Basf Se Corporation

Eric Casebolt

Paul J Harris

Michael J Drewery

Nicholas A Foley

Provided are multistage polymers that comprise (i) a first stage comprising a first copolymer having a first theoretical T, the first copolymer being derived from a soft ethylenically-unsaturated monomer, a phosphorus-containing monomer, and an acetoacetoxy monomer; and (ii) a second stage comprising a second polymer having a second theoretical T, the second polymer being derived from one or more hard ethylenically-unsaturated monomers. The multistage polymers can be in the form of multilayer particles that comprise (i) a first layer comprising the first copolymer; and (ii) a second layer surrounding at least a portion of the first layer comprising the second polymer. Also provided are aqueous compositions including one or more of the multistage polymers (or multilayer particles) described herein, as well as methods for making the multistage polymers (or multilayer particles) described herein.

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Fort Mill, SC, United States of America

Eric Casebolt