Abstract: The invention is an improved gas separation membrane comprising a thin, discriminating layer consisting predominantly of a carbonate polymer derived from a bisphenol corresponding to Formula I ##STR1## wherein R at each occurrence is independently H, Cl, Br, or C.sub.1 -C.sub.4 alkyl and R.sup.1 is ##STR2## --S--, --SO.sub.2 --, --O--, or a C.sub.1 -C.sub.6 divalent hydrocarbon or a C.sub.1 -C.sub.6 divalent fluorocarbon radical or inertly substituted hydrocarbon radical, with the proviso that at least 25 weight percent of the moieties derived from the bisphenol of Formula I present in the discriminating layer bear R groups which are exclusively Br or Cl, the gas separation membrane exhibiting a separation factor for oxygen and nitrogen at 24.degree. C. of at least 6.1. In another aspect this invention relates to a process for separating oxygen from nitrogen, or a nitrogen-containing gas.

Abstract: A method for the preparation of polycarbonate resins bearing terminal hydroxy ester groups comprises the interfacial polymerization of a dihydric phenol with a carbonyl halide in the presence of a molecular weight controlling proportion of a compound of the formula: ##STR1## wherein R represents alkylene of 1 to about 12 carbons. The novel product resins are useful as intermediate in the preparation of copolymers with, for example, polyesteramides.

Abstract: High molecular weight polyhalobisphenol polycarbonates are produced by adding phosgene to a polyhalobisphenol in the alkali metal phenate form whereby the chloroformates of the bisphenol are formed and then adding an activated pyridine such as 4-aminopyridines or 2-substituted pyridines to generate a high molecular weight polycarbonate having an inherent viscosity in the range from about 0.4 to about 0.9.

Abstract: In the present invention disclosed are high-molecular-weight, soluble, thermoplastic branched polycarbonates endowed with improved properties, and suitable to blow-moulding fabrication.Such polycarbonates are characterized by the presence, in their structure, of units deriving from the following double-ring aromatic compounds: ##STR1## wherein R.sub.1 indicates H, --COCL, --SO.sub.2 Cl; R.sub.2, R.sub.3 and R.sub.4, equal to or different from each other, indicate --COCl or SO.sub.2 Cl.The above-said compounds are directly used in the syntheses.

Abstract: A solid particulate olefin polymer containing monomer(s) dissolved therein is vigorously agitated mechanically to raise the temperature of the polymer to at least 90.degree. C. This vigorous agitation is effected in the absence of any purge gas and the unpolymerized olefin monomer desorbed from the polymer by the increase in temperature can readily be recovered and recycled to the polymerization vessel. The technique can form part of the work-up process in which the polymer is removed from the polymerization vessel and separated from unconverted monomer(s) prior to isolation. By this technique, propylene is removed from polypropylene without using a purge stream of nitrogen which makes recovery of the propylene difficult and expensive. The technique additionally heats up the polymer which can be advantageous for subsequent processing. Apparatus for effecting the process includes an agitation vessel which is connected, preferably through an intermediate separation vessel, to an olefin polymerization vessel.

Abstract: A reusable electrophotographic imaging element having a photoconductive surface layer in which the binder resin comprises a block copolyester or copolycarbonate having a fluorinated polyether block. The layer has low surface adhesion and affords improved transfer of toner images to receiver sheets.

Abstract: Cyclic monocarbonate bischloroformates are prepared by the reaction of a carbonyl halide such as phosgene with a bridged substituted resorcinol or hydroquinone such as bis(2,4-dihydroxy-3-methylphenyl)methane or bis(2,5-dihydroxy-3,4,6-trimethylphenyl)methane in the presence of aqueous alkali metal hydroxide. The cyclic monocarbonate bischloroformates may be used for the preparation of linear or cyclic polycarbonates containing cyclic carbonate structural units, which may in turn be converted to crosslinked polycarbonates.

Abstract: A polycarbonate containing from 25 to 100% by weight, based on the total carbonate bond-constituting units, of carbonate bond-constituting units each containing at least one pendant aromatic group, and having an average molecular weight of from 9,500 to 14,000.

Abstract: Block copolymers of the general formula --polycarbonate--G--polyether glycol-- wherein G is an ester aromatic carbonate and/or an ester-ester linkage, substantially free of aliphatic ether linkages are thermally stable in comparison with prior art block copolymers. They form compatible blends with a number of other thermoplastic resins to produce molded articles with improved resiliency. The block copolymers are produced from novel terminally functional end capped polyalkylene glycols.

Abstract: Linear thermoplastic polycarbonates derived from:(i) a carbonate precursor; and(ii) at least one dihydric phenol represented by the general formula ##STR1## wherein R is independently selected from hydrogen and lower alkyl radicals,X is selected from monocyclic cycloalkylidene radicals containing from 8 to about 16 ring carbon atoms, andn and n' are independently selected from whole numbers having a value of from 0 to 2 inclusive, with the proviso that the sum of n plus n' is at least one.

Abstract: A transparent optical article is disclosed, which is produced by molding a branched polycarbonate resin having a viscosity average molecular weight of from 13,000 to 20,000 as prepared from at least one dihydric phenol compound in the presence of a polyfunctional organic compound having at least two phenolic hydroxyl groups as a branching agent in an amount of from 0.02 to 3 mol % based on the total amount of the dihydric phenol compound. The transparent molded optical article includes digital audio discs, video discs, memory discs and lenses used in the optical reading system. The optical article is greatly reduced in double refraction and has a high mechanical strength.

Abstract: High molecular weight aromatic carbonate resin comprised of the polymerized reaction products of:(i) at least one dihydric phenol;(ii) a carbonate precursor; and(iii) an amount at least effective to improve the impact properties of said resin of at least one polymer selected from polymers represented by the formula ##STR1## thereof; wherein A is selected from the divalent residues of at least one polymerized and fully hydrogenated conjugated alkadiene and has a weight average molecular weight of at least about 600, and X is independently selected from halogen radicals.At lower amounts of (iii) these resins exhibit improved impact properties, while at higher amounts of (iii) the resins exhibit rubbery and elastomeric characteristics.

Abstract: Polycarbonates exhibiting improved heat resistances comprised of the reaction products of (i) a carbonate precursor and (ii) at least one dihydric phenol represented by the general formula ##STR1## wherein: R and R.sup.1 are independently selected from alkyl radicals;A is selected from divalent hydrocarbon radicals, ##STR2## and n is either zero or one.

Abstract: Novel heat resistant polycarbonates are provided which are the polymerized reaction products of:(i) a carbonate precursor; and(ii) at least one dihydric phenol selected from dihydric phenols represented by the general formulae ##STR1## wherein: each R.sup.1 is independently selected from halogen radicals, monovalent hydrocarbon radicals, and monovalent hydrocarbonoxy radicals;each R.sup.2 is independently selected from halogen radicals, monovalent hydrocarbon radicals, and monovalent hydrocarbonoxy radicals;R.sup.4 and R.sup.5 are independently selected from monovalent hydrocarbon radicals;R.sup.3 is selected from hydrogen and monovalent hydrocarbon radicals, with the proviso that if R.sup.3 is a hydrogen radical then at least one of the monovalent hydrocarbon radicals represented by R.sup.4 and R.sup.5 contains at least two carbon atoms;R.sup.7 is selected from hydrogen and monovalent hydrocarbon radicals;R.sup.

Abstract: High molecular weight, thermoplastic, randomly branched polycarbonates of an aromatic dihydric phenol, a carbonate precursor, and a chain branching agent comprising at least one compound selected from the formula: ##STR1## where A is selected from alkylene radicals from 1 to 6 carbons, alkylidene radicals from 2 to 6 carbons, cycloalkylene radicals and cycloalkylidene radicals containing from 4 to 6 carbon atoms;R and R' are independently selected from halogen radicals, monovalent hydrocarbon radicals of from 1 to 4 carbon atoms, and monovalent hydrocarbonoxy radicals of from 1 to 4 carbon atoms;n is an integer having a value of 0 or 1; andp and p' are integers having a value of 0 or 1.

Abstract: Linear thermoplastic polycarbonates derived from:(i) a carbonate precursor; and(ii) at least one dihydric phenol represented by the general formula ##STR1## wherein R is independently selected from hydrogen and lower alkyl radicals,X is selected from monocyclic cycloalkylidene radicals containing from 8 to about 16 ring carbon atoms, andn and n' are independently selected from whole numbers having a value of from 0 to 2 inclusive, with the proviso that the sum of n plus n' is at least one.

Abstract: This invention relates to branched polycarbonates that are made by transesterification having a triaryl tricarboxylic acid as a branching agent.

Abstract: Novel heat resistant polycarbonates are provided which are the polymerized reaction products of:(i) a carbonate precursor; and(ii) at least one dihydric phenol selected from dihydric phenols represented by the general formulae ##STR1## wherein: each R.sup.1 is independently selected from halogen radicals, monovalent hydrocarbon radicals, and monovalent hydrocarbonoxy radicals;each R.sup.2 is independently selected from halogen radicals, monovalent hydrocarbon radicals, and monovalent hydrocarbonoxy radicals;R.sup.4 and R.sup.5 are independently selected from monovalent hydrocarbon radicals;R.sup.3 is selected from hydrogen and monovalent hydrocarbon radicals, with the proviso that if R.sup.3 is a hydrogen radical than at least one of the monovalent hydrocarbon radicals represented by R.sup.4 and R.sup.5 contains at least two carbon atoms;R.sup.7 is selected from hydrogen and monovalent hydrocarbon radicals;R.sup.

Abstract: Thermoplastic aromatic copolyester-carbonate resin exhibiting improved processability derived from:(i) at least one monoester-diol which is the coreaction product of (a) at least one aromatic hydroxy carboxylic acid or an ester forming reactive derivative thereof, and (b) at least one diol selected from aliphatic diols, aliphatic ether diols, and aromatic diols;(ii) at least one dihydric phenol; and(iii) a carbonyl halide carbonate precursor.

Abstract: Polycarbonates are provided having improved critical thickness values based on an aromatic diphenol preferably bisphenol A and an aromatic diphenol thioether. By incorporating 2 up to 20 mole percent of the aromatic diphenol thioether based on the total diphenol content into the polymer, the critical thickness of the article molded from the polycarbonate is substantially improved.

Abstract: Novel polycarbonates are provided which exhibit rubbery and elastomeric properties which are the polymerized reaction products of:(i) a carbonate precursor; and(ii) at least one dihydric phenol represented by the general formula ##STR1## wherein R is selected from straight chain alkyl radicals containing from 8 to about 30 carbon atoms;each R.sup.1 is independently selected from halogen monovalent hydrocarbon, and monovalent hydrocarbonoxy radicals;each R.sup.2 is independently selected from halogen, monovalent hydrocarbon, and monovalent hydrocarbonoxy radicals; andn and n' are independently selected from whole numbers having a value of from 0 to 4 inclusive.

Abstract: The present invention relates to polycarbonate compounds characterized in that dimeric fatty acid ester soft segments are co-condensed therein. The invention further relates to processes for preparation of these compounds and their use in films and molded articles.

Abstract: A halogen-containing polycarbonate resin is formed by copolymerizing the following oligomers (a) and (b) in the presence of caustic alkali an organic solvent and water and in the substantial absence of bisphenol A:(a) 10 to 85 parts by weight of a polycarbonate oligomer with terminal groups consisting of chloroformate groups or chloroformate groups plus hydroxyl groups in a molar amount less than the chloroformate groups, having a number average molecular weight of 500 to 10,000 and containing no aromatic halogen or less than 4% by weight of aromatic halogen, and(b) 90 to 15 parts by weight of an aromatic halogen-containing polycarbonate oligomer with terminal groups consisting of chloroformate groups or chloroformate groups plus hydroxyl groups in a molar amount less than the chloroformate groups, having a number average molecular weight of 1,000 to 10,000 and containing 6 to 30% by weight of aromatic halogen.

Abstract: Aromatic polycarbonate chain terminated with a cyclic ester.

Abstract: The new thermoplastic copolyester carbonates which are based on polybutylene glycols and hexahydrophthalic acid or trimethyladipic acid, as well as admixtures of copolyester carbonates of this type with known polycarbonates are suitable for thermoplastic moulding compositions, particularly where good stability to solvents, such as petrol, is required.

Abstract: Novel carbonate polymers comprised of the reaction product of a dihydric phenol, a carbonate precursor, and at least one imide selected from the group of compounds represented by the formulae ##STR1##

Abstract: Ordered ester/carbonate copolymers having improved properties at higher solids are provided by (1) contacting a dihydric organic compound such as bisphenol-A with a diacid halide such as terephthaloyl chloride and a carbonate precursor such as phosgene under conditions sufficient to form an ester/carbonate oligomer and (2) contacting the oligomer with additional carbonate precursor to produce the desired ordered ester/carbonate copolymer.

Abstract: Improved flame retardance is imparted to high molecular weight aromatic polycarbonate resins by selecting appropriate fluorinated diphenols and incorporating them in homopolymers or copolymers. The fluorinated diphenols have at least one fluorinated alkyl or fluorinated aryl group upon the methylene carbon atom positioned between the two phenol ring structures. The polycarbonates having improved flame retardance are made from fluorinated diphenols and halogen-containing carbonate precursors. Copolycarbonates having improved flame retardance are derived from the fluorinated diphenols and non-fluorinated diphenols. The flame retardant polycarbonates may be used in films and molded articles where improved resistance to flame is desirable.

Abstract: This invention relates to block copolymers of polyphenylene oxides and sterically-hindered aromatic polycarbonates. These block copolymers can be molded, calendered, or extruded as films, sheets, fibers, laminates or other useful articles of manufacture.

Abstract: This invention relates to block copolymers of polyphenylene oxides and non-sterically-hindered high molecular weight aromatic polycarbonates. These block copolymers can be molded, calendered, or extruded as films, sheets, fibers, laminates or other useful articles of manufacture.

Abstract: This invention relates to block copolymers of polyphenylene oxides and non-sterically-hindered high molecular weight aromatic polycarbonates. These block copolymers can be molded, calendered, or extruded as films, sheets, fibers, laminates or other useful articles of manufacture.

Abstract: A polycarbonate transesterification process comprising reacting a bis(ortho-nitroaryl)carbonate and a dihydric phenol under transesterification reaction conditions.

Abstract: This invention relates to a non-catalyzed equilibrated interfacial polycondensation aromatic polycarbonate process comprising forming an equilibrated substantially uniform agitated two-phase admixture containing an organic phase containing an inert solvent, and an aqueous phase containing a solution of an aromatic dihydroxy compound and a strong base, adding and reacting a carbonyl halide with the aromatic dihydroxy compound to form an aromatic polycarbonate, and separating and recovering the solid aromatic polycarbonate particulate from the liquid aqueous phase.

Abstract: Copolycarbonate resins are prepared from an aromatic diol and a carbonic acid derivative. 2,2-bis(p-hydroxy-phenyl) 1,1,1,3,3,3-hexafluoropropane is co-reacted in a minor amount with the aromatic diol and carbonic acid derivative to form a polycarbonate having improved heat distortion characteristics.

Abstract: A polycarbonate transesterification process comprising reacting (ortho-alkoxycarbonylaryl)carbonates and dihydric phenol under transesterification reaction conditions.

Abstract: A polycarbonate transesterification process comprising reacting a bis(ortho-haloaryl)carbonate and a dihydric phenol under transesterification reaction conditions.

Abstract: The present invention relates to a process for the preparation of thermoplastic, aromatic polycarbonates which contain structural units of the formulae 1 and/or 2 ##STR1## in which R denotes C.sub.1 -C.sub.3 -alkyl, preferably CH.sub.3, andX denotes a single bond, C.sub.1 -C.sub.5 -alkylene, C.sub.2 -C.sub.5 -alkylidene, cyclohexylene, cyclohexylidene, --O-- or --S--.

Abstract: An improved polycarbonate transesterification process comprising reacting mixtures of bis(ortho-haloaryl)carbonate/-ortho-haloaryl aryl carbonate and a dihydric phenol under transesterification reaction conditions.

Abstract: A halogen-containing polycarbonate resin is formed by co-polymerizing:(a) 15 to 55 parts by weight of a polycarbonate oligomer with terminal chloroformate groups, having a number average molecular weight of 500 to 10,000 and containing no aromatic halogen or less than 4% by weight of aromatic halogen,(b) 20 to 80 parts by weight of a halogen-containing polycarbonate oligomer with terminal chloroformate groups, having a number average molecular weight of 1,000 to 10,000 and containing 6 to 30% by weight aromatic halogen, and(c) 5 to 25 parts by weight of bisphenol A.

Abstract: The present invention relates to a process for the preparation of bis-carbonic acid aryl esters of polyester-diols, lengthened via --OCOO-- groups, characterized in that polyester-diols with molecular weights Mn (number-average) of over 250, preferably over 600, are heated with carbonic acid bis-aryl esters at temperatures between about 100.degree. C. and 200.degree. C., preferably between about 110.degree. C. and 180.degree. C., in vacuo below about 35 mm Hg, preferably between about 25 and 1 mm Hg, in the presence of catalysts, less than one mol of carbonic acid bis-aryl ester being employed per OH group of the polyester-diol and the hydroxyaryl compounds formed being distilled off.

Abstract: Polycarbonate copolymers are provided consisting essentially of chemically combined bisphenol carbonate units and having from about 5 to 70 mole percent of such chemically combined bisphenol carbonate units in the form of o,p'-bisphenol dichloroethylene carbonate units. The polycarbonate copolymers have been found to possess valuable flame retardant properties and improved processability.

Abstract: The subject of instant invention is a process for the preparation of aliphatic-aromatic polycarbonates with diphenol carbonate end groups, the polycarbonates obtained therefrom and their use for the preparation of high-molecular, segmented, aliphatic-aromatic polycarbonate elastomers which can be processed as thermoplastics.

Abstract: This invention is concerned with a new class of halobisphenolethylene polycarbonate-polyester blends. More particularly, the invention is concerned with halobisphenolethylene polycarbonate-polyester blends which exhibit enhanced physical and/or chemical properties. The halobisphenolethylene polycarbonate-polyester blends are suitable for the manufacture of filaments, fibers, films, sheets, laminates and articles of manufacture including reinforced articles by conventional manufacturing techniques.

Abstract: A continuous process for obtaining highly pure, high molecular weight aromatic polycarbonates from highly pure, halogenated diphenols.

Abstract: UV stabilizing units are incorporated in a polycarbonate molecule to impart UV stability to the polycarbonate.

Abstract: This invention is concerned with a new class of halobisphenolethylene polycarbonate-polyetheramide-imide blends. More particularly, the invention is concerned with halobisphenolethylene polycarbonate-polyetheramide-imide blends which exhibit enhanced physical and/or chemical properties. The halobisphenolethylene polycarbonate-polyetheramide-imide blends are suitable for the manufacture of filaments, fibers, films, sheets, laminates and articles of manufacture including reinforced articles by conventional manufacturing techniques.

Abstract: A continuous process for obtaining highly pure, high molecular weight aromatic polycarbonates from highly pure, halogenated diphenols.

Abstract: Improved copoly(carbonate/phosphonate) compositions formed by reaction of a dihydric phenol, a carbonate precursor, and an organophosphorus dihalide are disclosed. The inherent viscosity and melting point of such compositions is increased by the presence of an effective amount of a chain branching agent, optionally in the additional presence of a chain terminating agent.

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.

Abstract: An improved polycarbonate transesterification process comprising reacting mixtures of bis(ortho-haloaryl)carbonate/-ortho-haloaryl aryl carbonate and a dihydric phenol under transesterification reaction conditions.