Abstract: The present invention provides a moulding composition, which includes: a plurality of bead polymers dispersed in at least one matrix polymer; wherein the bead polymers: have an average particle size of 5 to 40 &mgr;m, and have a refractive index nD at 20° C. which is different from a refractive index nD at 20° C. of said matrix polymer; and wherein the bead polymers are prepared by a process, which includes: contacting: at least one polymerizable mix which includes at least 50% by weight of at least one (meth)acrylate monomer, at least one aluminum compound, and an aqueous phase, to prepare a mixture; dispersing the mixture at a shear rate ≧103 s−1 to form a dispersion, wherein the dispersion is stabilized by the aluminum compound; and polymerizing to produce the bead polymers having an average particle size of 5 to 40 &mgr;m.

Abstract: Products based on polymethylmethacrylate (PMMA) so resistant to yellowing and so highly transparent that even the edges of plates produced from this material have a neutral colour, i.e. do not display any yellow tone. This effect is obtained by the admixture of 5 to 50 ppm inorganic, reducing phosphorus compounds after polymerisation. This enables the brightener content to be reduced under 10 ppb, and so the end product may also be used in contact with foodstuffs.

Abstract: A process for the production of hydrogen cyanide is provided, wherein hydrogen cyanide is synthesized by reacting methane or methane-containing natural gas, ammonia and oxygen-enriched air or oxygen in the presence of a catalyst comprising platinum or a platinum alloy; wherein the reactants are present in the following molar ratios [ O 2 ] [ O 2 + N 2 ] = 0.25 ⁢   ⁢ to ⁢   ⁢ 1.

Abstract: Self-reinforced, thermoplastically moldable sheets made from poly(meth)acrylate having at least two layers which differ in their filler content. The ratio between the elongation at break of the layer with higher filler content and the elongation at break of the layer with lower filler content is less than 1.5. The poly(meth)acrylate sheets can serve as a semifinished product for producing sanitary items, such as bathtubs, shower trays or washbasins, preferably by thermoforming, without the need for any other reinforcing layers sprayed on or otherwise applied after molding.

Abstract: The invention describes a polymer with high transmission for UV rays, this transmission being preserved even after prolonged exposure to UV light (tanning lamps). The polymer is further characterized by a low residual monomer content (determined as methyl methacrylate).

Abstract: A stabilized monomer composition containing at least one ethylenically unsaturated monomer and a combination of N,N-diethylhydroxylamine an N-nitroso-N-phenylhydroxylamine or its salt in a weight ratio of from 1:1 to 10:1 permits the synthesis of 2-hydroxyalkyl (meth)acrylates in particularly high yields and remains stable during prolonged storage.

Abstract: A self-reinforcing semifinished product capable of thermoplastic shaping, composed of a single-layer sheet made from filled poly(meth)acrylate, where the semifinished sheet product contains a filler and has an upper side and a lower side, where the upper side is depleted with respect to fillers and the lower side is enriched with respect to fillers, in relation to the average filler content and a process for producing the semifinished products. The semifinished poly(meth)acrylate sheet products of the invention may be used in producing sanitary items, such as shower trays and washbasins, preferably by a high-performance shaping process, such as thermoforming.

Abstract: A light-permeable, IR-reflecting body which contains a stiff, amorphous base material comprised of light-permeable plastic and IR-reflecting particles which are oriented parallel to the surface, said light-permeable IR-reflecting body having a transmissivity (T) in the visible range of 45-75%, an overall energy permeability (g) of 30-60%, and a T/g ratio of >1.15, and the IR-reflecting particles oriented parallel to the surface are disposed in a coating layer comprised of a transparent water-insoluble binder, which layer is 5-40 micron thick and adheres to the base material, wherewith red-reflecting particles with a layer of titanium dioxide 60-120 nm thick on a platelet-shaped carrier pigment are present in the aforesaid coating layer in the amount of 20-40 wt. % of said coating layer.

Abstract: An apparatus for calibrating hollow chamber sheet extruded lines out of thermoplastic resin includes a vacuum housing and a planar intake area at a first end of the vacuum housing. The planar intake area is configured to receive the extruded line. Support rollers within the vacuum housing are configured to support the extruded line. The extruded line exits the vacuum housing through a planar outlet area located at a second end of the vacuum housing opposite the first end.

Abstract: The invention relates to a method for producing block-shaped and plate-shaped polymethacrylimide foamed materials by copolymerizing methylacrylic acid and methylacryl nitrile, by subjecting the copolymerizate to a post-polymerization and cyclization in order to form polyimide, and by converting the same into a foamed material. The invention is characterized in that the copolymerization is carried out in the presence of a mixture containing at least three initiators with graduated half-life periods. The polymerization can be controlled especially well and yields polymerizate plates with thicknesses of up to 80 mm which can be easily foamed. The invention makes it possible to produce filling materials, especially plates and blocks containing electrically conductive particles.

Abstract: A diaphragm for an electroacoustic transducer has a) a core layer containing poly(meth)acrylimide foam and b) at least one cover layer. The diaphragm is produced by laminating the cover layer with the core layer, using a pressure of 0.4 MPa and a temperature of 160° C., whereby at least the side of the core layer which comes into contact with the cover layer is compressed. The resultant composite is subsequently cooled to a temperature below 80° C., before the pressure is reduced to the ambient pressure. The process can be carried out as a single-step process. The diaphragms produced by this process demonstrate an excellent stability, whereby the cover layers in particular are highly resistant to separation.

Abstract: An aqueous dispersion for the production of binders or coatings for solid oral drugs having a water content of 90-40 wt. % and a solids portion of 10-60 wt. %, whereby said solids portion is composed of: (A) 10-99 wt. % of a polymer mixture consisting of: (a) 75-99 wt. % of a polymethacrylate copolymer consisting of up to 98-85 wt. % of alkyl (meth)acrylate monomers with C1-C4 alkyl residues and up to 2-15 wt. % of alkyl (meth)acrylate monomers with a quaternary ammonium group in the alkyl residue, and (b) 25-1 wt. % of an alkali salt of carboxymethylcellulose having a weight average molecular weight of less than 150,000, and (B) 90-1 wt. % of at least one substance normally added to pharmaceutical formulations.

Abstract: The invention relates to a method for the production of a coating and excipient agent for oral or dermal dosage forms, consisting of (a) 35-98% by weight of a copolymer consisting of radically polymerized C1-C4 esters of acrylic or methacrylic acid and additional (meth)acrylate monomers having functional tertiary ammonium groups and (b) 1-50% by weight of a softener and 1-15% by weight of an emulgator with an HLB value of less than 14, wherein constituents (a), (b) and (c) are mixed with or without adding water and optionally adding a pharmaceutical active substance and other conventional additives and the coating and excipient agent is produced by melting, casting, spreading or spraying. The invention is characterized in that the copolymer (a) is applied in powder form with a mean particle size of 1-40 &mgr;m.

Abstract: A transparent plastic pane of acrylic glass with internal plastic filaments, which largely hold together the fragments formed in the event of a break characterized in that the plastic filaments are at least partly sized. The internal filaments can be sized completely and/or partly, for example in portions. Hereby the matrix adhesion of the filaments can be adjusted to the effect that any fragments which may be formed in the event of break are largely held together by the filaments without permitting undesired detachment of the filaments during thermal stresses in the normal range of −20 to 120° C. The plastic panes are suitable in particular as a noise protection wall.

Abstract: A process for the synthesis and recovery of di(meth)acrylic acid esters at a high degree of purity. Di(meth)acrylic acid esters are produced by transesterfication of (meth)acrylic acid esters of C1 to C4 alcohols with 1,n-diols (where n≧3) in the presence of a zirconium catalyst that comprises a chelate of zirconium with a 1,3-dicarbonyl compound. These catalysts can be readily separated or removed from the reaction mixture by precipitation with phosphoric acid, thus providing a convenient and inexpensive method of producing a di(meth)acrylic acid ester with a reduced level of zirconium.

Abstract: The invention relates to the use of a multilayer pharmaceutical product that substantially comprises a) a core containing a pharmaceutically active substance, b) an inner coating consisting of a copolymer or a mixture of copolymers that are composed of 85 to 98 wt.- % of radically polymerized C1 to C4 alkyl esters of the acrylic or methacrylic acid and 15 to 2 wt.- % of (meth)acrylate monomers with a quaternary ammonium group in the alkyl group, and c) an outer coating consisting of a copolymer that is composed of 75 to 95 wt.- % of radically polymerized C1 to C4 alkyl esters of the acrylic or methacrylic acid and 5 to 25 wt.- % of (meth)acrylate monomers with an anionic group in the alkyl group. The inventive product is used for producing a pharmaceutical product that releases the active substance contained therein according to the USP release test, at pH 1.2 during 2 hours and subsequent rebuffering to pH 7.0, by less than 5% after 2.

Abstract: By copolymerisation of compounds which are acid or have a hydroxy or epoxy function in a casting resin with a filler contents of between 10 and 80%, moulded parts on a polymethylmethacrylate basis are obtained which pass the B1-test even without addition of fire-retardant agents and in addition present improved mechanical properties.

Abstract: The invention relates to a method for the production of a coating and excipient agent for oral or dermal dosage forms, consisting of (a) 35-98% by weight of a copolymer consisting of radically polymerized C1-C4 esters of acrylic or methacrylic acid and additional (meth)acrylate monomers having functional tertiary ammonium groups and (b) 1-50% by weight of a softener and 1-15% by weight of an emulgator with an HLB value of less than 14, wherein constituents (a), (b) and (c) are mixed with or without adding water and optionally adding a pharmaceutical active substance and other conventional additives and the coating and excipient agent is produced by melting, casting, spreading or spraying. The invention is characterized in that the copolymer (a) is applied in powder form with a mean particle size of 1-40 &mgr;m.

Abstract: A storage stable monomer/polymer composition comprises a component A and a component B. Component A comprises an emulsion polymer formed by the polymerization of 1-99% by weight of a C1-C10 alkyl acrylate, 99-1% by weight of C1-C10 alkyl methacrylate, and 0-0.5% by weight of a first graft component, which is then swollen by a mixture of at least one ethylenically unsaturated monomer and a polymerization initiator. Component B also comprises an emulsion polymer formed by the polymerization of 1-99% by weight of C1-C10 alkyl acrylate, 99-1% by weight of C1-C10 alkyl methacrylate, and 0-0.5% by weight of a second graft component, swollen with at least one ethylenically unsaturated monomer and a polymerization activator. Curing of the monomer/polymer composition begins only after the water has evaporated from the dispersion. The aqueous monomer/polymer compositions are used as binders for road marking paints, floor coating compositions, coating materials and sealing compositions.

Abstract: The invention relates to a method for reducing the polymer content in the wastewater from dewatering of two-phase liquid mixtures comprising a thermoplastic plastic melt and an aqueous phase by coagulating the plastic melt and pressing the water out of the melt cake in an extruder system, characterized in that superheated steam with a temperature of at least 280° C. is injected immediately after introduction of the two-phase liquid mixture into the extruder system.