Styrene-butadiene interpolymer latex based cement additives

Claim 2

A cement additive consisting essentially of (1) a styrene-butadiene interpolymer latex, said latex containing up to about 60 parts by weight of interpolymer solids, and, based on 100 parts of said latex polymer solids; said styrene-butadiene interpolymer has a styrene to butadiene weight ratio of from about 30:70 to about 70:30; (2) from about 3 to about 10 parts by weight of a nonionic surfactant, (3) from about 0.3 to about 10 parts by weight of a polyelectrolyte having a number average molecular weight of less than about 3000 consisting essentially of about 3 parts by weight of methyl methacrylate and about 1 part by weight of a sulfoester of -methylene carboxylic acid or its salt having the formula R--CO.sub.2 --Q--SO.sub.3 M wherein the radical R is selected from the group consisting of vinyl and ---substituted vinyl, and the radical --Q-- is a divalent hydrocarbon radical having its valence bonds on a different carbon atom, and M is a cation, and (4) from about 0.1 to about 5 parts by weight of a polyorganosiloxane foam depressant.

Claim 3

The cement additive of claim 1 wherein said styrene-butadiene interpolymer contains up to about 10 parts by weight of acrylonitrile.

Claim 4

The cement additive of claim 2 wherein said styrene-butadiene interpolymer consists essentially of about 63 weight percent styrene, about 32 weight percent butadiene and about 5 weight percent acrylonitrile.

Claim 5

The cement additive of claim 3 wherein said nonionic surfactant is a di-butyl-phenoxynonaoxyethylene-ethanol.

Claim 6

The cement additive of claim 4 wherein said nonionic surfactant is di-t-butyl-phenoxynonaoxyethylene-ethanol.

Claim 7

The cement additive of claim 5 wherein said monomeric sulfoester of α-methylene carboxylic acid or its salt is 2-sulfoethyl methacrylate or the sodium salt thereof.

Claim 8

The cement additive of claim 6 wherein said polyorganosiloxane foam depressant is a condensation product of dimethyl silane diol.

Claim 9

A latex-modified portland cement composition comprising a mixture of portland cement and a cement additive comprising (1) a styrene-butadiene interpolymer latex containing up to about 60 parts by weight of interpolymer solids, said latex being present in an amount sufficient to provide from about 5 to about 25 parts by weight of latex polymer solids based on the weight of cement, and, based on 100 parts of said latex polymer solids; said styrene-butadiene interpolymer has a styrene to butadiene weight ratio of from about 30:70 to about 70:30; (2) from about 3 to about 10 parts by weight of a nonionic surfactant, (3) from about 0.3 to about 10 parts by weight of a polyelectrolyte having a number average molecular weight of less than about 3000 consisting essentially of about 3 parts by weight of methyl methacrylate and about 1 part by weight of a sulfoester of a -methylene carboxylic acid or its salt having the formula R--CO.sub.2 --Q--SO.sub.3 M wherein the radical R is selected from the group consisting of vinyl and -substituted vinyl, and the radical --Q-- is a divalent hydrocarbon radical having its valence bonds on a different carbon atom, and M is a cation, and (4) from about 0.1 to about 5 parts by weight of a polyorganosiloxane foam depressant.

Claim 10

A latex-modified portland cement composition comprising a mixture of portland cement and a cement additive comprising (1) a styrene-butadiene interpolymer latex containing up to about 60 parts by weight of interpolymer solids, said latex being present in an amount sufficient to provide from about 5 to about 25 parts by weight of latex polymer solids based on the weight of cement, and, based on 100 parts of said latex polymer solids; said styrene-butadiene interpolymer has a styrene to butadiene weight ratio of from about 30:70 to about 70:30; (2) from about 3 to about 10 parts by weight of a nonionic surfactant, (3) from about 0.3 to about 10 parts by weight of a polyelectrolyte having a number average molecular weight of less than about 3000 consisting essentially of about 3 parts by weight of methyl methacrylate and about 1 part by weight of a sulfoester of a -methylene carboxylic acid or its salt having the formula R--CO.sub.2 --Q--SO.sub.3 M wherein the radical R is selected from the group consisting of vinyl and -substituted vinyl, and the radical --Q-- is a divalent hydrocarbon radical having its valence bonds on a different carbon atom, and M is a cation, and (4) from about 0.1 to about 5 parts by weight of a polyorganosiloxane foam depressant.

Claim 11

The latex-modified portland cement composition of Claim 8 wherein said styrene-butadiene interpolymer contains up to about 10 parts by weight of acrylonitrile.

Claim 12

The latex-modified portland cement composition of claim 9 wherein said styrene-butadiene interpolymer consists essentially of about 63 weight percent styrene, about 32 weight percent butadiene and about 5 weight percent acrylonitrile.

Claim 13

The latex-modified portland cement composition of claim 10 wherein said nonionic surfactant is a di-butyl-phenoxynonaoxyethylene-ethanol.

Claim 14

The latex-modified portland cement composition of claim 11 wherein said nonionic surfactant is di-t-butyl-phenoxynonaoxyethylene-ethanol.

Claim 15

The latex-modified portland cement composition of claim 12 wherein said monomeric sulfoester of α-methylene carboxylic acid or its salt is 2-sulfoethyl methacrylate or the sodium salt thereof.

Claim 16

The latex-modified portland cement composition of claim 13 wherein said polyorganosiloxane foam depressant is a condensation product of dimethyl silane diol.