Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...
Patent
1996-12-09
1999-02-23
Jones, Deborah
Compositions: coating or plastic
Materials or ingredients
Pigment, filler, or aggregate compositions, e.g., stone,...
106418, 106446, 106447, C04B 1420
Patent
active
058739343
DESCRIPTION:
BRIEF SUMMARY
DETAILED DESCRIPTION OF THE INVENTION
1. Field of the Invention
The present invention relates to a surface-treating agent for use in an inorganic powder, and a surface-treated platelet-shaped pigment which is surface-treated with the surface-treating agent. More specifically, the present invention relates to a surface-treated platelet-shaped pigment which can suppress formation of a hard cake in a paint or an ink owing to settling during storage, transportation, coating or printing, and which can provide a coated product or a printed product having an improved water resistance.
2. Background
Pigments in a paint or an ink and insoluble substances making up the paint are, after the production, separated by settling with time during storage, or are gradually retained in a dead space and separated during transportation of a pipe line in coating. As a result, the color is deviated from the initial color, or segregation occurs, making it impossible to conduct desired coating or printing. Further, when the kind of the paint or the ink is changed, the paint which has been retained in the dead space of the coating/printing line is mixed to give an adverse effect.
In order to prevent the separation by settling, generally, a dispersant has been added or a paint has been blended with an anti-settling agent in advance. For example, anti-settling agents described in "Manual of Paint Starting Materials", p. 188, "3.2.1.9. Prevention of Thickening and Settling, Prevention of Sagging", such as organic bentonite, amide wax, hydrogenated castor oil wax, metallic soap, polyethylene oxide and sulfate product of Kusumoto Kasei K.K.! and 371 F (trade name for a product of Hoechst AG); have been generally used. However, these anti-settling agents are not effective for any pigments and solids. The function and effect of the anti-settling agents vary depending on a combination of properties of the ingredients making up the paint or the ink, such as resins, solvents, pigments and dyes. Accordingly, the use of these anti-setting agents is limited. Besides, the anti-settling agent added acts not only on the effective site which is the surface of the solid, but is distributed throughout the system. Therefore, the anti-settling agent is consumed excessively, and the amount of the anti-settling agent tends to increase inadvantageously. Accordingly, development of a more effective anti-settling agent has been in demand.
Meanwhile, a pigment which has itself an anti-settling property, that is, a pigment having a surface that undergoes anti-settling treatment has been developed. Examples of the surface-treated pigment which is proposed on the basis of this idea include a pearl pigment which is coated with a polyester-polyurethane block copolymer having a tertiary amino group by a plasticizer, a solvent and a surface active agent (see Japanese Laid-Open Patent Application (Kokai) No. 63-46,266), a platelet-shaped pigment coated with polyacrylate or polymethacrylate (see Japanese Laid-Open Patent Application (Kokai) No. 5,171,058) and a flaky substance to which fibrous particles having a particle diameter of from 0.1 to 20.mu. are adhered by a binder (see Japanese Laid-Open Patent Application (Kokai) No. 5,186-707).
On the other hand, a pearl pigment obtained by coating a metallic oxide or a hydrated metallic oxide on a platelet-shaped substance and a platelet-shaped pigment based on a platelet-shaped metallic oxide have been generally used widely as pigments for a paint, an ink and plastics. However, using these platelet-shaped pigments as such in a paint, an ink or the like for outdoor use, for example, for automobiles poses a problem with respect to a weatherability. A technology in which the weatherability has been improved is disclosed in, for example, Japanese Patent Publication Nos. 55-4,147 and 6-43,565 and Japanese Laid-Open Patent Application (Kokai) No. 1-292,067. Nevertheless, the pigment having the improved weatherability is not said to have a satisfactory anti-settling effect which is a serious problem when the pigment is actua
REFERENCES:
patent: 4544415 (1985-10-01), Franz et al.
patent: 5035748 (1991-07-01), Burrow et al.
Horie Yoshifumi
Kunii Koshiro
Harding Amy M.
Jones Deborah
Merck Patent Gesellschaft mit beschrankter Haftung
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