Patent ID: 9012574
Filing Date: 2015-04-21
Classification: C08F

Abstract:
1. A grad copolymer which exhibits pH dependent behavior, having a formula 1 comprises: a. a backbone having the formula [A(x)B(y)C(z)] comprising: a diol (A) selected from the group consisting of 1,2-ethane diol, 1,3-propane diol, 1,2-propane diol, 2-methyl-1,3-propane diol, 1,4-butane diol, 1,3-butane diol, 1,2-butane diol, 1,5-pentane diol, 1,6-hexane diol, 1,7-heptane diol, 1,8-octane diol, 1,9-nonane diol, 1,12-dodecane diol, 1,4-cyclohexanedimethanol and bis(2-hydroxyethyl)terephthalate, a dicarboxylic acid (B) selected from the group consisting of succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid and dodecanedioic acid or acid anhydride (B) selected from the group consisting of succinic anhydride and phthalic anhydride and an epoxy monomer (C) containing pendant unsaturation selected from the group consisting of glycidyl methacrylate and glycidyl acrylate or a diol monomer (C) containing pendant unsaturation selected from the group consisting of trimethylolpropane monomethacrylate and trimethylolpropane monoacrylate, wherein (x)=41-45%, (y)=49-53% (z)=4-7% by mole; and b. a graft which is a polymer of a vinyl pyridine monomer (D) and ‘w’ is a weight percent of the total weight of said graft copolymer such that ‘w’ is 22-52%.