Patent ID: 6524435
Filing Date: 2003-02-25
Classification: C08G,C08L,D21C,D21H

Abstract:
A method of dispersing hydrophobic particles in a papermaking slurry containing fiber, said method consisting essentially of adding to the slurry about 0.05 to about 1 weight percent, based on weight of dry fiber, of an ethylene oxide-propylene oxide block copolymer, wherein the copolymer has a molecular weight of from about 1,000 to about 50,000 and a HLB of from about 1 to about 4, and wherein the ethylene oxide-propylene oxide block copolymer has formula (1) or (2) wherein a-f are independently integers of from 1 to about 1000 such that the EO/PO block copolymer has a molecular weight of from about 1,000 to about 50,000.