CN-116601000-B - Adhesive particle, adhesive agent, and light control laminate

Abstract

The invention provides adhesive particles which can inhibit dripping during heating, improve adhesion and inhibit light leakage. The adhesive particle of the present invention comprises a substrate particle and a coating portion disposed on the surface of the substrate particle, wherein the substrate particle is a black particle, and the coating portion comprises a thermosetting resin.

Inventors

• YAMADA YASUYUKI
• Hyogo Takeshi
• Xiao Linyang

Assignees

• 积水化学工业株式会社

Dates

Publication Date

20260508

Application Date

20211216

Priority Date

20201216

Claims (5)

1. 1. An adhesive particle comprising: a base particle, and a coating portion disposed on the surface of the base particle, The base material particles comprise a polymer obtained by polymerizing 1 or more than 2 kinds of polymerizable monomers having an ethylenically unsaturated group and a colorant, The substrate particles are black particles and are, The coating portion includes a thermosetting resin, The ratio of the thickness of the coating portion to the particle diameter of the adhesive particle is 0.05 or more.
2. 2. The adhesive particle according to claim 1, wherein, The thermosetting resin is an epoxy resin, The coating includes an amine curing agent.
3. 3. The adhesive particle according to claim 1 or 2, wherein, The substrate particles have a 10% K value of 10N/mm 2 to 7000N/mm 2 , The 10% k value is determined as follows: The load value and compression displacement were measured by compressing 1 substrate particle at 25℃at a compression rate of 0.3 mN/sec and a maximum test load of 20mN on a cylindrical smooth indenter end surface made of diamond having a diameter of 100 μm using a micro compression tester, and the unit of 10% K value was N/mm 2 , 10% K value= (3/2) 1/2 )·F·S -3/2 ·R -1/2 F, the load value of the base material particles when the base material particles are compressed and deformed by 10 percent is N, S, the base material particles are compressed and deformed by 10 percent of compression displacement, the unit is mm, And R is the radius of the base material particles, and the unit is mm.
4. 4. An adhesive, comprising: the adhesive particle according to any one of claims 1 to 3, and And (3) an adhesive.
5. 5. A light control laminate is provided with a 1 st substrate, a2 nd substrate, and a light control layer arranged between the 1 st substrate and the 2 nd substrate, The material of the light control layer contains the adhesive particle according to any one of claims 1 to 3.

Description

Adhesive particle, adhesive agent, and light control laminate Technical Field The present invention relates to adhesive particles. The present invention also relates to an adhesive and a light control laminate using the adhesive particles. Background Dimming materials such as dimming glass and a dimming film are sometimes used in display devices such as liquid crystal display devices and in-vehicle displays. The light control material has a property that the light transmittance changes depending on the presence or absence of an applied electric field, and is a material capable of controlling the amount of incident light. The liquid crystal display element is formed by disposing liquid crystal between 2 glass sheets or film substrates. In this liquid crystal display element, an adhesive is used for bonding 2 glass sheets or film substrates. In recent years, with the increase in screen size and flexibility of display devices, there has been an increasing demand for adhesives having higher adhesion. In order to further improve the adhesiveness of the adhesive, particles having adhesiveness (adhesive particles) may be contained in the adhesive. In addition, in order to prevent light leakage through particles in the adhesive, the particles may be colored in a dark color. Patent document 1 below discloses particles including base particles and coating portions disposed on the surfaces of the base particles. In the particle, the base material particle contains a colorant, and the material of the coating portion is a compound having a specific structure. Patent document 1 describes a thermoplastic resin as a material of the coating portion. Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2018-132740 Disclosure of Invention Technical problem to be solved by the invention In the case of particles in which the surface of the colored base particles is coated with a thermoplastic resin, the thickness of the coating layer cannot be sufficiently set, and as a result, it may be difficult to sufficiently improve the adhesiveness of the particles. In addition, the thermoplastic resin of the coating layer melts during heating to generate a drip, and as a result, the adhesiveness may be lowered. Further, when the liquid crystal display element is turned on by the occurrence of the liquid drop, a phenomenon (light leakage) may occur in which light from the backlight passes through the melted resin portion. The light leakage causes a problem that the contrast of the liquid crystal display element is lowered or the display quality called white spots (whitespot) is lowered. The purpose of the present invention is to provide adhesive particles which can suppress dripping during heating, can improve adhesion, and can suppress the occurrence of light leakage. The present invention also provides an adhesive and a light control laminate using the adhesive particles. Technical means for solving the technical problems According to a broad aspect of the present invention, there is provided an adhesive particle comprising a base particle and a coating portion disposed on a surface of the base particle, wherein the base particle is a black particle, and the coating portion comprises a thermosetting resin. In a specific aspect of the adhesive particle of the present invention, the ratio of the thickness of the coating portion to the particle diameter of the adhesive particle exceeds 0.01. In a specific aspect of the adhesive particle of the present invention, the thermosetting resin is an epoxy resin, and the coating portion includes an amine curing agent. In a specific aspect of the adhesive particle of the present invention, the substrate particle has a 10% K value of 10N/mm 2 or more and 7000N/mm 2 or less. According to a broad aspect of the present invention, there is provided an adhesive comprising the above adhesive particles and a binder. According to a broad aspect of the present invention, there is provided a light control laminate comprising a1 st substrate, a 2 nd substrate, and a light control layer disposed between the 1 st substrate and the 2 nd substrate, wherein a material of the light control layer includes the adhesive particles. Effects of the invention The adhesive particle of the present invention comprises a substrate particle and a coating portion disposed on the surface of the substrate particle, wherein the substrate particle is a black particle, and the coating portion comprises a thermosetting resin. In the adhesive particle of the present invention, since the composition is provided, dripping during heating can be suppressed, adhesion can be improved, and occurrence of light leakage can be suppressed. Drawings Fig. 1 is a cross-sectional view showing an adhesive particle according to a first embodiment of the present invention. Fig. 2 is a cross-sectional view showing an example of a PDLC type light control laminate using adhesive particles according to the first