JPH06208095A - Deposition lamination method and laminate and window formed by using this method - Google Patents

Abstract

PURPOSE:To establish the method for easily producing the laminate having a liquid crystal which has excellent coloration and transparency and is free from air bubbles by heating an aq. soln. of a linear homopolysaccharide deriv. and water to cause clouding and flocculating of the linear homopolysaccharide deriv. and depositing the precipitate thereof on a substrate, then laminating a counter substrate on this substrate and to provide the window formed by using such laminate. CONSTITUTION:The ordinary transparent general aq. soln. consisting of the linear homopolysaccharicle deriv., the water and further, additives, such as water-soluble electrolyte, is heated to cause the clouding and flocculating of the linear homopolysaccharide deriv. and the flocculated precipitate thereof is deposited on the substrate. The counter substrate is laminated on this substrate after the precipitate is adjusted to the concn. exhibiting the liquid crystal. The aq. soln. consisting of the linear homopolysaccharide deriv. and the water is lower in viscosity, is more easily deformable and dissolves more uniformly as its concn. is lower. The hydrophobic bonding strength among the molecules of the linear homopolysaccharide cleriv. increases sharply when the high-viscosity aq. soln. is heated up even if this soln. has the high concn. The liquid viscosity decreases sharply when the state of the very small random clouded flocs is attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a liquid crystal laminate having excellent liquid crystal characteristics without directly touching a highly viscous lyotropic cholesteric liquid crystal, a laminate and a window using the laminate. It is a thing.

[0002]

2. Description of the Related Art Conventionally, there have been three types of liquid crystals, nematic, smectic, and cholestic, and they have been extensively researched and developed. It is known that the cholesteric liquid crystal shows a rainbow interference color by selectively reflecting visible light due to the helical molecular arrangement, and this coloration reversibly changes depending on temperature. The liquid crystal also includes a lyotropic liquid crystal that takes a liquid crystal phase by mixing a thermotropic liquid crystal that changes from an individual to a liquid crystal by heating and a solvent.

Here, the present invention relates to a lyotropic cholesteric liquid crystal having a solvent effect, not to a nematic liquid crystal used for a thin display and a thermotropic cholesteric liquid crystal used for a temperature indicating material. Further, as the high molecular type, there are liquid crystals in which a linear homopolysaccharide derivative (for example, "hydroxypropyl cellulose) is dissolved at a high concentration and liquid crystals in which polyamino acid esters (for example, poly-γ-benzyl-L-glutamate) are dissolved in a specific solvent. is there. This lyotropic polymer cholesteric liquid crystal is such that the existence of such liquid crystal is basically known, and the interference colors (purple, indigo, blue, green, yellow, orange, and It is known that the color of red also changes reversibly with temperature, and that the temperature range for coloration depends on the concentration, molecular weight and type of solvent.

Therefore, the present inventors have paid attention to the specificity of a water solvent which does not occur in a general organic solvent (eg, acetone, ethanol, propylene glycol, etc.), that is, the hydrophobic bond, and have focused on the linear homopolysaccharide derivative and water. As a result of multi-faceted examination of a method for producing a laminated body having a lyotropic cholesteric liquid crystal composed of, it is possible to easily produce a laminated body of a liquid crystal having excellent coloration and transparency without directly touching a highly viscous liquid crystal. This has led to the proposal of a method and its laminates and windows using the laminates.

First, the liquid crystal used in the present invention is a high-concentration high-viscosity liquid consisting of a linear homopolysaccharide derivative, water, and an additive to be added in an appropriate amount if necessary, and is placed by its own weight by placing it sideways. It just flows little by little. The lamination method by handling this high-viscosity liquid crystal and placing it between the substrates and applying pressure spreads it when applying or coating the liquid crystal to the substrate or when placing the substrate on the placed liquid crystal. It is very difficult and practically impossible to manufacture without mixing air bubbles. . A small laminated body of a few centimeters square is still not practical for producing a large laminated body with a diameter of 1 m or more used for windows and the like. Further, for example, even if it is easy to defoam by a vacuum defoaming method, a thin film coating method, etc., it is not effective because the viscosity is too high, and a surface film is formed to make defoaming difficult and this film becomes uneven. The remaining. Further, bubbles are also mixed in the liquid crystal in the container left after handling, and once mixed, it is not practical because it is impossible to continue use because there is only an ascending method due to the difference in specific gravity that takes a long time. Further, it is generally said that there is no rational defoaming method for a high-viscosity solution composed of a low boiling point solvent. In the present invention, the term "bubbles" refers to microbubbles whose diameter is 1 mm or more, more strictly 0.5 mm or more, as long as the purpose of the present invention is to use a large size window or the like. Means bubbles. The liquid crystal stack with air bubbles
When it is used while leaning against visual noise, it moves in the stack due to the difference in specific gravity of air bubbles, and as a result, linear defects due to flow deformation are drawn along the trace of movement in the uniform liquid crystal layer to increase noise. However, since the moving speed of minute bubbles is very slow and the generation of linear defects is weak and thin, it is almost negligible. Naturally, it is optimal that there is no bubble at all.

A lyotropic cholesteric liquid crystal composed of a linear homopolysaccharide derivative and water has different interference colors (purple, indigo, blue, green, yellow, orange and red) depending on the concentration thereof, and also has cholesteric properties. The cloudy aggregation temperature at which the liquid crystal phase undergoes a phase transition to the cloudy aggregated phase also has a concentration dependency and a difference of about 4 ° C. For this reason, it is necessary to uniformly stack the liquid crystal in order to obtain a laminated body having uniform coloration and white turbidity change. Therefore, the present inventors have diligently studied a method of making this concentration uniform in multiple directions. For example, it can be easily obtained by weighing and stirring sufficiently, but as described above, it is not practical due to bubble treatment such as defoaming. We also examined a method of laminating a solid film of a linear homopolysaccharide derivative with water and changing it from liquid to liquid crystal by film diffusion of water that occurs over time, but even if it is devised such as heating, leaving it for 1 month, etc. Inevitably, a pale white haze was left in the liquid crystal phase to form a translucent laminate, and a transparent laminate could not be obtained. Therefore, as a result of intensive studies, the present inventors have paid attention to the fact that this liquid crystal is composed of a linear homopolysaccharide derivative and water. The manufacturing method of the present invention is capable of producing a laminated body. Further, it has been made possible to provide the laminate and a window using the laminate.

[0007]

The problem to be solved is to obtain a lyotropic cholesteric liquid crystal of a high-concentration aqueous solution containing a linear homopolysaccharide derivative and water, which has excellent coloration and transparency and is free of bubbles. The present invention establishes a method for manufacturing a laminated body that is laminated on a substrate in the state, and further provides the laminated body and a window using the laminated body.

[0008]

The present invention has been made to solve the above-mentioned problems, and a lyotropic cholesteric liquid crystal comprising a linear homopolysaccharide derivative and water is laminated on a substrate. In the method for producing a laminate, at least a part of which is transparent, a linear homopolysaccharide derivative and an aqueous solution of water are heated to cause clouding and aggregation of the linear homopolysaccharide derivative to deposit the aggregated precipitate on the substrate, Then, a method for producing a laminate comprising laminating opposing substrates, and a laminate in which a lyotropic cholesteric liquid crystal composed of a linear homopolysaccharide derivative and water is laminated on the substrate and at least a part of which is transparent , A linear homopolysaccharide derivative and an aqueous solution of water are heated to cause clouding and aggregation of the linear homopolysaccharide derivative, and the aggregate precipitate is deposited on the substrate, and then the counter substrate is laminated. In a window using a laminate characterized in that a lyotropic cholesteric liquid crystal consisting of a linear homopolysaccharide derivative and water is laminated on a substrate and at least a part of which can be seen through, a linear homopolysaccharide derivative and A window characterized by using a laminate formed by heating an aqueous solution of water to cause the linear homopolysaccharide derivative to become cloudy and aggregated, depositing the aggregated precipitate on a substrate, and then laminating opposing substrates It is provided.

In the production method of the present invention, an ordinary transparent general aqueous solution comprising a linear homopolysaccharide derivative, water and an additive such as a water-soluble electrolyte is heated to cause the linear homopolysaccharide derivative to cloud and aggregate. In this method, the aggregated sediment is deposited on the substrate to have a concentration indicating liquid crystal, and then the counter substrate is laminated. Observation of changes in the concentrations of linear homopolysaccharide derivatives and water shows that a solid film with only solvent water adsorbing water shows a light scattering state, and when a distant object is seen through this semitransparent film, the image Becomes unclear. When the following linear homopolysaccharide derivative is dissolved in water to form a liquid crystal state and its concentration is gradually lowered, a short wavelength violet wavelength is selectively scattered to give a purple color. In this state, since half of the violet wavelength is selectively reflected and all the remaining visible light is transmitted, a transparent coloring state is shown and a distant object can be visually recognized. This coloration shifts from purple to indigo, blue, green, yellow, orange, and red as the concentration decreases, and when it exceeds red, it is a colorless and transparent state visually, that is, a lyotropic type in which all visible light is transmitted. It becomes the cholesteric liquid crystal of. Interestingly, when the concentration is further reduced, the solution state becomes light scattering again, and the visibility of distant objects is greatly reduced. Above this scattering state, a normal transparent general aqueous solution is obtained. Although it depends on the molecular weight of the linear homopolysaccharide derivative, the additive of the water-soluble electrolyte, etc., it is usually a general aqueous solution at 50% by weight or more.

The aqueous solution comprising the linear homopolysaccharide derivative and water naturally has a reduced viscosity with a decrease in concentration and can be easily defoamed and uniformly dissolved. It should be noted here that not only low-concentration low-viscosity aqueous solutions but also high-concentration high-viscosity aqueous solutions are heated to rapidly increase the hydrophobic binding force between the molecules of the linear homopolysaccharide derivative, resulting in cloudiness. When it becomes a state of the minute random agglomerates, the liquid viscosity sharply decreases, and it becomes a free-flowing solution like an aqueous solution in which low molecules are dissolved.
Relatively large bubbles that are mixed in by stirring easily float and defoam. However, conversely, the air dissolved in the aqueous solution is generated as fine bubbles along with the heated aggregation. The bubbles have a diameter of 1 mm or less and can be ignored, but it is preferable to remove even fine bubbles. For example, a method of boiling by heating in a stirring state to combine fine bubbles with a large bubble by boiling to remove bubbles, a method of pulling out bubbles by depressurizing or boiling under reduced pressure in a heating stirring state, heating to cause cloudiness and aggregation After removing the clean water, add the same amount of water at the same temperature and stir,
Dissolve in water that has been degassed by decompression, etc., and then warm it to make it cloudy and dispersed. There is a method of transferring to water and replacing the warm water with fresh deaerated warm water, and stirring again to obtain a cloudy dispersed state. Stirring has the effect of finely dispersing the agglomerates and makes it easier to desorb microbubbles, and depressurization naturally accelerates the rise of the bubbles, and has the effect of drawing out by enclosing the microbubbles by foam bubbling at low temperature. Will be removed. Of course, these methods may be repeated twice or more, or may be used in combination, if necessary. The stirring here has a broad meaning and includes vibration, ultrasonic waves, and the like. Furthermore, it is more preferable to replace the air with an inert gas (eg, argon, nitrogen, etc.) as necessary during the dissolution to prevent oxidation.

Next, in the method of depositing the coagulated sediment on the substrate, the substrate is provided with an enclosure in a heated state, the white turbid dispersion liquid is poured into the substrate, the lid is left standing horizontally. After that, the aggregated sediment is deposited on the substrate and the aggregation proceeds until the liquid crystal concentration is reached. In order to reduce this sedimentation in a short time, it is effective to use centrifugal force to perform sedimentation separation. This step is also effective for removing bubbles because the solution is spread over a wide area. As a matter of course, the transparent aqueous solution may be poured onto the substrate at room temperature, and then heated together with the substrate to cause cloudy aggregation / precipitation. The cloudy aggregated precipitate may be dispersed by stirring and mixing once on the substrate. Furthermore, the water separated into layers on the cloudy aggregated sediment that has settled on the substrate is removed by suction or the like, and evaporation is added as necessary to bring the concentration of the cloudy aggregated sediment to a level at which the liquid crystal phase is obtained. May be. By uniformly promoting this evaporation, it is possible to form a liquid crystal layer having a uniform concentration, that is, coloration. When the water-soluble electrolyte is added, aggregation increases with the amount added, and it is preferable to deposit at a temperature lower than pure water (for example, purified water in Pharmacopoeia), for example, 50 or 60 ° C., to form a uniform deposition layer. Since pure water has a weak cohesive sedimentation force, it may be precipitated at a high temperature of 90 ° C. or higher, or at a high temperature of 100 ° C. or higher using a pressure vessel.
Further, the water does not need to be pure water, and may be ordinary tap water, ground water, or the like.

There are the following methods for laminating the counter substrate. The first is to stack the substrates on top of the warm water that has accumulated in layers on the warm white turbid aggregated sediment so that air bubbles do not come into contact with the water from the sides, and the water is applied by its own weight or light pressure. A method of gradually draining and stacking at the same time, this method is
When the aggregated sediment is cloudy, the viscosity is low, and a spacer or the like can be added to easily pressurize to a desired thickness. The second is a method in which the above temperature is changed to a coagulation sedimentation layer which exhibits a liquid crystal phase at room temperature instead of being heated, and then water is drained and laminated at the same time. Therefore, there is an advantage that defects such as cracks and water pools do not appear in the aggregated sedimentation layer during pressurization during lamination, and in order to adjust the thickness of the liquid crystal layer, it is necessary to press again under heating or hot water. You can easily.

The third method is a method of forming a cloudy cohesive sedimentation layer by heating and stacking it by evaporating excess water to a concentration at which a liquid crystal phase is obtained. In this method, a water-soluble electric field is used in the formation of the cloudy cohesive sedimentation layer. The smaller the amount of the added quality is, the more easily the white turbid aggregates are easily formed, and it is effective in that the amount of the added amount can be increased together with the evaporation of water. Further, when it is not particularly necessary to increase the added amount, it is advisable to absorb and remove clean water. Furthermore, if the layers are laminated in a heated state, the moisture content of the vapor works effectively even if there is no water layer, and the viscosity is low in the cloudy state, so that bubbles are not introduced by gradually contacting the substrate from the sides. It turns out that it can be laminated. Furthermore, it is more preferable to stack under saturated steam as a method for performing this method more reliably. In addition, this method changes the amount of the water-soluble electrolyte added to the liquid crystal layer by spraying an aqueous solution of the water-soluble electrolyte to change the temperature at which the liquid crystal phase transitions to the cloudy aggregate phase, the degree of cloudiness, and the coloration of the liquid crystal. It can be changed, and a laminate having a cloudy gradation or a colored pattern can be easily produced.

As described above, according to this stacking and laminating method, liquid crystal excellent in coloration and transparency, which is formed by warming aggregation and sedimentation, can be laminated in a bubble-free state without handling the liquid crystal. Is a manufacturing method. The uneven concentration and thin haze that may remain during manufacturing can be resolved by reheating after stacking or self-diffusion.

The water-soluble electrolyte can be used without particular limitation, and examples thereof include sodium chloride, potassium chloride, sodium sulfate, sodium nitrate, sodium acetate, sodium benzenesulfonate, and sodium 1-hexanesulfonate. is there. Among them, neutral salts or neutral states may be used in consideration of stability. The water-soluble electrolyte not only serves as an auxiliary agent for sedimentation and aggregation, but the phase transition temperature at which the liquid crystal state changes from a colored liquid crystal state to a cloudy aggregation state due to the ionic effect of the water-soluble electrolyte is compared to a liquid crystal without a water-soluble electrolyte. Then, a shift was made to the low temperature side. The degree of this shift temperature can be controlled by the concentration of the water-soluble electrolyte in the low-viscosity aqueous solution before aggregation and settling, and by this method the cloudiness onset temperature of the liquid crystal can be freely set and the phase transition temperature can be easily set to the room temperature range. I was able to lower it. The amount of the water-soluble electrolyte added to the aqueous solution may be about 0.01 to 10% by weight, preferably 0.1 to 5% by weight.
You can select from the range.

Due to the effect of this additive, not only the laminate which changes its color depending on the temperature of the natural environment, but also, for example,
When a liquid crystal that undergoes a phase transition at 35 ° C is laminated between flat glass (eg, heat-absorbing glass) and used for a window, especially when direct sunlight such as the western sun in summer hits the window glass, it is irradiated by solar radiation. As a result, the window glass of the part was selectively heated, and as a result, only the irradiated part was selectively clouded to shield light and prevent glare. The feature of this light shielding is that the stronger the irradiation, the higher the temperature of the irradiation surface and the more opaque it becomes. Further, this liquid crystal did not cause convection due to its high viscosity, and automatically changed automatically due to changes in the environment due to the intensity of direct sunlight, movement of the irradiation surface, and the like. This provides a window with an ideal blind that selectively and automatically shades only the illuminator. Further, it is needless to say that the laminated body using the plate glass with the transparent conductive film as the substrate can electrically control heat generation from transparent to opaque, and therefore, when used as a window, the indoor and outdoor conditions can be limited without depending on the environment. Can provide windows with electronic curtains. As a further application, for example, a fire alarm sensor which can set a cloudy window to a screen for image projection and a photocoupler to the window to catch a cloudy change in the laminate due to an abnormally high temperature in the room, etc., can be widely used. In addition, by selecting this concentration, the liquid crystal state is exhibited by supercooling at 0 ° C or lower, and the daytime operating temperature in the area requiring antiglare is 5 ° C to 30 ° C.
At about ℃, it is a colorless transparent substance in a non-liquid crystal state and is about 40
The present invention also includes a high-concentration aqueous solution that changes from white to cloudy.

More importantly, in the liquid crystal laminate according to the present invention, the selectivity of light scattering, which is directly related to the color saturation, which is the essence of the liquid crystal characteristics, that is, the color purity, becomes very good, and stirring mixing is performed. The liquid crystal obtained by the method showed a clearer bright coloration. Therefore, stable and inexpensive cellulose is selected as a representative example of the linear homopolysaccharide derivative, and hydroxypropyl cellulose obtained by reacting this cellulose with propylene oxide is selected, but is not particularly limited thereto, and water Any linear homopolysaccharide derivative having a liquid crystal state by mixing is preferable, and a cellulose derivative is also preferable from the viewpoint of stability. A lyotropic cholesteric liquid crystal composed of hydroxypropyl cellulose and water exhibits durability, vivid coloration, sufficient light-shielding property due to white turbid aggregation, is almost nontoxic, and is important from the viewpoint of safety.
As a typical example of a linear homopolysaccharide derivative, hydroxypropyl cellulose (average degree of polymerization is 175, 20% of 2% aqueous solution).
Viscosity of 8.5 cps at 6 ° C and hydroxypropyl group of 62.4%) was selected, and a liquid crystal consisting only of hydroxypropyl cellulose and water was laminated between plate glasses to obtain a circular dichroism dispersion meter J-720 of JASCO Corporation. Was used to measure the state of selective scattering of visible light at room temperature. As a result, the half-wave value of the liquid crystal laminate by the coagulation sedimentation method of the present invention is 17 nm. The value is ½ or less of the half-wave value (35 nm) of the liquid crystal laminate obtained by the stirring and mixing method, and it is clearly seen that the laminate according to the present invention has excellent selective scattering characteristics.
As a result, the laminate of the present invention splits visible light into reflected light with high saturation and transmitted light with high transparency, and exhibited clear bright coloration and transparency with high transparency. As a result, when the laminated body using the liquid crystal according to the present invention is used as a window, it is possible to obtain a good see-through property without being particularly blurry or cloudy when a bright view outside the room is seen in the daytime. That wasn't possible. Moreover, when this window was seen from a bright room, it showed a clear and bright coloration. The reason for this is considered to be that the liquid crystal prepared by the coagulation-sedimentation method has a uniform molecular alignment order because it forms a molecular coagulation from a thin aqueous solution having a low viscosity, and forms a defect-free monodomain.

The shape of the laminated body can be freely selected, and the size is not particularly limited, and it is sufficient that the laminated body has a transparent portion that allows a direct view of the inside. The substrate may be glass, resin, metal, ceramics, etc. without particular limitation. In particular, the glass may be laminated, laminated or tempered. Further, as a substrate having a light-heat conversion function, as a single plate having a high solar absorptivity, for example, iron, nickel, a heat ray absorbing plate glass colored by adding a metal such as cobalt, or a metal oxide film is coated, There is a heat ray reflective glass (not only reflection but also high absorption) in which a metal film is sputter coated. If necessary, the thickness of the liquid crystal layer may be controlled by a spacer. The spacer is preferably transparent and has its specific gravity and refractive index matched with that of the liquid crystal. After lamination, to prevent water evaporation,
The outer periphery may be wiped off and sealed with a sealant (for example, epoxy resin, tape with water-resistant adhesive, etc.).

In particular, by using this laminate for a window, an excellent window can be obtained. Examples of the windows include windows of ordinary buildings, vehicles such as automobiles and railway cars, and windows of transport planes such as aircraft and elevators. Of course, this window has a broad meaning, and includes a door with a window, a partition, etc., as well as a transparent glass door, a screen, and a wall.

The main subject of the present invention is a lyotropic cholesteric liquid crystal of a high-concentration aqueous solution containing a linear homopolysaccharide derivative and water, which is a liquid crystal having excellent coloration and transparency and free from bubbles. A description of the liquid crystal system is omitted because the method of production and the laminated body and window using the liquid crystal are used. Here, hydroxypropylcellulose obtained by reacting cellulose with propylene oxide was selected as a representative example of the linear homopolysaccharide derivative, but the invention is not particularly limited thereto. In addition, hydroxypropyl cellulose has a hydroxypropyl group ether-bonded to the main chain skeleton of cellulose, and is extremely strong in both weather resistance and heat resistance, and can be used in places with severe environmental conditions such as windows exposed to direct sunlight. It is also non-toxic and important in terms of safety and can be widely used for consumer products.

[0021]

【Example】

Example 1 Hydroxypropyl cellulose (average polymerization degree of 175,
A 2% aqueous solution having a viscosity at 20 ° C. of 8.5 cps and a hydroxypropyl group of 62.4%) and 0.5 parts by weight of a sodium chloride aqueous solution containing 50 parts by weight of purified water according to the pharmacopoeia 2
50 parts by weight was added and mixed sufficiently with stirring to form a uniform aqueous solution. When this aqueous solution was heated to 78 ° C. and hydroxypropyl cellulose was clouded and aggregated, the solution was stirred and kept in a cloudy dispersed state for 1 hour. Then, the cloudy dispersion solution was poured to a height of 8 mm on a 10 cm square glass plate of 10 mm thickness at 74 ° C having a rubber stopper on the outer periphery and left horizontally in a closed chamber for 3 days, and then a glass plate of the same size was placed on top. At the same time, the water was separated into layers to remove the clean water to obtain a laminate. Then, this laminated body was naturally cooled to room temperature and the outer periphery was wiped and dried. Further, the four sides of the outer periphery were sealed with a U-shaped aluminum frame having a room temperature curing type epoxy resin.

[0022]

Example 2 Hydroxypropyl cellulose (average degree of polymerization of 175,
A 2% aqueous solution having a viscosity at 20 ° C. of 8.5 cps and a hydroxypropyl group of 62.4%) and a 0.1% by weight sodium chloride aqueous solution containing 50 parts by weight of purified water according to the pharmacopoeia 2
50 parts by weight was added and mixed sufficiently with stirring to form a uniform aqueous solution. When this aqueous solution was heated to 93 ° C. and hydroxypropyl cellulose was clouded and aggregated, the solution was stirred and kept in a cloudy dispersed state for 1 hour. Next, the cloudy dispersion solution was poured to a height of 4 mm on a 3 mm thick 10 cm square glass plate at 82 ° C. with a rubber stopper on the outer periphery, and the mixture was allowed to stand horizontally for 1 day in a closed chamber, and then the layered clean water was absorbed. The liquid crystal was eliminated and gradually dried at 60 ° C. to obtain a liquid crystal concentration. Substrates of the same size were gradually stacked on top of this state while avoiding inclusion of bubbles from the sides to form a laminate. After that, sealing was performed in the same manner as in Example 1.

[0023]

【Example】

Example 3 Hydroxypropyl cellulose (average degree of polymerization: 175,
A 2% aqueous solution having a viscosity at 20 ° C. of 8.5 cps and a hydroxypropyl group of 62.4%) and a 3% by weight sodium chloride aqueous solution of 50 parts by weight of purified water according to the pharmacopoeia 250
Parts by weight were added and mixed thoroughly with stirring to form a uniform aqueous solution. When this aqueous solution was heated to 57 ° C. and hydroxypropyl cellulose was clouded and aggregated, the solution was stirred and kept in a cloudy dispersed state for 30 minutes. Then, the cloudy dispersion solution was poured to a height of 7 mm on a 10 cm square glass plate with a thickness of 10 mm and having a liquid stopper on the outer periphery and kept at 51 ° C., and the glass plate of the same size was placed on the glass plate of the same size. At the same time, the water was separated into layers to remove the clean water to obtain a laminate. After that, sealing was performed in the same manner as in Example 1.

[0024]

【Example】

Example 4 The same procedure as in Example 3 was carried out. After leaving it horizontally in a closed room for 2 days, the temperature was returned to room temperature and the liquid crystal coloration state was confirmed. Then, glass plates of the same size were overlaid and the layers were separated at the same time. Water was removed to obtain a laminate. After that, sealing was performed in the same manner as in Example 1.

[0025]

INDUSTRIAL APPLICABILITY As described above, the present invention is a laminate having a lyotropic cholesteric liquid crystal of a highly concentrated aqueous solution containing a linear homopolysaccharide derivative having excellent coloration and transparency and having no bubbles, and water. We have obtained a method that can easily produce the body. The laminate having the liquid crystal of the present invention splits visible light into reflected light with high saturation and transmitted light with high transparency, and showed clear bright coloration and transparency with high transparency. As a result, when the laminated body using the liquid crystal according to the present invention is used as a window, a bright view outside the room during the daytime does not cause particular blurring or clouding, and good transparency can be obtained. The window showed a clear, bright coloration. In addition, we were able to provide a window with an ideal blind in which only the irradiation surface of direct sunlight became cloudy selectively and the light was automatically changed.

Claims (5)

[Claims] 1. A method for producing a laminate in which a lyotropic cholesteric liquid crystal comprising a linear homopolysaccharide derivative and water is laminated on a substrate and at least a part of which is transparent,
It is characterized in that a linear homopolysaccharide derivative and an aqueous solution of water are heated to cause clouding and aggregation of the linear homopolysaccharide derivative and the aggregated sediment is deposited on the substrate, and then the opposing substrate is laminated. Method for manufacturing laminated body. 2. The method according to claim 1, wherein the linear homopolysaccharide is cellulose. 3. The aqueous solution contains 0.01 to 1 of a water-soluble electrolyte.
The manufacturing method according to claim 1 or 2, wherein 0% by weight is added. 4. A laminate in which a lyotropic cholesteric liquid crystal composed of a linear homopolysaccharide derivative and water is laminated on a substrate and at least a part of which is transparent, and the aqueous solution of the linear homopolysaccharide derivative and water is heated. Then, the linear homopolysaccharide derivative is clouded and aggregated, the aggregated precipitate is deposited on the substrate, and then the opposing substrate is laminated. 5. A window using a laminate in which a lyotropic cholesteric liquid crystal composed of a linear homopolysaccharide derivative and water is laminated on a substrate and at least a part of which is transparent, in an aqueous solution of the linear homopolysaccharide derivative and water. A window characterized by using a laminate comprising a linear homopolysaccharide derivative that is clouded and aggregated by heating, and the aggregated precipitate is deposited on a substrate, and then opposing substrates are laminated.