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5602201 |
Impact resistant resin composition
Resin composition comprising (A) 1-99 parts by weight of a copolymeric polycarbonate, in which there are structural units represented by the following formulas (Structure 1) and (Structure 2) and...
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5596067 |
Free fall polymerization process for the production of polycarbonates
A method for producing an aromatic polycarbonate comprises introducing to an introduction zone (having a perforated plate) a) a molten monomer mixture of an aromatic dihydroxy compound and a diaryl...
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5580951 |
Method for preparing aromatic bischloroformate compositions and polycarbonates
Bischloroformate oligomer compositions are prepared by passing phosgene into a heterogeneous aqueous-organic mixture containing at least one dihydroxyaromatic compound, with simultaneous...
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5576414 |
Process for generating a vacuum in production of polycarbonate
Process for generating a vacuum and separating the condensable components of the vapors of melt-phase polycondensation in the production of polycarbonate, where at least one or two vapor jets with...
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5556936 |
Aromatic polycarbonates having polyfunctional UV screening units, method for making and use
UV stabilized polycarbonates are provided having chemically combined polyhydric phenol benzotriazole carbonate units, such as...
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5532324 |
Copolymeric polycarbonates, a method for their preparation, and compositions thereof
A copolymeric polycarbonate containing repeating constituent units having formula [I] below and repeating constituent units having formula [II] below in a molar ratio of from 98:2 to 40:60....
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5527876 |
Process for the production of plastics containing amide groups
The invention relates to a process for the production of plastics containing amide groups with elimination of CO 2 by reaction of polyfunctional isocyanates, carboxylic acids and, optionally,...
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5525701 |
Method for the manufacture of aromatic polycarbonate
Aromatic polycarbonates manufactured by polycondensation of a dihydric compound and a carbonic acid diester using at least two reactors in series have improved color and low impurities content when...
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5519106 |
Process for the preparation of aromatic polycarbonate resins
A process for preparing an aromatic polycarbonate resin from an aromatic dihydroxy compound and a carbonate diester by transesterification in the presence of a transesterification catalyst...
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5516878 |
Process for the production of aromatic polycarbonate
A process for the production of an aromatic polycarbonate, which comprises polycondensing an aromatic dihydroxy compound and a diaryl carbonate in the presence, as a polycondensation catalyst, of...
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5510450 |
Method of producing copolymerized polycarbonates
The object of the present invention is to provide a method of producing copolymerized polycarbonates having improved flow and formability, in addition to excellent mechanical properties, heat...
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5508375 |
Process for the preparation of polycarbonates
The present invention relates to a process for the preparation of polycarbonates in which an oil-in-water emulsion is maintained throughout by employing special reaction conditions.
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5488094 |
Process for the preparation of polycarbonate
A process for preparing substantially chloride-ion-free, high-molecular-weight, colorless and transparent polycarbonate by melt-polycondensing a dihydric phenol with a carbonic diester, which is...
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5484875 |
Copolymeric polycarbonate production method
The present invention relates to a method for preparing copolymeric polycarbonates which comprises melt polycondensing a mixture of an aromatic dihydroxy compound containing an amount of 2-90 mol %...
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5480959 |
Substantially pure bisphenols and polymers comprising bisphenols
Bisphenols are prepared from cyclic monoterpene precursors and high glass transition temperature polymers are prepared from bisphenols. More particularly, substantially pure...
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5468836 |
Process for the preparation of polycarbonate
A polycarbonate which is not discolored and is substantially free from chlorine ions causative of discoloration, has a branching parameter G of 0.1 to 1.0 and, terminal hydroxyl groups of 20 mole %...
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5463012 |
Polycarbonates and the use thereof for the preparation of bioerosible matrices
Polycarbonates of formula (I) wherein a is an integer from 2 to 300; R 1 and R 2 are the same or different and are independently a polyester residue of formula (III) wherein x and y are integers...
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5455324 |
Aromatic polycarbonate resin of improved color
Disclosed herein is an aromatic polycarbonate resin containing benzophenone and benzoate ester derivatives which have a molecular weight less than 1,000, each in an amount of 100 ppm or less. Also...
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5455302 |
Thermoplastic resin compositions
A thermoplastic resin composition which contains 1-99 parts by weight of a polycarbonate resin and/or a copolyester carbonate resin, 99-1 parts by weight of a copolymer containing an aromatic vinyl...
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5444148 |
Improved transesterification process for the production of polycarbonates
An improvement to the transesterification process for the production of aromatic polycarbonates is disclosed. Into the melt which contains diphenols, carbonic acid diaryl esters and optionally...
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5428090 |
Polycarbonate polymer derived from dihydroxy compound having triphenylamine structure and process for producing the same
A polycarbonate derived from a novel dihydroxy compound having a triphenylamine structure, and a process for producing the polycarbonate are disclosed. The polycarbonate is obtained by reacting a...
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5418316 |
Guanidine-derived catalyts for preparing polycarbonates by transesterification
The present invention provides a transesterification process for the production of thermoplastic, solvent-free polycarbonates by the use of catalysts that are derived from guanidine.
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5416185 |
Process for efficient phosgene usage in the preparation of polycarbonates
A method for producing polycarbonates by the interfacial reaction of phosgene bisphenol in a two phase reaction medium of an aqueous hydroxide and an organic solvent is disclosed. In the reaction,...
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5412060 |
Process for the production of polycarbonate of constant viscosity
The invention relates to a process for the production of polycarbonates by the two-phase interfacial method in which deviations between measured and estimated variables are continuously minimized...
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5408027 |
Process for the production of aliphatic-aromatic polycarbonates
A process for producing an aliphatic-aromatic polycarbonate is disclosed. The process comprise (A) reacting in an anhydrous neutral solvent (i) an oligocarbonate of diphenol with (ii) an aliphatic...
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5405934 |
Process for producing (co)polycarbonate
A process for producing a (co)polycarbonate having excellent thermal resistance, hue and impact resistance and a high molecular weight, which comprises conducting a melt-polycondensation of a...
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5401826 |
Method for the preparation, of copolymeric polycarbonates
A copolymeric polycarbonate containing repeating constituent units having formula [I] below and repeating constituent units having formula [II] below in a molar ratio of from 98:2 to 40:60....
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5399659 |
Two-stage process for the production of thermoplastic polycarbonate
The invention relates to a two-stage process for the production of thermoplastic, solvent-free lightly branched polycarbonates in the melt using ammonium and/or phosphonium catalysts in the first...
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5391692 |
Method for making aromatic polycarbonates
A method is provided for making polycarbonate utilizing an effective amount of a phase transfer catalyst, such as tetrabutylammonium bromide as a condensation catalyst during the interfacial...
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5391690 |
Process for producing (co)polycarbonate and (co)polycarbonate composition
A process for producing a (co)polycarbonate or a (co)polyestercarbonate having a high molecular weight and excellent hue, heat stability and mechanical properties by reacting a dihydroxyl compound...
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5384337 |
Poromeric material having uniformly distributed electrets for maintaining an electrostatic charge
A poromeric material for maintaining an electrostatic charge is provided, the material including a matrix of fibers, a polymeric binder for binding the matrix, and electrets present substantially...
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5380814 |
Aromatic polycarbonate and process for production thereof
A process for producing an aromatic polycarbonate by reacting an aromatic dihydroxy compound, an alkali or alkaline earth metal base and a carbonyl halide compound comprises feeding a...
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5373083 |
Thermoplastic resin and method using heterocyclic amine catalyst
The present invention discloses thermoplastic resins and methods for producing said resins utilizing a single component heterocyclic amine catalyst system. More particularly, the invention...
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5373082 |
Process for the production of thermoplastic polycarbonates
A process for the production of polycarbonates by melt transesterification is disclosed. Accordingly, polycarbonate waste is dissolved in monophenols and at an elevated temperature and in the...
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5362841 |
Process for the preparation of high molecular weight halogenated polycarbonate
A process for preparing halogenated polycarbonate wherein the total amount of base the end pH of the aqueous phaser and the amount of coupling catalyst employed in the reaction are controlled to...
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5362840 |
Thermoplastic resin and method using volatile, self-quenching tertiaryamine catalyst
The present invention discloses thermoplastic resins and methods for producing said resins utilizing a single component tertiary amine catalyst system. More particularly, the invention discloses...
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5357028 |
Method of preparing polycarbonates and polyester carbonates
A catalytic method for preparing thermoplastic carbonate polymers is disclosed. In the method according to the interfacial polycondensation process or the homogeneous solution process, resins which...
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5340905 |
Process for the preparation of thermoplastic polycarbonates
A two step solvent-free process for the preparation of polycarbonates having a low degree of branching is disclosed. Accordingly, the process comprise (i) transesterifying in the melt, at...
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5324809 |
Melt catalytic preparation of copolymeric polycarbonate from hydroquinone
The present invention relates to a method of preparing a copolymeric polycarbonate which comprises melt-polycondensing a mixture of an aromatic dihydroxy compound comprising hydroquinone or...
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5321115 |
Process for preparing halogenated polycarbonate
A process for preparing a halogenated polycarbonate wherein phenolic-terminated, halogenated carbonate oligomers are prepared in the presence of a coupling catalyst, and are then condensed by...
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5319066 |
Method for making polycarbonates
A method is provided for making aromatic polycarbonates by the melt condensation of a diaryl carbonate and an aromatic bis hydroxy compound in the presence of a condensation catalyst, such as...
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5314985 |
Molten, catalytic process for the preparation of polycarbonates
The object of the present invention is to provide a process for the preparation of aromatic polycarbonates in the molten state using fluoride catalysts.
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5300624 |
Method for making flame retardant polycarbonate
A method is provided for making flame retardant polycarbonates by phosgenating a mixture of bisphenols having up to about 50 mole % of tetrahalobisphenols, such as tetrabromobisphenols. There is...
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5300623 |
Method for making polycarbonate substantially free of diaryl carbonate
A method is provided for making polycarbonate by phosgenating a mixture of bisphenol and phenolic chain-stopper under interfacial reaction conditions in the presence of a phase transfer catalyst. A...
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5288837 |
Preparation of polycarbonate with subsequent addition of chain terminator and base
A process for preparing polycarbonate wherein a chain terminator is added to the reaction mixture after substantial reaction of a carbonate precursor, a coupling catalyst is added to the reaction...
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5288838 |
Preparation of polycarbonates with bioxyanion catalyst
The invention discloses an improved process for the preparation of aryl polycarbonates. The process involves reacting aryl carbonate and dihydric phenol in the melt phase with a catalyst belonging...
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5286834 |
Melt preparation of copolycarbonate with alkaline compound catalyst and boric acid compound catalyst
A copolymeric polycarbonate containing repeating constituent units having formula [I] below and repeating constituent units having formula [II] below in a molar ratio of from 98:2 to 40:60....
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5278279 |
Process for producing (co)polycarbonate with transesterification catalyst and compound
A process for producing a (co)polycarbonate or a (co)polyestercarbonate having a high molecular weight and excellent hue, heat stability and mechanical properties by reacting a dihydroxyl compound...
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5266659 |
Solid state process for the preparation of high molecular weight poly(arylcarbonate)s from amorphous oligomer
The invention disclosed is an improved process for the preparation of high molecular weight poly(arylcarbonate), the molecular weight ranging from 45,000-60,000 (corresponding to n inh 0.8 to 1.0)...
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5264498 |
Polycarbonate resin composition
There is provided a polycarbonate resin composition having improved melt properties without impairing mechanical properties and transparency inherent in a polycarbonate resin, and suited for blow...
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