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US 6,545,067 B1Granted
Additives for mineral building materials containing cement
AssigneeBASF SE
InventorsKarl-Heinz Büchner, Michael Ehle, Johannes Perner, Knut Oppenländer, Markus Hartmann, Wolfgang Günther, Matthias Kroner
Life of this patent
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Abstract
Mixtures of at least one polycarboxylate-based plasticizer for cement-comprising mineral building materials, and butoxylated polyalkylenepolyamines or their salts as air detrainers, and the use of such mixtures as additives for mineral building materials comprising cement, are described.
Claims12
A mixture, comprising:
- at least one polycarboxylate-based plasticizer and, as an air detrainer, butoxylated polyalkylenepolyamines or salts thereof mixed with a mineral building material comprising cement.
An aqueous solution comprising a mixture of
- (a) a water-soluble copolymer containing from 98 to 2% by weight of units of esters of formula (I)
- 574/98 KS/mm 17.09.1998 in which R1 and R2 are identical or different and are H or CH3, A is an alkylene group with 2 to 4 carbon atoms, R3 is H or C1-C22-alkyl, and n is from 1 to 300, and from 2 to 98% by weight of units of acrylic acid, methacrylic acid, their alkali metal salts and ammonium salts, and mixtures thereof, and
- (b) butoxylated polyalkylenepolyamines or their water-soluble salts, said mixture containing from 0.3 to 30 parts by weight of component (b) per 100 parts by weight of component (a) and the concentration of component (a) in the aqueous solution being from 5 to 80% by weight.
Dependencies are inferred from the claim text.