| abstract |
A triggered response composition comprising: one or morenpolyelectrolytes in contact with an aqueous system that is stable andninsoluble in an aqueous system at relatively high ionic strengthnequivalent to 0.5M sodium chloride or higher or base concentration ofnbetween 1.0 M to 2.5 M or higher and that disperses, disintegrates,ndissolves, destabilizes, swells, or combinations thereof, wherein thenchemical/physical response of the composition is triggered upon one ornmore ionic strength or base strength changes to the aqueous system;nwherein the polyelectrolyte is one or more alkali soluble polymersncomprising: (a) 5-70 weight percent of acidic monomers selected fromnmethacrylic acid, 2-methylpropionic acid or acrylic acid; (b) 30-95nweight percent of one or more non-ionic vinyl monomers selected fromnbutyl acrylate, styrene and methyl methacrylate and optionally, (c) 0.01nto 5 weight percent of one or more metal cross-linking agents. |