Patents Update

Microstructured effect pigments from Merck

Patent No. U.S. 7,264,670 B2

Merck has obtained a patent for a colored flake-form effect pigment comprised of one or more layers, where at least one of the layers comprises one or more colorants or is itself a colorant and at least one of the layers has a groove or grid structure, wherein the groove or grid structure has 250-2000 nm separations between adjacent grooves or grids.

SURFACE ENHANCING COATING
FOR GYPSUM-CONTAINING
FLOOR UNDERLAYMENTS

Patent No. U.S. 7,276,549 B2

United States Gypsum Company has been granted a patent for a mixture for use with water as a coating

between an adhesive and a floor underlayment made with calcined gypsum. The mixture is comprised of approximately 10-50% by weight based on the mixture of a redis-persible, latex polymer; from approximately 50-90% by weight based on the mixture of a surface enhancing agent, the surface enhancing agent selected to function as both a set accelerator for calcined gypsum and also as a cross-linking agent for the adhesive and selected from the group consisting of potassium sulfate, zinc sulfate, sodium sulfate, magnesium sulfate, copper sulfate, ferrous sulfate, ferric sulfate and aluminum sulfate; and from approximately 0.15-0.25% by weight based

on the mixture of a defoamer.

TITANIUM DIOXIDE PIGMENT
WITH IMPROVED LIGHT STABILITY
Patent No. U.S. 7,285,162 B2

Millennium Inorganic Chemicals, Inc. has received a patent for a coated titanium dioxide pigment having improved light stability comprised of a base titanium dioxide particle coated with a phosphate surfactant compound, and substantially spherical shaped silica spacer particles having an average particle size range between approximately 5-50 nanometers, wherein the substantially spherical shaped spacer particles weigh between approximately 7-20% weight based on the titanium dioxide weight. CW

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