Evonik Roehm Gmbh

Roehm Gmbh Chemische Fabrik

Rohm Gmbh

Rohm Gmbh Chemische Fabrik

Röhm Gmbh & Co. Kg

Roehm Gmbh Chemische Fabrik Patentabteilung

Evonik Operations Gmbh

Evonik Rohm Gmbh

Volker Kerscher

Joachim Knebel

Wolfgang Klesse

Wilhelm Karnbrock

Werner Siol

Dieter Tessmer

Gerold Schmitt

Guido Protzmann

Klaus Gottmann

Ralf Merbach

Martina Bader

John Hirsh

Werner Ude

Bardo Schmitt

Patrik Hartmann

Wolfgang Scharnke

Rolf Neeb

Karl J Folsch

Manfred Brehm

Marita Kaufmann

Process for preparing (meth)acrylates of the formula (I)CH&#x2550;C(R)&#x2014;CO&#x2014;O&#x2014;R&#x2003;&#x2003;(I)in which Ris hydrogen or methyl andRis a saturated or unsaturated, linear or branched, aliphatic or cyclic alkyl radical having 6 to 22 carbon atoms, or a (C-C)-aryl-(C-C)-alkyl radical;by reacting a (meth)acrylate of the formula IICH&#x2550;C(R)&#x2014;CO&#x2014;OR&#x2003;&#x2003;(II)with an alcohol of the formula (III)HO&#x2014;R&#x2003;&#x2003;(III)in the presence of an amount of a suitable catalyst which catalyzes the reaction and of an amount of a phenolic polymerization inhibitor or a combination of two or more phenolic polymerization inhibitors which is sufficient to inhibit undesired polymerization;the reaction being undertaken with input or introduction into the reaction mixture resulting from the reaction of an amount of oxygen or of an oxygenous gas mixture sufficient to inhibit undesired polymerization, and the process is characterized in thatthe specific total oxygen input is less than or equal to 1.0 l/kg, measured in liters of oxygen per kilogram of (meth)acrylate of the formula (I), where the volume of oxygen introduced is calculated at a temperature of 25&#xb0; C. and a pressure of 101 325 pascal. The resulting (meth)acrylates can surprisingly be processed to particularly high molecular weight emulsion polymers which are, for example, outstandingly suitable for use as flow resistance reducers in mineral oil extraction.

Process for preparing (meth)acrylates

A novel process is described which allows N-isopropyl(meth)acrylamide to be obtained in high purity and yield in a simple manner, by reacting methacrylic anhydride with isopropylamine, optionally in a solvent.

Method for producing N-isopropyl(meth)acrylamide

Process for preparing (meth)acrylates of the formula (I)CH&#x2550;C(R)&#x2014;CO&#x2014;O&#x2014;R&#x2003;&#x2003;(I) The resulting (meth)acrylates can surprisingly be processed to particularly high molecular weight emulsion polymers which are, for example, outstandingly suitable for use as flow resistance reducers in mineral oil extraction.

The present invention relates to mixtures containing  The present invention further relates to processes for polymerizing these mixtures, the highly transparent polymers thus obtainable and to their use.

Highly transparent plastic for optical materials

A coating agent for producing scratch-resistant coatings on plastic articles, which comprises:

UV-curable scratch-resistant varnish having a thickener which becomes

Crosslinked polymers are prepared by reacting mutually reactive side groups, comprising reacting polymer chains containing carbonyl side groups, optionally protected, and 1,2- or 1,3-diol side groups, optionally protected, in the presence of an acid catalyst, thereby forming crosslinking bridges between polymer chains. Crosslinked polymers are also prepared in which polymer chains are bonded together by a low molecular weight crosslinking agent.

Method of crosslinking organic polymers

The invention relates to a thio(meth)acrylic acid bisester of formula I ##STR1## where R.sub.1 represents hydrogen or methyl;

Monomer for high refractive index plastics

The invention relates to a high refractive index plastic produced by reaction of an alkylthiol with a multiply unsaturated monomer, wherein said alkylthiol (A) has at least 2, and up to 20 carbon atoms in the alkyl group, and contains at least 2 thiol groups in the molecule, is reacted with an alkylpolythiol ester (B) having at least 2, and up to 24, preferably up to 12, carbon atoms in the alkyl group, which ester contains at least 2 thiol groups esterified with (meth)acrylic acid in the molecule, said reaction being under conditions of radical polymerization, with the limitation that the numerical ratio of the mercapto groups to the available double bonds is .ltoreq.1, preferably &lt;0.5.

High refractive index plastic base on an alkylthiol and an

A macronomer of Formula I: ##STR1## wherein R.sub.1 is hydrogen or methyl, X is a biradical, R.sub.2 is an alkyl group of 1-40 carbon atoms and n is such that the molecular weight of the macromonomer ranges from 500-100,000 Dalton is prepared by transesterifying a monomeric ester of Formula II ##STR2## where R.sub.3 represents an alkyl group with 1-8 C atoms, with a hydroxyl-group-terminated polyalkyl methacrylate of Formula III ##STR3## where X and R.sub.2 have the same meanings as above, and

Method of manufacturing polyalkyl methacrylate macromonomers, and use of

A method for making aromatic bisphenols such as 9,9-bis-(4-hydroxyphenyl)fluorene by reacting an aromatic ketone, for example a diaryl ketone or diaryl diketone, with a phenol in the present of an insoluble strongly acidic cationic ion exchange resin as an acidic condensation catalyst, which latter may be used in the presence of a co-catalyst containing sulfur.

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Reinheim, Germany

Volker Kerscher