Composite electrophoretic particles and variable transmission films containing same

A technology of composite particles and pigment particles, used in instruments, optics, nonlinear optics, etc., can solve problems such as scattering and fogging

Pending Publication Date: 2021-08-31
E INK CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the capsules are open, large pigment aggregates in the pigment-rich phase can cause scattering and haze

Method used

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  • Composite electrophoretic particles and variable transmission films containing same
  • Composite electrophoretic particles and variable transmission films containing same
  • Composite electrophoretic particles and variable transmission films containing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] A suspension of carbon black (Raven 3500, manufactured by Birla Carbon U.S.A. Inc. of Marietta, GA) in limonene and OLOA 11000 was first prepared. A suspension containing carbon black at a concentration of 25% by weight and OLOA 11000 at a concentration of 12.5% ​​by weight was dispersed and ground until the carbon black particle size was about 120 nm. This suspension was then used to prepare two sets of composite particles.

[0064] The first set of composite particles was prepared by mixing 150 g of the suspension with 570.0 g of Isopar E using a V polymer / V seed ratio of 1.5, then heating the diluted suspension and mixing it with 44.99 g of methyl methacrylate (MMA), A monomer mixture of 5.62 g hexanediol dimethacrylate (HDDM), 5.62 g trifluoroethyl methacrylate (TFEM), mixed with 0.84 g azobisisobutyronitrile was prepared (initially). After polymerization the composite particles are washed and dried.

[0065] A second set of composite particles was prepared by mix...

Embodiment 2

[0068] A second suspension was prepared using carbon black (Raven 1200, manufactured by Birla Carbon U.S.A. Inc. of Marietta, GA) in limonene and OLOA 11000. A suspension containing carbon black at a concentration of 25% by weight and OLOA 11000 at a concentration of 12.5% ​​by weight was dispersed and ground until the carbon black particle size was about 115 nm.

[0069] To examine the effect of the charge control agent (CCA) concentration on the composite particles, each composite particle sample was prepared using the same procedure as in Example 1 for the first set of composite particles, except that for some samples the type of pigment suspension and monomer was slightly changed from quantity. The type and amount (g) of pigment suspension used to make each sample, and the type and amount (g) of monomer, are provided in the table below:

[0070]

[0071] *Trimethoxysilylpropyl methacrylate

[0072] Four separate 5% by weight dispersions were prepared, each containing ...

Embodiment 3

[0075] To determine the effect of pigment particles on haze, a 1.0% by weight mixed pigment dispersion in limonene was prepared using pigment particles prepared according to Example 2 comprising Raven 3500 encapsulated in MMA-TFEM copolymer. A second control sample of a 1.0 wt % dispersion of carbon black (Raven 3500) was also prepared. Each sample of the two dispersions was then diluted with a mixture of solvents (hydrogenated terphenyl / limonene 1 / 1, w / w) with or without flocculating polymer (polystyrene, Mw ~ 35,000) such that the samples The pigment concentration varies from 0.5 to 0.01% by weight. Each sample was mixed and poured into a transparent liquid container, and after being allowed to flocculate for 10 minutes, the transmittance of light passing through the container and the haze value were measured using a spectrophotometer (CM-3600A, Konica Minolta). Figure 5 A plot of haze versus transmittance data for control samples (square symbols) and composite pigment par...

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Abstract

An electro-optic media includes either a plurality of microcapsules in a binder, a polymeric sheet containing sealed microcells, or droplets in a continuous polymeric phase. Each of the microcapsules, microcells, or droplets contain a dispersion that includes a plurality of charged composite particles and a suspending fluid, and the charged particles move through the suspending fluid under the influence of an electric field. The composite particles include one or more types of pigment particles that are at least partially coated with a polymeric material. Each of the binder, polymeric sheet, continuous polymeric phase, the charged composite particles, and the suspending fluid have an index of refraction, and a difference between the index of refraction of the composite particles and at least one of the binder, polymeric sheet, continuous polymeric phase, and solvent is less than or equal to 0.05 at 550 nm.

Description

[0001] References to related applications [0002] This application claims priority to US Patent Application Serial No. 62 / 809,978, filed February 25, 2019, which is incorporated herein by reference in its entirety. [0003] Background of the invention [0004] The present invention relates to variable transmission devices. More specifically, the present invention relates to variable transmission devices comprising an electrophoretic medium comprising composite particles that can improve the optical properties of the variable transmission device. [0005] Optical modulators represent a potentially important market for electro-optic media. As the energy performance of buildings and vehicles becomes more important, electro-optic media can be used as coatings on windows, including roof and roof windows, to enable electronically controlled penetration by changing the optical state of the electro-optic media The proportion of incident radiation to the window. Effective implementa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/167G02F1/1675
CPCG02F1/167G02F2001/1678G02F1/16757G02F1/1681C08K9/10G02F1/1676C08L33/12G02F2203/01G02F2202/022C08K2201/003C08K3/04
Inventor 朴晋圭R·J·小保利尼P·C·B·威吉J·史密斯J·W·安塞斯C·A·赫伯G·G·哈里斯M·B·罗曼诺夫斯基
Owner E INK CORPORATION
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