# US 2013/0155486 A1 · Ink composition used in electrowetting display device and electrowetting display device employing the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0155486 A1 - Document ID: US20130155486A1 - Status: Published application - Kind: A1 - Application number: 13/555,542 - Filed: 2012-07-23 - Published: 2013-06-20 - Earliest claimed: 2011-12-15 - Assignees: Industrial Technology Research Institute - Inventors: Ming-Tzung WU; Te-Yi Chang; Chin-Hua Chang; Wen-Jiunn Chen; Yu-Chin Lin; Ching-Mao Wu - Web page: https://patentgrep.com/patent/US20130155486A1 ## CPC - C09D 11/037: characterised by the pigment - C09D 11/033: characterised by the solvent - G02B 26/005: {based on electrowetting} - C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract Disclosed is an ink composition used in an electrowetting display device and an electrowetting display device employing the same. The ink composition used in the electrowetting display device includes a non-polar solvent and a modified hydrophobic pigment, wherein the modified hydrophobic pigment has a structure represented by Formula (I), of P-Gn wherein P is a pigment moiety, n is 1-4 and G is wherein R1 is a straight chain or a branched C4-20 alkyl group, or C5-20 cycloalkyl group. ## Claims ### Claim 1 An ink composition used in an electrowetting display device, comprising: a non-polar solvent; and a modified hydrophobic pigment having a structure represented by Formula (I) P-Gn Formula (I) wherein P is a pigment moiety, n is 1-4 and G is wherein R1 is a straight chain or a branched C4-20 alkyl group, or C5-20 cycloalkyl group. ### Claim 2 (depends on 1) The ink composition used in the electrowetting display device as claimed in claim 1, wherein R1 is an n-butyl group, n-hexyl group, n-octyl group, or dodecyl group, tetradecyl group, or eicosyl group. ### Claim 3 (depends on 1) The ink composition used in the electrowetting display device as claimed in claim 1, wherein R1 is present in a weight percentage of between 0.1 to 95%, based on the molecular weight of the modified hydrophobic pigment. ### Claim 4 (depends on 1) The ink composition used in the electrowetting display device as claimed in claim 1, wherein R1 is present in a weight percentage of between 0.5 to 20%, based on the molecular weight of the modified hydrophobic pigment. ### Claim 5 (depends on 1) The ink composition used in the electrowetting display device as claimed in claim 1, wherein the non-polar solvent has a weight percentage of 50-99 wt %, and the modified hydrophobic pigment has a weight percentage of 1-50 wt %, based on the weight of the non-polar solvent and the modified hydrophobic pigment. ### Claim 6 (depends on 1) The ink composition used in the electrowetting display device as claimed in claim 1, wherein the non-polar solvent has a weight percentage of 75-85 wt %, and the modified hydrophobic pigment has a weight percentage of 15-25 wt %, based on the weight of the non-polar solvent and the modified hydrophobic pigment. ### Claim 7 (depends on 1) The ink composition used in the electrowetting display device as claimed in claim 1, wherein the modified hydrophobic pigment has a particle size of between 1-150 nm. ### Claim 8 (depends on 1) The ink composition used in the electrowetting display device as claimed in claim 1, wherein the modified hydrophobic pigment has a particle size of between 20-150 nm. ### Claim 9 (depends on 1) The ink composition used in the electrowetting display device as claimed in claim 1, wherein the ink composition used in the electrowetting display device has a viscosity of between 1-15 cps. ### Claim 10 (depends on 1) The ink composition used in the electrowetting display device as claimed in claim 1, wherein the modified hydrophobic pigment is a pigment having a hydrophobic group, wherein the pigment comprises azo pigment, phthalocyanine pigment, quinacridone pigment, flavanthrone pigment, anthanthrone pigment, pyranthrone pigment, thioindigo pigment, dioxazine pigment, isoindolinone pigment, perylene tetracarboxylic acid pigment, naphthalene tetracarboxylic acid pigment, or lake pigment. ### Claim 11 (depends on 10) The ink composition used in the electrowetting display device as claimed in claim 10, wherein the pigment does not contain a metal element. ### Claim 12 (depends on 1) The ink composition used in the electrowetting display device as claimed in claim 1, wherein the ink composition used in the electrowetting display device has a surface tension of between 20-30 mN/m. ### Claim 13 (depends on 1) The ink composition used in the electrowetting display device as claimed in claim 1, wherein the ink composition used in the electrowetting display device has a surface charge of between 5-30 mv. ### Claim 14 (depends on 1) The ink composition used in the electrowetting display device as claimed in claim 1, wherein the ink composition used in the electrowetting display device has a dielectric constant of between 1-20. ### Claim 15 (depends on 1) The ink composition used in the electrowetting display device as claimed in claim 1, wherein P has a benzene residual group, and G is bonded with P via the benzene residual group. ### Claim 16 (depends on 1) The ink composition used in the electrowetting display device as claimed in claim 1, further comprising: a dispersant. ### Claim 17 (depends on 16) The ink composition used in the electrowetting display device as claimed in claim 16, further comprising: a demulsifying agent, antifoaming agent, leveling agent, adhesive agent, or combinations thereof. ### Claim 18 (depends on 1) An electrowetting display device, comprising: a first substrate; a transparent electrode layer disposed on the first substrate; a dielectric layer disposed on the transparent electrode layer; a partition wall structure directly disposed on the dielectric layer; a second substrate disposed opposite to the first substrate, wherein a receiving space is defined between the first substrate and the second substrate; and a transparent polar solution and the ink composition used in the electrowetting display device as claimed in claim 1 filling the receiving space.