Carboxy hydroxamic acid polymers and their use as detergent additives
AssigneeAmerican Cyanamid Company
InventorK. Robert Huffman
Life of this patent
Estimating the term…
Abstract
Polymeric carboxy hydroxamic acids useful as detergent additives are disclosed which are advantageously prepared from polyacrylic acid by first dehydrating the polyacrylic acid to form polyacrylic anhydride followed by reaction with a hydroxylamine compound.
Claims9
A method for the production of polyacrylic anhydride comprising reacting polyacrylic acid with an acyl compound of the formula R'C:OX, wherein R' represents an organic radical of 1 to 12 carbon atoms selected from the group consisting of straight or branched chain alkyl, aryl, alkaryl, aralkyl, or alkenyl radicals and X represents a halogen or an organic anhydride residue having the formula R'C:OO.sup.-, wherein R' is as defined above, said reaction being conducted in the absence of a catalyst.
A process for preparing polymeric carboxyl hydroxamic acids comprising
- (a) reacting polyacrylic acid with a compound of the formula R' represents an organic radical of 1 to 12 carbon atoms selected from the group consisting of straight for branched claim alkyl, aryl, alkaryl, aralkyl or alkenyl radicals and X represents a halogen atom or an organic anhydride residue having the formula R'C:OO.sup.-, wherein R' is as defined above, wherein said reaction being conducted in the absence of a catalyst and
- (b) reacting the resultant polymeric anhydride with a hydroxylamine compound of the formula HRNOH, wherein R represents hydrogen or C.sub. -C.sub.6 alkyl, cycloalkyl, or phenyl group.
A detergent composition with transition metal ion chelating activity comprising one or more detersive surfactants, and about 3% to about 12% by weight of the total composition of a polmer having randomly alternating repeating units consisting essentially of those the formulae ##STR4## wherein R represents hydrogen or C.sub.1 -C.sub.6 alkyl, cycloalkyl or a phenyl group.
Dependencies are inferred from the claim text.