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5097001 |
Hydroquinone poly(iso-terephthalates) containing residues of p-hydroxybenzoic acid
A high modulus, high strength melt processable copolyester consisting essentially of recurring units (I), (II), (III) and (IV): ##STR1## wherein said copolyester has a melting point in the range of...
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5081229 |
Polyimide having excellent thermal dimensional stability
The present invention provides a copolyimide characterized in that the copolyimide contains units represented by formulas (I) and (II) ##STR1## (wherein R 0 represents an aromatic tetracarboxylic...
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5079289 |
High modulus, high strength melt-processible polyester of hydroquinone poly (iso-terephthalates) containing residues of a p-hydroxybenzoic acid
This invention pertains to novel copolyesters consisting essentially of units (I), (II), (III), and (V). ##STR1## and blends of these polymers and articles made from both. Units (I), (II), (III),...
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5075416 |
Novel process
A process for the preparation of an aromatic hydrocarbon resin modified with aromatic carboxylic acids comprising suspending methane sulfonic acid and at least one aromatic carboxylic acid in an...
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5070181 |
Polyimide film
Disclosed is a film of polyimide having repeating units of formula (1) and a birefringence (Δn) of at least 0.13: ##STR1## wherein R 1 is an aromatic group having a valency of 4, at carbon atoms...
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5070176 |
Melt phase polyarylate process
Disclosed is a process for preparation of a polyarylate having a degree of polymerization of at least 50 by polymerizing an admixture comprised of 4-dialkylaminopyridine, an acid anhydride,...
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5068307 |
Polyamideimides containing 3,4'-diamino-diphenylether as diamine component and process for preparing the same
A polyamideimide having an inherent viscosity of above 0.48 which comprises a unit of the following formula (II) ##STR1## and a unit of the following formula (IV) ##STR2## as main units forming the...
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5066766 |
Process for the preparation of poly(ester-carbonates)
Disclosed is a process for the preparation of poly(ester-carbonates) wherein (1) an aromatic diol, (2) methyl phenyl carbonate and (3) an alkyl carboxylate ester component selected from an aromatic...
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5064930 |
Solid phase polyarylate process
A process comprising (A) preparing a solid polyarylate prepolymer having an inherent viscosity of at least about 0.1 by heating at a temperature in the range of 140° C. to 300° C. in the melt...
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5061783 |
Processing for maximizing the level of crystallinity in linear aromatic polyimides
The process of the present invention includes first treating a polyamide-acid (such as LARC-TPI polyamide-acid) in an amide-containing solvent (such as N-methylpyrrolidone) with an aprotic organic...
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5061781 |
Polyimides from diaminobenzotrifluorides
Polymides are made by imidization of the product of reaction of dianhydrides with diaminobenzotrifluoride and bis(trifluoromethyl) oxydianilines. In preferred embodiments the polyimides are end...
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5055549 |
Process for preparing photosensitive heat-resistant polymer
The present invention is connected with a process for preparing a novel photosensitive polyimide precursor having excellent shelf stability and high sensitivity and containing less impurities. The...
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5039773 |
Toner and developer compositions with thermotropic liquid crystalline polymers
Thermotropic liquid crystalline polymers represented by the formulas as illustrated in FIGS. 1 and 2 wherein m, n, and o represent the number of monomer segments present; and x, y, and z are...
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5037220 |
Printing ribbon comprising polycondensates
Films from aromatic polyesters and from aromatic polyestercarbonates are excellently suitable for preparing printing ribbons, in particular for thermal and electrothermal recording processes.
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5030703 |
Liquid crystal polycondensates with improved heat stability, a process for their preparation and their use for the production of shaped articles, films, fibres and filaments
The liquid crystal polycondensates according to the invention based on aromatic hydroxycarboxylic acids, if appropriate aromatic aminocarboxylic acids, diphenols, if appropriate aminophenols,...
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5025089 |
Copolyimides derived from 2,2-bis (amino phenyl) hexafluoropropane
Copolyimides derived from the reaction product of 3,3'-6 F diamine or 4,4'-6 F diamine, at least one other diamine, and pyromellitic dianhydride can be rendered solvent soluble while at the same...
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5021541 |
Polycarbonate resin from bis(hydroxy benzoyl oxy-tetra oxa spiro) cpd.
A polycarbonate resin comprising either a structural unit derived from a spiro ring-containing dihydric phenol, or such a structural unit and a structural unit derived from a dihydric phenol, and a...
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5015720 |
Method for preparing polycarbonates containing aliphatic ester groups
Polycarbonates containing aliphatic dicarboxylic ester groups, and having glass transition temperatures and processing temperatures lower than the corresponding homopolycarbonates are prepared via...
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5006628 |
Melt phase polyarylate process
A process for preparing a polyarylate by heating in the melt phase in the presence of a 4-dialkylaminopyridine, an acid anhydride which is in the range of stoichiometric amount to 25% molar excess,...
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5006632 |
Process for preparing heat resisting hydrobenzoic acid series polyesters with high degree of polymerization
This invention provides a process for preparing hydroxybenzoic acid polyer resins with a high degree of heat resistance and a high degree of polymerization, and is characterized in that: with the...
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5004796 |
Preparation of poly(arylate) using a non-solvent
A polyarylate is formed by reacting a mixture of a diester of a dihydric phenol, at least one aromatic dicarboxylic acid and an inert diluent comprising a poly(fluorinated alkylene oxide)....
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4994546 |
Process for preparing bisphenol polyarylates
Process for preparing polyarylates comprising the steps of (a) prepolymerizing a diester of Bisphenol-A with at least one aromatic dicarboxylic acid to form a prepolymer having a melting point of...
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4992526 |
Preparation of polyarylate polymers of hydroxyaryl-substituted 1,6-diaza [4.] spirodilactams
High molecular weight polyarylate polymers comprise alternating moieties derived from an aromatic dicarboxylic acid halide, with moieties derived from a hydroxyaryl-substituted 1,6-diaza [4.4]...
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4983706 |
Interfacial process comprising reacting a dihydric phenol, a carbonate precursor and an aliphatic alpha omega dicarboxylic salt
A process which comprises reacting interfacially a dihydric phenol, a carbonate precursor and a prior prepared salt of an aliphatic alpha omega dicarboxylic acid having from 8 to about 20 carbon...
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4980451 |
Catalytic production of aromatic polyamides from high purity monomers
Aromatic polyamides having an improved resistance against thermal oxidation, are produced by utilizing monomers having a very high degree of purity, at least 99.90% by weight, preferably, at least...
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4973652 |
Process for the production of aromatic polycarbonates, aromatic polyester carbonates and aromatic polyesters with p containing catalyst and mixture of hydrocarbons
The invention relates to a process for the production of aromatic polycarbonates, aromatic polyester carbonates and aromatic polyesters by the known two-phase interfacial method which is...
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4963643 |
Crystalline polyarylnitrile ether polymer
Described herein are novel crystalline polyarylnitrile polymers which have excellent mechanical and thermal properties. Also, described is a process for producing such polyarylnitrile polymers.
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4963645 |
Terminal-modified imide oligomer and solution composition of the same
A terminal-modified imide oligomer having an unsaturated group as a terminal group and an imide bond inside of the oligomer which is produced by reacting 2,3,3',4'-or...
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4963647 |
Polyamide-imide polymers having 12-F fluorine-containing linking groups
The present invention provides novel heat stable polyamide-imide polymers having excellent flow properties which render them more readily processible into fibers, films, sheets and other molded...
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4960859 |
Rigid rod aromatic benzimidazole/thiazole heterocyclic copolymer
There are provided copolymers having repeating units of the formula ##STR1## wherein X is --S--, --O-- or --NH--; and wherein y ranges from about 0.02 to 0.20 and z is 1.0-y.
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4960854 |
Rigid rod aromatic benzthiazole/oxazole heterocyclic polymer
There are provided aromatic heterocyclic polymers having repeating units of the formula ##STR1## wherein R 1 is --H or R 2 is ##STR2## R 3 is ##STR3## and R 4 is R 2 or ##STR4## and B is...
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4960853 |
Rigid rod aromatic benzoxazole/thiazole heterocyclic copolymers
There are provided copolymers having repeating units of the formula ##STR1## wherein R 1 is --H or ##STR2## R 2 is ##STR3## R 3 is ##STR4## and R 4 is R 2 or ##STR5## and B is ##STR6## wherein...
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4959449 |
Process for preparing low color polyarylates
Polyarylates formed by reacting the diester of a dihydric phenol such as bisphenol-A and at least one aromatic dicarboxylic acid in the presence of an esterification catalyst is provided with...
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4957996 |
Preparation of polyarylate of improved color with cobalt salt
Improved polyarylate color is achieved by dissolving in the polyarylate-forming reaction mixture a cobalt salt of an ester of a C 3 to C 20 aliphatic or iso-aliphatic hydrocarbon. The cobalt salt...
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4954611 |
Shaped articles from polyamide-imide polymers having fluorine containing linking groups
The present invention provides for shaped articles made from novel heat stable polyamide-imide polymers having excellent flow properties which render them more readily processible into fibers,...
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4954610 |
Polyamide-imide polymers having fluorine-containing linking groups
The present invention provides novel heat stable polyamide-imide polymers having excellent flow properties which render them more readily processible into fibers, films, sheets and other molded...
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4952663 |
Wholly aromatic polyesters with reduced char content
This invention relates to the preparation of wholly aromatic polyesters from monomers having a total ash content of no more than 50 ppm and a total potassium content of no more than 20 ppm. These...
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4946927 |
Preparation of aromatic polycarbonates, aromatic polyester carbonates and aromatic polyesters with organic phase comprising mixture of hydrocarbons
The present invention relates to a process for the preparation of aromatic polycarbonates, aromatic polyester carbonates and aromatic polyesters by the known two phase interface process, which is...
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4937311 |
Aromatic polyesters and polyester carbonates containing terminal aralkylphenyl groups, their production and use
The new aromatic thermoplastic polyesters and polyester carbonates based on diphenols, dicarboxylic acids, chain terminators and, optionally, branching agents, which are characterized in that the...
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4933424 |
Hydroxy terminated polycarbonate from hydroxy benzene alkanol
A method for the preparation of aromatic polycarbonate resins bearing terminal hydroxy groups comprises the interfacial polymerization of a dihydric phenol with a carbonyl halide in the presence of...
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4931532 |
Method of synthesis of thermoplastic aromatic benzoxazole polymers
There is provided an aromatic benzoxazole polymer having repeating units of the formula ##STR1## wherein Ar is ##STR2## wherein R is an alkyl group having 8 to 12 carbon atoms. The polymers of this...
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4927904 |
Method for preparing cyclic polyarylate oligomers
Cyclic polyarylate oligomer compositions are prepared by the reaction of an aromatic dicarboxylic acid halide, such as isophthaloyl chloride or terephthaloyl chloride, with a water-soluble salt of...
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4904752 |
Liquid crystal copolyester having blocked molecular chain terminal
A liquid crystal copolyester having a blocked molecular chain terminal comprising a copolyester which exhibits anisotropy in a molten state and has a functional group located at the terminal of its...
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4900805 |
Rigid rod aromatic benzthiazole heterocyclic polymer
There are provided heterocyclic polymers having repeating units of the formula ##STR1## wherein R 1 is --H or ##STR2## R 2 is ##STR3## R 3 is ##STR4## and R 4 is R 2 or ##STR5## and B is...
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4900804 |
Aromatic polyesters, polyesteramides, and compositions thereof
An aromatic polyester consisting of 40-70 mol % of unit I derived from p-hydroxybenzoic acid, 1-8 mol % of unit II derived from m-hydroxybenzoic acid or isophthalic acid, 6-36 mol % of units III...
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4900806 |
Rigid rod aromatic benthiazole heterocyclic copolymer
There are provided copolymers having repeating units of the formula ##STR1## wherein R 1 is --H or ##STR2## wherein X is --S--, --O-- or --NH--; and wherein Y ranges from about 0.02 to 0.20 and z...
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4895922 |
Low temperature synthesis of polyesteramides
This invention disclosed a process for the synthesis of polyesteramides. By utilizing the phosphorus containing catalyst systems of the present invention, such polyesteramides can be synthesized at...
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4892921 |
Pendant benzazole rigid-rod aromatic benzoxazole
Provided are novel para-ordered aromatic heterocyclic polymers having repeating groups of the following formula ##STR1## wherein Y is --O--, --S--, or --NH--, n is 1 or 2, and Q is ##STR2## wherein...
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4874835 |
Polyetherimides and precursors therefor from oxydiphtalic anhydride diester and a mixture of diamines
Polyetherimide precursor compositions are prepared by a reacting mixture of at least two diamines selected from the group consisting of o-phenylenediamine, m-phenylenediamine and 4-aminophenyl...
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4873310 |
Aromatic polyamides based on phenoxyterephthalic acid and process for preparing them
Aromatic polyamides based on phenoxyterephthalic acid and a process for preparing them. Polyamides and copolyamides based on phenoxyterephthalic acid are resistant to chemicals and can be processed...
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