Abstract: The present invention relates to the transesterification of the carbonic acid aryl esters obtainable according to German Published Patent Specification No. 2,650,533 with an excess of diphenol for the preparation of polyalkylene oxide-diol bis-diphenol carbonates lengthened via carbonate groups. The present invention also relates to the polyalkylene oxide-diol bis-diphenol carbonates, lengthened via carbonate groups, obtained according to the invention and their use for the preparation of polyether/polycarbonates. Finally, the present invention relates to the polyether/polycarbonates, obtained according to the invention, with an improved phase separation between the elastomeric segment and hard segment, which leads to better technological properties of the corresponding polycarbonate elastomers.

Abstract: A polycarbonate process comprising contacting in the presence of a base, a .beta.-fluoroaliphatic carbonate, and a polyhydroxy compound selected from alcohols and/or phenols. The resulting polycarbonates are useful as polycarbonates per se, or useful in the preparation of high molecular weight polycarbonates which can be molded or formed into films, laminates or reinforced plastics by conventional techniques.

Abstract: Aromatic polycarbonates having chemically combined bisphenol-formal dimer units are provided and method for making such materials. The aromatic polycarbonates are injection moldable and have reduced glass transition temperatures.

Abstract: 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 the weight average molecular weight range is from about 25,000 to about 50,000 as determined by gel permeation chromatography.These copolymers exhibit improved impact strength, heat resistance, creep resistance, tensile strength at high temperates and stress crack resistance.

Abstract: 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 bisphenol and oligomeric aromatic polyformal having terminal phenolic groups. The aromatic block polymers are high performance thermoplastics having improved hydrolytic stability compared to aromatic polycarbonates and improved heat distortion temperature compared to conventional aromatic polyformal.

Abstract: 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 (4-hydroxyphenyl)dichloroethylene to a linear polycarbonate, and then agitating a solution of the resulting polycarbonate in the presence of a tertiary ogranic amine. The cyclic carbonates made by the aforementioned process are useful as flame retardants in polycarbonates.

Abstract: Flame retardant, thermoplastic copolycarbonates are made from dihydric aromatic compounds and dihydroxy benzene mono or di sulfonic acids in their alkali metal salt form. The copolycarbonates of this invention are more effective as fire retardants than the alkali metal salts of sulfonated polycarbonates prepared from dihydric aromatic compounds alone.

Abstract: High molecular weight aromatic polycarbonates, obtained from halogenated diphenols, having improved water vapor transmission and gas barrier properties as well as improved flame retardance.

Abstract: 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 aromatic monosulphonic acid chlorides are used as chain stoppers in amounts of about 2 mol % to 20 mol %, preferably in amounts of about 2.5 mol % to 10 mol %, relative to mols of the diphenols employed. In addition, the present invention relates to the aromatic polycarbonates obtainable by the process according to the invention.

Abstract: The invention relates to a process for the preparation of branched, thermoplastic, high-molecular weight and soluble polycarbonates having improved properties, by incorporation of 3,3-bis-(4-hydroxyaryl)-oxindoles as a branching agent. The invention further relates to the polycarbonates obtained in accordance with this process.

Abstract: Improved flame retardance and improved water vapor transmission are imparted to high molecular weight aromatic polycarbonate resins by selecting appropriate diphenols and controlling the degree to which these particular diphenols are halogenated.

Abstract: Resistance to high heat distortion is imparted to high molecular weight aromatic polycarbonate resins by controlling the degree to which particular diphenols are halogenated so that there are obtained either highly pure dihalogenated diphenols or predetermined statistical mixtures comprising predominantly mono- and dihalogenated diphenols together with some unreacted diphenol.

Abstract: 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 %, relative to mols of diphenols, of cyanuric chloride in a primary reaction, while controlling the pH and temperature and in the presence of a co-solvent, and thereafter the products are subjected to polycondensation, in accordance with known methods of the phase boundary process, to give high-molecular weight, branched polycarbonates. The invention further relates to the branched polycarbonates prepared by this process.

Abstract: The invention relates to statistical mixtures of halogenated bisphenols with halogen-free bisphenols and to processes for their preparation. This invention further relates to new aromatic, bromine-containing and/or chlorine-containing, high-molecular weight thermoplastic polycarbonates with good resistance to fire (oxygen index .gtoreq. 36%) and good flow properties, to their preparation from the statistical mixtures of halogenated bisphenols and halogen-free bisphenols and to their use alone or as a mixture with halogen-free polycarbonates or with thermoplastic polyesters for the preparation of moldings, films and fibers.

Abstract: There is described a family of copolyester compositions for producing heat nd flame resistant fibers, said compositions being prepared by polycondensating (A) an aromatic diacid, (B) a diol, (C) a tetrabrominated diol, (D) a derivative of a polyvalent metal, all said components being hereinbelow defined, the polycondensation process being carried out in several successive stages of copolycondensation of components (A), (B) and (C) until reaching a stable viscosity, then adding component (D), and stopping the reaction before the intrinsic viscosity of the composition decreases below a value proper for subsequent spinning.

Abstract: The present invention relates to polycondensates of the formula 10, their use for absorbing metal ions of the transition elements of the periodic system and their use for the preparation of polymers containing metals of formula 11 which have e.g. improved resistance to heat and to chemicals compared to the corresponding polycondensates of formula 10.

Abstract: A novel process is disclosed for the preparation of polyester carbonates containing both carboxylate and carbonate groups. The process is based on the making of a mixed polyanhydride ester of a dibasic acid which is reacted with a dihydroxy compound to form a hydroxy containing intermediate that is subsequently transformed into a polyester carbonate by means of a carbonate forming reagent.

Abstract: The present invention is concerned with aromatic thermoplastic polycarbonates which contain at least about 0.5 mole % of structural units derived from 1,1,3,4,6-pentamethyl-3-(3,5 dimethyl-4-hydroxyphenyl)-indan-5-ol. The polymers disclosed herein may be homopolymers of these units or copolymers with other aromatic dihydroxy compounds and/or tri or higher functional branching agents. These homopolymers or copolymers may be used per se or they may be blended with other thermoplastic resins, particularly other aromatic polycarbonates. In addition, these polymers may be used to prepare coatings which may be cross-linked by heat treatment or radiation or they may be used as the base for graft polymerization.

Abstract: A thermoplastic molding composition comprising a chlorine containing bisphenol polycarbonate and a polyester derived from a cyclohexanedimethanol.

Abstract: A method is described for dehydrochlorinating 1,1,1-trichloro-2,2-bis(4-hydroxyphenyl)ethane employing a refluxing dipolar aprotic solvent, such as dimethylformamide, containing a lithium halide catalyst to produce a crystalline product consisting essentially of 1,1-dichloro-2,2-bis(4-hydroxyphenyl) ethylene. The crystalline product can be isolated in substantially pure form and converted to a high impact, flame retardant polycarbonate.