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4210741 |
Phenolphthalein-dihydroxy aromatic compound polycarbonates
Phenolphthalein-dihydroxy aromatic compound polycarbonates are disclosed wherein the mole ratio of phenolphthalein to dihydroxy aromatic compound is in the range from about 0.05 to about 0.7 and...
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4210731 |
Aromatic polyformal-polycarbonate block polymers and method for making same
There are provided aromatic polyformal-polycarbonate block polymers and method for making such materials. The polyformal-polycarbonate block polymers can be made by phosgenating a mixture of a...
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4197394 |
Method for making cyclic carbonates and polymers therefrom
A method is provided for making cyclic carbonates of 2,2-bis(4-hydroxyphenyl)-1,1-dichloroethylene, such as the cyclic trimer, by effecting the polymerization of the aforementioned bis...
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4194038 |
Poly(ester-carbonates) from dicarboxylic acid chlorides
A process for poly(ester-carbonates) from dihydric phenols, especially bisphenol A; aromatic or cycloaliphatic dicarboxylic acids, especially terephthalic acid; and phosgene as carbonate precursor...
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4188475 |
Process for the preparation of flame-retardant polycarbonates
The present invention relates to the preparation of aromatic polycarbonates, by the two-phase interface process, from diphenols, preferably from halogen-free diphenols, characterized in that...
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4185009 |
Branched, high-molecular weight thermoplastic polycarbonates
The invention relates to a process for the preparation of branched, thermoplastic, high-molecular weight and soluble polycarbonates having improved properties, by incorporation of...
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4174437 |
Process for the preparation of branched polycarbonates
The present invention relates to a process for the preparation of branched thermoplastic polycarbonates, characterized in that diphenols are completely reacted with about 0.05 to about 2.0 mol %,...
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4156769 |
Process for making polycarbonates using 1,1-dimethyl urea compounds as the catalysts
Thermoplastic polycarbonates are prepared by interfacial polymerization wherein carbonyl halides, dihydric phenols and a catalytic amount of a 1,1-dimethyl urea compound is reacted. The...
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4153780 |
Process for the preparation of polycarbonate with weatherproof property
A process is provided for preparing a polycarbonate composition with excellent weatherproof properties. The process comprises adding an ultraviolet absorbing compound having a hydroxy group which...
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4139687 |
Cyclic carbonate trimer of 2,2-bis(4-hydroxyphenyl)-1,1-dichloroethylene
The cyclic carbonate trimer of 2,2-bis(4-hydroxyphenyl)-1,1-dichloroethylene is provided which can be employed as a flame retardant for a variety of thermoplastic organic polymers, such as high...
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4127561 |
Polycarbonates and a process for their preparation
The present invention provides thermoplastic aromatic polycarbonates and a process for their production according to the phase boundary polycondensation process, characterized in that tertiary...
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4111910 |
Polycarbonates having carbamate terminal groups
Aromatic polycarbonates having carbamate end groups are prepared using a terminating amount of ammonia, ammonium compounds, primary cycloalkyl, aliphatic, or aralkyl amines and secondary...
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4059566 |
Process for controlling the molecular weight of polycarbonates using ammonia or ammonia compounds
Process for the preparation of aromatic polycarbonates by the interfacial technique wherein the molecular weight is controlled by adding an effective amount of ammonia or ammonium compounds to the...
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4055544 |
Process for making polycarbonates using ammonia or ammonia compounds as the catalysts
Thermoplastic polycarbonates are prepared by interfacial polymerization wherein carbonyl halides, dihydric phenols and a catalytic amount of ammonia or an ammonium compound which liberates ammonia...
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4054552 |
Thermal oxidatively stable polycarbonate
A thermal oxidatively stable polycarbonate composition stabilized with a minor amount of an ester of a phosphorodihalidous acid and to a process for preparing a thermal oxidatively stable polymer....
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4038252 |
Phase boundary process for the preparation of aromatic polycarbonates using a chlorinated aromatic hydrocarbon as the polymer solvent
The present invention provides a process for the preparation of a polycarbonate by the phase boundary condensation method, by phosgenation of an aqueous alkali metal salt solution of one or more...
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4025489 |
Utilization of bisphenol-A from the alkaline phase generated in the production of polycarbonates
This invention relates to polycarbonates and more particularly to recovering unreacted bisphenol-A from the alkaline phase generated in the production of polycarbonates, comprising reacting the...
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4020045 |
Process for controlling the molecular weight of aromatic polycarbonates
Process for the preparation of aromatic polycarbonates by the interfacial technique wherein the molecular weight is controlled by adding an effective amount of metallic sulfites to the...
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4001184 |
Process for preparing a branched polycarbonate
A process for preparing a thermoplastic randomly branched aromatic polycarbonate which process comprises reacting at least 20 weight percent of a stoichiometric quantity of a carbonate precursor...
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3945969 |
Continuous production of polycarbonates
High molecular weight linear polycarbonates are prepared by continuous condensation of organic dihydroxy compounds and phosgene in two reaction zones, a mixture of an aqueous-alkaline solution of...
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3931108 |
Process for preparing polycarbonates
Extruded films having reduced proneness to stress-cracking, good resistance to casting resins of unsaturated polyesters and no blocking effect and produced from branched aromatic polycarbonates...
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3912687 |
Process for preparing halogen-substituted aromatic polycarbonates
A process is provided for making high molecular weight halo-substituted aromatic polycarbonates in a phase boundary reaction in which an o,o,o',o'-tetrahalogenobisphenol and phosgene are reacted in...
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3879348 |
Saponification-resistant polycarbonates
Polycarbonates are provided which have the repeating structural units: ##SPC1## Wherein: R is CH 3 , C 2 H 5 or CH(CH 3 ) 2 and X is a bond, an alkylene or alkylidene group with 1 to 5 carbon...
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3816373 |
BRANCHED AROMATIC POLYCARBONATE COMPOSITION
An intermediate composition consisting of the reaction product of at least 3 moles of a dihydric phenol with 1 mole of a trifunctional compound having as its functionality hydroxyl or carboxyl...
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3674740 |
PROCESS OF PRODUCING POLYCARBONATE
For carrying out phase boundary surface reactions of components, e.g., production of polycarbonates from phosgene, Bisphenol A, sodium hydroxide and water a reaction tube is used, which comprises a...
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3660083 |
POLYARYLALKANE-TERMINATED, SOLVENT-RESISTANT POLYCARBONATE RESINS AS PHOTOCONDUCTORS
Polyarylalkane-terminated polycarbonate resins are disclosed which when utilized in photoconductive layers and elements show superior stability and resistance to lixiviation by the carrier liquid...
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3546165 |
SOLUBLE HIGH-MELTING,THERMALLY STABLE LINEAR POLYESTERS
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3541049 |
CYANURIC CHLORIDE BRANCHED POLYCARBONATES
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3530094 |
POLYCARBONATES
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3519605 |
POLYORTHOCARBONATE POLYMERS AND COPOLYMERS AND METHOD OF PREPARING SAME
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3516968 |
POLYCARBONATES FROM ADAMANTYL BISPHENOLS
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3505289 |
LINEAR AROMATIC POLYESTERS
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3480585 |
POLYCARBONATE RESINS
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3468846 |
POLYCARBONATE PLASTICS
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3466260 |
POLYCARBONATES OF 1,4-BIS(P-HYDROXYCUMYL) BENZENE
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3461098 |
POLYCARBONATES OF THE BISPHENOL OF CYCLOHEXADIENE
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3442854 |
QUATERNARY AMMONIUM PHOSPHONIUM AND ARSONIUM CATALYSTS FOR THE PRODUCTION OF POLYCARBONATES BY THE TRANSESTERIFICATION METHOD
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3437639 |
PROCESS FOR PURIFYING POLYCARBONATES
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3428600 |
CARBONATE POLYMER SYNTHESIS
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3419526 |
HIGH MOLECULAR WEIGHT THERMOPLASTIC POLYCARBONATES
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3399172 |
Thermoplastic condensation polymers terminated with particular imide groups
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3398120 |
Polyesters of diacid halide, alkyl bisphenol and glycol
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3379801 |
Increased crystallizability of polycarbonates
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3326958 |
Process for the preparation of carbonic and carboxylic acid derivatives
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3297634 |
Cyclic dicarbonate
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3290409 |
Preparation of polycarbonate resins
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3282893 |
Process for preparing synthetic resins
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3277054 |
High molecular weight resins
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3275601 |
Manufacture of polycarbonates using tertiary amines, quaternary amines and salts thereof as catalysts
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3274214 |
Aromatic carbonates
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