JP5434741B2 - Transparent insulating composition - Google Patents

Description

  The present invention relates to a transparent insulating composition useful as a component of an optical element.

  The transparent insulating composition is optically transparent and is defined as a fluid material having a relatively high specific resistance, and is used as a constituent member of various optical elements by taking advantage of its optical characteristics. For example, it can be effectively used in the case of a liquid crystal display element having a structure in which two STN (super twisted nematic type) display elements are bonded for optical compensation. That is, when a gap is generated between the two display elements, the optical characteristics are deteriorated because there is a difference between the refractive index of air (about 1.0) and the refractive index of glass on the display element surface (around 1.5). By injecting a transparent insulating composition having a refractive index relatively close to that of glass into the gap, deterioration of optical properties can be suppressed. Also, in general, the display part of a mobile phone is covered with tempered glass or an acrylic plate as a cover to protect the internal display element, and a clearance (air gap) is provided between the liquid crystal display element and the cover, so that the external display element can be protected. Even when the cover is broken by an impact or the like, a structure (air gap structure) for protecting the liquid crystal display element is adopted. Even in this case, it can be used for the purpose of suppressing the deterioration of the optical characteristics due to the difference in refractive index in the air gap. Furthermore, a touch panel widely applied to information terminals in recent years has a structure having a pointing device as an input device and a liquid crystal display element as a display device at the same time. In this case, the same problem occurs between the display element and the pointing device. It can be used as a means to solve.

  On the other hand, there are several types of touch panels, and in the method of detecting contact between two substrates arranged in opposition by the pressure of a matrix switch type or resistance type pen, etc. It has a structure in which a gap is arranged between the substrates. Even in this case, the display characteristics deteriorate due to the influence of the gap in the touch panel. That is, when it has a structure in which a gap is interposed between the electrode substrates, the refractive index of the refractive index of glass used as the electrode substrate (1.5 or more) and the refractive index of air (about 1.0). Due to this difference, there is a problem in that the light transmittance is lowered, the characteristics of the display device are deteriorated, and further, the display quality is deteriorated due to the generation of interference fringes when inputting with a pen or the like.

  There have been reported attempts to improve optical characteristics by enclosing a liquid having a refractive index close to that of glass or the like in a gap present in an optical element. For example, the above problem is solved by encapsulating silicone oil in a gap between electrodes of a resistance type touch panel (see Patent Document 1). There have been reported ones in which methylene iodide is sealed in voids (see Patent Document 2) and those in which fluorine-containing hydrocarbons are sealed in voids (see Patent Document 3). However, silicone oil has a refractive index of 1.4, which is lower than that of glass, so that a sufficient effect cannot be obtained. Methylene iodide is highly effective in improving optical properties, but methylene iodide is poor in stability and short. In addition to deterioration over time and high toxicity, it was impossible to say that it was a practical material. In addition, although the fluorine-containing hydrocarbon is excellent in terms of stability, it has a problem that the refractive index is 1.3 or less.

  Further, when used for the gap of the touch panel, high insulation is also required for the liquid to be sealed in order not to impair the detection accuracy due to the difference in resistance. However, the above-described embodiment using methylene iodide has a problem of insufficient insulation.

  In the various uses as described above, there is no transparent insulating composition that satisfies various characteristics, and development of such a composition has been desired.

JP 2000-173394 A (Example 1) JP-A-9-185457 (Example) Japanese Patent Laid-Open No. 10-133819 (Claims, Examples)

  An object of the present invention is to provide a transparent insulating liquid having a refractive index of about 1.5, which is close to the refractive index of glass, high insulating properties and high stability, and the transparent insulating composition as a constituent member. An object is to provide a touch panel with high transmittance.

As a result of intensive studies to solve the above problems, the inventors of the present application contain a specific liquid crystal compound and do not exhibit a liquid crystal phase in a general operating temperature range, As a result, the present invention was completed.
The present invention relates to the general formula (Ik) from the general formula (Ia)

(In the formula, any hydrogen atom is represented by an alkyl group having 1 to 15 carbon atoms, an alkyl group having 1 to 15 carbon atoms substituted by at least one halogen, an alkenyl group having 2 to 15 carbon atoms, or at least one halogen. Represents a substituted alkenyl group having 2 to 15 carbon atoms, a cyano group, a fluorine atom, a chlorine atom, a trifluoromethyl group, a trifluoromethoxy group, a difluoromethoxy group, or a difluoromethyl group, in the alkyl group or alkenyl group. One or two or more CH ₂ groups present in each independently represent -O-, -S-, -CO-, -COO-, -OCO- or -OCO A compound having a molecular weight of 120 to 400, a melting point of 0 ° C. or less, and a melting point of the composition of 0 ° C. or less. Transparent insulating composition characterized by To provide a display device provided with the touch panel and touch panel and components of the composition.

  Since the transparent insulating composition of the present invention has a refractive index of about 1.5, which is close to the refractive index of glass, high insulation and high stability, it can be transmitted by being used for touch panels such as matrix switch type and resistance type. In addition to the touch panel, it is useful for various applications that require a high refractive index and insulation.

It is sectional drawing of the conventional touch panel. It is sectional drawing of the touchscreen of this invention.

1 Upper glass substrate (touch side)
2 Lower glass substrate 3 Transparent conductive film 4 Void 5 Seal material 6 Transparent insulating composition layer

  The transparent insulating composition of the present invention is characterized in that the melting point of the composition is 0 ° C. or lower, but the melting point is preferably −10 ° C. or lower, more preferably −20 ° C. or lower. The melting point is particularly preferably −30 ° C. or lower. Depending on the properties of the compound used, there is a possibility that a liquid crystal phase is developed. However, when the liquid crystal phase is developed, light scattering occurs and the transmittance is greatly reduced, which is not preferable.

  The mass average molecular weight is preferably 100 or more and 500 or less, preferably 100 or more and 400 or less, more preferably 100 or more and 350 or less, and particularly preferably 150 or more and 350 or less.

The composition of the present invention needs to have at least one substituent in these ring structures as the compounds represented by the general formula (Ia) to the general formula (Ik) having only one ring structure. It preferably has two substituents. In this case, the two substituents may be the same or different, but are preferably different. Moreover, although there is no restriction | limiting in the position of two substituents, in the case of a 6-membered ring compound, it is preferable that it is substituted by para position or meta position, and para position is more preferable. In the case of a naphthalene ring, it is preferably substituted at the 2 and 7 positions.
More specifically, the compound represented by the general formula (II) is represented by the general formula (Ia) to the general formula (Ik).

（式中、Ｒ^１及びＲ^２はそれぞれ独立して、水素原子、炭素数1〜15のアルキル基、少なくとも一つのハロゲンにより置換された炭素数1〜15のアルキル基、炭素数2〜15のアルケニル基又は少なくとも一つのハロゲンにより置換された炭素数2〜15のアルケニル基、シアノ基、フッ素原子、塩素原子、トリフルオロメチル基、トリフルオロメトキシ基、ジフルオロメトキシ基、又はジフルオロメチル基を表し、該アルキル基又はアルケニル基中に存在する1個又は2個以上のCH₂基はそれぞれ独立してO原子が相互に直接結合しないものとして -O-、-S-、-CO-、-COO-、-OCO-又は-OCO-O-により置き換えられても良く、
Ａは、一般式(Ia-1)から一般式(Ik-1)

Wherein R ¹ and R ² are each independently a hydrogen atom, an alkyl group having 1 to 15 carbon atoms, an alkyl group having 1 to 15 carbon atoms substituted by at least one halogen, or 2 to 15 carbon atoms. An alkenyl group or an alkenyl group having 2 to 15 carbon atoms substituted by at least one halogen, a cyano group, a fluorine atom, a chlorine atom, a trifluoromethyl group, a trifluoromethoxy group, a difluoromethoxy group, or a difluoromethyl group; One or two or more CH ₂ groups present in the alkyl group or alkenyl group are independently defined as those in which O atoms are not directly bonded to each other. -O-, -S-, -CO-, -COO- , -OCO- or -OCO-O-
A represents the general formula (Ik-1) from the general formula (Ia-1)

(The arbitrary hydrogen atom in the formula represents a structure selected from a skeleton represented by an alkyl group having 1 to 5 carbon atoms, a fluorine atom or a chlorine atom).
However, the case where R ¹ and R ² simultaneously become hydrogen atoms is excluded. It is preferable to contain the compound represented by this. In this case, only one ring means both a ring structure composed of a single ring and a ring structure in which several rings are condensed to form a single condensed ring.

In the general formula (II), R ¹ and R ² represent a side chain group of a ring structure, but when these substituents are the same, the case where they represent different substituents causes crystal precipitation. It is desirable from the viewpoint of avoidance. In particular, in R ¹ and R ² , when the side chain length is short, it is preferable that these side chains are different from those in the same case. Specifically, in the case where R ¹ and R ² represent an alkyl group having 1 to 8 carbon atoms or an alkoxy group having 1 to 8 carbon atoms, it is preferable that they are different, and R ¹ and R ² are carbon numbers. When it represents a 1-5 alkyl group or a C1-C5 alkoxy group, it is more preferable that these differ. R ¹ is preferably an alkyl group having 1 to 15 carbon atoms, an alkenyl group having 2 to 15 carbon atoms or an alkoxy group having 1 to 15 carbon atoms, and an alkyl group having 3 to 15 carbon atoms or 3 carbon atoms. A C15-C15 alkenyl group or a C3-C15 alkoxy group is more preferable, and a C6-C15 alkyl group, a C6-C15 alkenyl group, or a C6-C15 alkoxy group is still more preferable.

R ² is a cyano group, a fluorine atom, a chlorine atom, a trifluoromethyl group, a trifluoromethoxy group, a difluoromethoxy group, a difluoromethyl group, an alkyl group having 1 to 15 carbon atoms, or an alkyl group having 2 to 15 carbon atoms under the above conditions. Or an alkoxy group having 1 to 15 carbon atoms, preferably a cyano group, a fluorine atom, a chlorine atom, a trifluoromethyl group, a trifluoromethoxy group, a difluoromethoxy group, a difluoromethyl group, or an alkyl group having 3 to 15 carbon atoms. More preferably, an alkenyl group having 3 to 15 carbon atoms or an alkoxy group having 3 to 15 carbon atoms, a cyano group, a fluorine atom, a chlorine atom, a trifluoromethyl group, a trifluoromethoxy group, a difluoromethoxy group, a difluoromethyl group, carbon. An alkyl group having 6 to 15 carbon atoms, an alkenyl group having 6 to 15 carbon atoms or an alkyl group having 6 to 15 carbon atoms A alkoxy group is more preferred, and a fluorine atom is particularly preferred.

From the above, as a combination of R ¹ and R ² , R ¹ represents an alkyl group having 6 to 15 carbon atoms, an alkenyl group having 6 to 15 carbon atoms, or an alkoxy group having 6 to 15 carbon atoms, and R ² represents a fluorine atom. , A trifluoromethyl group, a trifluoromethoxy group, a difluoromethoxy group or a difluoromethyl group, R ¹ preferably represents an alkyl group having 6 to 15 carbon atoms, and R ² particularly preferably represents a fluorine atom.
Ring A is represented by the following general formula (Ia-1) to general formula (Ik-1)

（式中の任意の水素原子は、炭素原子数１から５のアルキル基、フッ素原子又は塩素原子により置換されていても良い。）からなる群より選ばれる骨格がより好ましい。

A skeleton selected from the group consisting of (any hydrogen atom in the formula may be substituted by an alkyl group having 1 to 5 carbon atoms, a fluorine atom or a chlorine atom) is more preferred.

  Among these, general formula (1a-1), general formula (1a-2), general formula (1c-1), general formula (1e-1) or general formula (1f-1) is more preferable, and general formula (1a-1) -1), general formula (1c-1), or general formula (1e-1) is more preferable, and general formula (1a-1) is particularly preferable.

  The compound represented by the general formula (II) needs to have a molecular weight of 120 or more and 400 or less, preferably 120 or more and 350 or less, more preferably 150 or more and 350 or less, and 150 or more and 300 or less. It is particularly preferred.

The content of the compound represented by the general formula (II) is preferably at least 5% by mass, more preferably 15% by mass or more, further preferably 35% or more, particularly preferably 60% or more, and the upper limit is Although it may be composed of 100%, it is preferably 90% or less, more preferably 80% or less.
The number of compounds represented by the general formula (II) contained is preferably 2 or more, more preferably 2 or more and 10 or less.

(Compounds that can be used in addition to general formula (II))
In the transparent insulating composition of the present invention, a compound having two or three rings can be added as other components excluding the necessary content of the compound represented by the general formula (II).
Specifically, general formula (IIIa) or general formula (IIIb)

（式中、Ｒ^３及びＲ^４はそれぞれ独立して、水素原子、炭素数1〜15のアルキル基、少なくとも一つのハロゲンにより置換された炭素数1〜15のアルキル基、炭素数2〜15のアルケニル基又は少なくとも一つのハロゲンにより置換された炭素数2〜15のアルケニル基、シアノ基、フッ素原子、塩素原子、トリフルオロメチル基、トリフルオロメトキシ基、ジフルオロメトキシ基、又はジフルオロメチル基を表し、該アルキル基又はアルケニル基中に存在する1個又は2個以上のCH₂基はそれぞれ独立してO原子が相互に直接結合しないものとして -O-、-S-、-CO-、-COO-、-OCO-又は-OCO-O-により置き換えられても良く、

Wherein R ³ and R ⁴ are each independently a hydrogen atom, an alkyl group having 1 to 15 carbon atoms, an alkyl group having 1 to 15 carbon atoms substituted with at least one halogen, or an alkyl group having 2 to 15 carbon atoms. An alkenyl group or an alkenyl group having 2 to 15 carbon atoms substituted by at least one halogen, a cyano group, a fluorine atom, a chlorine atom, a trifluoromethyl group, a trifluoromethoxy group, a difluoromethoxy group, or a difluoromethyl group; One or two or more CH ₂ groups present in the alkyl group or alkenyl group are independently defined as those in which O atoms are not directly bonded to each other. -O-, -S-, -CO-, -COO- , -OCO- or -OCO-O-

B ¹ , B ² and B ³ are each independently
(a) trans-1,4-cyclohexylene group (one CH ₂ group present in this group or two or more non-adjacent CH ₂ groups are replaced by -O- and / or -S- (May be)
(b) 1,4-phenylene group (one CH ₂ group present in this group or two or more non-adjacent CH ₂ groups may be replaced by -N-)
(c) 1,4-cyclohexenylene, 1,4-bicyclo (2.2.2) octylene, piperidine-1,4-diyl, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl and 1 , 2,3,4-tetrahydronaphthalene-2,6-diyl, and the groups (a), (b) and (c) are methyl, ethyl, CN or May be substituted with halogen,
L ¹ represents a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —COO—, —OCO— or —C≡C—. ) Can be included.

General formula (IIIa) and general formula (IIIb) include compounds having various substituents. Specifically, the following embodiments are preferred.
B ¹ , B ² or B ³ is preferably a ring structure represented by the following formulas (1a) to (1i).

(In these ring structures, except for the formulas (1c) and (1f), a hydrogen atom in the formula may be substituted with a fluorine atom.)
Among these, formula (1a), formula (1c), formula (1f) or formula (1g) is more preferred, formula (1a), formula (1c) or formula (1f) is more preferred, formula (1a) or formula (1f) (1c) is particularly preferred.

In these ring structures, when B ¹ , B ² or B ³ is a six-membered ring, it is preferably substituted at the para-position or meta-position, more preferably the para-position. In the case of a naphthalene ring, it is preferably substituted at the 2 and 7 positions.

R ³ and R ⁴ each represent a side chain group of the liquid crystal compound. In the case where these substituents are different from each other, it is desirable from the viewpoint of avoiding crystal precipitation.
R ³ is preferably an alkyl group having 1 to 15 carbon atoms, an alkenyl group having 2 to 15 carbon atoms, or an alkoxy group having 1 to 15 carbon atoms, and more preferably an alkyl group having 1 to 15 carbon atoms.

R ⁴ is an alkyl group having 1 to 15 carbon atoms, an alkenyl group having 2 to 15 carbon atoms, an alkoxy group having 1 to 15 carbon atoms, a cyano group, a fluorine atom, a chlorine atom, a trifluoromethyl group, a trifluoromethoxy group, It preferably represents a difluoromethoxy group, a difluoromethyl group or a hydrogen atom, more preferably represents a fluorine atom, a trifluoromethyl group, a trifluoromethoxy group, a difluoromethoxy group or a difluoromethyl group, and particularly preferably a fluorine atom.

From the above, as a combination of R ³ and R ⁴ , R ³ represents an alkyl group having 1 to 15 carbon atoms, an alkenyl group having 2 to 15 carbon atoms, or an alkoxy group having 1 to 15 carbon atoms, and R ⁴ represents a fluorine atom. , Preferably a trifluoromethyl group, a trifluoromethoxy group, a difluoromethoxy group or a difluoromethyl group, particularly preferably R ³ represents an alkyl group having 1 to 15 carbon atoms and R ⁴ represents a fluorine atom.
L ¹ or L ² is preferably a single bond, —CH ₂ CH ₂ —, —COO— or —OCO—, but in general formula (IIIb), one of L ¹ and L ² must be a single bond. Is preferred.

  Of the general formulas (IIIa) and (IIIb), the general formula (IIIb) having a larger number of rings is more preferable because the general formula (IIIa) is more easily precipitated than the general formula (IIIa). .

  From such a viewpoint, as a more specific and preferable form of the compounds of the general formula (IIIa) and the general formula (IIIb), compounds represented by the following general formulas (III-1) to (III-11) are: preferable.

(In the formula, R ¹ represents an alkyl group having 1 to 15 carbon atoms, an alkenyl group having 2 to 15 carbon atoms, or an alkoxy group having 1 to 15 carbon atoms, and R ² represents an alkyl group having 1 to 15 carbon atoms and a carbon number. Represents an alkenyl group having 2 to 15 carbon atoms, an alkoxy group having 1 to 15 carbon atoms, a fluorine atom, a trifluoromethyl group, a trifluoromethoxy group, a difluoromethoxy group, or a difluoromethyl group, and X ¹ , X ² , X ³ , X ⁴ , X ⁵ , X ⁶ , X ⁷ and X ⁸ each independently represents a hydrogen atom, a methyl group or a fluorine atom.)
Among these, general formulas (III-1) to (III-8) are preferable, and general formulas (III-1) to (III-5) are more preferable.
Moreover, as a compound which has three rings, the compound represented by the following general formula (III-12)-(III-23) is preferable.

(Wherein R ¹ represents an alkyl group having 1 to 15 carbon atoms, and R ² represents an alkyl group having 1 to 15 carbon atoms, a fluorine atom, a trifluoromethyl group, a trifluoromethoxy group, a difluoromethoxy group, or a difluoromethyl group. X ¹ , X ² , X ³ , X ⁴ , X ⁵ , X ⁶ , X ⁷ and X ⁸ each independently represents a hydrogen atom, a methyl group or a fluorine atom.)
When the compound represented by the general formula (III) is contained, the content is preferably 30% or less, more preferably 20% or less, and particularly preferably 10% or less.

In addition, a stabilizer can be added to the transparent insulating composition of the present invention in order to improve its storage stability. Examples of the stabilizer that can be used include hydroquinone, hydroquinone monoalkyl ethers, tert-butylcatechols, pyrogallols, thiophenols, nitro compounds, β-naphthylamines, β-naphthols, nitroso compounds, and the like. . When the stabilizer is used, the amount added is preferably in the range of 0.005 to 1%, more preferably 0.02 to 0.5%, based on the total amount of the composition.
Further, an antistatic agent for preventing charging and a polymer or polymerizable compound for adjusting the viscosity can be further added.

  The transparent insulating composition of the present invention can be used for various applications that require transparency and insulation, for example, two liquid crystal display elements having a structure in which two STN display elements are bonded for optical compensation. There are filling of the gap between the display elements, filling of the air gap provided in the protective cover of the display element and the liquid crystal display element, a touch panel, etc., but it is preferable to use as a touch panel. There are several types of touch panels that can be used for any type of touch panel. However, the touch panel detects that two substrates are in contact with each other by the pressure of a matrix switch type or resistance type pen. It can be particularly preferably used for filling the gap in the system.

The transmittance when configured as a touch panel is preferably high, but a practical value is preferably 90% or more.
A touch panel comprising the transparent insulating composition of the present invention as a constituent member can impart a function as a touch sensor to the display element as a constituent member of various display elements.

  Furthermore, since the transparent insulating composition of the present invention has properties as an insulating liquid, it is used as an insulating oil for vehicle transformers and capacitors, an insulating oil for OF (Oil Filled) cables, and an encapsulated insulating material for electronic components such as transistors. Coupling oil for fluid couplings such as oil, fan coupling oil and viscous coupling oil, circuit breakers, diesel engines, door checkers, damper oils for electronics and vehicles and aircraft instruments, optical machines such as cameras, sewing machines, editing Lubricating oil for precision machinery such as machine, impregnating oil for non-lubricated bearings made of rivets and plastics, oil baths for chemical plants and chemical laboratories, mold release for molding rubber and plastic, manufacture of molds for shell molds, die casting It can be used for purposes such as mold release agents during molding and toner adhesion prevention oil for PPC copying machines.

Hereinafter, although an example is given and this invention is further explained in full detail, this invention is not limited by these. “%” Means “% by mass”.
T _NI : Nematic phase-isotropic liquid phase transition temperature (° C) is the liquid crystal phase upper limit temperature n: Refractive index at 25 ° C η: Viscosity at 20 ° C (Pa · s)
R: Specific resistance at 25 ° C (Ωcm)
Stability test:
The transparent insulating composition to be tested is allowed to stand at 150 ° C. for 1 hour, or after an irradiation test for 30 minutes with a light resistance tester, the decomposition of the compound constituting the composition is observed, the transmittance decreases, or A case where a decrease in specific resistance was observed was rated as x, and a case where there was no problem in any test was marked as ◯.

Insulating property: After injecting the transparent insulating composition to be tested into the touch panel having the configuration shown in FIG. 2, the specific resistance is measured, and when it is 1 × 10 ¹¹ Ωcm or more, the result is ○, and 1 × 10 ¹¹ When less than Ωcm, ×

(Examples 1 to 5)
Transparent insulating compositions (M-1) to (M-5) were prepared using a compound selected from the group of monocyclic compounds consisting of the following general formulas (II-1a) and (II-1b). .
The molecular weights of these compounds are shown in the formula.

Further, the melting points of the compounds represented by the general formulas (II-1a) to (II-1b) were all not higher than -20 ° C.
The composition and physical property values of these compositions are shown in Table 1 below.

These transparent insulating compositions had a low liquid crystal phase lower limit temperature, a refractive index of about 1.5, which is close to the refractive index of glass, and a low viscosity.
(Examples 6 to 8)
A touch panel having the configuration shown in FIG. 2 was produced, and various types were used using (M-1), (M-2) or (M-3) produced in Examples 1, 2, or 3 as the transparent insulating composition. The characteristics were measured and the results are shown in Table 2.

(Comparative Example 1)
The touch panel shown in FIG. 1 was prepared, various characteristics were measured, and the results are shown in Table 2. In Comparative Example 1, the measurement was performed under the condition that air exists in the gap.
(Comparative Example 2)
Similarly to Example 3, a touch panel having the configuration shown in FIG. 2 was prepared, and various properties were measured using methylene iodide instead of the transparent insulating composition, and the results are shown in Table 1.
(Comparative Example 3)
As in Example 3, a touch panel having the configuration shown in FIG. 2 was prepared, and various characteristics were measured using silicone oil instead of the transparent insulating composition, and the results are shown in Table 1.
(Comparative Example 4)
Similarly to Example 3, a touch panel having the configuration shown in FIG. 2 was prepared, and PF-5080 (trade name of Sumitomo 3M Co., Ltd., C ₈ F ₁₈ ) which is a fluorinated hydrocarbon instead of the transparent insulating composition. And the results are shown in Table 2.

From the measurement results of Table 2, in the touch panel of Comparative Example 2 using methylene iodide instead of the transparent insulating material, although the refractive index of methylene iodide is relatively large, the stability is poor. The transmittance due to coloring was greatly reduced, and the insulation was low.
The touch panels of Comparative Examples 3 and 4 using silicone oil or fluorinated hydrocarbon have no problem in stability, but have a problem that the transmittance of the panel is not sufficiently high because the refractive index is low.
Compared with these, the touch panels of Examples 3 to 5 which are touch panels of the present invention have a high transmittance and excellent stability and other characteristics because the refractive index is close to that of glass used as a substrate. it is obvious.

(Examples 9 to 11)
Using a compound selected from the group of monocyclic compounds consisting of the general formula (II-1a), general formula (II-1b) and general formula (II-1c), from the transparent insulating composition (M-6) ( M-8) was prepared.
The composition and physical property values of these compositions are shown in Table 3 below.

これらの透明絶縁性組成物は、液晶相下限温度が低く、その屈折率もガラスの屈折率に近い１．５程度の屈折率を有し、又、粘性も低いものであった。

These transparent insulating compositions had a low liquid crystal phase lower limit temperature, a refractive index of about 1.5, which is close to the refractive index of glass, and a low viscosity.

(Examples 12 to 16)
The compound is selected from the group consisting of the general formula (II-1a), the general formula (II-1b), the general formula (II-1c), the general formula (III-1a) and the general formula (III-1a). A transparent insulating composition (M-9) to (M-13) was prepared using the compound.
The composition and physical property values of these compositions are shown in Table 4 below.

これらの透明絶縁性組成物は、液晶相下限温度が低く、その屈折率もガラスの屈折率に近い１．５程度の屈折率を有し、又、粘性も低いものであった。

These transparent insulating compositions had a low liquid crystal phase lower limit temperature, a refractive index of about 1.5, which is close to the refractive index of glass, and a low viscosity.

(Examples 17 to 21)
Using the following compounds, transparent insulating compositions (M-14) to (M-18) were produced in the same manner as in Example 1.

これらの組成物の組成及び物性値を以下の表５に示す。

The compositions and physical properties of these compositions are shown in Table 5 below.

(Examples 22 to 28)
Using the compound, transparent insulating compositions (M-19) to (M-25) were produced in the same manner as in Example 1.
The composition and physical property values of these compositions are shown in Table 6 below.

(Examples 29 to 35)
Using the compound, a transparent insulating composition (M-26) to (M-32) was produced in the same manner as in Example 1.
The composition and physical property values of these compositions are shown in Table 7 below.

This composition had a liquid crystal phase lower limit temperature as low as −27 ° C. and a refractive index of 1.383, which was close to the refractive index of glass. Also, the viscosity was as low as 14.3.

Claims (9)

Formula (Ia)

(In the formula, at least one hydrogen atom is an alkyl group having 1 to 15 carbon atoms, an alkyl group having 1 to 15 carbon atoms substituted with at least one halogen, an alkenyl group having 2 to 15 carbon atoms, or at least one One of alkenyl group having 2 to 15 carbon atoms substituted by a halogen, a cyano group, a fluorine atom, a chlorine atom, a trifluoromethyl group, a trifluoromethoxy group, a substituted difluoromethoxy group, or a difluoromethyl group, the alkyl group or One or two or more CH ₂ groups present in an alkenyl group are each independently defined as those in which O atoms are not directly bonded to each other, -O-, -S-, -CO-, -COO-, -OCO- Or a compound having a molecular weight of 120 or more and 400 or less and a melting point of 0 ° C. or less , or a melting point of the composition containing the compound. Is below 0 ° C A touch panel for a structure member transparent insulating composition characterized. The touch panel according to claim 1, wherein the compound represented by the general formula (Ia) has a molecular weight of 150 or more and 350 or less . The compound represented by the general formula (Ia) is represented by the general formula (II)

Wherein R ¹ and R ² are each independently a hydrogen atom, an alkyl group having 1 to 15 carbon atoms, an alkyl group having 1 to 15 carbon atoms substituted by at least one halogen, or 2 to 15 carbon atoms. An alkenyl group or an alkenyl group having 2 to 15 carbon atoms substituted by at least one halogen, a cyano group, a fluorine atom, a chlorine atom, a trifluoromethyl group, a trifluoromethoxy group, a difluoromethoxy group, or a difluoromethyl group; One or two or more CH ₂ groups present in the alkyl group or alkenyl group are independently defined as those in which O atoms are not directly bonded to each other. -O-, -S-, -CO-, -COO- , be replaced -OCO- or by -OCO-O- rather good,
A represents the general formula (Ia-1)

(The arbitrary hydrogen atom in the formula represents a structure selected from a skeleton represented by an alkyl group having 1 to 5 carbon atoms, a fluorine atom or a chlorine atom), provided that R ¹ And R ² are simultaneously hydrogen atoms. The touch panel according to claim 1, wherein the content is at least 5% . The touch panel according to claim 3, wherein R ¹ and R ² in the general formula (II) represent different substituents . The touch panel according to claim 3, comprising at least two types of compounds represented by formula (II) . The touch panel according to any one of claims 1 to 5, wherein the transparent insulating composition has a mass average molecular weight of 100 or more and 400 or less . The touch panel according to claim 1, wherein the transparent insulating composition has a viscosity of 40 Pa · s or less and a specific resistance of 1 × 10 ¹⁰ Ωcm or more . The touch panel according to any one of claims 1 to 7, wherein the transmittance is 90% or more . Display device provided with the touch panel according to any of claims 1 to 8.

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