Water-soluble copolymers of vinylacetate and maleamic acids and use as fluidizers high-range water-reducers for aqueous suspensions
AssigneeSika AG, vorm. Kaspar Winkler & Co.
InventorsUeli Sulser, Anna Huber, J urg Widmer
Life of this patent
Estimating the term…
Abstract
Novel water-soluble linear copolymers of vinylacetate with monomeric addition products of amines, amino acids, amino groups containing aromatic sulfonic acids, amino alcohols of maleic anthydride. The copolymers are useful as fluidizers in water containing solid matter suspensions.
Claims17
A dispersing agent or fluidizer for aqueous suspensions of an effective dispersing or fluidizing amount of a substantially water soluble linear copolymer of monomeric units selected from vinyl acetate and vinyl alcohol with monomeric units of N-substituted maleamic acids in a molar ratio of 1:1, said copolymer represented by Formula (A) ##STR18## wherein R.sup.1 is hydrogen, R.sup.2 is an unsubstituted C1 to C4-alkyl residue, a C1 to C10-alkyl residue which comprises an alkali metal carboxylate or alkaline earth metal carboxylate group, or a hydroxy or amino group, an aromatic residue which comprises carboxylic acid or sulfonic acid groups or alkali metal carboxylate or sulfonate or alkaline earth metal carboxylate or sulfonate groups, or may together with the nitrogen atom to which they bond, form a morpholine ring;
- X represents a hydrogen atom or the group--COCH.sub.3 ;
- and M represents a hydrogen atom, a monovalent or divalent metal ion, or a substituted or unsubstituted ammonium group.
An aqueous suspension comprising (i) at least one member selected from the group of clays, porcelain, muds, chalk, talcum, carbon black, stone powders, pigments, silicates, gypsum plaster and hydraulic binders, and (ii) a dispersing or fluidizing amount of a substantially water soluble linear copolymer of monomeric units selected from vinyl acetate and vinyl alcohol with monomeric units of N-substituted maleamic acids in a molar ratio of 1:1, said copolymer represented by formula (A) as follows:
- ##STR19## wherein R.sub.1 represents hydrogen;
- R.sub.2 represents a C1 to C10-alkyl residue which may optionally comprise an alkali metal carboxylate or alkaline earth metal carboxylate group, or a hydroxy or amino group, an aromatic residue, a cycloaliphatic ring system which may optionally comprise carboxylic acid or sulfonic acid groups or alkali metal carboxylate or sulfonate or alkaline earth metal carboxylate or sulfonate groups, hydroxyethyl or hydroxy propyl groups, or may together with the nitrogen atom to which they bond, form a morpholine ring;
- X represents a hydrogen atom or the group --COCH.sub.3 ;
- and M represents hydrogen, a monovalent or divalent metal ion, or a substituted or unsubstituted ammonium group.
A dispersing agent or fluidizer for aqueous suspensions of an effective dispersing or fluidizing amount of a substantially water soluble linear copolymer of monomeric units selected from vinyl acetate and vinyl alcohol with monomeric units of N-substituted maleamic acids in a molar ratio of 1:1, said copolymer represented by Formula (A) ##STR20## wherein R.sup.1 is hydrogen, R.sup.2 is a C1 to C4-alkyl residue which comprises an alkali metal carboxylate or alkaline earth metal carboxylate group, or a hydroxy or amino group, an aromatic residue which comprises carboxylic acid or sulfonic acid groups or alkali metal carboxylate or sulfonate or alkaline earth metal carboxylate or sulfonate groups, or may together with the nitrogen atom to which they bond, form a morpholine ring;
- X represents a hydrogen atom or the group --COCH.sub.3 ;
- and M represents a hydrogen atom, a monovalent or divalent metal ion, or a substituted or unsubstituted ammonium group.
Dependencies are inferred from the claim text.