Abstract: The invention relates to thermoplastic moulding materials based on acrylonitrile-butadiene-styrene, comprising a SAN-polymer matrix and a graft copolymer, structured from an agglomerated butadiene rubber-graft base and a SAN-graft envelope. The agglomerated graft base has a bimodal particle size distribution of a fraction x) of non-agglomerated particles having a d50-value in the range from 80 to 120 nm and a fraction y) of agglomerated particles having a d50-value in the range from 350 to 550 nm and a polydispersity U of less than 0.28. The invention further relates to a method for producing the graft copolymer, wherein an acrylate copolymer having a polydispersity U of less than 0.27 and a d50-value of 100 to 150 nm is used for agglomeration. The invention further relates to the use of thermoplastic moulding materials for producing moulded parts.

Abstract: The invention relates to thermoplastic molding materials based on acrylonitrile-butadiene-styrene, comprising a SAN-polymer matrix and a graft copolymer, structured from an agglomerated rubber-graft base and a SAN-graft envelope. The basis of the graft base is a diene rubber having a vinyl-aromatic ratio of 10.5 to 24.5 wt %. The agglomerated graft base has a bimodal particle size distribution of a fraction x) of non-agglomerated particles having a d50-value in the range from 80 to 120 nm and a fraction y) of agglomerated particles having a d50-value in the range of 350 to 550 nm and a polydispersity U of less than 0.28. The invention further relates to a method for producing the graft copolymer, wherein an acrylate copolymer having a polydispersity U of less than 0.27 and a d50-value of 100 to 150 nm is used for agglomeration. The invention further relates to the use of thermoplastic molding materials for producing molded parts.

Abstract: The invention relates to thermoplastic polycarbonate compositions which are impact-modified with ABS type polymers, said polycarbonate compositions being impact-modified with ABS type polymers are characterized by their excellent low temperature ductility, good processing properties expressed by relatively high melt volume rate (MVR) and good hydrolytic stability.

Abstract: A thermoplastic molding composition comprising a graft polymer is disclosed. The graft polymer contains: a) a continuous phase containing the polymerized product of at least one vinylaromatic monomer and at least one ethylenically unsaturated nitrile monomer, and b) a disperse phase containing ethylene/?-olefin rubber that is grafted with the polymerization product of at least one vinylaromatic monomer and at least one ethylenically unsaturated nitrile monomer. The weight average molecular weight of the continuous phase is 130,000 to 275,000 g/mole and the disperse phase is characterized in that its, weight average particle size is less than 0.90 ?m. The molding composition is characterized in improved resistance to weathering.

Abstract: A thermoplastic molding composition comprising a graft polymer is disclosed.

Abstract: The present invention provides a method for polymerizing conjugated diolefins in the presence of a catalyst of the rare earth metals and in the presence of an aromatic vinyl compound. The diolefins produced thereby may find use in producing rubber-modified molding materials, such as ABS and HIPS.

Abstract: A process for the preparation of superabsorbent polymers by alkaline hydrolysis of polyacrylonitrile emulsions is disclosed. In an embodiment of the invention the process comprise preparing a PAN emulsion, subjecting the emulsion to alkaline hydrolysis, neutralizing the hydrolysate followed by drying, granulation and modifying the surface of the granular polymer by crosslinking. The process is characterized in that the isolation of the superabsorbent polymer entails neither alcohols nor organic solvents.

Abstract: A description is given of a process and an apparatus for the removal of volatile constituents, in particular solvents, monomers or oligomers, from polymer compositions or polymer solutions by evaporating the volatile components from the preheated polymer compositions in the form off free-falling films, strands (4) or foaming liquids in an evaporator system (1). In the process, following partial or complete degassing of the volatile components in the degassing space (9) of the evaporator system (1), the degassed polymer composition (4) is received at the lower end of the evaporator system (1) directly by a discharge delivery device (5) and is discharged, thereby avoiding contact of the polymer with the inside wall of the evaporator system (1).

Abstract: Conjugated diolefins, optionally in combination with other unsaturated compounds which may be copolymerised with the diolefins, are polymerised by performing the polymerisation of the diolefins in the presence of catalysts based on rare earth compounds, cyclopentadienes and organoaluminium compounds in the presence of aromatic vinyl compounds as the solvent at temperatures of −30 to +100° C.

Abstract: A process for the preparation of superabsorbers is disclosed. The process entails subjecting a polyacrylonitrile precipitation polymer alkaline hydrolysis to obtain a hydrolysis product. The hydrolysate that may optionally be neutralized is dried and ground and optionally modified by crosslinking of its surface. The inventive superabsorber is suitable for the preparation of nappies, incontinence articles, water-storage materials and electric cable coverings.

Abstract: Conjugated diolefins, optionally in combination with other unsaturated compounds which may be copolymerized with the diolefins, are polymerized by performing the polymerization of the diolefins in the presence of catalysts based on monocyclopentadienyl compounds of vanadium and alumoxanes in the presence of aromatic vinyl compounds as the solvent at temperatures of −30 C. to +80 C. By means of the process according to the invention, it is possible to straightforwardly produce solutions of polydiolefins, such as polybutadiene, having 1,2 unit contents of 10 to 30% in aromatic vinyl compounds, which solutions may then, for example, be further processed to yield ABS or HIPS.

Abstract: Impact modified styrene polymers can be prepared by a continuous process for the production of a solution of rubber in vinyl aromatic monomers.

Abstract: A process for producing impact-resistant moulding compositions, which is characterised in that a monomer mixture comprising 90 to 20 parts by weight of an aromatic monoalkenyl compound, 10 to 50 parts by weight of an ethylenically unsaturated nitrile, 0 to 30 parts by weight of other copolymerisable compounds is polymerised by a radical mechanism in the presence of 15 to 50 parts by weight, per 100 parts by weight of monomers, of a soluble, gel-free butadiene polymer, and in the presence of 50 to 200 parts by weight, per 100 parts by weight of monomers, of a solvent, wherein the solvent is selected from the group comprising an aliphatic (C1-C8) or cycloaliphatic alcohol, ketone, ether, ester, nitrile (A) or mixtures thereof or a mixture of (A) with an aliphatic (C4-C10), cycloaliphatic or aromatic hydrocarbon (B) in an A:B weight ratio of 100:0 to 30:70, and the polymerisation is conducted as far as a polymer content of the total mixture of 30 to 70% by weight, with thorough mixing and optionally with

Abstract: A thermoplastic molding composition containing 1 to 99 parts by weight of aromatic polycarbonate or polyester carbonate and 1 to 99 parts by weight of at least one graft polymer prepared by solution polymerization is disclosed. The graft polymer is characterized in having rubber content of 20 to 50 wt. % and in that the average particle size of its rubber phase is 80 to 600 nm. The composition, which optionally contains additives, flameproofing agents and reinforcing agents, is characterized by its improved mechanical properties.

Abstract: A process for the preparation of superabsorbers is disclosed. The process entails subjecting a polyacrylonitrile precipitation polymer alkaline hydrolysis to obtain a hydrolysis product. The hydrolysate that may optionally be neutralized is dried and ground and optionally modified by crosslinking of its surface. The inventive superabsorber is suitable for the preparation of nappies, incontinence articles, water-storage materials and electric cable coverings.

Abstract: A process for the preparation of superabsorbent polymers by alkaline hydrolysis of polyacrylonitrile emulsions is disclosed. In an embodiment of the invention the process comprise preparing a PAN emulsion, subjecting the emulsion to alkaline hydrolysis, neutralizing the hydrolysate followed by drying, granulation and modifying the surface of the granular polymer by crosslinking. The process is characterized in that the isolation of the superabsorbent polymer entails neither alcohols nor organic solvents.

Abstract: Conjugated diolefins, optionally in combination with other unsaturated compounds which may be copolymerized with the diolefins, are polymerized by performing the polymerization of the diolefins in the presence of catalysts based on cobalt compounds, organoaluminum compounds and modifiers in the presence of aromatic vinyl compounds at temperatures of −30° C. to +80° C. By means of the process according to the invention, it is possible straightforwardly to produce solutions of polydiolefins, such as polybutadiene, having different 1,2 unit contents in aromatic vinyl compounds, which solutions may then, for example, be further processed to yield ABS or HIPS.

Abstract: A continuous process for the manufacture of impact resistant polymers is disclosed. The process comprise polymerization of a reaction mixture containing vinylaromatic monomers in the presence of soluble rubber and entails shearing at least some of said mixture at a rate of more than 30000 1/s using a device having no rotating parts. The resulting product is characterized in its low gloss and improved impact properties.

Abstract: Fluorine-containing compositions for treating substrates to render them oil-, water- and soll-repellant, comprising a fluorine-containing acrylic copolymer and a fluorine-free poly(meth)acrylate.

Abstract: Substrates which have been provided with an oil-, water- and soil-repellant treatment from the group consisting of naturally occurring and synthetic textiles and their mixtures, leather, mineral substances, thermoplastic and thermosetting polymers and paper, comprise fluorine-containing compositions which comprise two components A and B.Component A is a fluorine-containing acrylic copolymer with the following comonomers:a) (meth)acrylates containing perfluoroalkyl groupsC.sub.n F.sub.2n+1 --X--O--CO--CR.sup.1 .dbd.CH.sub.2 (I),b) monomers from the group consisting of styrene, acrylonitrile, vinyl acetate, vinyl propionate and monomers,CH.sub.2 .dbd.CR.sup.4 --CO----OR.sup.5 (II),c) monomers ##STR1## and d) monomersCH.sub.2 .dbd.CR.sup.11 COO--CH.sub.2 CH.sub.2 N(R.sup.9, R.sup.10) (IVa)or in quaternized form?CH.sub.2 .dbd.CR.sup.11 --COO--CH.sub.2 CH.sub.2 N(R.sup.9 R.sup.10 R.sup.12)!.sup..sym. Y.sup..crclbar. (IVb)or in N-oxidized form ##STR2## or of the formulaCH.sub.2 .dbd.CR.sup.13 --COO.sup..sym. Z.sup.