Abstract: The invention relates to compositions for producing polymethacrylimide foams having reduced pore size. The inventive method allows production of a microporous foam with an especially homogeneous pore size distribution without having to use insoluble nucleation agents.
Type:
Grant
Filed:
July 23, 2004
Date of Patent:
May 13, 2014
Assignee:
Evonik Rohm GmbH
Inventors:
Jonas Scherble, Werner Geyer, Hermann Seibert, Leonhard Maier, Torsten Jahn, Thomas Barthel
Abstract: The present invention relates to a process for preparing polyalkylene glycol di(meth)acrylates by reacting polyalkylene glycol with (meth)acrylic anhydride, wherein the reaction mixture contains at most 0.5% by weight of metal compounds and/or amines, the reaction is carried out in the presence of polymerization inhibitors and the reaction temperature is at least 60° C.
Type:
Grant
Filed:
May 5, 2009
Date of Patent:
May 6, 2014
Assignee:
Evonik Röhm GmbH
Inventors:
Thorben Schuetz, Joachim Knebel, Mario Gomez Andreu
Abstract: The invention relates to a process for continuously preparing N-alkyl(meth)acrylamides by reacting alkyl(meth)acrylates with high-boiling amines. A catalyst activation and specific workup technique achieve product qualities which have not been achieved to date. In addition, very high space-time yields and overall yields can be achieved.
Type:
Grant
Filed:
March 3, 2010
Date of Patent:
March 18, 2014
Assignee:
Evonik Röhm GmbH
Inventors:
Bardo Schmitt, Wolfgang Klesse, Martina Ebert, Dirk Broell, Guido Protzmann, Joachim Knebel, Thomas Kehr, Hans-Gerhard Stadler, Gerhard Koelbl, Benedikt Laux
Abstract: Acrylic materials with antimicrobial activity are tumble blended, melted and extruded through an extruder. The resulting polymer compounds include an acrylic resin, such as methylmethacrylate polymers, copolymers and multipolymers, and blends thereof, silver-containing antimicrobial additives; and optional additives such as impact modifiers, flow promoters, stabilizers and coloring agents. The properties of the acrylic materials, especially the antimicrobial performance, are strongly dependent on the manufacturing process conditions, including feed resins pre-drying, residual moisture content, screw speed and melt temperature. The materials composition and manufacturing procedures are equally significant.
Type:
Application
Filed:
February 7, 2012
Publication date:
January 16, 2014
Applicant:
EVONIK RÖHM GmbH
Inventors:
Dimo K. Dimov, Lawrence N. Gabriel, Florian Lyon, Christopher R. Spain, Peter D. Colburn, Craig T. Schmidter, Zhen Zhu
Abstract: Provided is a molding composition comprising, based on the total weight of the composition, (A) 50.0% by weight to 99.5% by weight of at least one (co)polymer which is a homopolymer or copolymer of at least 80% by weight of methyl methacrylate, (B) 0.5% by weight to 50.0% by weight of at least one copolymer obtained by polymerization of a monomer, and (C) at least one low molecular weight (meth)acrylate (co)polymer having a solution viscosity in chloroform at 25° C. (ISO 1628—part 6) of less than or equal to 55 ml/g.
Type:
Grant
Filed:
June 26, 2012
Date of Patent:
November 26, 2013
Assignee:
Evonik Röhm GmbH
Inventors:
Klaus Schultes, Werner Hoess, Nils Mehler
Abstract: The present invention relates in general terms to a process for preparing alkyl methacrylates, comprising as steps: providing an acetone cyanohydrin by a process according to one of the preceding claims; contacting the acetone cyanohydrin with an inorganic acid to obtain a methacrylamide; contacting the methacrylamide with an alcohol in the presence of an inorganic acid in a reactor to obtain an alkyl methacrylate; continuously discharging at least a portion of the alkyl methacrylate from the reactor into a distillation column as a vapor stream; the discharge being effected by feeding a discharge stream comprising steam into the reactor, to an apparatus for preparing alkyl methacrylates, to a process for preparing polymers based at least partly on alkyl methacrylates, to the use of the alkyl methacrylates obtainable by the process according to the invention in chemical products, and to chemical products based on alkyl methacrylates obtainable by the process according to the invention.
Type:
Grant
Filed:
August 31, 2007
Date of Patent:
November 19, 2013
Assignee:
Evonik Röhm GmbH
Inventors:
Udo Gropp, Robert Weber, Thomas Schaefer, Andreas Perl, Rudolf Sing, Thomas Mertz
Abstract: The invention relates to an oral, multiparticulate form of administration, comprising pellets in the size ranging from 50 to 2500 $g(m)m which are substantially constituted of a) an inner matrix layer containing nanoparticles that contain a nucleic acid active ingredient and being embedded in a matrix of a polymer having a mucoadhesive effect, and b) an outer film coating, substantially consisting of an anionic polymer or copolymer that is optionally formulated with pharmaceutically conventional adjuvants, especially emollients.
Type:
Grant
Filed:
November 5, 2005
Date of Patent:
October 29, 2013
Assignee:
Evonik Röhm GmbH
Inventors:
Rosario Lizio, Hans-Ulrich Petereit, Dave Trupti, Michael Gottschalk
Abstract: The invention relates to a vented extruder (1) for the devolatilization of a polymer material. The vented extruder (1) encompasses at least one drive (4), at least one gearbox (5), at least one rotatably driven extruder screw (3), at least one first material feed (6) and at least one extrudate outlet (13). A feature of the vented extruder (1) according to the invention is that the drive, encompassing drive (4) and gearbox (5), has been provided in the region of that end of the extruder screw (3) that is downstream in relation to the direction of conveying of the polymer.
Type:
Grant
Filed:
August 12, 2008
Date of Patent:
September 17, 2013
Assignee:
Evonik Röhm GmbH
Inventors:
Ruediger Carloff, Joachim Heid, Heinz Vetter
Abstract: A block-copolymer containing at least two different blocks wherein block A contains (meth)acrylate monomers the copolymer having a glass transition temperature of less than 15° C., block B contains (meth)acrylate monomers the copolymer having a glass transition temperature of more than 25° C. being free of thio-containing substances in the polymer chain, characterized in that one block contains at least one photoinitiator chemically bound to the chain.
Type:
Application
Filed:
March 12, 2013
Publication date:
August 1, 2013
Applicants:
Evonik Rohm GmbH, Henkel AG & Co. KGaA
Abstract: The invention relates to a process for preparing a (meth)acrylate copolymer containing tertiary amino groups by free-radical polymerization in solution from a monomer mixture selected from a) 30 to 70% by weight of a C1-C4-alkyl ester of acrylic acid or methacrylic acid and b) 70 to 30% by weight of an alkyl ester of acrylic acid or methacrylic acid with a tertiary amino group in the alkyl radical and c) 0 to 10% of further copolymerizable vinyl monomers, whereby one or more polymerization initiators, optionally one or more molecular weight regulators and one or more solvents or of a solvent mixture are added to the monomer mixture to give a polymerization mixture, which is polymerized at temperatures from 30 to 120° C.
Type:
Application
Filed:
October 13, 2010
Publication date:
July 25, 2013
Applicant:
EVONIK RÖHM GmbH
Inventors:
Christian Meier, Andreas Weber, Johannes Vorholz, Alpertunga Kueksal, Andreas Klosendorf, Pamela Boehmann, Marcus Denger, Norbert Hoffmann, Nikolaos Papadopoulos
Abstract: The invention relates to block copolymers produced by means of controlled polymerization and that have at least one block A or B comprising (meth)acrylate monomers and copolymerizable monomers, and a block P on the basis of functionalized polymers.
Type:
Application
Filed:
February 15, 2013
Publication date:
July 4, 2013
Applicants:
Evonik Rohm GmbH, Henkel AG & Co. KGaA
Abstract: The invention relates to an improved method for the continuous production of alkyl(methyl)acrylates by transesterification of methyl(meth)acrylate with alcohols that are heavy in comparison with methanol. A special processing technique makes it possible to obtain new levels of product quality. Very high space-time-overall yields can also be obtained. The invention is characterized by the multiple use of a homogeneous catalyst which thereby reduces the costs of auxiliary agents significantly.
Type:
Grant
Filed:
November 21, 2003
Date of Patent:
June 11, 2013
Assignee:
Evonik Röhm GmbH
Inventors:
Jochen Ackerman, Horst Hiltner, Hermann Siegert
Abstract: The invention relates to the use of non-transparent, methacrylate-containing one-, two- or multi-layered films in flexible photovoltaic systems, and to the production of said films by extrusion coating, extrusion lamination (adhesive lamination, melt lamination or hotmelt lamination) or glue lamination. For this purpose, e.g. a thin, inorganic or metallically coated film, for example made of PET, is laminated or coextruded with a weather-resistant film, e.g. a film made of PMMA or PMMA polyolefin coextrudate. In particular, laminates are produced in which at least one of the two layers is non-transparent. An optional inorganic oxide or metal layer has the property of a high barrier effect against water vapour and oxygen while the PMMA layer exhibits weather resistance stability.
Abstract: The invention relates to a process for preparing (meth)acrylate-based ABA triblock copolymers with a silyl functionalization of the A blocks.
Type:
Grant
Filed:
April 14, 2009
Date of Patent:
April 30, 2013
Assignees:
Henkel AG & Co. KGaA, Evonik Rohm GmbH
Inventors:
Sven Balk, Gerd Loehden, Holger Kautz, Christine Troemer, Monika Maerz, Lars Zander, Jens Lueckert, Johann Klein, Thomas Moeller
Abstract: The present invention relates to a process for preparation of pure methacrylic acid, at least comprising the process steps: a) gas phase oxidation of a C4 compound to obtain a methacrylic acid-comprising gas phase, b) condensation of the methacrylic acid-comprising gas phase to obtain an aqueous methacrylic acid solution, c) separation of at least a part of the methacrylic acid from the aqueous methacrylic acid solution to obtain at least one crude methacrylic acid-comprising product; d) separation of at least a part of the methacrylic acid from the at least one crude methacrylic acid-comprising product by means of a thermal separation process to obtain a pure methacrylic acid.
Type:
Grant
Filed:
November 17, 2008
Date of Patent:
April 23, 2013
Assignee:
Evonik Röhm GmbH
Inventors:
Martin Koestner, Gerhard Koelbl, Ralf Meier
Abstract: The present invention relates to a coating composition comprising at least one photo-initiator and at least one (meth)acryl-polymer having units that are derived from (meth)acryl-monomers that have at least one double bond and 8 to 40 carbon atoms in the alkyl residue. The present invention furthermore relates to a monomer mixture comprising at least one (meth)acryl-monomer having at least one double bond and 8 to 40 carbon atoms in the alkyl residue and at least one photo-initiator monomer and a (meth)acryl-polymer that can be obtained by polymerization of said monomer mixture. The present invention furthermore relates to a method for producing a coating. The present invention furthermore relates to a coated object comprising a coating obtained by said method.
Type:
Grant
Filed:
March 30, 2010
Date of Patent:
April 16, 2013
Assignee:
Evonik Röhm GmbH
Inventors:
Christine Maria Breiner, Gerold Schmitt, Thorben Schuetz, Joachim Knebel, Ina Zwierzchowski, Margarita Stein
Abstract: The present invention relates to a (meth)acrylate monomer of the general formula (I) in which R1 is hydrogen or a methyl group, X is oxygen or a group of the formula NR? in which R? is hydrogen or a radical having 1 to 6 carbon atoms, R2 is an alkylene group having 1 to 22 carbon atoms, Y is oxygen, sulphur or a group of the formula NR?, in which R? represents hydrogen or a radical having 1 to 6 carbon atoms, and R3 is an unsaturated radical having 8 carbon atoms and at least two double bonds. The present invention further relates to a process for preparing the monomers set out above, to polymers obtainable from this monomer mixture, and to coating materials which comprise the stated polymers.
Type:
Grant
Filed:
August 31, 2009
Date of Patent:
April 9, 2013
Assignee:
Evonik Röhm GmbH
Inventors:
Thorben Schuetz, Joachim Knebel, Mario Gomez Andreu, Ralf Jackstell, Matthias Beller, Anne Grotevendt, Christine Maria Breiner