Property study of structured self-crosslinking acrylic latex binder: Effect of molar mass and particle design

Abstract

In the present contribution, the optimization of coating properties of structured self-crosslinking latexes based on keto-hydrazide crosslinking system by varying particle design and molar mass was investigated. Two series of latex particles of hard-core/soft-shell or soft-core/hard-shell design were synthesized with a predominant soft phase. In both series, molar mass of the soft phase was gradually reduced by isooctyl 3-mercaptopropionate included in the synthesis. The results show that desired coating properties can be tailored successfully by varying the molar mass and particle design. Better properties exhibited coatings drawdowned from latexes of soft-core/hard-shell particle design. A moderate reduction of molar mass of emulsion copolymers caused a significant improvement of adhesion and blocking resistence.