Titre : |
Novel composite latex particles for use in coatings |
Type de document : |
texte imprimé |
Auteurs : |
Gerald A. Vandezande, Auteur ; Alfred Rudin, Auteur |
Année de publication : |
1994 |
Article en page(s) : |
p. 99-108 |
Note générale : |
Bibliogr. |
Langues : |
Américain (ame) |
Catégories : |
Core-Shell Liants Polyacétate de vinyle Polyacrylate de butyle Polymérisation en émulsion Revêtements en phase aqueuse:Peinture en phase aqueuse
|
Index. décimale : |
667.9 Revêtements et enduits |
Résumé : |
A novel emulsion polymerization technique is described to produce core-shell latex particles comprising poly(vinyl acetate) cores inside vinyl-acrylic shells. In a variation, acrylic shells can be produced surrounding poly(vinyl acetate) or vinyl acrylic cores. The latexes can be produced at commercial solids levels, with controlled, monodisperse particle sizes. The coatings formed from such core-shell particles exhibit the properties expected of the shell polymers. Core monomers are less expensive than the shell monomers, resulting in significant savings in raw material costs. The technique described is an inverted core-shell process in which the second-stage polymer is engulfed by a previously formed first-stage material. In coatings formulations the less expensive second stage monomers are more hydrophilic than those used to make the first stage polymer. Nevertheless, an inverted core-shell morphology can be made thermodynamically stable by appropriate choices of copolymerizable surfactants in the first-stage copolymer and nonionic initiator for the second-stage polymer. The resulting anchoring groups stabilize the desired particle structure. |
Note de contenu : |
- INTRODUCTION : Heterogeneous latex production theory - Thermodynamics and kinetics of heterogeneous particle formation - Practical applications of theory - Present study
- EXPERIMENTAL : Latex preparation - Initial latexes - Vinyl acetate/butyl acrylate latex - MMA/butyl acrylate latex - Core-shell latexes - Cores with vinyl acetate/butylacrylates shells - Cores with MMA/butyl acrylate shells - Latex characterization |
Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18753 |
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 66, N° 828 (01/1994) . - p. 99-108