US 4,710,526 A · Alkaline curing emulsions for use in cement admixtures

Abstract

A cement admixture which results in a cement mortar with excellent adhesion to various adherents and with excellent flexibility over a wide range of temperatures, including very low temperatures, contains cement, optionally but preferably sand, and an effective amount of an aqueous emulsion of a cationic acrylate polymer having a Tg between below 10.degree. C. and -40.degree. C. The polymer comprises (a) about 25 to 85% of an acrylate monomer (e.g., butyl acrylate, methylmethacrylate, or 2-ethylhexyl acrylate but not methyl or ethyl acrylate), (b) about 0.5-15% of an alkaline-curable cationic quaternary ammonium salt monomer, and optional monomer(s) other than (a) or (b). The alkaline-curable cationic quaternary ammonium salt units in the polymer are represented by the formula ##STR1## where R is hydrogen or a methyl group; R.sup.2 and R.sup.3 may be the same or different and are a methyl or ethyl group: A is --O-- or --NH--; X is chlorine, bromine, or iodine; Y is an organic or inorganic monovalent anion; and n is 2 or 3.

Claims18

Dependent claims

A cement admixture comprising a cement and an effective amount of an aqueous emulsion of an acrylate polymer with a Tg between below 10.degree. C. and -40.degree. C., the polymer comprising (a) about 25-85% of an acrylate or methacrylate monomer, (b) about 0.5-15% of an alkaline-curable cationic quarternary ammonium salt monomer, (c) 0-70% of a hydrolytically-stable monomer other an (a) or (b), and (d) 0-30% of a hydrolytically-unstable monomer other than (a) or (b) with the percentages being by weight and totaling 100%;

wherein the acrylate unit in the polymer and has the formula ##STR7## and the alkaline-curable cationic quarternary ammonium unit in the polymer has the formula ##STR8## where R is hydrogen or a methyl group;
R.sup.1 is a C.sub.1 -C.sub.12 alkyl group or a C.sub.6 -C.sub.12 cycloalkyl group with the proviso that R.sup.1 is not a methyl or ethyl group when R is hydrogen;
R.sub.2 and R.sub.3 are methyl or ethyl groups and R.sup.2 and R.sup.3 may be the same or different;
A is --O-- or --NH--;
X is chlorine, bromine or iodine;
Y.sup.- represents an organic or inorganic anion;
and n is 2 or 3.

4 more elements

A method for improving the adhesion and flexibility of a cement admixture which comprises the step of adding to the cement an aqueous emulsion of an acrylate polymer with a Tg between below 10.degree. C. and -40.degree. C., the polymer comprising (a) about 25-85% of an acrylate or methacrylate monomer, (b) about 0.5-15% of an alkaline-curable cationic quarternary ammonium salt monomer, (c) 0-70% of a hydrolytically-stable monomer other than (a) or (b), and (d) 0-30% of a hydrolytically-unstable other than (a) or (b), with the percentages being by weight and totaling 100%;

wherein the acrylate unit in the polymer and has the formula ##STR9## and the alkaline-curable cationic quaternary ammonium unit in the polymer has the formula ##STR10## where R is hydrogen or a methyl group;
R.sup.1 is a C.sub.1 -C.sub.12 alkyl group or a C.sub.6 -C.sub.12 cycloalkyl group with the proviso that R.sup.1 is not a methyl or ethyl group when R is hydrogen;
R.sup.2 and R.sup.3 are methyl or ethyl groups and R.sup.2 and R.sup.3 may be the same or different;
A is --O-- or --NH;
X is chlorine, bromine or iodine;
Y.sup.- represents an organic anion;
and n is 2 or 3;
the aqueous emulsion being added in an amount sufficient to provide about 1-200% by weight of polymer solids based on the cement solids.

5 more elements

Dependencies are inferred from the claim text.

Alkaline curing emulsions for use in cement admixtures

Life of this patent

Alkaline curing emulsions for use in cement admixtures

Life of this patent

Abstract

Claims18