Abstract: Aromatic copolyamides, process for preparing them and their use for the production of shaped structuresAromatic copolyamide which is soluble in organic solvents, and a process for its preparation, which contains the recurring structural units (I), (II) and (III) ##STR1## to the extent of at least 90 mol % and 0 to 5 mol % of end groups of the structural units (IV) ##STR2## The sum of the molar proportions of (II) and (III) is in the ratio of 0.9:1 to 1.1:1 to the molar proportion of (I), and at the same time the molar proportions of (II) and (III) are in a ratio to one another of 60:40 to 10:90.The copolyamides are suitable for the production of shaped articles or for coatings and for the production of fibers, membranes and films.

Abstract: A process for purifying aromatic carbonate polymers, including polycarbonates and polyestercarbonates, is disclosed. Accordingly a carbonate polymer in an organic solvent is rendered virtually free of low molecular weight components by agitation with aluminosilicate or by passing through layers of such aluminosilicate. The aluminosilicate is subsequently separated off and the carbonate polymer is isolated in known methods.

Abstract: 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.

Abstract: 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, the amount of water in the reaction medium is controlled such that high ionic strength conditions resulting from high salt concentrations are reached at the end of phosgenation and the pH of the medium is controlled to a range between 8 and 10 whereby excess phosgene usage is less than about 15% of theoretical conditions.

Abstract: A process for the redistribution of an organic polycarbonate composition. The process involves melt equilibrating a starting polycarbonate composition (which may be a single polycarbonate or a mixture of polycarbonates, and may be or include recycled polycarbonate) having an initial weight average molecular weight in the presence of a carbonate redistribution catalyst and in the absence of branching agents, under conditions such that a redistributed polycarbonate composition is formed having a weight average molecular weight different from, and typically lower than, the initial weight.

Abstract: Provided by this invention are two-part liquid polysulfide compositions which utilize stable and effective manganese dioxide or like curing agents which provide reasonable working times and gel times typically a maximum of 90 minutes and desirably rapid cure rates. Also, provided are stable and effective manganese curing compositions suitable for use as an element of such two-part liquid polysulfide compositions.

Abstract: Thermally depolymerizable polyoxalate and polymalonate polymers which contain hydrocarbon groups having from 6 to 30 carbon atoms and a tertiary carbon atom attached to at least one of the bridging oxygen atoms in the structure are usable as binders for powdered glass ceramic or metallic materials, and as rheological control agents in paste formulations.

Abstract: 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 by means of a suitably selected observer or filter system on the basis of a process model with an empirical Mark-Houwink relation adapted to the process. The variables estimated by the observer/filter are converted into control variables which are used to set input streams of the production process. Product quality is kept constant, changes in load or set values are quickly intercepted and even disturbances not readily accessible to measurement are taken into account by the process control.

Abstract: A process for preparing polycarbonate from a bisphenoxy fluorene in which, to obtain a reaction mixture in which the bisphenoxy fluorene is dissolved, the bisphenoxy fluorene is reacted with a carbonate precursor at an elevated temperature, for example about 50.degree. C. or more.

Abstract: Polyketones can be formed in enhanced yield by conducting the polymerization of the carbon monoxide and olefin monomers used to form the polyketone in a gas phase polymerization process in the presence of an effective amount of a liquid, non-polymerizable diluent which is effective in increasing the amount of polyketone formed over that which would be formed in the substantial absence of the diluent. Preferably, the catalyst is supported on a high surface area support (e.g., a carbon monoxide-ethylene high surface area support). Hydrogen gas can be used to reduce the molecular weight and increase the bulk density and thermal stability of the polyketone product.

Abstract: This invention relates to medical devices formed totally or in part from homopolymers or copolymers comprising recurring carbonate moieties.

Abstract: A method of preparing aliphatic-aromatic polycarbonate resin is disclosed. Accordingly, the method entails reacting an oligocarbonate of diphenol having chlorocarbonic acid ester terminal groups, with an aliphatic diol, in a non-aqueous solvent. The amount of solvent is such that the oligocarbonate is about 10-40% relative to the total weight of solvent, oligocarbonate and diol.

Abstract: 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 dicarboxylic acid, and (B) eliminating the hydrogen chloride and carbon dioxide by-products. The oligocarbonate of diphenol is characterized in that it is terminated by chlorocarbonic acid ester groups. The resins thus prepared are readily molded conventionally.

Abstract: The invention describes new biphenyl dianhydrides, and new polyimides and copolyimides made from the dianhydrides. The synthesized polyimides exhibit significantly enhanced solubility when the biphenyl dianhydrides are substituted, particularly at the 2 and 2' positions on the phenyl rings.

Abstract: A process for producing a binder resin is disclosed, which comprises blending in a reactor a raw monomer for a first polymerization system and a raw monomer for a second polymerization system which undergoes polymerization through a reaction path different from a reaction path of said first polymerization system and then conducting said first and second polymerization reactions in the same reactor. A toner and a developer composition employing the binder resin are also disclosed. The binder resin can easily be pulverized and can give toners and developer compositions which hold a good charge and from which an environmentally stable fixed image can be obtained.

Abstract: 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 with a diester of carbonic acid and/or a diester of dicarbonic acid in the presence of a transesterification catalyst, wherein at least part of the reaction process is conducted in the presence of a specified organic phosphorus compound, or, in the presence of a specified organic phosphorus compound and a hindered phenol compound. A (co)polycarbonate or (co)polyester-carbonate composition having excellent hue, heat stability and mechanical properties, comprising a (co)polycarbonate and/or a (co)polyestercarbonate and, a specified organic phosphorus compound, or, a specified organic phosphorus compound and a hindered phenol compound.

Abstract: A process for the production of polycarbonates is disclosed. Accordingly, oligocarbonate in the melt is passed through a heated tube and inert gas is simultaneously introduced by injecting to the melt.

Abstract: Anhydrous polymeric metal terephthalate and isophthalate fibers are disclosed and a method for making them wherein said metal is selected from the group consisting of calcium, barium, magnesium and zinc, said fibers have an average aspect ratio of greater than about 5:1. These fibers are very useful additives serving as property extenders and/or reinforcing agents in polymeric compositions and articles molded therefrom.

Abstract: This invention relates to a foam, a foam-resin composite and a method of making foam-resin composites. The foam set forth in this invention comprises a urethane modified polyisocyanurate derived from an aromatic amino polyol and a polyether polyol. In addition to the polyisocyanurate foam, the composite of this invention further contains a resin layer, wherein the resin may be epoxy, bismaleimide, or phenolic resin. Such resins generally require cure or post-cure temperatures of at least 350.degree. F.

Abstract: Polycarbonates are prepared by inducing the melt polycondensation of an aromatic dihydroxy compound and a diester carbonate in the presence of alkali metal compounds and/or alkaline earth metal compound droxy and adding to the polycarbonate which is the reaction product thereof: a sulfonic acid compound having the formula ##STR1## in an amount to 0.05-10 ppm, based on the polycarbonate, and also an epoxy compound in an amount of 1-2000 ppm, based on the polycarbonate.