Rohm and Haas Company

Thomas J Howell

William G Paterson

Ian Pattison

James Henry Barrett

George M Lein, Jr

An improved process for the manufacture of crosslinked copolymer particles from seed particles by imbibing a monomer therein and polymerizing the same under controlled suspension conditions wherein said improvement comprises expanding the seed in staged or sequential steps of feeding lower levels of crosslinking monomers in the early stages and preferably higher levels of crosslinking monomers at later stages of polymerization.

Process for producing an expanded seed copolymer and product therefrom

Hard, infusible, discrete beads of crosslinked copolymer are prepared by free-radical catalyzed polymerization of a monomer mixture in aqueous dispersion wherein a minor amount of a modifier, specifically an organic compound containing acetylenic or allylic unsaturation having the ability to moderate the rate of polymerization, is incorporated in the monomer mixture. Ion exchange resins having improved mechanical strength are obtained by attaching functional groups to the copolymer.

Ion exchange resins

A process for the manufacture of crosslinked ion exchange copolymer particles wherein small seed particles are swollen to final size by concurrently feeding monomer and polymerizing the same under controlled suspension conditions and the unique ion exchange particles produced thereby.

Copolymer process and product therefrom consisting of crosslinked seed

Ion exchange resins having improved physical stability and perfect bead count are prepared by a free-radical catalyzed polymerization of a monomer mixture utilizing certain peroxyester and peroxydicarbonate catalysts, followed by functionalizing the so prepared polymer.

Growing community of inventors

Langhorne, PA, United States of America

Thomas J Howell