Alkyd dispersion, and a process for producing the same

A solvent-free continuous process for producing an aqueous alkyd dispersion comprising the steps of:

• providing one or more molten or liquid alkyds, wherein each said one or more molten or liquid alkyds has an acid number of less than 20 and a molecular weight (Mn) in the range of greater than 1000 Dalton;
• providing one or more surfactants;
• providing water;
• optionally providing one or more neutralizing agents;
• continuously emulsifying said one or more molten or liquid alkyds in the water in the presence of said one or more surfactants and optionally said one or more neutralizing agents;
• thereby producing a high internal phase emulsion;
• providing additional water;
• contacting said high internal phase emulsion with said additional water;
• thereby producing said aqueous alkyd dispersion, wherein said alkyd dispersion comprises from 40 to 70 percent by weight of said one or more alkyds, from less than 10 percent by weight of said one or more surfactants, wherein said dispersion has an average particle size diameter in the range of from 0.05 to 5 μm and a viscosity in the range of 100 to 10,000 cP.

A coating composition comprising an aqueous, high-solid, solvent-free alkyd dispersion comprising:

• from 40 to 70 percent by weight of one or more alkyds based on the total weight of the dispersion, wherein each said one or more alkyds has an acid value of less than 20 and a molecular weight (Mn) in the range of greater than 1000 Dalton;
• from less than 10 percent by weight of one or more surfactants, based on the total weight of the dispersion;
• and
• from 30 to 55 percent by weight of water, based on the total weight of the dispersion;
• wherein said dispersion has an average particle size diameter in the range of 0.05 to 5 μm, and
• wherein said dispersion has a viscosity in the range of 100 to 10,000 cP.