Patent Number: 6,251,996

Title: Gel-type copolymer bead and ion-exchange resins made therefrom

Abstract: Gel-type copolymer beads are described which are useful as ion exchange resins such as those used in the treatment of power plant condensate water. The subject copolymer beads possess an interpenetrating polymer network of at least two polymer components including: (i) a first polymer component derived from a first monomer mixture comprising a first monovinylidene monomer having a styrenic content less than about 50 molar percent and (ii) a second polymer component derived from a second monomer mixture comprising: a second monovinylidene monomer having a styrenic content greater than about 50 molar percent and a second crosslinking agent. The ratio of the molar percent crosslinking agent of the first polymer component to the second polymer component is less than about 0.7. Methods for making the subject beads and methods for their use as ion exchange resins for treating aqueous solutions are also provided.

Inventors: Stahlbush; James R. (Midland, MI), Foster; Kenneth L. (Midland, MI)

Assignee: The Dow Chemical Company

International Classification: B01J 39/20 (20060101); B01J 39/00 (20060101); B01J 39/04 (20060101); C02F 1/42 (20060101); C08F 008/00 (); C08L 045/00 (); C08L 033/04 (); C08L 033/06 ()

Expiration Date: 06/26/2018