Basf Se Corporation

Construction Research & Technology Gmbh

Christian Schwede

Aaron Flores-Figueroa

Faissal-Ali El-Toufaili

Mario Vierle

Dieter Hannu Boeckh

Christian Schade

Helmut B Witteler

Gerhard Albrecht

Rainer Dobrawa

Gledison Fonseca

Wolfgang Loth

Andreas Brodhagen

Michaela Shaun Heussler

Gerd Konrad

Volker Herzog

Günter Kaiser

Klaus Arlt

Michaela Heuβler

Markus Spittler

Matthias Kruck

Michaela HEUßLER

The present invention relates to a continuous process for the manufacture of highly-branched homo- or copolymers of C-Cethylenically unsaturated mono- or dicarboxylic acid as well as the anhydrides and salts thereof (monomer A) by means of free-radical polymerization of monomer A and optionally water-soluble, monethylenically unsaturated comonomers (monomer B) in an aqueous medium in the presence of at least one water-soluble initiator, wherein the polymerization takes place in at least one tubular reactor segment.

Continuous process for the manufacture of highly-branched polymers

The present invention relates to a process for the continuous preparation of polymers in a polymerization apparatus, where the starting materials comprise at least one olefinically unsaturated polyether macromonomer and at least one olefinically unsaturated acid monomer and at least one free-radical initiator and the polymerization is carried out at temperatures in the range from &#x2212;20 to +120&#xb0; C., wherein the polymerization apparatus comprises at least one loop reactor which has at least one feed line for the starting materials and at least one outlet, where the loop reactor comprises at least one reaction zone which comprises internal cooling and mixing elements and which has a volume-based heat removal power of at least 10 kW/m&#xb7;K. Furthermore, the use of the polymer of the invention as dispersant for hydraulic binders is disclosed.

Continuous process for preparing copolymers

The invention relates to a continuous process for the preparation of amphiphilic graft polymers, wherein a vinyl ester component (B) composed of vinyl acetate and/or vinyl propionate (B1) and, if desired, a further ethylenically unsaturated monomer (B2), is polymerized in the presence of a polyalkylene oxide (A), a free radical-forming initiator (C) and, if desired, an additive (D), at a mean polymerization temperature at which the initiator (C) has a decomposition half-time of from 1 to 500 min, in at least one tubular reactor segment with a feed side and an outlet side, through which the reaction mixture comprising at least a part of component (A) to (C), and if desired (D), streams, a tubular reactor segment and the use of the inventive amphiphilic graft polymer. The invention further relates to an inventive amphiphilic graft polymer and the use thereof.

Continuous process for the synthesis of graft polymers based on polyethers

The invention relates to a process for the preparation of copolymer in a continuous mode of operation in a polymerization apparatus, comprising a polymerization reactor having feed lines and an outflow, free radical polymerization initiator, an acid monomer and polyether macromonomer being passed as monomeric starting materials into the polymerization reactor through the feed lines, initiator, monomeric starting materials and copolymer-containing reaction composition thermostated at &#x2212;20 to +120&#xb0; C. being present in the polymerization reactor, copolymer-containing reaction composition being discharged from the polymerization reactor through the outflow, the introduction of the polyether macromonomer into the polymerization reactor being effected separately from the acid monomer in a manner such that the polyether macromonomer is mixed with the initiator, monomeric starting materials and copolymer-containing reaction composition in the polymerization reactor and comes into contact with the acid monomer for the first time thereby.

Continuously operated method for producing copolymers

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Weinheim, Germany

Christian Schwede