Abstract: The present invention relates to water-soluble modified lignins preparable by enzymatic reaction of at least one water-insoluble lignin with at least one organic compound which possesses at least one group selected from primary or secondary amino group, hydroxyl group and phenyl group and has an average molecular weight in the range from 75 to 2500 g/mol. The water-soluble modified lignins are preparable under mild conditions in a simple process. They can be used as dispersants for mineral binder compositions, where they act as plasticizers and in so doing prolong the setting time to much less of an extent than the water-insoluble lignins used in their preparation.

Abstract: The present invention relates to water-soluble modified lignins preparable by enzymatic reaction of at least one water-insoluble lignin with at least one organic compound which possesses at least one group selected from primary or secondary amino group, hydroxyl group and phenyl group and has an average molecular weight in the range from 75 to 2500 g/mol. The water-soluble modified lignins are preparable under mild conditions in a simple process. They can be used as dispersants for mineral binder compositions, where they act as plasticizers and in so doing prolong the setting time to much less of an extent than the water-insoluble lignins used in their preparation.

Abstract: A method for producing chemically modified lignin decomposition products. To this end, a lignin-containing starting material is decomposed into low-molecular and high-molecular lignin decomposition products under acid conditions in the presence of a liquid medium, and the low-molecular lignin decomposition products are at least largely separated in order to obtain a high-molecular fraction. Subsequently, the high-molecular lignin decomposition products present in the high-molecular fraction are converted into chemically modified lignin decomposition products. The chemically modified lignin decomposition products obtained in this way can be used, for example, as dispersing agents, complexing agents, phenol component, flocculant, thickener or auxiliary agents for cementous systems, coatings, paints or adhesives.

Abstract: A polymer (P) is disclosed which includes amide and ester groups. The polymer can be produced by a process whereby, in a first step, a homo- or co-polymer (P1) of (meth)acrylic acid is reacted with a monohydroxy compound (E) at a temperature of up to 200° C., such that, in addition to ester groups, anhydride groups are formed. In a second step, the anhydride groups formed in the first step are reacted with a monoamine compound (A) at temperatures significantly below 100° C. Polymers produced by the above method can be included in hydraulic-setting compositions before and after hardening by an addition of water.

Abstract: The invention relates to a method for the production of a polymer (P) comprising amide and ester groups, whereby, in a first step, a homo- or co-polymer (P1) of (meth)acrylic acid is reacted with a monohydroxy compound (E) at a temperature of up to 200° C., such that, in addition to ester groups, anhydride groups are formed and, in a second step, the anhydride groups formed in the first step are reacted with a monoamine compound (A) at temperatures significantly below 100° C. The invention further relates to polymers produced by the above method, the use thereof in hydraulic-setting compositions and said hydraulic-setting compositions before and after hardening by addition of water.

Abstract: The invention relates to polymers in a solid state which may be obtained by reaction of at least one polymer, produced from at least one monomer, selected from unsaturated mono- or di-carboxylic acids, or analogues of unsaturated mono- or di-carboxylic acids and optionally at least one ethylenically-unsaturated monomer with at least one polymer which is terminated at one end by terminal groups which are non-reactive under normal reaction conditions and hydroxy- or amino-functionalised at the other end thereof and, optionally, at least one amine.

Abstract: Described are polymers and cement admixtures which reduce drop in fluidity with time. Said admixture comprises at least one polymer of the present invention and at least one polymer A. The polymer of the present invention comprises side chains of which at least 10 weight-% can be cleaved in alkaline medium. The polymer of the present invention is an acrylic polymer which comprises side chains connected to the backbone by ester linkages. These side chains may be alkyl, hydroxy alkyl, cycloalkyl or polyoxyalkylene groups. Polymer A is a cement dispersing agent. The combination of polymer A with the polymer of the present invention in a weight ratio of 0.1:10-10:1, and preferably 1:10-10:1 reduces the drop in fluidity with time of cementitious compositions.

Abstract: The invention relates to a method for the production of a polymer (P) comprising amide and ester groups, whereby, in a first step, a homo- or co-polymer (P1) of (meth)acrylic acid is reacted with a monohydroxy compound (E) at a temperature of up to 200° C., such that, in addition to ester groups, anhydride groups are formed and, in a second step, the anhydride groups formed in the first step are reacted with a monoamine compound (A) at temperatures significantly below 100° C. The invention further relates to polymers produced by the above method, the use thereof in hydraulic-setting compositions and said hydraulic-setting compositions before and after hardening by addition of water.

Abstract: Described are polymers and cement admixtures which reduce drop in fluidity with time. Said admixture comprises at least one polymer of the present invention and at least one polymer A. The polymer of the present invention comprises side chains of which at least 10 weight-% can be cleaved in alkaline medium. The polymer of the present invention is an acrylic polymer which comprises side chains connected to the backbone by ester linkages. These side chains may be alkyl, hydroxy alkyl, cycloalkyl or polyoxyalkylene groups. Polymer A is a cement dispersing agent. The combination of polymer A with the polymer of the present invention in a weight ratio of 0.1:10-10:1, and preferably 1:10-10:1 reduces the drop in fluidity with time of cementitious compositions.

Abstract: Described are polymers and cement admixtures which reduce drop in fluidity with time. Said admixture comprises at least one polymer of the present invention and at least one polymer A. The polymer of the present invention comprises side chains of which at least 10 weight-% can be cleaved in alkaline medium. The polymer of the present invention is an acrylic polymer which comprises side chains connected to the backbone by ester linkages. These side chains may be alkyl, hydroxy alkyl, cycloalkyl or polyoxyalkylene groups. Polymer A is a cement dispersing agent. The combination of polymer A with the polymer of the present invention in a weight ratio of 0.1:10–10:1, and preferably 1:10–10:1 reduces the drop in fluidity with time of cementitious compositions.

Abstract: The invention relates to polymers in a solid state which may be obtained by reaction of at least one polymer, produced from at least one monomer, selected from unsaturated mono- or di-carboxylic acids, or analogues of unsaturated mono- or di-carboxylic acids and optionally at least one ethylenically-unsaturated monomer with at least one polymer which is terminated at one end by terminal groups which are non-reactive under normal reaction conditions and hydroxy- or amino-functionalised at the other end thereof and, optionally, at least one amine.

Abstract: Polymers for cement dispersing admixtures, which show different performing properties in concrete are described. All polymers are based on a composition of reactants, namely a) a poly(acrylic acid), b) a polyalkyleneglycol-monoalkylether and, optionally c) a ?-amino-polyalkylene-glycol-?-alkylether and/or d) a primary or secondary amine. By keeping the composition of reactants constant and varying only the reaction time, polymers with different properties can easily be achieved. Such polymers are suitable for pre-cast, readymix or for increasing workability over time, just depending on reaction time. Polymers of the invention can be used as single polymer or in polymer blends. For this, the kinetics of the used polymer analogous condensation reaction was intensively studied. Additionally, the benefit of amines as reactant regarding stability and hydrolysis velocity of cleavable side groups was investigated.

Abstract: Described are polymers and cement admixtures which reduce drop in fluidity with time. Said admixture comprises at least one polymer of the present invention and at least one polymer A. The polymer of the present invention comprises side chains of which at least 10 weight-% can be cleaved in alkaline medium. The polymer of the present invention is an acrylic polymer which comprises side chains connected to the backbone by ester linkages. These side chains may be alkyl, hydroxy alkyl, cycloalkyl or polyoxyalkylene groups. Polymer A is a cement dispersing agent. The combination of polymer A with the polymer of the present invention in a weight ratio of 0.1:10-10:1, and preferably 1:10-10:1 reduces the drop in fluidity with time of cementitious compositions.

Abstract: A multipurpose cement dispersing, shrinkage compensating and anticorrosive polymer and an admixture comprising said polymer, which improve the workability and the early strength development of fresh concrete, are described. Said polymer is an ester- and amid group-modified acrylic polymer, obtainable by aqueous solution radical copolymerization of (1) acrylic or methacrylic acid with (2) an acrylic or methacrylic methoxy-polyalkyleneglycolester monomer having 2 to 300 moles of an oxyalkylene group each having 2 to 3 carbon atoms, (3) optionally an acrylic or methacrylic methoxy-polyalkyleneglycolamide monomer having 2 to 300 moles of an oxyalkylene group each having 2 to 3 carbon atoms, (4) an acrylic or methacrylic ester of a tertiary aminoalkanol and (5) optionally an acrylic amide of a primary or secondary aliphatic, cycloaliphatic or aromatic amine.

Abstract: Described are polymers and cement admixtures which reduce drop in fluidity with time. Said admixture comprises at least one polymer of the present invention and at least one polymer A. The polymer of the present invention comprises side chains of which at least 10 weight-% can be cleaved in alkaline medium. The polymer of the present invention is an acrylic polymer which comprises side chains connected to the backbone by ester linkages. These side chains may be alkyl, hydroxy alkyl, cycloalkyl or polyoxyalkylene groups. Polymer A is a cement dispersing agent. The combination of polymer A with the polymer of the present invention in a weight ratio of 0.1:10-10:1, and preferably 1:10-10:1 reduces the drop in fluidity with time of cementitious compositions.

Abstract: Polymers for cement dispersing admixtures, which show different performing properties in concrete are described.

Abstract: A multipurpose cement dispersing, shrinkage compensating and anticorrosive polymer and an admixture comprising said polymer, which improve the workability and the early strength development of fresh concrete, are described.

Abstract: Novel water-soluble linear copolymers of N-vinylamides with monomeric addition products of amines, amino acids, amino groups containing aromatic sulfonic acids, amino alcohols of maleic anhydride as well as maleic esters of polyoxyalkyleneglycols or their monoethers. There is also described the process for the preparation of these copolymers. The copolymers are useful as fluidizers in water containing solid matter suspensions.