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5734004 |
Process for the purification of carbonic acid diaryl ester
The present invention relates to a distillation process for the purification of carbonic acid diaryl esters.
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5719254 |
Discoloration-insusceptible polycarbonate composition
Disclosed is a polycarbonate composition comprising (a) an aromatic dihydroxy compound/carbonic diester transesterification polycarbonate having terminal hydroxyl groups in a proportion of at least...
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5717057 |
Method of manufacturing polycarbonate
A method for manufacturing polycarbonate in which an aromatic dihydroxy compound and a carbonic acid diester can be effectively subjected to melt polycondensation using a small amount of a...
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5717056 |
Method for preparing polycarbonate by solid state polymerization
Solid state polycarbonate formation comprises an initial step of converting a precursor polycarbonate to an enhanced crystallinity precursor polycarbonate and a second step of polymerizing said...
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5717055 |
Production method of polycarbonate resin pellets
A method of producing polycarbonate resin pellets containing very less residual organic solvent and low molecular weight volatile matters and having a high transparency by melt-kneading a...
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5714568 |
Methods of preparing polyesters from cycle organic carbonates in the presence alkali metal-containing catalysts
A process for preparing an esterification product is disclosed. The process comprises providing a polyfunctional organic acid or anhydride, a cyclic organic carbonate compound, and a catalyst...
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5712362 |
Process for the production of UV-stable polycarbonates
The invention relates to a process for the production of UV-stable polycarbonates, to the polycarbonates obtainable in accordance with the invention and to their use for the production of sheets,...
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5710238 |
Process for preparing branched polycarbonates by solid state polymerization
This invention involves a novel process for preparing branched polycarbonates employing a solid state polycondensation process; specifically, subjecting a linear crystallized oligomer derived from...
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5703196 |
Process for producing polycarbonate having terminal hydroxyl groups
A process for producing a polycarbonate having terminal hydroxyl groups obtained by reacting an aliphatic polyol with a carbonate monomer, characterized by comprising the first step of producing a...
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5698665 |
Polycarbonate processes with supercritical carbon dioxide
A process for the preparation of polycarbonates which comprises the reaction of a bisphenol, an arylcarbonate and a catalyst, which reaction is accomplished by heating said bisphenol, said...
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5698661 |
High molecular weight polyesterpolycarbonates and the use thereof for the preparation of bioerosible matrices
Polyesterpolycarbonates of formula (I) ##STR1## wherein a is an integer from 2 to 300; R 1 and R 2 , which can be the same or different, are each a polyester residue of formula (II) ##STR2## with...
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5696222 |
Process for the production of polycarbonate
A process for the production of a terminal-blocked aromatic polycarbonate by melt-polycondensing an aromatic dihydroxy compound and diphenylcarbonate, the process comprising adding a specific...
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5688896 |
Non-linear optically active polycarbonate
The invention pertains to a non-linear optically active (NLO) side chain polycarbonate and to NLO active waveguides containing said polycarbonate. Waveguides containing this NLO polycarbonate have...
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5684115 |
(Co)polycarbonate composition containing boric acid and a basic catalyst
A processes for producing a (co)polycarbonate having a low terminal hydroxyl group concentration and being excellent in heat resistance and hue, which comprises melt-polycondensing a dihydroxy...
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5684087 |
Process for producing thermoplastic granulated polymer material from polymer solutions
This invention relates to a process for producing granulated polymer materials from polymer solutions, in which organic solvent of the polymer solution is evaporated in a heat exchanger, optionally...
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5679759 |
Polycarbonate moulding materials with improved toughness
Thermoplastic moulding materials containing A. 15 to 80 parts by weight of a thermoplastic polycarbonate or polyester carbonate, and B. 4 to 40 parts by weight of a graft polymer of B.1 20...
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5670603 |
Polymers exhibiting nonlinear optical properties
This invention relates to polymers having non-linear optical properties which polymers include fluorene moieties having at least one electron accepting group and at least one electon donating group...
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5670605 |
Copolycarbonate, a copolycarbonate composition, and a method for their manufacture
A heat resistant copolycarbonate comprises a component of the formula: ##STR1## and a component selected from: ##STR2## R 1 and R 2 are same or different halogens or monovalent hydrocarbons, R 3...
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5670604 |
Preparation of a polycarbonate by melt-polycondensation of a dihydric phenol and a carbonic diester
A process for preparing a substantially chloride-ion-free, high-molecular-weight, colorless and transparent polycarbonate by melt-polycondensing a dihydric phenol with a carbonic diester, which...
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5668240 |
Energetic nitro polymer
Hydroxy-terminated poly(2,2-dinitropropyl)polynitroorthocarbonate prepolys of the formula ##STR1## which are prepared by reacting bis(2,2-dinitropropyl)dichloroformal with a diol of the formula...
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5668241 |
Energetic flouronitro polymer
Hydroxy-terminated poly(2-fluoro-2,2-dinitroethyl) polynitroorthocarbonate repolymers of the formula ##STR1## which are prepared by reacting bis(2-fluoro-2,2-dinitroethyl)dichloroformal with a diol...
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5663278 |
(Co)polycarbonate and process for producing the same
A processes for producing a (co)polycarbonate having a low terminal hydroxyl group concentration and being excellent in heat resistance and hue, which comprises melt-polycondensing a dihydroxy...
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5663277 |
Aromatic polycarbonate resin granule and process for the production thereof
An aromatic polycarbonate resin granule formed of an aggregate of fine powder particles, the granule having a specific surface area of 0.05 to 2.0 m 2 /g, a bulk density of 0.3 to 0.8 g/ml, and an...
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5663280 |
Carbonate polymer resins containing low volatility aromatic phosphate ester compounds
Disclosed is a carbonate polymer composition comprising (a) a carbonate polymer having a weight average molecular weight of from about 20,000 to about 40,000 and (b) from greater than about 0.1 to...
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5658995 |
Copolymers of tyrosine-based polycarbonate and poly(alkylene oxide)
Random block copolymers having the formula: ##STR1## wherein R 1 is --CHCH-- or (--CH 2 --) j , in which j is zero or an integer from one to eight; R 2 is selected from hydrogen, straight and...
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5652324 |
Process for the production of thermoplastic polycarbonate
The invention relates to a transesterification process for the production of thermoplastic, solventless oligo-/polycarbonates in which aromatic diphenols and carbonic acid diaryl esters are...
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5652312 |
Redistribution of organic polyestercarbonate compositions
Polyestercarbonates, particularly those containing aliphatic dicarboxylic acid-derived structural units, are redistributed by heating in the presence of a carbonate redistribution catalyst, and,...
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5652275 |
Process for the chemical recycling of polycarbonates
The invention relates to a process for the chemical recycling of polycarbonates by catalyzed reaction with diaryl carbonates to oligocarbonates which are crystallized, purified and then...
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5652313 |
Two-stage process for the manufacture of thermoplastic polycarbonate
The present invention provides a two-stage melt process for the manufacture of thermoplastic, solvent-free, low-branched polycarbonates with low OH end-group contents with the use of ammonium or...
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5650480 |
Process for preparing polycarbonate
The present invention is directed to a process for preparing a polycarbonate in accordance with an ester exchange reaction of a dihydroxy compound (A) and a carbonic acid diester (B) by adjusting,...
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5650470 |
Polycarbonate redistribution using diethyldimethylammonium hydroxide as catalyst
Polycarbonate compositions are redistributed by melt equilibration using diethyldimethylammonium hydroxide as the redistribution catalyst. This catalyst affords an odorless polycarbonate product...
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5648437 |
Process for the manufacture of thermoplastic polycarbonate
The present invention provides a melt process for the manufacture of thermoplastic solvent-free polycarbonates with the use of a continuously operated tubular reactor for monophenol vaporization.
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5644017 |
Polycarbonate terminated by an ionic sulfonated aromatic moiety and preparation thereof
An aromatic polycarbonate is terminated by an ionic sulfonated aromatic moiety bonded to the polycarbonate by a carbonate or ester linkage. The aromatic polycarbonate can be terminated by reacting...
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5637643 |
Polycarbonate resin composition and exterior automotive trim using same
The present invention intends to provide a polycarbonate resin composition which can inhibit the deterioration of the resin, can stably afford molded articles having a high stiffness and a good...
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5633339 |
Use of tertiary aliphatic monocarboxylic acids as chain terminators for the preparation of polycarbonates and of polyester carbonates
The present invention relates to the use of special monocarboxylic acids as chain terminators for the preparation of polycarbonates and of polyester carbonates, and to the polycarbonates and...
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5631344 |
Block copolymer of polyesters and polycarbonates and process for preparation thereof
The block copolymer of polyesters and polycarbonates comprises at least one of each of the constituting units of (I) and (II) having the general formulae: ##STR1## where the sign * indicates an...
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5629404 |
Impact resistant polymers based on bisphenol-A-polycarbonate
A high impact polymer comprising repeating monomer units of the formula: ##STR1## wherein R 2 and R 2 are substituents selected from the group consisting of hydrogen, an alkyl group, an aryl ring...
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5627255 |
Poly(arylester-carbonate)s and a process for the preparation of poly(arylester-carbonate)s
Novel poly(arylester-carbonate)s of the formula ##STR1## are disclosed, as well a process for preparing such poly(arylester-carbonate)s.
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5627256 |
Polycarbonates containing aryl phosphines
The present invention relates to thermoplastic aromatic polycarbonates having a content of special aryl phosphines, to their preparation, and to their use in the light engineering sector and in...
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5625027 |
Branched polycarbonate
A process for producing a branched polycarbonate which comprises using a branching agent containing 200 ppm or less of sulfur; a branched polycarbonate which is prepared by the interfacial method...
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RE35499 |
Elimination of monocarbonate from polycarbonate
A polycarbonate composition, and process for making same, wherein the monocarbonate and dicarbonate content is eliminated or limited to negligibly low levels by withholding introduction of chain...
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5621065 |
Polycarbonate diols, their preparation and use as starting products for polyurethane plastics
This invention relates to novel polycarbonates having hydroxyl end groups and an average molecular weight of 500 to 12,000, as determined by measuring the OH number, and being based on dimer diols...
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5618906 |
Process for the production of thermoplastic polycarbonates
A process is described for preparing solvent-free polycarbonate using phosphazene catalysts.
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5618890 |
Allylphenol-terminated polycarbonates grafted with maleic anhydride, their use for the production of blends with polyamide and the corresponding blends
The invention relates to polycarbonates (PC) terminated by allylphenols, preferably eugenol, and subsequently grafted with maleic anhydride (MA) in the melt, to their use as blending partners for...
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5614599 |
Stilbene-based polyester and polycarbonate compositions
Described is a polycarbonate, polyester, or polyestercarbonate composition prepared from a reaction mixture comprising at least one diol and at least one carbonate precursor or ester precursor,...
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5612398 |
Radiation-resistant polycarbonates
The present invention provides polycarbonates stabilized against γ-radiation and their use for the production of medical equipment.
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5610262 |
Process for producing polycarbonate
In a process for producing a polycarbonate by subjecting a dihydroxy compound and a diester of carbonic acid to melt polycondensation through transesterification, after a polycarbonate prepolymer...
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5608027 |
Complex stabilizer composition to improve the melt stability and color stability of polycarbonates
A composition comprising a phosphorus containing acid and an ester of a phosphorus containing acid useful for imparting improved physical and chemical properties to polymers containing polyesters,...
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5606007 |
Processes for preparing aromatic polycarbonates
According to the present invention, there is provided an improvement which comprises adding an acid compound and if necessary an epoxy compound to a reaction product resulting from melt...
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5606009 |
Copolymerized polycarbonates
The present invention provides copolymerized copolyester-carbonates having improved flow and formability, in addition to excellent mechanical properties, heat resistance, transparency, and water...
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