aminopropionic acid, 3-Aminobutyric acid, chloroacetic acid, chloropropionic acid, bromoacetic acid, bromopropionic acid and the like, and other amino acids and amino acid precursors such as epsilon aminocaproic acid, epsilon caprolactam, betalactams, gamma lactams and deltalactams where the resulting polymer after delayed reaction downhole is a carboxylic acid containing polymer.