Foamed Particles
Foamed or vesiculated polymer particles are used in paint and coatings replacing titanium dioxide pigments, expensive extenders, emulsion polymers and open time modifiers such as glycols and humectants with improved opacity, whiteness, scrub resistance, water resistance and special faux finish effects. Cross-linked multi-vesiculated polyester particles consist of spherical hollow particles with multiple air voids. Such particles are formed by emulsion polymerization in which a first emulsion of an aqueous phase with a dispersed pigment is mixed with an unsaturated polyester and a co-polymerisable monomer. The mixture is emulsified at high shear into an aqueous phase to form a water-in-oil-in-water emulsion having the oil phase as globules of polyester/monomer each containing a number of vesicles of the initial aqueous phase. A polymerising initiator is added to initiate crosslinking to form the desired vesiculated beads. The result is a cross-linked polyester spherical particle with multiple air voids that hinder the re-entry and re-absorption of water when the cross-linked particles are dry. (Engelbrecht et al, Us Patent 7,572,846, 8/11/2009)
Recent US Patents
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Review Articles
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Editor's Notes
As the literature is reviewed, and items of interest concerning this topic are found. These may be added in an abbreviated form with the reference. Readers and contributors are invited to add their own notes. Contributors may add them directly and other readers can simply send their notes to the editor, Roger Corneliussen at rcorneliussen@4spe.org. He may edit and add them to this page at his discretion.