Admixtures for cementitous compositions
AssigneeMBT Holding AG
InventorsBernhard Leikauf, Max Oppliger, Salvatore Valenti
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Abstract
The invention relates to a random styrene-maleic anhydride (SMA) copolymer in free acid or salt form wherein the copolymer has the following types and numbers of monomer units ##STR1## in which M is selected from hydrogen, a cation and a residue of a hydrophobic polyalkylene glycol or polysiloxane, R is the residue of methylpoly(ethylene)glycol of molecular weight (weight-average) 900-2000, x=0.35-0.75 and y=0.25-0.65. These copolymers are particularly useful as superplasticizers in cementitious compositions such as concretes and mortars.
Claims9
A random styrene-maleic anhydride (SMA) copolymer in free acid or salt form wherein the copolymer comprises the monomer units:
- ##STR6## in which:
- M is selected from hydrogen, a cation and a residue of a hydrophobic polyalkylene glycol or polysiloxane;
- R is the residue of methylpoly(ethylene)glycol of molecular weight (weight-average) 900-2000;
- x=0.35-0.75 and
- y=0.25-0.65.
Dependencies are inferred from the claim text.