Light-scattering compositions
A technology of composition and light scattering, applied in the direction of transportation and packaging, coating, electric solid devices, etc.
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Embodiment 1
[0055] This example illustrates the preparation of crosslinked polymer particles with a diameter of 0.25 microns for the preparation of large seed particles in aqueous dispersion. The mixture of Table 1 was prepared with deionized water:
[0056] Table 1
[0057] mixture
[0058] Add mixture A to a reactor equipped with a stirrer and condenser and protected with nitrogen, and heat to 83°C. To the reactor charge was added 10% of emulsified mixture B and 25% of mixture C. The temperature was maintained at 83°C and the mixture was stirred for 60 minutes, then the remainder of Mixture B and Mixture C were added to the reactor with stirring over a period of 120 minutes. Stirring was continued at 83°C for 90 minutes, after which time the reactor contents were cooled to room temperature. Measured with a Brookhaven Instruments particle size analyzer BI-90 (Brookhaven Instruments particle size analyzer BI-90), the particle size of the obtained particles is 0.25 microns.
Embodiment 2
[0060] In this example, the particles in the emulsion of Example 1 were grown to a diameter of 0.56 microns using n-butyl acrylate, styrene, and 1-hexanethiol. The mixtures shown in Table 2 were prepared using deionized water:
[0061] Table 2
[0062] mixture
[0063] Mixture A was added to the reactor of Example 1 and heated to 88°C with stirring. The air in the reactor was replaced with nitrogen. When the temperature of the reactor stabilized to 88°C, Mixture B was added to the reactor. The emulsified mixtures C and D and mixture E were then added to the reactor over a period of 300 minutes with stirring. Stirring was continued at 88°C for 90 minutes. The contents of the reactor were cooled to 65°C. Mixtures F and G were added and the reactor contents were maintained at 65°C for 1 hour with stirring, then the reactor contents were cooled to room temperature. Measured with a Brookhaven Instruments particle size analyzer BI-90 (Brookhaven Instruments particle ...
Embodiment 3
[0065] In this example, a procedure similar to Example 1 was used to prepare crosslinked polymer particles in an aqueous emulsion comprising 99.30 parts of n-butyl acrylate and 0.70 parts of allyl methacrylate. The resulting emulsion had a solids content of 32.52% and a particle size of 0.054 microns.
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