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Coloured polymer particles

A technology of polymers and particles, applied in the direction of instruments, optics, optical components, etc., can solve the problems of lack of panchromatic system, complex peak and dimple structure and driving scheme, etc., and achieve the effect of good light resistance

Inactive Publication Date: 2014-04-23
MERCK PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main disadvantage of prior art EPDs is the lack of a bright full-color system
[0005] The use of different colored particles in a single pixel has been exemplified in recent patent literature (US7,304,634, GB2 438 436, US2007 / 0268244), but all these approaches require the use of complex dimple structures and drive schemes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Embodiment 1: Preparation of the dispersion of iron oxide red-poly(acrylamide) particles

[0072] The aqueous phase was formed by combining water (17.6 g), Ferroxide Red (Rosso 212M) (3.0 g) and poly(acrylamide) (9.6 g of a 50% by weight aqueous solution). The dispersion was stirred until homogenized, then subjected to high shear homogenization by a Branson Sonicator 450 using a horn probe at 40% intensity for 5 minutes.

[0073] In a separate three-necked flask, the oil phase was formed by combining Solsperse 17000 (2.4 g) and dodecane (60 g). The solution was stirred until homogeneous.

[0074] The aqueous phase was then added to the oil phase and stirring was maintained for a further 4 minutes. The pre-emulsion was then homogenized by a Branson Sonicator 450 using a horn probe at 40% intensity for 5 minutes to form the final emulsion. Distillation equipment was attached to the flask. Stirring was started and the emulsion was warmed to 50°C for 1 hour and kept at ...

Embodiment 2

[0075] Embodiment 2: Preparation of the dispersion of iron oxide red-poly(acrylamide) particles

[0076] The aqueous phase was formed by combining water (17.6 g), Ferroxide Red / Rosso 212M (6.0 g) and poly(acrylamide) (9.6 g of a 50% by weight aqueous solution). The dispersion was stirred until homogenized, then subjected to high shear homogenization by a Branson Sonicator 450 using a horn probe at 40% intensity for 5 minutes.

[0077] In a separate three-necked flask, the oil phase was formed by combining Solsperse 17000 (2.4 g) and dodecane (60 g). The solution was stirred until homogeneous. Insert the IKA homogenizer and use at 10000 rpm for about 1 minute.

[0078] The water phase was then added dropwise to the oil phase over the course of 2 minutes, and homogenization using high shear stirring was maintained for a further 3 minutes. The pre-emulsion was then subjected to high shear homogenization by a Branson Sonicator 450 using a horn probe at 40% intensity for 5 minut...

Embodiment 3

[0079] Embodiment 3: Preparation of the dispersion of iron oxide red-poly(acrylamide) particles

[0080] The aqueous phase was formed by combining water (17.6 g), Ferroxide Red (Rosso 216M) (12.0 g) and poly(acrylamide) (9.6 g of a 50% by weight aqueous solution). The dispersion was stirred until homogenized and then homogenized by a Branson Sonicator 450 using a horn probe at 40% intensity for 5 minutes.

[0081] In a separate three-necked flask, the oil phase was formed by combining Solsperse 17000 (2.4 g) and dodecane (60 g). The solution was stirred until homogeneous. Insert the IKA homogenizer and use at 10000 rpm for about 1 minute.

[0082] The water phase was then added dropwise to the oil phase over the course of 2 minutes, and high shear stirring was maintained for an additional 3 minutes. The pre-emulsion was then homogenized by a Branson Sonicator 450 using a horn probe at 40% intensity for 5 minutes to form the final emulsion. Distillation equipment was attach...

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Abstract

This invention relates to coloured polymer particles prepared by a reverse emulsion solvent removal process, electrophoretic fluids comprising such particles, and electrophoretic display devices comprising such fluids.

Description

technical field [0001] The present invention relates to colored polymer particles prepared by inverse emulsion solvent removal, electrophoretic fluids comprising such particles and electrophoretic display devices comprising such fluids. Background technique [0002] In recent years, there has been demand for low-power, low-cost, and lightweight display devices. EPD (Electrophoretic Display) can meet this demand. One use of EPDs is for electronic paper. Crucially, once an image is displayed, it can be maintained for long periods of time without the application of additional voltage. Therefore, this satisfies the need for low power usage and means that the image is visible until another image is required. [0003] EPDs generally comprise charged particles dispersed in a fluid and confined between two substrates, each comprising one or more electrodes. The space between the electrodes is filled with a dispersion medium whose color is colorless or different from that of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K3/00C08K3/24C09B69/10G02F1/167
CPCC08K3/0033C09B67/009C08K3/013G02F1/167G02B1/04C08K2201/011
Inventor 路易斯·迪亚娜·法兰德乔纳森·亨利·威尔逊埃米莉·简·托马斯阿什利·内森·史密斯
Owner MERCK PATENT GMBH
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