Construction Research & Technology Gmbh

Mario Vierle

Gerhard Albrecht

Klaus Lorenz

Christian Scholz

Petra Wagner

Barbara Wimmer

Christoph Hesse

Luc Nicoleau

Silke Flakus

Michael Kutschera

Madalina Andreea Stefan

Hubert Leitner

Sabrina Montero Pancera

Christian Schwede

Dirk Schmitt

Siegfried Zuern

Eva Jetzlsperger

Thomas Wohlhaupter

Reinhard Dorfner

Michael Braeu

Daniel Fridrich

Helmut Mack

Martin Ernst

Manfred Bichler

Harald Grassl

Andreas Brodhagen

Torben Gädt

Martin Winklbauer

Torben Gaedt

Angelika Hartl

Uwe Gehrig

Frank Dierschke

Stefan Ingrisch

Maxim Pulkin

Tatiana Mitkina

Timo Mangel

Peter Schwesig

Volker Herzog

Michael Melchart

Klaus Arlt

Mathias Bauer

Siegfried Zürn

Günter Kaiser

Klaus Hartl

Michael Bräu

Michael BRÄU

Andreas Tselebidis

Tanja DÖRFLER

Stefan Thaler

Katja Neuer

Eva Scholz

Proposed is a polycondensation product comprising as monomer components at least one aryl polyoxyalkylene ether, at least one vicinally disubstituted aromatic compound, at least one aldehyde and also optionally further aromatic compounds; processes for preparing same, and also use thereof as dispersant for aqueous suspensions of inorganic binders and as grinding assistant for inorganic binders.

Polycondensation product based on aromatic compounds, method for the preparation and use thereof

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 method for producing a hydraulic binder, comprising contacting a composition comprising cement clinker, before, during or after the grinding procedure, with (a) a defoaming agent and (b) 0.0005% to 2% by weight, based on the total composition, of at least one air-introducing compound, the defoaming agent (a) comprising 0.0001% to 0.5% by weight, based on the total composition, of at least one defoaming agent of the formula R&#x2014;(CH&#x2014;O&#x2014;)&#x2014;(CH&#x2014;O&#x2014;)&#x2014;H and the ratio of (a) to (b) being between 1:1 to 1:200.

Process for manufacturing a hydraulic bonding agent, corresponding additive and its use

The invention concerns a process for the preparation of a hardening accelerator composition by reaction of a water-soluble calcium compound with a water-soluble silicate compound and by reaction of a calcium compound with a silicon dioxide containing component under alkaline conditions, in both cases the reaction being carried out in the presence of a polycondensate containing at least one structural unit consisting of an aromatic or heteroaromatic moiety bearing a polyether side chain and at least one structural unit consisting of an aromatic or heteroaromatic moiety bearing at least one phosphoric acid ester group and/or its salt. The invention concerns a composition of calcium silicate hydrate and the polycondensate, its use as hardening accelerator and for the reduction of the permeability of hardened compositions.

Hardening accelerator composition containing phosphated polycondensates

The invention relates to a polymer composition containing 5 to 95% by weight of a copolymer H and 2 to 60% by weight of a copolymer K, the copolymers H and K each having polyether macromonomer structural units and acid monomer structural units, which are present in the copolymers H and K in each case in a molar ratio of 1:20 to 1:1, and at least 20 mol % of all structural units of the copolymer H and at least 25 mol % of all structural units of the copolymer K being present in each case in the form of acid monomer structural units, the polyether macromonomer structural units of the copolymer H having side chains containing in each case at least 5 ether oxygen atoms, the number of ether oxygen atoms per side chain of the polyether macromonomer structural units of the copolymer H varying in such a way that the corresponding frequency distribution diagram, in which the number of ether oxygen atoms per side chain of a polyether macromonomer structural unit is plotted along the abscissa and the associated frequency for the copolymer H is plotted along the ordinate, contains at least 2 maxima.

Dispersing agent containing copolymer mixture

The invention relates to a polymer composition containing 3 to 95% by weight of a copolymer H and 3 to 95% by weight of a copolymer K, the copolymers H and K each having polyether macromonomer structural units and acid monomer structural units, which are present in the copolymers H and K in each case in a molar ratio of 1:20 to 1:1, and at least 20 mol % of all structural units of the copolymer H and at least 25 mol % of all structural units of the copolymer K being present in each case in the form of acid monomer structural units, the polyether macromonomer structural units of the copolymers H and K having side chains containing in each case at least 5 ether oxygen atoms, the number of ether oxygen atoms per side chain of the polyether macromonomer structural units of the copolymers H and K varying in each case in such a way that the corresponding frequency distribution diagrams, in which the number of ether oxygen atoms per side chain of a polyether macromonomer structural unit is plotted in each case along the abscissae and the respectively associated frequencies for the copolymers H or K are plotted in each case along the ordinates, contain in each case at least 2 maxima whose abscissa values differ in each case by more than 7 ether oxygen atoms from one another, the frequency distribution diagrams of the copolymers H and K differing from one another in that the abscissa value of at least one maximum of the copolymer H differs in each case by more than 5 ether oxygen atoms from the abscissa values of all maxima of the copolymer K and/or that the arithmetic means of the ether oxygen atoms of the polyether macromonomer structural units of the copolymers H and K differ from one another by more than 5 ether oxygen atoms.

Dispersant comprising copolymer mixture

The invention concerns a process for the preparation of a hardening accelerator composition by reaction of a water-soluble calcium compound with a water-soluble silicate compound and a process for the preparation of a hardening accelerator composition by reaction of a calcium compound with a silicon dioxide containing component under alkaline conditions, in both cases the reaction of the water-soluble calcium compound with the water-soluble silicate compound being carried out in the presence of an aqueous solution which contains a water-soluble comb polymer suitable as a plasticizer for hydraulic binders. The invention concerns also a composition of calcium silicate hydrate and comb polymer, its use as hardening accelerator and for the reduction of the permeability of hardened compositions.

Plasticizer-containing hardening accelerator composition

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

A process for the preparation of a copolymer in semicontinuous operation in a polymerization apparatus, comprising a polymerization reactor connected to a metering device, acid monomer being initially taken in the metering device and polyether macromonomer, acid monomer and water in the polymerization reactor, acid monomer being metered from the metering device into the polymerization reactor, the metering of the acid monomer being effected with the proviso that at least 70 mol % of the acid monomer metered in altogether are metered in the course of 5 to 19 minutes at a metering rate that is constant or varies to a limited extent.

Semi continuously operated method for producing copolymers

The invention relates to a polymer composition containing 3 to 90% by weight of a copolymer H and 3 to 90% by weight of a copolymer K, the copolymers H and K each having polyether macromonomer structural units and acid monomer structural units, which are present in the copolymers H and K in each case in a molar ratio of 1:20 to 1:1, and at least 20 mol % of all structural units of the copolymer H and at least 25 mol % of all structural units of the copolymer K being present in each case in the form of acid monomer structural units, at least 60 mol % of the polyether macromonomer structural units of the copolymer H being represented by the isoprenol polyether derivative structural units and at least 60 mol % of the polyether macromonomer structural units of the copolymer K being represented by the vinyloxy polyether derivative structural units.

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Wasserburg, Germany

Mario Vierle