Abstract: The present invention relates to thermoplastic high-Tg polycarbonates and moulding materials which are distinguished by improved thermal properties and improved mechanical properties, in particular by reduced thermal expansion. The present invention furthermore relates to a process for the preparation of these polycarbonates. In particular, this invention relates to polycarbonates which the structural unit which derives from phthalimide of the formula (I) and polycarbonate compositions and moulding materials therefrom as well as a process for the preparation of these polycarbonates, and the use thereof, in particular as reflectors and display substrates.

Abstract: The present invention relates to polycarbonates comprising imide-containing aryl mono- or dihydroxy compounds as chain terminators and, respectively, monomer units, and also to compositions comprising the said polycarbonates, to their use for the production of mouldings, and to mouldings obtainable therefrom.

Abstract: The invention relates to compositions containing at least one copolycarbonate containing one or more bisphenol building blocks and one or more further specific (co)polycarbonates as well as compositions which optionally contain additives, the use thereof for the production of shaped articles, and shaped articles obtainable therefrom.

Abstract: The present invention relates to a heat-absorbing polymer composition containing a transparent thermoplastic synthetic substance, an inorganic infrared absorber with stabiliser and also to the production and use of the polymer compositions according to the invention and to the products produced therefrom. In particular, the present invention relates to the stabilisation of inorganic IR absorbers from the group of the tungsten compounds and also to the use of the polymer composition according to the invention containing these stabilised inorganic IR absorbers for the purpose of producing windowpanes for use in buildings, motor vehicles, rail vehicles or aircraft.

Abstract: The present invention relates to polycarbonate compositions having improved surface hardness, processes for the preparation thereof and the use thereof for the production of blends, shaped articles and extrudates.

Abstract: The invention relates to a polycarbonate composition with improved melt-flowability together with good optical properties and together with good hydrolysis resistance.

Abstract: 3,4-Polyalkylenedioxythiophene dispersions comprising polyanions and cationic 3,4-polyalkylenedioxythiophenes, in particular those of the formula (I) in which n is an integer from 3 to 100, preferably from 4 to 15, and X is —(CH2)x—CR1R2—(CH2)y—, where R1 and R2, independently of one another, are H, an optionally substituted alkyl radical having from 1 to 20 carbon atoms, an aryl radical having from 6 to 14 carbon atoms or —CH2—OR3, where R3=H, alkyl or —CH2—CH2—CH2—SO3H, and x and y are each, independently of one another, an integer from 0 to 9, in which at least 90% of the particles are <50 nm, can be employed in electroluminescent arrangements having a long service life and high luminosity.

Abstract: The present invention relates to compositions having improved rheological properties which are based on polycarbonate having rearrangement structures and cyclic and linear oligomers and also mouldings and extrudates composed of these polycarbonate compositions.

Abstract: The invention relates to polycarbonates that comprise defect structures and cyclic oligomers and have improved properties. The invention also relates to molded articles and extrudates made from said polycarbonates.

Abstract: The invention relates to the use of alkylphenols for adjusting the molecular weight of polycarbonates and compositions of these polycarbonates with additives chosen from the group of heat stabilizers, mould release agents and light stabilizers, the use thereof for the production of mouldings and mouldings obtainable therefrom.

Abstract: A multi-layer article is disclosed. The article contains a base layer that contains at least one thermoplastic resin and a second layer containing a thermoplastic (co)polyformal superimposed over the base layer. The (co)polyformal conforms to formulae (1a) or (1b), in which O-D-O and O-E-O independently denote a diphenolate group, -D- and -E- independently denote an aromatic group having 6 to 40 carbon atoms, k is a whole number from 1 to 1500, o stands for numbers from 1 to 1500, and m is z/o and n is (o-z)/o wherein z is 0 to o.

Abstract: Copolycarbonates comprising alkylphenolchain terminator groups for adjusting the molecular weight, compositions of these copolycarbonates with additives chosen from the group of heat stabilizers and mould release agents, the use thereof for the production of moldings and moldings obtained therefrom.

Abstract: An optical data storage comprising a thermoplastic copolycarbonate is disclosed. The copolycarbonate contains at least one unit derived from dihydroxydiphenyl ether and at least one unit derived from at least one member selected from the group consisting of 4,4?dihydroxybiphenyl and 1,1-bis-(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane.

Abstract: A thermoplastic molding composition comprising (co)poly(ester)carbonate, and a cyclic oligoformal is disclosed. The composition that is characterized in its lowered water absorption and improved flowability is suitable for a variety of application including in particular optical data storage media.

Abstract: Multifunctional 3,4-alkylenedioxythiophene derivatives represented by formula (I) are described, In formula (I), n and m each independently of each other, and independently for each o, are an integer from 1 to 5, and o is 3 or 4. The groups R1, R2, R3 and R4 are independently of each other and independently for each o, selected from, for example, hydrogen, halogen and optionally substituted linear or branched C1-C20-alkyl. The group R— of formula (I) may be, independently for each o, hydrogen or a thiophene represented by the following formula (II), in which m, n, R1, R2, R3 and R4 are as described in formula (I). The group X— of formula (I) is a polyvalent linking unit (e.g., a triphenylamine radical). Also described are electrically conductive oligomers and polymers comprising the multifunctional 3,4-alkylenedioxythiophene derivatives of the present invention as a repeating or crosslinking unit.

Abstract: A branched polycarbonate and processes for its preparation are disclosed. The polycarbonate contains structural units conforming to in which R1, R2, R3 and R4 mutually independently denote C1-C10 alkyl, R5, R6 and R7 mutually independently denote hydrogen or C1-C10 alkyl, or R1 and R2, and R3 and R4, with the carbon atom to which they are attached, form a C5-C10 cycloalkyl group, wherein the cycloalkyl group may be substituted.

Abstract: A thermoplastic molding composition comprising polycarbonate and at least one (co)polyformal is disclosed. Characterized by its low water absorption the composition is particularly suitable for producing molded articles, especially optical data carriers, such as compact disks, video disks, digital versatile disks and optical data carriers that are writable and erasable once or repeatedly.

Abstract: A thermoplastic molding composition comprising polycarbonate and at least one aromatic formal is disclosed. The formal conforms to The composition that is characterized by its reduced water uptake, is useful especially for the production of optical data carriers, such as compact discs.

Abstract: A branched (co)polyformal is disclosed. The (co)polyformal contains structural units conforming to at least one the general formulae (1a) and (1b) wherein each of -E- and -D- independently of one another denote an aromatic radical having 6 to 40 C atoms, k is 1 to 4,000, o is 1 to 4,000, m is z/o and n is (o-z)/o, where z is 0 to o. The branched (co)polyformal is characterized by its reduced water uptake and improved hydrolytic stability. Also disclosed are processes for its preparation and use in the production of molded articles.

Abstract: A thermoplastic molding composition comprising a linear (co)polyformal is disclosed. The (co)polyformal corresponds to formulae (Ia) or (Ib), in which A independently denotes hydrogen or phenyl, —O-D-O— and —O-E-O— independently denote a diphenolate residue, in which -E- and -D- independently denote an aromatic radical having 6 to 40 C atoms, wherein at least one of —O-D-O— and —O-E-O— denotes 1,1-bis(4-hydroxyphenyl)cyclohexane residue. The composition is characterized in its restricted water absorption. Also disclosed is a process for the preparation of the composition.