Basf Aktiengesellschaft

Gerhard Bauer

Kaspar Bott

Karl Haeberle

Sven Lawrenz

Oral Aydin

Robert Rupaner

Johannes Dobbelaar

Lothar Maempel

Franz-Josef Mueseler

Eckehardt Wistuba

Josef Neutzner

Roland Baumstark

Martin Meister

Reinhard B&auml;cher

J&uuml;rgen Nahstoll

J&uuml;rgen Hartmann

Norbert Goetz

Albrecht Harreus

Alfred Oftring

Gerhard Hoffmann

Karl-Heinz Schumacher

Hartwig Voss

Gerd Rehmer

Jochen Wild

Andreas Keller

Gregor Ley

Friedrich Seitz

Peter Keller

Chung-Ji Tschang

Horst Neuhauser

Ulrich Filges

J&uuml;rgen Schmidt-Th&uuml;mmes

Wolfgang Hubinger

Bradley Ronald Morrison

Albrecht Zosel

Beate Strecker

Hans-Joachim Fricke

Hans J Neumann

Wolfgang H&uuml;binger

Claudia Heibel

Werner Kirchner

Gerhard Schumacher

Axel Ferber

Christian-Ulrich Schmidt

Jurgen Nahstoll

Rainer Wunder

A process is described for reducing the residual monomer content in a liquid solution, mixture, melt, suspension or dispersion of a polymer by postpolymerization with addition of a redox initiator system at a reaction temperature appropriate to it and with an extremely short mixing time of the liquid system in the production reactor by metering&mdash;gradually, in portions or continuously&mdash;at least one of the redox initiator components required to initiate polymerization of the residual monomers over a period (metering time) which is from about 10 to 250 times the mixing time of the liquid system in said reactor.

Method for reducing residual monomers in liquid systems by adding an oxidation-reduction initiator system

A process is described for effectively reducing the residual monomer content of an aqueous polymer dispersion by aftertreatment at atmospheric pressure or above with an initiator system comprising a) a hydroperoxide, hydrogen peroxide or a peracid, and b) an &agr;-hydroxy carboxylic acid, such as tartaric acid, or with a salt thereof.

Method of reducing the content of residual monomers in aqueous polymer dispersions

A reactor for chemical reactions, especially polymerization reactions, and in particular a reactor for emulsion, suspension, solution, bulk and/or precipitation polymerizations, which has a stirring mechanism, incoming and outgoing lines and a removable lid, and where both the stirring mechanism and incoming and outgoing lines are installed on the reactor floor. The novel reactor is quick and easy to open and clean and permits simple and rapid changeover of the installed stirring elements.

Chemical reactor with stirrer and incoming and outgoing lines on the reactor floor

A polymer dispersion is prepared by free radical polymerization of an aqueous monomer emulsion by a process in which the monomer emulsion is prepared continuously at the rate of consumption.

Method for the production of a polymer dispersion by radical aqueous emulsion polymerization with a continuously produced aqueous monomer emulsion

At least one single-stage or multistage stirrer which produces not only a tangential flow component but also an axial flow field is used in a stirred-vessel reactor in connection with the preparation of polymers by liquid phase polymerization.

Use of a single-stage or multistage stirrer to prepare polymers

A process for deodorizing and subsequently cooling dispersions or liquids comprising

Process for cooling dispersions and liquids

Carbamoylhydroxylamines and polymer-containing solution or dispersion

Dispersion or solution crosslinkable at room temperature with

Salt-free aqueous solutions of bisaminoxyalkanes (I) are prepared by a process in which

Preparation of substantially salt-free aqueous solutions of

A compound of the formula ##STR1## where R.sup.1 and R.sup.2, independently of one another, are each C.sub.1 -C.sub.10 -alkyl, C.sub.1 -C.sub.10 -alkoxy, C.sub.5 -C.sub.10 --cycloalkyl or C.sub.5 -C.sub.10 -aryl, each of which may furthermore contain from 1 to 3 non-adjacent nitrogen, oxygen or sulfur atoms as hetero atoms in the carbon chain or carbon ring and may be substituted by 1 to 3 C.sub.1 -C.sub.4 -alkyl or C.sub.1 -C.sub.4 -alkoxy groups, R.sup.1 or R.sup.2 may be hydrogen or R.sup.1 and R.sup.2 together form a bridge of 2 to 14 carbon atoms, where some of the carbon atoms may furthermore be part of an aromatic ring system, A is an n-valent organic radical and n is an integer equal to or greater than 2.

.beta.-hydroxyoxime ethers and solutions or dispersions crosslinkable at

Copolymerizable oxime ethers of the general formula ##STR1## where A is a divalent linking member, R.sup.1 and R.sup.2 independently of one another are each C.sub.1 -C.sub.10 -alkyl, C.sub.1 -C.sub.10 -alkoxy, C.sub.5 -C.sub.10 -cycloalkyl or C.sub.5 -C.sub.10 -aryl, each of which may furthermore contain 1-3 nonadjacent nitrogen, oxygen or sulfur atoms as heteroatoms in the carbon chain or in the carbon ring and may be substituted by from one to three C.sub.1 -C.sub.4 -alkyl or C.sub.1 -C.sub.4 -alkoxy groups, R.sup.1 or R.sup.2 may be hydrogen or R.sup.1 and R.sup.2 together form a bridge of 3 to 14 carbon atoms, where some of the carbon atoms may furthermore be part of an aromatic ring, Z is an n-valent organic radical which contains a copolymerizable ethylenically unsaturated group and n is an integer of from 1 to 3.

Copolymerizable oxime ethers and copolymers containing them

The invention relates to hydroxylamine derivatives of the general formula ##STR1## in which A denotes a divalent connecting link, R.sup.1 can be a hydrogen atom or a C.sub.1 -C.sub.4 alkyl group, Z stands for an n-valent organic radical, which contains a copolymerizable ethylenically unsaturated group, and n is an integer from 1 to 3, and salts thereof and copolymers thereof.

Amino-oxy esters

Copolymers are composed of a) from 0.01 to 40% by weight of a copolymerized ethylenically unsaturated compound having at least one isocyanate group blocked with an oxime, b) from 30 to 99.99% by weight of at least one C.sub.1 -C.sub.20 -alkyl (meth)acrylate, one vinyl ester of carboxylic acids of 1 to 20 carbon atoms, one vinylaromatic of up to 20 carbon atoms, one ethylenically unsaturated nitrile of 3 to 6 carbon atoms, one vinyl halide or one nonaromatic hydrocarbon of 4 to 8 carbon atoms having at least 2 conjugated double bonds, c) from 0 to 30% by weight of at least one comonomer having at least one keto or aldehyde group and d) from 0 to 50% by weight of at least one further monomer.

Copolymers crosslinking at room temperature

Copolymerizable oxime ethers

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Weinheim, Germany

Gerhard Bauer