Patent ID: 11884601
Assignee: SIKA TECHNOLOGY AG
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 8:
9. The cement based composition according to claim 1, wherein the polycarboxylate ether comprises:
a) a partial structural unit S1 of formula (I) in a mole fraction of a, b) a partial structural unit S2 of formula (II) in a mole fraction of b, where:
M independently from each other is H+, an alkali metal ion, alkaline earth metal ion, a di- or trivalent metal ion, an ammonium ion or an organic ammonium group;
each Ru independent from the others is hydrogen or a methyl group,
each Rv is hydrogen,
m=1 or 2,
p=0 or 1, and
R1 is -[AO]n—H, wherein A is a C2 to C4-alkylene, and n is from 20 to 150, and
the molar ratio a/b of the mole fraction a of the partial structural unit S1 to the mole fraction b of the partial structural unit S2 is in a range from 6/1 to 2.5/1, provided that a+b=1.