Patent Number: 7,232,875

Title: Preparation of comb-branched polymers

Abstract: A comb-branched polymer is disclosed. The polymer comprises recurring units of an unsaturated carboxylic monomer, an oxypropylene-rich poly(oxyethylene-oxypropylene) macromonomer and an oxyethylene-rich poly(oxyethylene-oxypropylene) macromonomer. The comb-branched polymer can be used as a water reducing agent in cement. It gives significantly lower air entrainment in cement admixture.

Inventors: Liotta, Jr.; Frank J. (Downingtown, PA), Shawl; Edward T. (Wallingford, PA)

Assignee: Lyondell Chemical Technology, L.P.

International Classification: C08F 220/64 (20060101); C08F 118/02 (20060101)

Expiration Date: 2019-06-19 0:00:00