Copolymers suitable for plasticizing inorganic binder systems
AssigneeConstruction Research & Technology GmbH
InventorsAlexander KRAUS, Maxim PULKIN, Tatiana MITKINA
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Abstract
The present invention relates to copolymers that comprise salicylic acid derivative structural units and structural units having free polyether side chains. The copolymers are suitable to plasticize inorganic binder systems, construction chemical compositions comprising said copolymers and the use of said copolymers as a plasticizer for inorganic binder systems. Binder systems with a reduced amount of Portland cement comprising at least one copolymer of the invention provide a better liquefaction and processability as compared to said binder systems without a copolymer of the invention.
Claims19
A copolymer comprising structural units of formula (I)
- wherein
- R30, R31 and R32 independently of each other represent a hydrogen atom, an alkyl group with 1 to 6 carbon atoms or COOM;
- X is NH, N(C1-C4 alkyl) or O;
- R33 is OH, NR34R35, COOM, COOR34, SO3M, SO3R34, NO2, C1-C6 alkoxy or C1-C6 alkyl;
- R34 and R35 independently of each other represent H, C1-C6 alkyl, phenyl, C1-C6 alkyl-phenyl or phenyl-C1-C6 alkyl;
- t is 0, 1, 2, or 3;
- x is 0 or 1;
- n is 1, 2 or 3;
- y is 0 or 1;
- z is 0 or 1;
- and
- M is H or a cation equivalent;
- and
- structural units having free polyether side chains.
Dependencies are inferred from the claim text.