| 摘要 |
A core/shell polymer is capable of increasing a composition's whiteness of opacity. The shell polymer has either a crystalline structure of a Tg of at least about 50 DEG C. The shell polymer comprises (i) at least one nonionic monomer selected from the group consisting of soft alkyl acrylate monomers, soft methacrylate ester monomers, and mixtures thereof, and (ii) at least one additional nonionic monomer. The core has a different composition than the composition of the shell and a Tg of at least about 50 DEG C. The core comprises alkenyl aromatic monomers. The core and shell polymers are homopolymers or copolymers.
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