Rohm Gmbh

Guenter Schroeder

Siegmund Besecke

Wolfgang Gaenzler

Klaus Kabs

Werner Ude

Wilhelm Gruber

Heinz-Juergen Hohage

Joachim Knebel

Winfried Wunderlich

Ralf Liebler

Hermann-Josef Siegert

Heinz Vetter

Werner Hoess

Peter J Arndt

Franz Wenzel

Fritz Schlosser

Roland Reiner

Manfred Brehm

Sigmund Besecke

Franz Schnierle

In a process for imidizing an alkyl methacrylate polymer by reaction with a nitrogen-containing imidizing agent, the formation of carboxyl and anhydride groups is suppressed when a portion of the imidizing agent is added only after the previously added imidizing agent has been reacted at least partially, and particularly when the reaction with the imidizing agent is terminated before the polymer has been completely imidized.

Method for imidizing an alkyl methacrylate polymer

High-temperature-resistant, thermoplastically processable polyarylene ethers with repeating structural units of the general formula ##STR1## wherein A represents 4,4'- or 4,4'-benzophenone units of the formula ##STR2## with z being 0 or 1, B represents 9,9-bis(4'-phenyl)fluorene units of the formula ##STR3## and C represents 2,2-bis(4-phenyl)propane units of the formula ##STR4## which are linked to one another in etherlike fashion through oxygen atoms, the composition of the polyarylene ethers being determined by m and n, the molar ratio of which ranges from 30:70 to 90:10, and wherein the sequence of the segments containing B or C may be random.

Thermoplastic polyarylene ethers

A method for making resinous phosphorus-containing polyarylene ethers of the structure ##STR1## wherein R taken alone is hydrogen or R  R taken together are a covalent single bond, oxygen, sulfur, or a sulfonyl, carbonyl, methylene or isopropylidene bridge;

Phosphorus-containing polyarlene ether

What is disclosed is a method for making an amide of acrylic acid or of methacrylic acid by the reaction of an alkyl ester of acrylic acid or of methacrylic acid with an amine at a temperature between 50.degree. C. and 180.degree. C., whereby the reaction with the amine is carried out in the presence of a catalytic amount of a compound of a metal of Group IVB of the periodic table of the elements or of a compound of lead, zinc, or tantalum.

Method of making methacrylamides

UV absorbing compounds, susceptible to free-radical polymerization, of the formula ##STR1## wherein R is alkyl having from 4 to 12 carbon atoms of which not more than 6 are present in a linear chain, and in particular 2-(2'-hydroxy-3'-methacrylamidomethyl-5'-tert-octylphenyl)benzotriazole, and polymers thereof.

UV-absorbing monomer and polymers thereof

What is disclosed is a continuous one-step method for the preparation of isobutyric acid or a lower alkyl ester thereof by the Koch synthesis, which method comprises reacting propylene, carbon monoxide, and water or a lower alcohol, in the gaseous and liquid phases, in the presence of hydrogen fluoride as a Koch catalyst, at a temperature between 80.degree. C. and 160.degree. C., at a dwell time of the liquid phase of less than 20 minutes, and with a high degree of backmixing, while maintaining the content of propylene in the reaction mixture at less than one percent by weight of the liquid phase, wherein all or part of the propylene, carbon monoxide, and water or lower alcohol can be replaced by binary addition compounds formed pairwise between these materials. In the alternative, isopropylformiate can be continuously rearranged in the presence of hydrogen fluoride to produce isobutyric acid.

Method for making isobutyric acid

What are disclosed are resinous polyarylene esters containing more than 1 percent by weight of phosphorus and having the formula--CO--A--CO--O--B--O.sub.n, wherein B is a bivalent aromatic group and A represents at least in part

Polyarylene esters containing phosphorus

What are disclosed are phosphorus-containing polyarylene esters,

What is disclosed is a method for making amides of the formula ##STR1## wherein R.sub.1 is hydrogen or methyl,

Preparation of carboxylic acid amides

What is disclosed is the method for making an N-substituted acrylamide or an N-substituted methacrylamide which comprises reacting an alkyl ester of acrylic acid or of methacrylic acid with an aliphatic amine or with an aromatic amine at a temperature between 50.degree. C. and 180.degree. C. in the presence of a catalytic amount of a dialkyl tin oxide.

Method for making N-substituted acrylamides and methacrylamides

What is disclosed is a foamable polymer composition comprising

Foamable polymer material

In the method of making a compound of the formula ##STR1## wherein X is carboxyl, a carboxylic acid ester group --COOR.sub.2, or cyano, by reaction of a compound of the formula CH.sub.3 CH.sub.2 X with methylal in the presence of a catalyst, the improvement wherein said catalyst is a catalyst system which consists essentially of (1) silicon dioxide dosed with a basic component and (2) a member selected from the group consisting of aluminum oxide and titanium dioxide.

Method for making methacrylic acid, its nitrile and its esters

What is disclosed is a method of making a foamed polyacrylimide or polymethacrylimide polymer which comprises free-radically polymerizing a mixture comprising

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Ober-Ramstadt, Germany

Guenter Schroeder