	US 7,482,405 B2
	Cement additive
Toshimi Matsumoto, Kanagawa (Japan); Sven Asmus, Shanghai (China); Gerhard Albrecht, Tacherting (Germany); Klaus Lorenz, Zangberg (Germany); Petra Wagner, Trostberg (Germany); and Christian Scholz, Trostberg (Germany)
Assigned to Construction Research & Technology GmbH, Trostberg (Germany)
Appl. No. 10/551,268 PCT Filed Mar. 05, 2004, PCT No. PCT/EP2004/002254 § 371(c)(1), (2), (4) Date Jun. 13, 2006, PCT Pub. No. WO2004/087602, PCT Pub. Date Oct. 14, 2004.
Claims priority of application No. 2003-100709 (JP), filed on Apr. 03, 2003.
Prior Publication US 2006/0247402 A1, Nov. 02, 2006
Int. Cl. C08L 35/00 (2006.01); C08L 33/02 (2006.01); C08L 33/08 (2006.01)

U.S. Cl. 525—207 [525/221; 525/222; 525/223; 525/227; 525/228; 525/231; 106/823]

15 Claims

1. A cement additive containing copolyrners comprising one or more constitutional units represented by formula A:

wherein

R₁is hydrogen, an alkyl group having 1 to 4 carbon atoms, an alkenyl group having 1 to 4 carbon atoms or an aryl group having 6 to 9 carbon atoms;

R₂is hydrogen or an alkyl group having 1 to 9 carbon atoms, an alkenyl group having 1 to 9 carbon atoms or an aryl group having 6 to 9 carbon atoms;

T is alkylene having 1 to 4 carbon atoms, wherein the alkylene may include straight-chain alkylene or branched alkylene or arylene having 6 to 9 carbon atoms;

n is 0 or 1;

S₁and S₂are, independently of one another, —OC_kH_2k— or —OCH₂CHR₃—, wherein k is 2 or 3, R₃is an alkyl group having 1 to 9 carbon atoms, an aryl group having 6 to 9 carbon atoms; and

6≤m₁+m₂≤25;

andone or more constitutional units represented by formula B:

wherein

R₄is hydrogen or a methyl group;

R₅is hydrogen or a group represented by COOY;

Y is hydrogen, an aliphatic hydrocarbon group having 1 to 8 carbon atoms, wherein the aliphatic hydrocarbon group may include straight-chain, branched, saturated or unsaturated groups, a cyclic hydrocarbon group having 3 to 8 carbon atoms, wherein the cyclic hydrocarbon group may include straight-chain, branched, saturated or unsaturated groups, a hydroxyalkyl group having 2 to 5 carbon atoms, wherein the hydroxyalkyl group may include branched groups, a hydroxyalkenyl group having 2 to 5 carbon atoms, alkali metal or alkaline earth metal, an ammonium group derived from alkylamine having 1 to 20 carbon atoms, alkanolarmine having 1 to 20 carbon atoms, cycloalkylamine having 5 to 8 carbon atoms, or arylamine having 6 to 14 carbon atoms;

A is oxygen or NR₆; and

R₆is hydrogen, an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, a sulfonyl group or a sulfanyl group; and

one or more constitutional units represented by formula C:

wherein

R₄is hydrogen or a methyl group;

R₅is hydrogen or a group represented by COOY;

A is oxygen or NR₆;

X is an aliphatic hydrocarbon group having 1 to 8 carbon atoms, wherein the aliphatic hydrocarbon group may include straight-chain, branched, saturated or unsaturated groups, a cyclic hydrocarbon group having 3 to 8 carbon atoms, wherein the cyclic hydrocarbon group may include straight-chain, branched, saturated or unsaturated groups, a hydroxyalkyl group having 2 to 5 carbon atoms, wherein the hydroxyalkyl group may include branched groups, a hydroxyalkenyl group having 2 to 5 carbon atoms, alkali metal or alkaline earth metal, an ammonium group derived from alkylamine having 1 to 20 carbon atoms, alkanolamine having 1 to 20 carbon atoms, cycloalkylamine having 5 to 8 carbon atoms, or arylamine having 6 to 14 carbon atoms;

and wherein the cement additive comprises copolymers wherein the mole ratio of the constitutional units A and C is 0.1≤A/C≤1 and the mole ratio of the constitutional units B and C is B/C≤1 and copolymers wherein the mole ratio of the constitutional units A and C is A/C>1 and the mole ratio of the constitutional units B and C is 1<B/C≤20.