KR20130035410A

KR20130035410A - The method of a pdlc type light control body

Info

Publication number: KR20130035410A
Application number: KR1020110099696A
Authority: KR
Inventors: 홍진후; 김양배; 조정대; 박수철
Original assignee: 주식회사 큐시스
Priority date: 2011-09-30
Filing date: 2011-09-30
Publication date: 2013-04-09

Abstract

PURPOSE: A PDLC type lighting unit is provided to totally harden a polymer dispersed liquid crystal and both surfaces of a polymer dispersed liquid crystal layer. CONSTITUTION: A polymer dispersed liquid crystal is coated on a transparent base plate(2b) which is formed on an ITO(Indium Tin Oxide) electrode layer. A transparent base plate(2a) is formed on the polymer dispersed liquid crystal. The light of a UV-LED(UltraViolet Light Emitting Diode) light source(5a) is irradiated on the transparent base plate to form a PDLC type lighting unit.

Description

The method of a PDLC type light control body}

The present invention relates to a method for producing a PDLC type light adjuster.

A PDLC (Polymer Dispered Liquid Crystal) dimmer is formed of droplets of fine liquid crystal in a matrix of a polymer material and reacts with a voltage applied from the outside, so that the liquid crystal is applied in a state in which a liquid crystal is applied. The light is transmitted by matching the direction of light passing through the dimming body, and the light is transmitted in the state in which no voltage is applied. Will spawn. That is, the PDLC type dimming member may be driven in two states, in which light is transmitted and scattered, depending on whether a voltage is applied.

Unlike other liquid crystal displays that use nematics, such PDLC type dimming bodies have good brightness without using a polarizing plate, and since the rubbing process for aligning liquid crystals is omitted, the manufacturing process is simple, and thus it is widely used in devices such as window shielding films. The present invention can be applied to a large area display device.

Usually, a PDLC (Polymer Dispered Liquid Crystal) dimming body forms a polymer dispersed liquid crystal composition containing a liquid crystal, an oligomer, a monomer, a dye, a photoinitiator, an additive, and the like between two transparent base plates on which a transparent electrode layer is formed, When the ultraviolet-ray is irradiated to the polymer dispersed liquid crystal composition layer for manufacturing the light adjuster formed between the transparent base plate, the oligomer, monomer and the like are photocured by the photoinitiator included in the composition to form a polymer material matrix and Droplets are prepared to form in a dispersed form.

At this time, the ultraviolet light irradiated to the polymer dispersed liquid crystal composition layer for dimming body manufacturing formed between two transparent base plates in a conventional PDLC type dimming body manufacturing method is a tubular lamp (metal halide or mercury lamp). Ultraviolet light exposure machine which uses as a light source is mainly used. However, these tubular lamps have a disadvantage in that it is difficult to control the wavelength and intensity of ultraviolet rays, and unnecessary heat is generated by high temperature, so that photocuring rate control of the polymer dispersed liquid crystal composition is not easy. As a result, the polymerization temperature is out of the proper range due to the high heat generated from the lamp and the ultraviolet rays which are too strong, and as the photocuring speed is increased, the phase separation speed of the polymer matrix and the liquid crystal is increased. There is a problem that becomes smaller than the size and the distribution of the droplets also out of the proper range does not achieve a uniform distribution. Thus, in the case of the PDLC type light adjuster manufactured by the conventional method, there is a problem in that the relative contrast ratio is lowered and the driving voltage is increased when voltage is applied, which is one of important optical characteristics. In addition, when high heat and ultraviolet rays are irradiated, the polymer dispersed liquid crystal composition layer between the two transparent substrates on which the transparent electrode layer is formed becomes too hard due to over curing, thereby removing the polymer material matrix for forming a terminal on the transparent electrode layer. This is a difficult problem.

Thus, a method of irradiating long-wavelength light using UV-LED as an exposure machine for irradiating ultraviolet light to the polymer dispersed liquid crystal composition layer has been studied (Patent Publication No. 2011-0062215), but generally light in the polymer dispersed liquid crystal composition layer When irradiated with light, as shown in FIG. 1, since light is irradiated from only one surface, when the irradiated light has a long wavelength, the light from the light source may not completely cure the composition layer, and the composition layer close to the light source. The size of the droplets of the surface portion and the opposite surface portion of the may not be uniform, there was a problem that can inherent various disadvantages.

The present invention is to fully cure the polymer liquid crystal dispersion composition layer when the PDLC type dimming body is manufactured using long-wavelength UV-LED light, and in particular, both the upper and lower surfaces of the polymer liquid crystal dispersion composition layer can be completely cured uniformly. An object of the present invention is to provide a method for producing a PDLC type light adjuster.

Method for producing a PDLC type light adjuster according to the present invention comprises the steps of preparing a polymer dispersed liquid crystal composition for manufacturing PDLC type light adjuster; Forming a polymer dispersed liquid crystal composition for manufacturing the PDLC type light adjuster between two transparent substrates on which a transparent electrode layer is formed; And irradiating UV-LED light having a wavelength range of 350 to 460 nm to 600 mJ / cm ² or more to the polymer dispersed liquid crystal composition layer for preparing the PDLC type light adjuster formed between the two transparent substrates.

Here, in the step of forming the polymer dispersed liquid crystal composition for manufacturing a PDLC type light adjuster between two transparent substrates on which a transparent electrode layer is formed, the polymer dispersed liquid crystal composition for manufacturing a PDLC type light adjuster is formed between the two transparent substrates. In the case of forming a thickness of 20 μm or more, it is preferable to irradiate UV-LED light irradiated in the photocuring step on both surfaces of the two transparent substrates. In addition, the UV-LED (Light emitting diode) light is more preferably a wavelength of 365nm, 395nm, 405nm or 455nm.

In addition, the polymer dispersed liquid crystal composition prepared in the step of preparing a polymer dispersed liquid crystal composition for manufacturing a PDLC type photoconductor includes a liquid crystal, an oligomer, a monomer, a dye, a photoinitiator and an additive, and the photoinitiator has an absorption peak at a wavelength in the 350 to 460 nm range. It is preferably formed. Preferred examples of photoinitiators that satisfy these conditions include diphenyl (2,4,6-trimethylbenzoyl) -phosphine oxide, phenylbis (2,4,6-trimethylbenzoyl) -phosphine oxide, bis (eta 5-2). , 4-cyclopentadien-1-yl) bis [2,6-difluoro-3- (1H-pyrrol-1-yl) phenyl] titanium, 2-methyl-1 [4- (methylthio) phenyl] It may be at least one selected from the group consisting of -2-morpholinopropane-1-one and 2,2-dimethoxy-2-phenylacetophenone.

The present invention is to fully cure the polymer liquid crystal dispersion composition layer when the PDLC type dimming body is manufactured using long-wavelength UV-LED light, and in particular, both the upper and lower surfaces of the polymer liquid crystal dispersion composition layer can be completely cured uniformly. A method for producing a PDLC type light adjuster is provided.

1 is a schematic view showing a UV-LED photocuring process according to a conventional invention and an embodiment of the present invention.
2 is a schematic view showing a UV-LED photocuring process according to an embodiment of the present invention.
Figure 3 is a graph measuring the absorbance of each wavelength band of the photoinitiator included in the Examples or Comparative Examples of the present invention.

Method for producing a PDLC type light adjuster according to the present invention comprises the steps of preparing a polymer dispersed liquid crystal composition for manufacturing a PDLC type light adjuster; Forming a polymer dispersed liquid crystal composition for manufacturing the PDLC type light adjuster between two transparent substrates on which a transparent electrode layer is formed; And irradiating UV-LED light having a wavelength range of 350 to 460 nm to 600 mJ / cm ² or more to the polymer dispersed liquid crystal composition layer for preparing the PDLC type light adjuster formed between the two transparent substrates.

That is, as shown in FIG. 1, when the exposure process is performed on the upper surface 5a in the UV-LED irradiation region of the polymer dispersed liquid crystal composition layer 3 formed between the two transparent substrate plates 2a and 2b, By making the amount of light irradiated by UV-LED into 600 mJ / cm <^2> or more, the polymer dispersed liquid crystal composition layer 3 can fully harden | cure.

Particularly, in the step of forming the polymer dispersed liquid crystal composition for manufacturing a PDLC type light adjuster between two transparent substrates on which a transparent electrode layer is formed, the polymer dispersed liquid crystal composition for manufacturing a PDLC type illuminator formed between the two transparent substrates is 20 In the case of forming the film having a thickness of about 탆 or more, it is preferable to irradiate UV-LEC light irradiated in the photocuring step on both surfaces of the two transparent substrates.

That is, as shown in Figure 2, both surfaces on the upper surface (5a) and the lower surface (5b) at the same time in the UV-LED irradiation area of the polymer dispersed liquid crystal composition layer 3 formed between the two transparent substrates (2a, 2b) By irradiating, when the polymer-dispersed liquid crystal composition layer 3 is cured, both upper and lower surfaces are cured at the same time, thereby allowing complete curing while having a uniform degree of curing as a whole.

At this time, the ultraviolet light emitted from the UV-LED light source is most preferably a wavelength of 365 nm, 395 nm, 405 nm or 455 nm in the long wavelength region. Here, the plurality of UV-LED alignment direction may be a vertical direction, a gentle curved direction, and the like, and the arrangement may be a cross arrangement, a radial arrangement, or the like.

As such, by curing the polymer dispersed liquid crystal composition layer using a long wavelength UV-LED light source, there is almost no unnecessary heat generation, and it is easy to control the photocuring rate and phase separation rate of the polymer material matrix and the liquid crystal, thereby providing a relative contrast ratio. The pendulum hardness of the photocured polymer matrix is 20 ~ 70 s, so that the size and uniform distribution of droplets can be formed in an appropriate range to reduce the driving voltage, and the terminal formation work is easy on the transparent electrode layer. It is possible to manufacture a PDLC type dimming body having a range of.

The polymer-dispersed liquid crystal composition for preparing a PDLC type dimming body used in the present invention includes a liquid crystal, an oligomer, a monomer, a dye, a photoinitiator, and an additive, and the photoinitiator absorbs light in a wavelength range of 350 to 460 nm to enable radical formation reaction even in a long wavelength region. When the peak is formed, when the PDLC type dimming body is manufactured using long wavelength light, the photocuring reaction of the polymer matrix of the PDLC type dimming body may be better by light irradiation in the wavelength range of 350 to 460 nm. will be.

Examples of such photoinitiators include diphenyl (2,4,6-trimethylbenzoyl) -phosphine oxide (MAPO) (DAROCUR TPO, from Ciba Specialty Chemicals), phenylbis (2,4,6-trimethylbenzoyl) -phosphine Oxides (BAPO) (manufactured by Ciba Specialty Chemicals, Irgacure 819), bis (eta 5-2,4-cyclopentadien-1-yl) bis [2,6-difluoro-3- (1H-pyrrole-1 -Yl) phenyl] titanium (Metallocene) (Ciba Specialty Chemicals, IRGACURE 784), 2-methyl-1 [4- (methylthio) phenyl] -2-morpholinopropan-1-one (Ciba Specialty Chemicals) Product, IRGACURE 907) and 2,2-dimethoxy-2-phenylacetophenone (manufactured by Ciba Specialty Chemicals, IRGACURE 651). That is, among the long-wavelength photoinitiators, the absorption graph for each wavelength band of the Irgacure 819 shows a maximum absorption peak at a wavelength of about 300 nm, as shown in Fig. 3, and after that, the absorption peak appears at a wavelength range of about 380 to 420 nm. The radical formation reaction can occur very well in the region.

The liquid crystals, oligomers, monomers, dyes, additives, and the like contained in the polymer dispersed liquid crystal composition for manufacturing a PDLC type dimming body of the present invention may be selected as conventional ones used in a conventional polymer dispersed liquid crystal composition for manufacturing a PDLC type dimming body.

Typically, the liquid crystal used in the polymer-dispersed liquid crystal composition for preparing PDLC type photoconductor is 4-n-propyl-4'-cyanobiphenyl, 4-n-butyl-4'-cyanobiphenyl, 4-n-pentyl-4 '-Cyanobiphenyl, 4-n-heptyl-4'-cyanobiphenyl, 4-n-octyloxy-4'-cyanobiphenyl, 4-trans-propyl cyclohexyl cyanobenzene, 4-trans-butyl cyclo Hexyl cyanobenzene, 4-trans-pentyl cyclohexyl cyanobenzene, 4-trans-hexyl cyclohexyl cyanobenzene, 4-trans-heptyl cyclohexyl cyanobenzene, 4-cyanoheptyl-4'-trans-propyl Cyclohexylcarboxylate, 4-cyanoheptyl-4'-trans-butylcyclohexyl carboxylate, 4-cyanoheptyl-4'-trans-pentylcyclohexyl carboxylate, 4-cyanophenyl-t-butylbenzoate , 4-n-pentyl-4'-cyano-p-terphenyl, 4-cyano-4'-trans-pentylcyclohexanebiphenyl, 4-cyano-phenyl-4'-trans-pentylcyclohexyl benzo Eight, 4-trans-propylcy Lohexyl-4'-ethylbiphenyl, 4-trans-pentylcyclohexyl-4'-ethylbiphenyl, 4-methoxymethylphenyl-4- (trans-4-propylcyclohexyl) -benzoate, 4-ethylphenyl 1 or 2 from -4'-trans-pentylcyclohexyl benzoate, 4-ethoxyphenyl-4'-trans-pentylcyclohexyl benzoate, 4-fluoro-phenyl-4'-trans-pentylcyclohexyl benzoate More than one species can be selected and combined.

As a composition for forming the polymer matrix, the oligomer may be selected from alkyl 3-mecaptopropionate, alkylthiochorate, alkylthiol, urethane oligomer having one or more allyl groups, urethane acrylate oligomer, polyester acrylate oligomer, One type or two types or more can be selected and combined from an epoxy acrylate oligomer. The monomers can be used in combination among monofunctional or polyfunctional acrylate monomers and vinyl ether monomers. For example, hydroxyethyl acrylate (HEA), hydroxyethyl methacrylate (HEMA), 1,6-hexanediol acrylate (HDDA), tripropylene glycol diacrylate (TPGDA) and trimethylol propane triacrylic 1 type, or 2 or more types can be selected and combined from a rate (TMPTA), butanediol monovinyl ether, 1, 4- cyclohexane dimethanol monovinyl ether, and triethylene glycol divinyl ether.

The dye is one or two or more from azo dyes, anthraquinone dyes, phenylene dyes, melocyanine dyes, azomethine dyes, phthaloperylene dyes, indigo dyes, azulene dyes, dioxazine dyes and polythiophene dyes. Can be selected and combined. At this time, the dye may be used in combination of two or more dyes, or may be included alone, depending on the color to be expressed in the dimmer. Specifically, what is described in [Dichroic Dyes for Liquid Crystal Display] (A.V. Ivashchenko, CRC, 1994) can be mentioned.

Preferably it is an azo dye, an anthraquinone pigment, and a perylene pigment, Especially preferably, they are an azo pigment and an anthraquinone pigment. As the azo dye, any of a monoazo dye, a bisazo dye, a trisazo dye, a tetrakisazo dye, a pentakisazo dye and the like is preferable, and a monoazo dye, a bisazo dye and a trisazo dye are preferable. Azo dyes generally include a ring structure, which includes a carbon aromatic ring (benzene ring, naphthalene ring, etc.) and a heterocyclic ring (quinoline ring, pyridine ring, thiazole ring, benzothiazole ring, oxazole ring, Benzoxazole ring, imidazole ring, benzoimidazole ring, pyrimidine ring and the like). The anthraquinone dye preferably contains an oxygen atom, a sulfur atom or a nitrogen atom as a substituent, and preferably contains an alkoxy, aryloxy, alkylthio, arylthio, alkylamino or arylamino group. Although the number of substitution of the substituent may be any number, di-substitution, tri-substitution, and tetrakis-substitution are preferable, and di-substitution and tri-substitution are especially preferable. The substitution position of the substituent may be any place, but preferably 1,4-position di-substitution, 1,5-position di-substitution, 1,4,5-position tri-substitution, 1,2,4-position tri-substitution, 1,2,5-position tri-substituted, 1,2,4,5-position tetra-substituted, 1,2,5,6-position tetra-substituted structures.

Here, as an additive, an antioxidant, an ultraviolet absorber, a surfactant, an antifoaming agent, etc. may be further included as needed.

Hereinafter, examples and comparative examples of the present invention will be described, but the scope of the present invention is not limited thereto.

Example 1

-Preparation of Polymer Dispersed Liquid Crystal Composition for PDLC Type Dimming Body Manufacturing

60 wt% of Merk's E7 nematic liquid crystal compound as a liquid crystal, 26 wt% of NOA 65 (urethane oligomer of allylether groups, manufactured by Norland, USA), long-wavelength photoinitiator phenylbis (2,4,6-trimethylbenzoyl) 4 wt% of phosphine oxide (Irgacure 819, manufactured by Ciba Specialty Chemicals), as a monomer, was prepared by mixing 10 wt% of hexanediol diacrylate (HDDA).

- Preparation of PDLC type light modulator

The polymer dispersed liquid crystal composition for preparing the PDLC type dimming body was applied to a thickness of 20 μm on one surface of a transparent substrate (188 μm, PET film, Toray, Japan) having a transparent electrode layer (ITO (Indium Tin Oxide) electrode layer) formed thereon. The same transparent substrate as that of the transparent substrate on which the transparent electrode layer was formed was laminated thereon. Subsequently, light having a wavelength of 395 nm was irradiated onto the polymer dispersed liquid crystal composition layer for manufacturing a light adjuster through the transparent substrate by using a 395 nm UV-LED lamp (UV energy: 800 mJ / cm ² ) light source. To prepare a PDLC type light adjuster of Example 1 of the present invention.

Example 2

Using a 395 nm UV-LED lamp light source, except that the UV energy of the irradiated light is 600 mJ / cm ² was prepared in the same manner as in Example 1 to prepare a polymer dispersed liquid crystal composition for the production of PDLC dimming, and a PDLC dimming Prepared.

Comparative Example 1

Using a 395 nm UV-LED lamp light source, except that the UV energy of the irradiated light is irradiated with 400 mJ / cm ² to prepare a polymer dispersed liquid crystal composition for the production of PDLC type dimming body as in Example 1 Prepared.

Comparative Example 2

A polymer dispersed liquid crystal composition for preparing a PDLC type light adjuster was prepared in the same manner as in Example 1, except that 4 wt% of 1-hydroxycyclohexyl-phenylketone (Irgacure 184, manufactured by Ciba Specialty Chemicals), a short wavelength photoinitiator, was used as the photoinitiator. And a PDLC type light adjuster was prepared.

Comparative Example 3

A value measured in a metal halide lamp (UV energy: 1200 mJ / cm ² , UVA (320 to 390 nm)) region in the step of preparing a polymer dispersed liquid crystal composition for preparing a PDLC type dimming body and irradiating light as in Example 1 PDLC-type illuminators were prepared in the same manner as in Example 1 except that a light source was used.

Comparative Example 4

A polymer dispersed liquid crystal composition for preparing a PDLC type light adjuster was prepared in the same manner as in Example 1, except that 4 wt% of 1-hydroxycyclohexyl-phenylketone (Irgacure 184, manufactured by Ciba Specialty Chemicals), which was a short wavelength photoinitiator, was used as the photoinitiator. A PDLC type light adjuster was prepared in the same manner as in Example 1 except that a metal halide lamp (UV energy: 1200 mJ / cm ² , UVA (320 to 390 nm) region) light source was used in the step of irradiating light.

Example 3

In the step of irradiating the light using a 395 nm UV-LED lamp (UV energy: 1200 mJ / cm ² ) as a light source, the light is irradiated from both sides of the object to be irradiated, the thickness of the polymer dispersed liquid crystal composition layer is 30㎛ A polymer dispersed liquid crystal composition for preparing a PDLC type light adjuster was prepared in the same manner as in Example 1 except that it was coated with to prepare a PDLC type light adjuster.

Comparative Example 5

In the same manner as in Example 2, the polymer-dispersed liquid crystal composition for preparing a PDLC-type illuminant was prepared, and in the step of irradiating light, a 395 nm UV-LED lamp (UV energy: 1200 mJ / cm ² ) light source was used, A PDLC type light adjuster was manufactured in the same manner as in Example 2 except that only one side of the light was irradiated.

Comparative Example 6

In the same manner as in Example 2, a polymer dispersed liquid crystal composition for preparing a PDLC type light adjuster was prepared, and a metal halide lamp (UV energy: 1200 mJ / cm ² , UVA (320 to 390 nm) region) light source was used in the step of irradiating light. In the same manner as in Example 2, except that light was irradiated only on one surface of the object to be irradiated, a PDLC type light adjuster was prepared.

The light absorption spectra of each wavelength band of photoinitiators (Irga 819, Irga 184) included in Examples or Comparative Examples of the present invention were obtained using a Cary 3 Bio UV-visible spectrophotometer. Samples were prepared by diluting methylene chloride to a concentration of 0.02 g / l, and absorbance was measured using a quarts cell of 1 cm length, and the results are shown in FIG. 3.

Pendulum hardness, adhesive force, driving voltage, contrast ratio and the like of the PDLC type light adjusters prepared from Examples 1 to 3 and Comparative Examples 1 to 6 were evaluated as follows, and the results are shown in Table 1 below. Pendulum hardness, adhesive force, contrast ratio and driving voltage of PDLC-type illuminators were measured as follows.

1) peel adhesion strength test

Peel adhesion was measured using a Tinus Olsen H5KS instrument according to ASTM D3654 method. At this time, the peeling angle was 180 ° and the peeling rate was 300 mm / min.

2) Pendulum hardness test

The pendulum hardness was measured according to ASTM D4366 method using Sheen's K. nig ref. 707KP instrument. The K ㆆ nig pendulum has a triangular shape and weighs 200 ± 0.2 g. Two ball bearings with a diameter of 5 mm are attached to the axis of rotation. The pendulum hardness value is expressed in seconds (s), which is a unit of time, and the period of vibration is 1.4 ± 0.02 s. Pendulum hardness is useful for measuring the softness of a sample.

3) Contrast Ratio and Driving Voltage Measurement

Contrast ratio was measured using Avantes' Avaspec-2048 visible spectrometer. As a light source, a halogen lamp (Avalight-HAL, Avantes) was used. The drive voltage was measured using the spectrometer and AC power supply. In the measurement method, the change in the transmittance of the measurement object was observed while increasing the voltage of the AC power supply by 2 V, and the voltage at the point when no change in the transmittance appeared was taken as the driving voltage.

division lamp Quantity of light
(mJ / cm ² ) Photoinitiator Light irradiation direction Composition layer
thickness
(Μm) Pendulum Hardness
(s) Exfoliation
Adhesion
(N / in) Control ratio
(T _on / T _off ) Driving voltage
(V) Example 1 UV-LED 800 Irga 819 One side 20 41 2.0 98 45 Example 2 UV-LED 600 Irga 819 One side 20 37 1.5 78 42 Comparative Example 1 UV-LED 400 Irga 819 One side 20 28 1.0 37 39 Comparative Example 2 UV-LED 800 Irga 184 One side 20 10 0.6 7 33 Comparative Example 3 Metal
halide 2500 Irga 819 One side 20 75 4.2 20 82 Comparative Example 4 Metal
halide 2500 Irga 184 One side 20 19 0.9 11 40 Example 3 UV-LED 1600 Irga 819 both sides 30 49 2.3 86 48 Comparative Example 5 UV-LED 800 Irga 819 One side 30 30 1.4 41 42 Comparative Example 6 Metal
halide 2500 Irga 819 One side 30 62 3.4 9 76

In Table 1, when the polymer dispersed liquid crystal composition layer containing a short wavelength photoinitiator was irradiated with a light source of a 395 nm UV-LED lamp or a light source of a metal halide lamp as in Comparative Examples 2 and 4, sufficient photocuring was achieved. A light adjuster having a level of optical and physical properties that could not be used as a light adjuster was produced.

Moreover, when the light irradiation direction of the 395 nm UV-LED lamp light source of Example 1 was either one side, and the composition layer thickness is 20 micrometers, the pendulum hardness of the photo-cured polymer dispersed liquid crystal composition layer was 41 s, peeling adhesive force Is 2.0 N / in, and it is easy to remove the matrix of polymer material for terminal formation, and the contrast ratio of optical properties is much better than that of other comparative examples, and the driving voltage is 45 V, which satisfies 60 V or less. have. Also in Example 2, a dimmer having a good level of optical and physical properties without any problem in use as a dimmer was produced.

In the case of photocuring using the metal halide lamp light source of Comparative Example 2, due to the high UV energy and high heat generated from the lamp, pendulum hardness and peel adhesion are so high that it is difficult to remove the matrix of polymer material for terminal formation. The transparent electrode layer on the transparent substrate was damaged, and the photocured composition layer was so hard that the driving voltage was high.

As in Example 3, when the light irradiation direction of the 395 nm UV-LED lamp light source is upper and lower sides and the composition layer thickness is 30 μm, the pendulum hardness is 49 s and the peel adhesion is 2.3 N / in The matrix removal operation was easy, and the contrast ratio of the optical properties and the driving voltage of the electrical properties also showed good levels, so that when the thickness of the composition layer became thick, each of the comparative examples 5 and 6 where light was irradiated from both sides was irradiated only on one side. You can see that it was much more effective.

1: UV-LED photocuring process part
2a, 2b: transparent substrate
3: polymer dispersed liquid crystal composition layer
4: roll
5: UV-LED light irradiation area
5a, 5b: UV-LED light emitting part

Claims

Preparing a polymer dispersed liquid crystal composition for preparing a PDLC type light adjuster;
Forming a polymer dispersed liquid crystal composition for manufacturing the PDLC type light adjuster between two transparent substrates on which a transparent electrode layer is formed;
PDLC-type illuminators comprising the step of irradiating UV-LED light in the 350 ~ 460nm wavelength range of 600 mJ / cm ² or more to the polymer dispersed liquid crystal composition layer for PDLC dimming body manufacturing layer formed between the two transparent substrates Manufacturing method.

The polymer dispersion for preparing a PDLC type light adjuster according to claim 1, wherein the polymer dispersed liquid crystal composition for manufacturing a PDLC type light adjuster is formed between the two transparent substrates in a step of forming a liquid crystal composition between two transparent substrates on which a transparent electrode layer is formed. When the liquid crystal composition is formed to a thickness of 20 μm or more, the manufacturing method of the PDLC-type illuminator, wherein the UV-LED light irradiated in the photocuring step is irradiated from both surfaces of the two transparent substrates.

The method of claim 1, wherein the light emitting diode (UV-LED) light has a wavelength of 365 nm, 395 nm, 405 nm or 455 nm.

The method of claim 1, wherein the polymer dispersed liquid crystal composition in the step of preparing a polymer dispersed liquid crystal composition for manufacturing a PDLC type light adjuster comprises a liquid crystal, an oligomer, a monomer, a dye and a photoinitiator, the photoinitiator has a wavelength of 350 ~ 460nm wavelength range Method for producing a PDLC type light adjuster, characterized in that the absorption peak is formed in.

The method of claim 4, wherein the photoinitiator is diphenyl (2,4,6-trimethylbenzoyl) -phosphine oxide, phenylbis (2,4,6-trimethylbenzoyl) -phosphine oxide, bis (eta 5-2, 4-cyclopentadien-1-yl) bis [2,6-difluoro-3- (1H-pyrrol-1-yl) phenyl] titanium, 2-methyl-1 [4- (methylthio) phenyl]- A method for producing a PDLC type light adjuster, characterized in that at least one member selected from the group consisting of 2-morpholinopropane-1-one and 2,2-dimethoxy-2-phenylacetophenone.