Patent ID: 9034968
Filing Date: 2015-05-19
Classification: C04B,C08K,C08L

Abstract:
1. A method for treating clay-bearing sand aggregates used in construction materials, comprising: introducing to clay-bearing sand aggregates, in an amount of 3% to 60% based on weight of clay treated, at least one copolymer obtained by copolymerizing monomer components (A), (B), and (C), as follows: (A) in an amount of 60-98 mol percent, a cationic monomer selected from quaternized vinyl pyridine and other cationic monomer represented by the following structures wherein R R R Z Y X represents a halide, pseudohalide, or sulfate; (B) in an amount of 2-40 mol percent, a hydrophobic, essentially water-insoluble monomer selected from the group consisting of vinyl acetate, styrene and its derivatives, vinyl ethers of formula CH (C) in an amount of greater than 1 and no greater than 20 mol percent, a water-soluble monomer selected from the group consisting of acrylamide, methacrylamide, alkyl acrylamide, dialkyl acrylamide, alkyl methacrylamide, dialkyl methacrylamide, polyalkyleneoxide acrylate, polyalkyleneoxide methacrylate, and polyalkyleneoxide ether.