Coloured organic electrophoretic particles
AssigneeBASF SE
InventorsGabriele Baisch, Reinhold Öhrlein, Peter Simmendinger, Gerardus De Keyzer, Margherita Fontana, Vilas N. Mumbaikar
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Abstract
The present invention relates to the preparation and use of (colored) organic particles carrying electric charge as electrophoretic (image) displaying particles, to electrophoretic dispersions comprising the organic particles carrying electric charge, electrophoretic (image) devices (especially displays) comprising the colored organic particles carrying electric charge, to the novel functionalized particles, and to their use. The particles are obtainable according to a method represented by the reaction scheme as given in FIG. 1.
Claims29
A method of manufacture for charged colored particles comprising:
- in a first step, copolymerizing an uncharged polymerizably functionalized precursor of a charged dye radical, also called “Copolymerizable Precursor”, in an emulsion polymerization reaction and,
- in a second step, reacting at least one organic precursor of the charged dye radical able to complete the dye radical in said second step, also called “Chargeless Educt”, which leads to charge formation during the reaction itself and/or in one or more subsequent reactions, using the polymer-bound uncharged precursor moiety obtainable in the first reaction step, to form a polymer particle that carries one or more covalently bound charged dye radicals.
Compound of the formula
- wherein K4 and K5 independently are C1-C8alkyl, C1-C8alkoxy, or hydrogen;
- and
- R and Rz independently are selected from C1-C18alkyl, and C3-C45alkyl wherein one or more CH2 groups other than those bound directly to the nitrogens are replaced by O, Si(CH3)2 and/or Si(CH3)2—O;
- or R and Rz are independently selected from the group consisting of methyl, n-octyl, n-dodecyl, n-octadecyl, —CH2CH2—(OCH2CH2)3—O—(CH2)11CH3, —CH2CH2—(OCH2CH2)2—O—(CH2)17CH3, and —CH2CH2OCH2CH2CH2—Si(CH3)2—(O—Si(CH3)2)ca.11—OSi(CH3)2—CH2CH2CH2CH3.
Dependencies are inferred from the claim text.