein R 1 is...
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3856742 |
PROCESS FOR IMPROVING THE ANTI-FRICTION PROPERTIES OF POLYMERIC SUBSTANCES
Process for improving the anti-friction properties of polymeric substances by adding silica powders to basically reacting starting monomers and condensing them into the reaction mixture.
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3853823 |
PREPARATION OF AMINOBENZENESULFONATE-MODIFIED POLYAMIDES
Polycarbonamide compositions having improved acid dye-resistance and basic dyeability properties wherein said polycarbonamides contain, as an integral part of the polymer chain, recurring amide...
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3849074 |
APPARATUS FOR MIXING QUICKLY REACTIVE MATERIALS
A novel apparatus is provided for mixing quickly reactive components in a chamber and rapidly discharging the reaction mixture from the chamber while avoiding build up of material along the walls...
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3846381 |
IMPROVED PROCESS FOR CONTINUOUSLY PRODUCING POLYHEXAMETHYLENE ADIPAMIDE BY CARRYING OUT WATER REMOVAL STEP IN A FORMIC ACID VAPOR CONTAINING ATMOSPHERE
An improvement in the process of continuously preparing polyamides by polymerizing a polyamide-forming composition containing adipic acid and passing the molten polyamide so formed to a vessel...
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3843633 |
DIVINYL-DIPHENYL COMPOUNDS
New sulphonated divinyl-diphenyl compounds of the formula ##SPC1## Wherein R represents a phenyl, naphthyl or diphenylyl radical which may be substituted by non-chromophoric groups Y represents...
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3843611 |
COPOLYAMIDE FROM TEREPHTHALIC ACID, DODECANEDIOIC ACID AND DODECANE DIAMINE
An improved copolyamide is derived from terephthalic acid, at least one straight-chain alkanedioic acid having from 8 to 14 carbon atoms, the terephthalic acid constituting from 50 to about 90 mole...
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3843609 |
TEREPHTHALAMIDE POLY BIS(PROPOXY)ALKYLENE
A polyamide consisting of a substantial homopolymer of poly-bis(propoxy) alkylene terephthalamide having the recurring structural unit of the formula ##SPC1## , wherein n is 3 or 4 has an improved...
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3839298 |
POLYAMIDES CONTAINING HYDANTOIN OR DIHYDROURACIL GROUPS
Polyamides containing hydantoin or dihydrouracil groups are obtained by polycondensing aliphatic-1-cycloaliphatic or aromatic dicarboxylic acids or derivatives of such dicarboxylic acids, in known...
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3835207 |
METHOD FOR FORMING REVERSE OSMOSIS MEMBRANES COMPOSED OF POLYAMIC ACID SALTS
A polymeric membrane is prepared by reacting a suitable derivative of a tri or tetracarboxylic acid with a diamine to form a polyamic acid, forming a film from the polyamic acid, imidizing the...
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3819573 |
POLYMER STABILIZERS PREPARED FROM LACTAMS OR LACTONES AND PHENOLIC COMPOUNDS
Stabilisers for polymers derived at least in part from phenolic monomers are made by polymerisation of: Either lactones, lactams, or reactive amine compounds, and optionally dibasic acids also, or...
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3816369 |
PROCESS FOR THE PREPARATION OF POLYAMIDES WITH ALKALI METAL DIHYDROGEN ORTHOPHOSPHATE AS CATALYST
Production of fiber forming polyamides from aromatic diamines and dicarboxylic acids by a melt poly condensation in the presence of at least one alkali metal dihydrogen orthophosphate as catalyst.
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3779859 |
CRIMPABLE COPOLYAMIDE FILAMENTS
Filaments which develop crimp when relaxed, of a copolymer composition comprising 6-12 nylon polymer units and N-substituted 6-12 nylon polymer units wherein the N-substituent is an alkyl group of...
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3779853 |
CRIMPABLE BICOMPONENT FILAMENT
Improved bicomponent filaments for use in stretch hosiery are composed of a poly(hexamethylenedodecanedioamide) component and an N-alkyl substituted poly(hexamethylenedodecanedioamide) component....
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3723396 |
CATALYTIC PRODUCTION OF POLYAMIDES FROM AROMATIC DIAMINES
A method of producing a polyamide which is of sufficiently high molecular weight to be used in moulding applications or for film or fiber formation from an aromatic diamine, by a high temperature...
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3714131 |
POLYAMIDEIMIDES
New and useful polyamideimides and their precursor polyamic acids are provided. The polyamic acid is prepared by reacting aliphatic diacid, tricarboxylic acid anhydride and polyamine material and...
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3705134 |
POLYAMIDE CONTAINING ORGANO METALLIC COMPOUND
Synthetic fiber and film forming polyamides containing organic compounds of metals of groups IV or V of the Periodic Table. The pressure of such compounds results in an increase in the rate of...
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3684775 |
CHAIN TERMINATED POLYHEXAMETHYLENE ADIPAMIDE
Filaments, having high tenacity, high initial modulus and low elongation-at-break, of poly(hexamethylene adipamide) having the recurring structural unit ##SPC1## Wherein the polymer chains are...
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3678015 |
PROCESS FOR MAKING POLYIMIDE PREPOLYMER WITH MIXTURE OF PHENOLIC AND HYDROCARBON SOLVENTS
A method is provided for making a curable polymeric reaction product of an organic diamine and an aliphatically unsaturated dicarbonyl compound such as an organic anhydride or organic dicarboxylic...
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3676406 |
POLYAMIDE OBTAINED BY REACTION OF A β, β-BIS(ALKYLAMINO) DIETHYL SULFONE AND A DICARBOXYLIC ACID CHLORIDE
Polyamides obtained by reacting a dibasic acid chloride and a β,β'-bis(alkylamino) diethyl sulfone. The polyamides are characterized by the repeating unit or methyl. wherein Z is phenylene or...
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3674744 |
POLYCONDENSATION IN POLY(TETRAFLUORETHYLENE) REACTOR
A process for the preparation of a high molecular weight polymer by a condensation process of a liquid reaction mixture wherein at least one volatile by-product is eliminated, characterized in that...
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3673162 |
COPOLYAMIDES FROM BIS(AMINOPHENYL)SULFONE
The hydrolytic stability (and especially the resistance to immersion in boiling water) of polyamides of bis(amino-phenyl)sulphones (or mixtures thereof with up to 20 mole percent of at least one...
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3669938 |
REMOVAL OF VOLATILES FROM POLYAMIDES
An improved method for facilitating removal of volatile materials from polyamides to be used in molding operations, without effecting the polyamide's relative viscosity or impairing its physical...
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3669941 |
POLYTRIAZAPENTADIENE POLYMERS
This invention relates to triazapentadiene polymers having at least one triazapentadiene unit of the formula: wherein each X is selected from chlorine and fluorine, each Y is selected from halogen...
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3627737 |
FILAMENTS WET-SPUN FROM VISCOSITY-STABILIZED AROMATIC POLYAMIDES
Aromatic polyamides are advantageously viscosity-stabilized by the presence during polymerization of a stabilizing amount of a compound of ##SPC1## Wherein R is hydrogen, a lower alkyl radical or...
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3625922 |
METHOD FOR PREVENTING ELECTRIFICATION OF SYNTHETIC HIGH POLYAMIDES
Synthetic high polymers, such as polyamides, polyolefins, polystyrenes, polyvinyl chloride, polyvinylidene chloride, copolymers thereof and polymer blends thereof can be prevented from...
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3624245 |
HEAT STABILIZED ANTISTATIC POLYAMIDES
Tensile strength loss on heating is reduced, in polycarbonamides containing between 0.1 and 20.0 weight percent polyalkoxylated triglyceride of a fatty acid containing from 10 to 30 carbon atoms,...
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3622544 |
POLYTEREPHTHALAMIDES OF N-ARYL-SUBSTITUTED SHORT CHAIN DIAMINES
Linear terephthalamide polymers having high tensile modulus composed of recurring units having the structural formula: ##SPC1## Wherein n is 2 or 3 and R is aryl.
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3551389 |
PROCESS FOR THE POLYMERIZATION OF AROMATIC POLYBENZIMIDAZOLES
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3551548 |
METHOD FOR SPINNING POLYAMIDE YARN OF INCREASED RELATIVE VISCOSITY
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3551388 |
POLYAMIDE FIBERS OF IMPROVED DYEABILITY PREPARED IN THE PRESENCE OF ETHYLENE OR PROPYLENE CARBONATE
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3549516 |
PROCESS FOR PRODUCING POLYHEXAMETHYLENE SUBERAMIDE
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3549601 |
POLYAMIDE MOLDING RESIN OBTAINED BY POLYMERIZING POLYAMIDE PRECURSORS IN THE PRESENCE OF A CRITICAL PROPORTION OF END CAPPING AGENT: BRANCHING AGENT
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3544527 |
NOVEL MOISTURE RESISTANT POLYAMIDES FROM A DIAMINE HAVING AT LEAST ONE PIPERIDYL GROUP
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3544528 |
PRODUCTION OF A POLYACYLOXAMIDRAZONE
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3542743 |
BASIC DYEABLE ACID DYE RESISTIVE POLYAMIDES CONTAINING TERMINAL ARYL DISULFONATED GROUPS
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3536804 |
PROCESS FOR PRODUCING POLYXYLENEADIPAMIDE FIBERS
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3534001 |
HIGH MOLECULAR WEIGHT FLEXIBLE POLYUREAS
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3534002 |
POLYAMIDES FROM DICARBOXY DERIVATIVES OF HYDRONAPHTHALENES AND PROCESSES FOR THEIR MANUFACTURE
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3529929 |
PROCESS FOR PRODUCTION OF FINELY DIVIDED CALCIUM FLUORIDE
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3522209 |
INCORPORATION OF WATER INSOLUBLE ADDITIVES INTO AQUEOUS POLYMER SOLUTION
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3519699 |
POLYAMIDE BLENDS CONTAINING DICARBOXY DIPHENYL SULFONE GROUPS AND PIPENIDYL GROUPS
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3518234 |
NOVEL AROMATIC POLYAMIDE IMINES,NOVEL N-ARYL SUBSTITUTED POLYBENZIMIDAZOLES DERIVED THEREFROM AND PROCESSES FOR PREPARATION THEREOF
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3516972 |
PROCESS FOR THE PREPARATION OF POLYAMIDES IN FINELY DIVIDED FORM
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3511815 |
DEEP DYEING POLYCARBONAMIDE FILAMENT
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3511819 |
THERMALLY DURABLE AROMATIC COPOLYAMIDES
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3507837 |
ACIDIC COMPOUNDS USED TO MODIFY CURING OF POLYMERS WITH MULTIAZIRIDINO COMPOUNDS
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3505298 |
SYNTHETIC COPOLYAMIDES CONTAINING PENDANT FLUORENE GROUPS
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