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5084547 |
Thermotropic, fully aromatic polycondensates, a process for their preparation and their use for the production of moulded articles, fibres, filaments, sheet products and films
The thermotropic, fully aromatic polycondensates according to the invention, which contain compounds capable of complex formation, are distinguished by improved resistance to hydrolysis and may be...
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5084549 |
Liquid crystalline compounds, their production and their use as modifiers for polycarbonates, polyester carbonate and polyesters
The present invention relates to aromatic compounds corresponding to formula (I) ##STR1## to their production and to their use as modifiers for thermoplastic aromatic polycarbonates and/or...
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5082920 |
Thermosetting bis(isoimide) resin compositions
Improvements in the thermal stability of bis(isoimide) resins are achieved by the addition of small amounts of trihydroxyaromatic or polyhydroxyaromatic compounds to the partially polymerized...
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5082919 |
Crosslinked thermotropic liquid crystalling polyarylate
A toner composition comprised of a crosslinked thermotropic liquid crystalline polymer, a branched liquid crystalline polymer, or mixtures thereof.
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5081205 |
Preparation of cross-linked polycarbonate with cross-linker polycarbonate resin
A polycarbonate resin, containing in the polymer chain at least one divalent moiety of the formula: ##STR1## wherein E is selected from the group consisting of alkylene containing from 1 to 15...
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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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5079335 |
Process for preparing a color-improved thermoplastic polyarylate polymer
Described herein is an improved process for preparing an ester derivative of a dihydric phenol by reacting the dihydric phenol with an acid anhydride wherein the improvement comprises carrying out...
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5077377 |
Process for preparing melt-processible aromatic polyamides with alkali metal fluoride catalyst
A process is provided for the production of a novel melt-processible aromatic polyamide having a Tg >150° C.
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5071997 |
Polyimides comprising substituted benzidines
A new class of polyimides and copolyimides made from substituted benzidines and aromatic dianhydrides and other aromatic diamines. The polyimides obtained with said diamines are distinguished by...
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5071942 |
Melt processable thermotropic aromatic copolyesters
The invention relates to a class of copolymers capable of forming an optically anisotropic melt comprising recurring structural units (a) independently each occurrence selected from the group...
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5070177 |
Ultraviolet radiation resistant polyphthalatecarbonate resin
An aromatic polyphthalatecarbonate resin having a small percentage of phthalate units therein exhibits improved resistance to hazing and yellowing upon exposure to ultraviolet radiation. The...
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5068308 |
Continuous preparation of aromatic polycondensates
Aromatic polycondensates are prepared in a continuous process from a) aromatic hydroxy-, thio- and/or amino-carboxylic acids, b) aromatic dihydroxy-, dithio-, diamino- and/or hydroxy-amino...
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5068131 |
Method for production of electronic coatings
In humid atmospheres (e.g., 40% relative humidity or above) solutions of 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride/2,2-bis[4-(aminophenoxy)phenyl]hexafluoropropane
polyimides tend...
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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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5066765 |
Poly(azomethine-ester) having film-forming ability, and heat resistance pre and regulated monomer sequences in the polymer backbone
This invention relates to a poly(azomethine-ester) having a repeating structural unit of the following formula [1] ##STR1## wherein Ar 1 and Ar 2 , which may be the same or different, are selected...
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5066767 |
Wholly aromatic polyesters comprising isophthalic acid, terephthalic acid, p-hydroxybenzoic acid, hydroquinone and an arylene diol
Wholly aromatic polyesters based on isophthalic acid, terephthalic acid, p-hydroxybenzoic acid, hydroquinone and an arylene diol, e.g. 4,4'-biphenol are described. The materials displayed are...
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5064518 |
Method for the selective alpha halogenation of alkylaromatic compounds
Inorganic and organic hypohalites are used to obtain good selectivity to alpha halogenation of alkyl aromatic compounds. Alkali and alkaline earth hypohalites must be used in conjunction with a...
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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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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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5055546 |
Process for producing aromatic polyesters
An aromatic polyester superior in heat resistance and melt-moldability is obtained by carrying out the polycondensation reaction with Component A consisting of at least one compound having the...
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5053477 |
Process for the production of aromatic polyether ketones
The present invention relates to a process for the production of high molecular weight crystalline aromatic polyether ketones from an aromatic dihydroxy compound and an aromatic dihalogeno compound...
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5051490 |
Thermoplastic polyarylate compositions having improved oxygen barrier properties
Aromatic thermoplastic polyarylates containing structural units derived from a bisphenol of cyclohexanone, preferably 1,1-bis(4-hydroxy-3-methylphenyl)cyclohexane, and an aromatic dicarboxylic acid...
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5051520 |
9,9-bis(perfluroralkyl)xanthene, 9-aryl-9-perfluroralkylxanthene
Disclosed are rigid fluorinated monomers, their preparation, and polymers derived therefrom based on two novel tricyclic xanthene core systems, 9,9-bis(perfluoroalkyl)xanthene (I) and...
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5049643 |
Wholly aromatic polyester from mixture of naphthalene dicarboxylic acid
A wholly aromatic polyester is composed of naphthalene dicarboxylic acid units comprising 5 to 95 mole % of the unit having the formula (1) and 95 to 5 mole % of the unit having the formula (2) and...
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5049295 |
Aromatic polyester, aromatic polyester amide, filaments thereof and compositions thereof each containing an inorganic filler or magnetic powder
Provided herein are an aromatic polyester having superior physical properties which is composed of the following units ##STR1## an aromatic polyester amide formed by introducing a prescribed amount...
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5049340 |
Process for making continuous films of ordered poly(ether ketone ketones)
A process for extruding a smooth and uniform film or sheet of an ordered poly(ether ketone ketone) having a thickness of about 2.5 to 250 micrometers, wherein the molten extrudate is quenched on a...
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5049649 |
Colorless films formed from fluorinated polyimides
A colorless, optically clear film consisting essentially of a polyimide of the formula: ##STR1## wherein R is ##STR2## is disclosed. The composition forming the film has a weight average molecular...
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5045627 |
Melt-processable copolyester
A melt-processable copolyester consisting essentially of: a structural unit (I) of formula (1-1) ##STR1## and formula (1-2) ##STR2## wherein the amount of the species of formula (1-2) is 5 to 95...
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5045610 |
Blend of copolyestercarbonate polymer derived from diaryl dicarboxylic acid
This invention relates to copolyestercarbonate polymers which are prepared with diaryl dicarboxylic acid compounds, particularly biphenyldicarboxylic acid compounds. Such copolyestercarbonate...
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5045626 |
Aromatic copolyester
Aromatic copolyesters comprise 10 to 90 mol % of the repeating unit (I) and 90 to 10 mol % of the repeating unit (II): ##STR1## wherein Y 1 and Y 2 may be the same or different and are, for...
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5043419 |
Process for preparing a polyimide and a composite material containing the same
This invention relates to a method for preparing a polyimide having good heat-stability and excellent flowability in a molten state. The polymide is prepared by reacting aromatic diamines such as...
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5043413 |
Low birefringence polyarylate from polyarylene dicarboxylic acid and polyarylene diphenol
An organic polyarylate containing a repeating unit represented by the formula; ##STR1## wherein X is at least one member selected from the group consisting of --O--, --S--, --SO 2 --, --CO--,...
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5041521 |
Polyester-carbonate based on 1,1-bis-(4-hydroxyphenyl)-alkylcycloalkanes
Polyesters and polyester-carbonates based on dihydroxydiphenylcycloalkanes corresponding to the following general formula: ##STR1## wherein R 1 , R 2 , R 3 and R 4 independently represent...
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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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5039780 |
Copolyester having gas-barrier property
A copolyester having an intrinsic viscosity, measured in o-chlorophenol at 25° C., of 0.3 to 1.5 dl/g and being derived from dicarboxylic acid units composed of 95 to 60 mole % of isophthalic acid...
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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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5037939 |
Thermotropic, fully aromatic polyesters prepared by polycondensation of aromatic diphenols and aromatic carboxylic acids
Thermotropic, fully aromatic polyesters which have been prepared by polycondensation of p-hydroxybenzoic acid, hydroquinone, 4,4-dihydroxydiphenyl, terephthalic acid and isophthalic acid and which...
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5037940 |
Wholly aromatic copolyester
A wholly aromatic copolyester, comprising; the structural units I, II, and III represented by the following formulas, ##STR1## wherein in the structural unit I, the two carbonyl groups are present...
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5037938 |
Thermotropic copolymers of 4,4'-biphenyldicarboxylic acid
The invention relates to a class of polyesters and copolyesters which display optical anisotropy in the molten state and to the shaped articles, fibers and films obtained from the optically...
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5034502 |
Process for producing a polyarylate
A process for producing a polyarylate comprising the step of reacting (a) an aromatic dicarboxylic acid, (b) a bisphenol diacetate and (c) an aliphatic carboxylic acid anhydride of an aromatic...
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5032669 |
Liquid crystalline polyesters formed by reaction of bis(hydroxyalkoxy) biphenyls with terephthaloyl chloride
Novel liquid crystal polyesters can be formed by reaction of bis(hydroxyalkoxy)biphenyls (including the novel bis(2-hydroxybutoxy)biphenyl) with terephthaloyl chloride.
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5032667 |
Amide and/or imide containing polymers and monomers for the preparation thereof
Described herein are amide and/or imide containing polymers based on novel monomers that contain isoalkylidene bridges. These polymers have excellent toughness combined with high temperature...
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5030705 |
Copolymerized polyester from phenylene di(oxyaceteic acid) and isophthalic acid
Disclosed herein are a coppolymerized polyester produced by copolymerizing a dicarboxylic acid component (A) comprising (a) 10 to 90 mol % of isophthalic acid or an ester forming derivative...
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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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5030516 |
Coated substrates having an ultrathin, single-layer or multilayer coating, a process for their production and polyesters as intermediate products for the coated substrates
Coated substrates having an ultrathin, single-layer or multilayer coating of organic polymer material have been found, in which coated substrates the polymer used is a polyester of the structure...
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5026822 |
High molecular weight polyimide, method of making same and articles formed therefrom
A novel composition consisting essentially of a polyimide of the formula: ##STR1## wherein R is: ##STR2## is disclosed and claimed. The composition has a weight average molecular weight, M w of at...
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5025081 |
Preparation of polyestercarbonate from aliphatic dicarboxylic acid
A process for preparing a copolyestercarbonate which comprises reacting interfacially a dihydric phenol, a carbonate precursor, and a saturated aliphatic alpha omega dicarboxylic acid having from 9...
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5025065 |
Fire-retardant polycarbonates and polyesters
Fire-retardant polycarbonates, polyester carbonates and polyesters based on dihydroxydiphenyl cycloalkanes ##STR1## in which R 1 and R 2 independently of one another represent hydrogen, halogen,...
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5025082 |
Aromatic polyester, aromatic polyester-amide and processes for producing the same
The aromatic polyester and aromatic polyester-amide of the present invention have an excellent heat resistance (soldering resistance) and are excellent in fluidity, and therefore, excellent in...
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5023314 |
Novel polyarylate compositions having improved properties
Thermoplastic polyarylate compositions suitable for molding are formed from isophthalic acid, terephthalic acid or mixtures thereof, a bisphenolic compound such as bisphenol A and from about 5 to...
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