Abstract: The present invention relates to the use of polymeric microparticles that are gas-filled in hydraulically setting building material mixtures for the purpose of enhancing their frost resistance and cyclical freeze/thaw durability.

Abstract: The invention relates to coating agents having an antigraffiti effect. Said coating agents can be obtained according to a method consisting in condensing the organic silicon compounds of general formula (I): R1nSIX4-n, wherein R1 represents a group comprising 1-20 carbon atoms, X represents an alkoxy radical having 1-20 carbon atoms or halogen and n represents an even number between 0-3. The different radicals X or R1 can be identical or different and/or the precondensates can be obtained from said components. At least 50 wt. % of the silicon compounds, in relation to the total weight of the used silicon compounds, is represented by the formula R1SiX3, wherein R1 and X have the above-cited meaning, in order to form polysiloxanes until the ratio of signals R1SiO(OH) and signals R1SiO1,5 measured by NMR-spectroscopy ranges from 0.

Abstract: The invention relates to a process for the selective, economically viable preparation of methacrylic acid and methacrylic esters starting from acetone cyanohydrin, wherein, in a first step, 2-hydroxy-2-methylpropionic acid is prepared by reacting acetone cyanohydrin with sulphuric acid in the presence of water and a suitable polar solvent and is isolated and methacrylic acid is subsequently prepared by ?-elimination of water starting from 2-hydroxy-2-methylpropionic acid.

Abstract: By using a high molecular weight syrup phase comprising PMMA or PMMI, it is possible to distribute fillers in the polymerization batch so that the distribution of the fillers remains homogeneous during the polymerization. A homogeneous foam results.

Abstract: The present invention relates to mixtures for preparing transparent plastics, encompassing a) a prepolymer prepared from compounds of the formula (I) and (II) ?where each R1, independently of the others, is hydrogen or a methyl radical, each R2, independently of the others, is a linear or branched, aliphatic or cycloaliphatic radical, or a substituted or unsubstituted aromatic or heteroaromatic radical, and each of m and n, independently of the other, is a whole number greater than or equal to 0, where m+n>0, and from compounds of the formula (III), or from alkyl dithiols or from polythiols, preferably HS—R3—SH (III) where R3, identical with or different from R2, can be as defined for R2, and b) at least one monomer (A) capable of free-radical polymerization and having at least 2 methacrylate groups, and c) aromatic vinyl compounds, such as styrene, and d) if appropriate, a monomer capable of free-radical polymerization and having at least two terminal olefinic groups whose reactivity differs, and/o

Abstract: The invention relates to a process for continuously preparing alkylamino(meth)acrylamide by reacting methyl (meth)acrylate, ethyl (meth)acrylate or amines having a high boiling point compared to methanol or ethanol. A special workup technique allows product qualities which have hitherto not been attained to be achieved. In addition, very high space-time and overall yields can be achieved.

Abstract: The invention relates to self-cleaning synthetic bodies, obtained as follows: a) a siloxane coating (a) is applied to a synthetic substrate and cured, b) the polar fraction of the surface energy of the cured siloxane coating on the substrate is increased to a value of at least 10 mN/m and c) a coating (b) containing photocatalytically active TiO2 particles is applied to the synthetic substrate and cured.

Abstract: The invention relates to a multilayered film comprising at least one upper layer a), a middle layer b) made of (meth)acrylate copolymer, and a supporting layer c) made of polycarbonate. Upper layer a) contains a light-stability agent and is made of a (meth)acrylate copolymer that, together with the polycarbonate of supporting layer c), can form partially compatible mixtures. A test piece, which is made from a mixture consisting of 20% by weight of (meth)acrylate copolymer and 80% by weight of polycarbonate, has a breaking elongation (ISO 527-2) of at least 75% at 23° C. The middle layer b) contains a colorant and, optionally, a light-stability agent and is made from an identical or different (meth)acrylate copolymer that, together with the polycarbonate of supporting layer c), can form partially compatible mixtures.

Abstract: The invention describes a novel impact modifier, built up from core-shell1- and shell 2, the core being capable of plastic deformation. Good mechanical properties were achieved using a small amount of impact modifier.

Abstract: The invention relates to mixtures for preparing reactive hot melt adhesives based on (meth)acrylates having a polydispersity D of less than 1.8.

Abstract: The invention relates to a polymer mixture based on the (meth)acrylate (co)polymer components a), b), c), and/or d) according to claim 1, where a test specimen produced from the polymer mixture simultaneously has the following properties: I. a tensile modulus (ISO 527) of at least 2600 MPa, II. a Vicat softening point VSP (ISO 306-B50) of at least 109° C., III. an impact strength (ISO 179-2D, flatwise) of at least 17 kJ/m2, and IV. a melt index MVR (ISO 1133, 230° C./3.8 kg) of at least 1.5 cm3/10 min. The invention further relates to injection mouldings and to the use of the polymer mixture for producing injection-moulded parts.

Abstract: The invention relates to a method for extruding round rods from transparent plastics such as for example polymethylmethacrylate (PMMA), polycarbonate (PC) or polyethylene (PET) and to a method for producing said round rods.

Abstract: The invention relates to a polymer mixture, comprising a) a polymer matrix which is composed of a (meth)acrylate(co)polymer or of a mixture of (meth)acrylate(co)polymers with a Vicat softening point VSP (ISO 306-B50) of at least 104° C. and/or of a (meth)acrylimide(co)polymer, b) an impact modifier which is based on crosslinked poly(meth)acrylates and which does not have covalent bonding to the polymer matrix a), c) from 1 to 15% by weight of plastics particles composed of crosslinked polymers based on polymethyl methacrylate, on polystyrene and/or on polysilicones. The polymer mixture can be used to obtain injection mouldings with matt surfaces and Vicat softening points VSPs (ISO 306-B50) of at least 90° C.

Abstract: The invention relates to a novel impact-resistance modifier, constructed from a core-shell 1 and a shell 2, whereby the core is plastically deformable. The invention is characterised by excellent mechanical properties obtained by a low content of impact-resistance modifier.

Abstract: The invention relates to a process for the production of granules or powders, suitable as coating agents and binders for oral or dermal pharmaceutical forms, for cosmetics or food supplements, consisting essentially of (a) a copolymer, consisting of free radical-polymerized C1- to C4-esters of acrylic or methacrylic acid and further (meth)acrylate monomers which contain functional tertiary amino groups, (b) 3 to 25% by weight, based on (a), of an emulsifier having an HLB of at least 14, (c) 5 to 50% by weight, based on (a), of a C12- to C18-monocarboxylic acid or of a C12- to C18-hydroxyl compound, where the components (a), (b) and (c) are simultaneously or successively blended or mixed with one another, optionally with addition of a pharmaceutical active compound and/or further customary additives, fused in a heatable mixer, mixed, the melt is cooled and comminuted to give granules or powders.

Abstract: The invention relates to a novel, impact-resistant polymer based on PMMA.

Abstract: The invention relates to an improved method for producing foamed material, especially poly(meth)acrylimide foams, which are foamed from polymer plates produced according to the casting method. The two-step method consists of a pre-heating step and at least one foaming step. The product obtained has a significantly smaller compressive strain, measured according to DIN 53425(ASMD 621), than prior art products.

Abstract: The invention relates to a process for the preparation of a coating and binding agent for oral or dermal pharmaceutical forms, essentially consisting of (a) a copolymer consisting of free-radical-polymerized C1 to C4 esters of acrylic or methacrylic acid and further (meth)acrylate monomers which contain functional tertiary ammonium groups, the coplymer being present in powdered form having an average particle size of 1–40 ?m, (b) 3 to 15% by weight, based on (a), of an emulsifier having an HLB of at least 14 and (c) 5 to 50% by weight, based on (a), of a C12—to C18-monocarboxylic acid or a C12—to C18-hydroxyl compound, the components (a), (b) and (c) being blended or mixed with one another with or without addition of water and if appropriate with addition of a pharmaceutical active compound and further customary additives and the coating and binding agent being produced from the mixture by melting, casting, spreading or spraying. The invention further relates to the coating and binding agent itself.

Abstract: The invention relates to a method for production of a plastic body, made from a plastic obtained by means of a radical polymerisation with single- or multi-sided, inorganic coating containing silicon. The coating of a substrate is firstly achieved with a paint composition, containing inorganic particles in a solvent which can optionally contain additional flow improvers. One or more of such coated substrates can be used for the construction of a polymerisation chamber, in which the coated sides lie within the chamber. After radical polymerisation of a monomer mixture in the presence of a polymerisation initiator, the internal inorganic coating of the substrate transfers into or onto the surfaces of the radically polymerised plastic or of the plastic body. The invention further relates to the corresponding plastic body and the uses thereof.

Abstract: The invention relates to a method for regulating the minimal value of the pressure in the first half of the metering zone in a direction of conveyance in a single-screw degassing extruder or in a cascade extruder during the conveying of a melt consisting of a thermoplastic. The single-screw degassing extruder or the cascade extruder each have a first screw section (13), a degassing zone (14), a metering zone (22), and a measuring control loop (M), which includes a pressure measuring sensor (P) in the first half of the metering zone, a regulator (R) and an actuator (S) for influencing the pressure in the metering zone. The pressure is measured by the pressure measuring sensor (P) and is set by the regulator (R) and the actuator (S) so that the minimal value at the location of measurement ranges from 0.1 to 10 bar.