Abstract: Cyclic polycarbonate mixtures containing units derived from spirobiindane bisphenols, preferably 6,6'-dihydroxy-3,3,3',3'-tetramethylspirobiindane are prepared from the corresponding bischloroformates or mixtures thereof with bisphenols. They may be homopolymeric or copolymeric; cyclic oligomer mixtures are preferred. Such oligomers may be converted to linear polycarbonates having high glass transition temperatures.

Abstract: A process for producing a polycarbonate resin having a viscosity-average molecular weight of from 9,000 to 50,000 by reacting at least one bisphenol compound with phosgene or a carbonate, characterized in that a phenol compound having the formula: ##STR1## wherein R is an alkyl group having from 5 to 7 carbon atoms, and R is located at the ortho- or para-position relative to the OH group, is used as a molecular weight modifier.

Abstract: A hydrophilic film-forming composition which comprises a resin paint comprising a resin binder component and a paint vehicle with a solid ion exchange resin powder dispersed in the vehicle. A film produced therefrom has durable hydrophilic properties, and when combined with a suitable undercoat corrosion resistance is also improved.

Abstract: The present invention relates to bis-quinoxalines of the formula I ##STR1## their preparation, their use as branching agents for the preparation of branched, thermoplastic polycarbonates and the branched thermoplastic polycarbonates.

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: Polycarbonates exhibiting improved heat distortion temperatures which are comprised of the polymerized coreaction products of (i) a carbonate precursor, and (ii) at least one particular spiro dihydric phenol. These carbonate polymers are useful in the production of molded articles, sheet glazing materials, and films.

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: The invention relates to an aromatic, high molecular weight thermoplastic copolycarbonate comprising the reaction product of a sulfur-free aromatic diphenol, a sulfur-containing diphenol, a branching agent and a carbonic acid derivative, characterized in having improved flame resistance. The invention further relates to a process for the preparation of said copolycarbonate.

Abstract: An optical element including an optical resin composition consisting essentially of a polycarbonate is disclosed. Said optical resin composition have a melt flow rate of more than or equal to 5.0 g/10 min. as measured based on ISO R-1133 Standard under the condition of 230.degree. C. and 5 kgf. and have a glass transition point of more than or equal to 100.degree. C. Said polycarbonate include a major repeating unit represented by the formula (I) or (II). ##STR1## wherein Ar.sub.1 and Ar.sub.2 each represent an arylene group or a cycloalkylene group; R represents an alkylene group, a cycloalkylene group, --O--, --O--Ar.sub.3 --O--, --S--, --SO--, --SO.sub.2 --, --SO.sub.2 --Ar.sub.3 --SO.sub.2 --, --R.sub.1 --Ar.sub.4 --R.sub.1 --, --O--R.sub.1 --O--, ##STR2## --CONH--R.sub.1 --NHCO--, or --Ar.sub.5 --R.sub.1 --; Ar.sub.3 and Ar.sub.4 each represent a phenylene group or a bisphenylene group; R.sub.1 represents an alkylene group; R.sub.2 represents an alkyl group; Ar.sub.

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: Novel polyphenolic compounds are disclosed. These compounds have utility as branching agents in the production of novel, randomly branched polycarbonates ##STR1## .

Abstract: Flame retardant polycarbonate compositions are prepared from dihydric aromatic compounds and alkali metal hydrogen sulfite. These compositions are more effective than similar compositions containing alkali metal sulfites.

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: 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: High molecular weight processible polymers derived from 2,6- and 2,7-diacids, diols and diamines of 9,10-dihydro-9,10-ethanoanthracenes and various complementary comonomers are prepared. These are converted into rigid, thermally-stable anthraceno polyesters and polyamides by thermal removal of the 9,10-ethano bridge.

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: 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: 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: High molecular weight processible polymers derived from 2,6- and 2,7-diacids, diols and diamines of 9,10-dihydro-9,10-ethanoanthracenes and various complementary comonomers are prepared. These are converted into rigid, thermally-stable anthraceno polyesters and polyamides by thermal removal of the 9,10-ethano bridge.

Abstract: Meta,para-substituted isopropylidene bisphenols are provided and methods for making such materials. Phenol, or substituted phenol is condensed with a meta-substituted isopropenyl phenol or a meta-hydroxy-.alpha.,.alpha.-dimethylbenzyl alcohol in the presence of an acid catalyst. The resulting meta,para-substituted isopropylidene bisphenols can be used as stabilizers for polyvinyl chloride resins and as intermediates for making high performance thermoplastics having chemically combined meta,para-isopropylidene diphenoxy units.

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: 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: 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: Novel copolycarbonates exhibiting generally improved impact resistance, clarity and flame resistance are prepared by blending a polycarbonate of a trityldiol such as phenolphthalein and a polycarbonate of another diol such as bisphenol-A under conditions of temperature and/or shear sufficient to cause reaction of the polycarbonates.

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.