Merck patents PIGMENTS

February 8, 2010

Patent No. U.S. 7,479,323 B2
Merck Patent has obtained a patent for an encapsulated pigment comprised of an outer water-soluble shell. The shell is comprised of a water-soluble film former of polyvinyl alcohol (PVOH) encapsulating a core. The core is comprised of at least one effect pigment which is a pearlescent pigment or a multilayered pigment based on SiO2 flakes, glass flakes, or TiO2  flakes, and, optionally, one or more solvents and/or conventional additives.

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