Patent Title: HIGH SOLIDS, LOW VISCOSITY URETHANE-LINKAGE CONTAINING LATEX AND METHOD OF PRODUCTION THEREOF

 Number/Link: WO2015/195466

Applicant/Assignee: Arkema

Publication date: 23-12-2015

“Gist”: Simultaneous emulsion polymerization of acrylate, hydroxyacrylate and diisocyanate

Why it is interesting: According to this invention a low viscosity and high solid-content latex, containing urethane bonds, can be produced by emulsion polymerization of a diisocyanate  and a mixture of ethylenically unsaturated monomers some of which are isocyanate-reactive. In an example H12MDI is emulsified in water together with hydroxyethyl acrylate, a mixture of other acrylate monomers and an appropriate surfactant.  The emulsion is then polymerized using a peroxide. The resulting latex had a solid content of 52% at a visosity of 480 cP.  The latex is said to be especially useful for coatings with improved chemical resistance and toughness.

Hydroxyethyl acrylate