Hoechst Aktiengesellschaft

Siegfried Noetzel

Otto Mauz

Horst Jastrow

Edgar Fischer

Klaus Sauber

Walter Herwig

Bernhard Neumann

Rudolf Kern

Werner Lotz

Rudolf Uebe

The invention relates to crosslinked polymers based on polyvinyl acylate or polyvinyl alcohol and having crosslinking agent units which are derived from crosslinking agents of the general formulae ##STR1## These products, inter alia, are particularly hydrolysis-resistant and can have high crosslinking densities. The invention also relates to a process for preparing these polymers and to their use in chromatography and as carriers for biologically active substances.

Carrier bonded enzymes and a process for their preparation

Crosslinked polymers which are produced from monomers containing epoxide groups, crosslinking monomers and, where appropriate, other monoethylenically unsaturated monomers are composed of principally spherical porous particles and are very suitable as carrier materials for the immobilization of biologically active substances.

Crosslinked polymers and a process for their preparation

The invention relates to crosslinked polymers based on polyvinyl acylate or polyvinyl alcohol and having crosslinking agent units which are derived from crosslinking agents of the general formulae ##STR1## and/or ##STR2## These products, inter alia, are particularly hydrolysis-resistant and can have high crosslinking densities. The invention also relates to a process for preparing these polymers and to their use in chromatography and as carriers for biologically active substances.

N,N'-divinylalkylurea crosslinked polymers, a process for their

Crosslinked polymers which are produced from monomers containing glycerol carbonate groups, crosslinking monomers and, where appropriate, other monoethylenically unsaturated monomers are composed of principally spherical porous particles and are very suitable as carrier materials for the immobilization of biologically active substances.

Crosslinked polymers with carbonate ester groups, and a process for

The invention relates to bead polymers based on monomers of the formula ##STR1## in which X is hydrogen or methyl, R denotes an aliphatic hydrocarbon radical having 1 to 12 carbon atoms, and Y denotes OH or NH.sub.2, which have been prepared using a special dispersion stabilizer. They are particularly distinguished by high porosity and are very suitable as carrier materials for biologically active substances.

Macroporous bead polymers, a process for their preparation and their use

The invention relates to bead polymers based on vinylene carbonate which are distinguished, in particular, by high porosity and which are well suited as carrier materials for biologically active substances. The preparation of these bead polymers is carried out, according to the invention, in the presence of certain dispersion stabilizers.

Vinylene carbonate polymers, a process for their preparation and their

There are described expandable molding compositions of styrene polymers containing 1,2,3,4,5,6-hexabromohexene-1 or 1,2,3,4,5,6-hexabromohexene-3 or mixtures thereof as the flame-retarding agent, and showing a favorable combination of improved properties, especially high pre-foaming velocity, good welding, rapid mold-releasing and good flame-retardance.

Flame-retarding, expandable molding compositions of styrene polymers

There are disclosed novel flame-proofing agents for plastics, especially for homopolymers and copolymers of styrene and acrylonitrile. These agents are organic compounds containing bromine and one or two phosphinic acid groups. Besides the good flame-retarding properties these compounds have the advantage that they do not adversely affect the shrinking of foamed plastics.

Bromine-containing phosphinic acid esters and flame-resistant plastic

Bromine-containing phosphonic acid esters of the formula ##STR1## in which R represents a halogen-containing linear or branched aliphatic or cycloaliphatic hydrocarbon radical having from 1 to 8 carbon atoms and R' and R' are hydrogen, halogen or alkyl groups having from 1 to 4 carbon atoms which may be closed to form a ring and/or substituted by halogen, at least one substituent being a bromine atom, are suitable as flame retardants for plastic materials, especially polystyrene and styrene copolymers.

Bromine-containing cyclic phosphonic acid esters

There are disclosed novel flame retarding polyamide molding compositions containing, as the flameproofing agents, an amount of from 6 to 40, preferably 8 to 30 weight % of an alkali metal or a group II or III metal salt of a phosphinic or diphosphinic acid. The flameproofing agents are thermostable and do not adversely affect the polyamides during preparation and processing.

Flame retarding polyamide molding compositions

Bromine containing telomeric phosphonic acid esters of the formula ##STR1## which are used as flameproofing agent for the preparation of flame-repellent thermoplastic compositions.

Bromine containing telomeric phosphonic acid esters as flame retardant

The present invention relates to 1,2-dibromoethane phosphonic acid bis-(2,3-dibromopropyl) ester, to a method for preparing the same, and to moldable plastics materials with improved flame retarding characteristics containing 1,2-dibromoethane phosphonic acid bis-(2,3-dibromopropyl) ester as the flame proofing agent.

Process for preparing flame resistant plastics materials

The specification discloses flame retarding plastic materials which contain, as the flame retarding agent, a phosphinic, diphosphinic or tri-phosphinic acid derived from 2-alkyl-2,5-dioxo-1,2-oxaphospholane and an organic monoamine or diamine or triamine, respectively.

Flame retarding plastic materials

The specification discloses flame retarding plastic materials which contain, as the flame retarding agent, an alkali salt or a group II or III metal salt of a phosphinic, diphosphinic or tri-phosphinic acid derived from 2-alkyl-2,5-dioxo-1,2-oxophospholane and an organic monoamine or diamine or triamine, respectively.

Bromine-containing phosphonic acid esters of the formula ##EQU1## in which R represents a halogen-containing linear or branched aliphatic or cycloaliphatic hydrocarbon radical having from 1 to 8 carbon atoms and R' and R' are hydrogen, halogen or alkyl groups having from 1 to 4 carbon atoms which may be closed to form a ring and/or substituted by halogen, at least one substituent being a bromine atom, are suitable as flame retardants for plastic materials, especially polystyrene and styrene copolymers.

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Kelkheim, Germany

Siegfried Noetzel