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AssigneeAmerican Lecithin Company
InventorsMax Kronstein, Joseph Eichberg
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Coating compositions, such as, paints with mixed pigmentation containing pigment with widely different specific gravities, have the tendency to show in the pigment sedimentation a separation of the pigment components. Such separated components do not redisperse readily with the coating composition vehicle, upon shaking or mixing, to fully restore the initial color shades. The three factors of flotation, flocculation, and sedimentation cause the separation of the coating composition components. Plant phosphatides, which are referred to as lecithins, (and modified plant phosphatides) can be used as the only additive resulting in a joint sedimentation of the entire pigment mixture without separation of the pigment components from each other. As a result, on shaking or mixing, the entire pigmentation reenters the coating composition jointly, and the initial color shade of the coating composition is restored. The lecithin or modified lecithin is used in an amount between 3.2 to 8 percent based on the amount of pigment.
The process of overcoming in a coating composition that includes a fluid vehicle which is compounded with a mixture of powdered or granular solid pigment components, said solid pigment components having different specific gravities, the tendency of said solid pigment components, upon storage, to separate from each other in accordance to their specific gravity, which comprises incorporating lecithin or a modification thereof, said modification having been obtained by hydroxylating or bleaching lecithin, into said coating composition containing said solid pigment components in an amount effective to significantly improve the storage stability of said solid pigment components in said coating composition, said effective amount of said lecithin, of said modification thereof, being 5.5 percent by weight, or more, based on the weight of said solid pigment components, said effective amount being more than the amount of said lecithin, or said modification thereof, required for the optimum wetting and dispersion of said solid components in said coating composition and said coating composition returns to the original color and state said coating composition originally had upon mixing or shaking of said coating composition after a storage period.
The coating composition that comprises a fluid vehicle which is compounded with a mixture of powdered or granular solid pigment components, and contains lecithin, or a modification thereof, said modification having been obtained by hydroxylation or bleaching lecithin, said lecithin, or said modification thereof, being present in an amount effective to significantly improve the storage stability of said pigments components, said effective amount, of said lecithin, or said modification thereof, being 5.5 percent by weight, or more, based on the weight of said solid pigment components, said effective amount of said lecithin, or said modification thereof, being more than the amount of said lecithin or said modification thereof, required for the optimum wetting and dispersion of said solid pigment components in said coating in said coating composition, said solid pigment components having different specific gravities, the tendency of said solid pigment components, upon storage, to separate from each other in accordance to their specific gravity, and said coating composition returns to the original color and state said coating composition originally had upon mixing or shaking of said coating composition after a storage period.
Dependencies are inferred from the claim text.