Direct surface modification of pigments by plant phosphatides fo

Details Direct surface modification of pigments by plant phosphatides fo Direct surface modification of pigments by plant phosphatides fo

1977-04-07

1978-11-21

Griffin, Ronald W.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

106 15R, 106308Q, 106308R, 260 292E, 260 293, 260 37R, 260 38, 260 40R, C09D 354, C09D 364, C09D 502

Patent

active

041265912

ABSTRACT:
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 4 to 10 percent based on the amount of pigment. Advantageously, the lecithin material is directly applied to the pigment surfaces. In such an embodiment, as little as 0.5 percent of lecithin can be used.

REFERENCES:
patent: 2201064 (1940-05-01), Thurman
patent: 2465733 (1949-03-01), Levis
patent: 2839546 (1958-06-01), Davis
patent: 2997398 (1961-08-01), Kronstein et al.
patent: 4056494 (1977-11-01), Kronstein et al.
Alexander, Colloid Chemistry Theoretical and Applied, vol. VI, Reinhold Publishing Corp., N.Y., N.Y., 1946, pp. 263-267 and 316-320.

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