Two Stage Preparation for Structured Latexes

ASA structural latexes have been synthesized in a two stage seeded emulsion polymerization. In the first stage, partially crosslinked poly(n-butyl acrylate) and poly( -butyl acrylate-sfaf-2-ethylhexyl acrylate) rubber cores are synthesized. In the second stage, a hard styrene acrylonitrile copolymer (SAN) shell is grafted onto the rubber seeds (16). [Pg.333]

Characterization of the polymer indicates that an application of sodium dodecyl sulfonate as anionic surfactant and sodium persulfate as initiator for both stages leads to a hemisphere particle [Pg.333]

In contrast, raspberry and core shell structures are formed when in both stages a non ionic surfactant, i.e., nonylphenol ethoxylated poly(ethylene glycol) and sodium persulfate are used. [Pg.334]