Polymer encapsulation of high aspect ratio materials and methods of making same
First Claim
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1. A method of preparing an encapsulated pigment composition via suspension polymerization, the encapsulated pigment composition comprising one or more substantially spherical-shaped beads, wherein the substantially spherical-shaped beads comprise one or more high aspect ratio particles encapsulated within an encapsulating material, the method comprising the steps of:
- dispersing high aspect ratio particles in at least one of a monomer or a polymer and a cross-linking agent to form a suspension mixture;
adding the suspension mixture to an aqueous mixture comprising a suspension agent;
heating and mixing the aqueous reaction mixture to encourage the formation of substantially spherical-shaped beads, wherein most of the substantially spherical-shaped beads encapsulate one or more high aspect ratio particles to an extent that the high aspect ratio particles will not become delaminated during processing;
quenching the aqueous reaction mixture after the substantially spherical-shaped beads are formed; and
collecting the substantially spherical-shaped beads.
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Abstract
A pigment contains one or more substantially spherical-shaped beads. Each substantially spherical-shaped bead includes one or more high aspect ratio particles encapsulated within an encapsulating material. Resinous compositions containing this pigment and a plastic, for example a polycarbonate, have a flowline-free colored, sparkling and/or metallescent appearance.
45 Citations
13 Claims
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1. A method of preparing an encapsulated pigment composition via suspension polymerization, the encapsulated pigment composition comprising one or more substantially spherical-shaped beads, wherein the substantially spherical-shaped beads comprise one or more high aspect ratio particles encapsulated within an encapsulating material, the method comprising the steps of:
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dispersing high aspect ratio particles in at least one of a monomer or a polymer and a cross-linking agent to form a suspension mixture; adding the suspension mixture to an aqueous mixture comprising a suspension agent; heating and mixing the aqueous reaction mixture to encourage the formation of substantially spherical-shaped beads, wherein most of the substantially spherical-shaped beads encapsulate one or more high aspect ratio particles to an extent that the high aspect ratio particles will not become delaminated during processing; quenching the aqueous reaction mixture after the substantially spherical-shaped beads are formed; and collecting the substantially spherical-shaped beads. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification