Rohm Gmbh

Rohm Gmbh Chemische Fabrik

Klaus Langerbeins

Dieter Tessmer

Wolfgang Klesse

Herbert Fink

Wilhelm Elser

Wolfgang Ruppert

Karl-Josef Folsch

Werner Ude

Wilhelm Gruber

Horst Dinklage

Gerhard Emig

Hans Trabitzsch

Ursula Rausch

Helmut Daum

Ruediger Jelitte

Hans-Juergen Geyer

Gunther Schroder

Hans-Peter Boehm

Wilheim Gruber

Otto Watzenberger

Polyvinyl chloride surfaces receive a well-adhering, water and ethanol resistant coating with good plasticizer sealing effect by varnishing with an aqueous dispersion of (meth)acrylate polymers that are synthesized from 10 to 90% by weight acrylic and/or methacrylic acid alkyl or cycloalkyl esters with 1 to 10 carbon atoms in the ester group, 90 to 10% by weight acrylic and/or methacrylic acid esters with aromatic groups constituting or contained in the ester group, and small quantities of other monomers. The copolymers are preferably emulsion polymerized and may be synthesized as multiple-phase polymers according to the core-shell model.

Aqueous polyacrylate dispersion for coatings

Varnishing plastic surfaces with a clear or pigmented aqueous dispersion of a (meth)acrylate copolymer of (a) 20 to 90% by weight of acrylic and/or methacrylic acid alkyl or cycloalkyl esters with 1 to 10 carbon atoms in the ester group; (b) 80 to 10% by weight of acrylic and/or methacrylic acid esters with aromatic groups as the ester group or containing aromatic groups in the ester group; and (c) optionally, small quantities of other monomers, results in the formation of a firmly adhering, water and alcohol resistant finish. The copolymers are preferably emulsion polymers and are synthesized as multiple-phase polymers according to the core-shell model.

Aqueous polyacrylate systems for varnishing plastic surfaces

The invention relates to the stabilization of the activity and/or the reactivation of molybdoheteropoly acid catalysts in vapor-phase oxidations, such as the oxidehydrogenation of isobutyric acid or its lower esters to methacrylic acid or its lower esters, by means of an oxidizing treatment of the catalyst in which compounds of catalyst constituents are added, at temperatures ranging from 200.degree. to 400.degree. C., with an oxygen-containing gas. The inventive activation measures can be carried out either during the catalytic vapor-phase reaction, such as oxihydrogenation in particular, or intermittently to alternate therewith, and optionally also physically separated in part from each other.

Method for the catalytic vapor phase oxydehydrogenation of isobutyric

A film-forming, self-crosslinking aqueous synthetic resin dispersion with reduced liberation of formaldehyde contains an emulsion polymer composed of

Aqueous synthetic resin dispersions

Catalysts containing molybdenum, vanadium, phosphorus, and oxygen, optionally together with one or more metal ions, as their active constituents, are preferably disposed on an inert carrier for the oxidative dehydrogenation of isobutyric acid or its lower esters to methacrylic acid or its lower esters.

Heteropolymolybdate catalysts and method for oxydehydrogenation

Methods for providing temporary protective coatings on mechanic objects by applying thereto an aqueous emulsion of a lipophilic poly(meth)acrylate polymer predominately including esters of alcohols having at least four carbon atoms and then removing said temporary coatings when desired with an organic solvent which, with the polymer dissolved therein, is conveniently disposed of by combustion.

Acrylic protective coatings

The inventive vehicle, or binder, for water based gloss paints contains, dispersed in a aqueous phase, particles of a multiphase emulsion polymer made up of

Binder for aqueous gloss paints

Catalysts having an improved long-term activity behavior in the oxydehydrogenation of, for example, isobutyric acid to methacrylic acid, are prepared from heteropolyacids of molybdenum or from their metal salt derivatives by the concurrent use of a water soluble organic compound which is of low volatility or is practically non-volatile, such as a polymer, followed by calcination of the preparation at 200.degree. C. to 400.degree. C. in the presence of oxygen.

Method for making heteropolyacid catalysts and catalysts made by the

Method for regenerating catalysts containing molybdenum, phosphorus, and vanadium in oxidic association and useful for the oxydehydrogenation of isobutyric acid or its lower esters to form methacrylic acid or its lower esters, by oxidizing the spent catalyst with an oxygen containing gas at temperatures from 200.degree. C. to 400.degree. C., suitably intermittently and in alternation with oxydehydrogenation.

Oxidative catalyst regeneration

Method for making alpha, beta-unsaturated carboxylic acid anhydrides by carbonylation of esters of acrylic acid or methacrylic acid in the presence of a catalyst system containing at least one noble metal from group VIII of the periodic table, for example rhodium, the reaction being carried out at 70.degree. C. to 350.degree. C. and at pressures from 1 to 500 bar in the presence of a halogen or of a halogen compound, and in particular of iodine or an iodine compound, as a promoter.

Method for making unsaturated aliphatic carboxylic acid anhydrides

A process for the preparation of (meth)acrylamidomethylphosphonic acid diesters of formula I:

Method of preparing N-methylphosphonic acid diesters of acrylic and

A process for the production of diesters of oxalic acid by oxidative carbonylation of alcohols with carbon monoxide and oxygen as oxidizer at pressures of 1 to 700 atmospheres and in a temperature range between 20.degree. and 250.degree. C. in a reaction phase containing the alcohol and, as catalyst, palladium and at least one metal halide in catalytically effective amounts, whereby a catalyst system is used which consists of palladium, at least one metal halide, and an activated carbon which has been pretreated before use by heating to 200.degree.-1,500.degree. C. in a gas atmosphere G, differing from air. The gas atmosphere G, differing from air, consists, preferably, of at least one of the gases (a) nitrogen; (b) nitrogen compounds, except those with nitrogen-oxygen bonds; or (c) carbon monoxide; and may optionally contain an accompanying gas.

Growing community of inventors

Langen, Germany

Klaus Langerbeins