Patent ID: 7550621
Filing Date: 2009-06-23
Classification: C07C,C08G

Abstract:
1. A process for sulfating oligomers and polymers comprising the steps of: a) sulfating an oligomer or polymer selected from polyamines having the formula (III): wherein: each R unit is selected from moieties of the formula each R the values of the indices w′, x′, and y′ are selected such that the polyamine has a backbone weight average molecular weight prior to modification of from 600 daltons to about 3000 daltons, and any mixture thereof; by the addition of sulfuric acid to make a sulfated oligomer and water mixture; b) optionally driving off the water from the sulfated oligomer or polymer and water mixture to make a dried sulfated oligomer or polymer mixture; c) neutralizing the sulfated oligomer or polymer mixture of step (a) or optionally the dried sulfated oligomer or polymer mixture of step (b) by mixing with neutralization agent.