PEARLESCENT PIGMENT
First Claim
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2. A pigment according to claim 1 wherein the wetting agent is a nonionic surfactant having an HLB value in the range of 5 to 16.
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Abstract
The luster, compressibility and other cosmetically important properties of various pearlescent pigments are substantially improved by coating the surface of the pigment particles with a composition comprising a precipitated water-insoluble metal stearate and a surfactant.
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Citations
8 Claims
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2. A pigment according to claim 1 wherein the wetting agent is a nonionic surfactant having an HLB value in the range of 5 to 16.
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3. A pigment according to claim 1 wherein the surfactant is a polyoxyethylene derivative having an HLB value of about 10.
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4. A pigment according to claim 1 wherein the metal soap is an alkaline earth salt of a saturated fatty acid having 12-20 carbon atoms.
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5. Method for treating a pearlescent pigment selected from bismuth oxychloride platelets, mica platelets coated witH bismuth oxychloride and mica platelets coated with titanium dioxide, which comprises suspending the pigment in water;
- dispersing a water-soluble salt of a higher fatty acid in the suspension;
gradually adding to the said suspension an aqueous solution containing cations which form an insoluble soap;
adding to said suspension an aqueous dispersion of a water-insoluble surfactant; and
recovering the pearlescent pigment in the form of substantially dry free-flowing particles.
- dispersing a water-soluble salt of a higher fatty acid in the suspension;
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6. Method of claim 5 wherein the surfactant has an HLB value in the range of 5 to 16.
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7. Method of claim 5 wherein the surfactant is a polyoxyethylene derivative having an HLB value of about 10.
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8. Method of claim 5 wherein the soap is an alkaline earth salt of a saturated fatty acid having 12-20 carbon atoms.
Specification