JP6852746B2 - Optical sheets and optics - Google Patents

Description

The present invention relates to optical sheets and optical components.

For example, an optical sheet that absorbs a specific wavelength range from incident light is known for the purpose of increasing the contrast of the visual field, preventing glare, and the like (see, for example, Patent Document 1). This optical sheet is used by being attached to eyeglasses, sunglasses, sun visors, and the like.

The optical sheet described in Patent Document 1 contains, for example, a resin material and a dye (light absorber) contained in the resin material and absorbing light having a specific wavelength in the light in the visible light region. This optical sheet is formed into a sheet shape, for example, by blending a dye in a molten resin material, performing extrusion molding in that state, and then cooling.

However, depending on the resin material, the type of dye, and the like, the dye may agglomerate during molding, and the dye may partially agglomerate after molding. Further, in order to suppress the aggregation of the dye, for example, it is conceivable that the molecular weight of the resin material is relatively low to increase the fluidity in the molten state, and the resin material and the dye are sufficiently mixed. However, in this case, sufficient strength after molding may not be obtained.
As described above, it is difficult to achieve both prevention of dye aggregation and high strength.

WO2014 / 115705

An object of the present invention is to provide an optical sheet and an optical component having sufficient strength while preventing the light absorber from aggregating.

Such an object is achieved by the present invention of the following (1) to (6).
(1) Using bisphenol-type polycarbonate having a skeleton derived from bisphenol as the main material, it has a specific wavelength absorption layer containing a light absorber that absorbs light of a specific wavelength among light in the wavelength range of 350 nm or more and 740 nm or less. And
The light absorber has a maximum absorption wavelength in the wavelength range of 420 nm or more and 780 nm or less.
The content of the light absorber in the specific wavelength absorption layer is 0.001 wt% or more and 5 wt% or less.
The polycarbonate has a viscosity average molecular weight Mv of 23000 or more and 27500 or less, a water absorption of 0.04% or more and 0.15% or less, and a melt flow rate measured in accordance with JIS K7210 of 3 g. An optical sheet having a weight of / 10 min or more and 30 g / 10 min or less.

( 2 ) The optical sheet according to (1) above, which satisfies T1 <T2 when the melting point of the polycarbonate is T1 and the melting point of the light absorber is T2.

( 3 ) The optical sheet according to any one of (1) and (2) above, wherein the specific wavelength absorption layer has a stretchability of 10% or less.

( 4 ) The optical sheet according to any one of (1) to (3 ) above, wherein the specific wavelength absorption layer further contains an ultraviolet absorber that absorbs light in a wavelength range of 100 nm or more and 420 nm or less.

( 5 ) The optical sheet according to (4 ) above, wherein the content of the ultraviolet absorber in the specific wavelength absorbing layer is 0.05 wt% or more and 8 wt% or less.

( 6 ) With the base material
An optical component that is laminated on the base material and includes the optical sheet according to any one of (1) to (5) above.

According to the present invention, it is possible to provide an optical sheet having sufficient strength while preventing the light absorber from aggregating.

It is a perspective view of the sunglasses provided with the optical sheet (1st Embodiment) of this invention. It is a perspective view of the sun visor provided with the optical sheet (1st Embodiment) of this invention. It is a side view which shows typically the optical sheet manufacturing apparatus which manufactures the optical sheet shown in FIG. FIG. 5 is a cross-sectional view schematically showing an optical component manufacturing apparatus for manufacturing the optical sheet optical component shown in FIG. 1. It is sectional drawing of the optical component shown in FIG. It is sectional drawing of the optical component provided with the optical sheet (second embodiment) of this invention.

Hereinafter, the polarizing laminate of the present invention will be described in detail based on the preferred embodiments shown in the accompanying drawings.

<Embodiment>
FIG. 1 is a perspective view of sunglasses provided with the optical sheet (first embodiment) of the present invention. FIG. 2 is a perspective view of a sun visor including the optical sheet (first embodiment) of the present invention. FIG. 5 is a cross-sectional view of the optical component shown in FIG.

In FIGS. 1, 2, and 5 (the same applies to FIG. 6), the upper side is referred to as "upper" or "upper", and the lower side is also referred to as "lower" or "lower". Further, in the drawings referred to in the present specification, the dimensions in the thickness direction are exaggerated and shown, which are significantly different from the actual dimensions.

The optical sheet 1 of the present invention shown in FIGS. 1, 2 and 5 is specified by using polycarbonate as a main material and containing a light absorber that absorbs light of a specific wavelength among light in a wavelength range of 350 nm or more and 740 nm or less. The polycarbonate has a wavelength absorbing layer 11 and has a viscosity average molecular weight Mv of 20,000 or more and 30,000 or less.

As a result, the optical sheet 1 can absorb light in a specific wavelength range among visible light. Further, since the viscosity average molecular weight Mv of polycarbonate is 20,000 or more and 30,000 or less, for example, during extrusion molding, extrusion molding can be performed with the polycarbonate and the light absorber sufficiently mixed. Therefore, it is possible to prevent the light absorber from being excessively aggregated after molding. Further, since the viscosity average molecular weight Mv of polycarbonate is 20,000 or more and 30,000 or less, it has sufficient strength. From the above, the optical sheet 1 of the present invention prevents the light absorber from aggregating and has sufficient strength.

Such an optical sheet 1 is used for sunglasses (optical component 10) shown in FIG. 1 and a sun visor (optical component 10') shown in FIG.

As shown in FIG. 1, the sunglasses (optical component 10) include a frame 2 mounted on the user's head and a lens 3 (optical component) with an optical sheet fixed to the frame 2. In the present specification, the "lens" includes both a lens having a light-collecting function and a lens having no light-collecting function.

As shown in FIG. 1, the frame 2 is attached to the user's head, and includes a rim portion 21, a bridge portion 22, a temple portion 23 hung on the user's ear, and a nose pad portion 24. have. Each rim portion 21 has a ring shape, and is a portion on which the lens 3 with an optical sheet is mounted.

The bridge portion 22 is a portion that connects the rim portions 21. The temple portion 23 has a vine shape and is connected to the edge portion of each rim portion 21. The temple portion 23 is a portion that can be hung on the user's ear. The nose pad portion 24 is a portion that comes into contact with the user's nose when the sunglasses (optical component 10) are worn on the user's head. As a result, the mounted state can be stably maintained.

The shape of the frame 2 is not limited to the one shown in the figure as long as it can be attached to the user's head.

The optical component of the present invention has a lens 4 (base material) and an optical sheet 1 laminated on the front side (the side opposite to the human eye in the mounted state) of the lens 4. As a result, the function as sunglasses can be exhibited while enjoying the advantages of the optical sheet 1 described above.

As shown in FIG. 2, the sun visor (optical component 10') has a ring-shaped mounting portion 5 mounted on the user's head and a brim 6 provided in front of the mounting portion 5. There is. The brim 6 has a light transmitting member 7 (base material) and an optical sheet 1 provided on the upper surface of the light transmitting member 7. As a result, the function as a sun visor can be exhibited while enjoying the advantages of the optical sheet 1 described above.

The constituent materials of the lens 4 and the light transmissive member 7 are not particularly limited as long as they have light transmissivity, and various resin materials, various glasses, and the like can be mentioned, but they are of the same type as the polycarbonate of the optical sheet 1. Polycarbonate is preferred. As a result, the adhesion between the lens 4 or the light transmissive member 7 and the optical sheet 1 can be improved.

Hereinafter, the optical sheet 1 will be described in detail. In the following, a case where the lens 4 (base material) is laminated will be typically described.

As shown in FIG. 5, the optical sheet 1 has a specific wavelength absorption layer 11. The specific wavelength absorption layer 11 contains polycarbonate as a main material, a light absorber, and an ultraviolet absorber.

<Polycarbonate>
The polycarbonate is not particularly limited, and various types can be used, but among them, aromatic polycarbonate is preferable. The aromatic polycarbonate has an aromatic ring in its main chain, whereby the strength of the optical sheet 1 can be made more excellent.

This aromatic polycarbonate is synthesized, for example, by an interfacial polycondensation reaction between bisphenol and phosgene, a transesterification reaction between bisphenol and diphenyl carbonate, and the like.

Examples of bisphenol include bisphenol A and bisphenol (modified bisphenol) which is the origin of the repeating unit of polycarbonate represented by the following formula (1).

（式（１）中、Ｘは、炭素数１〜１８のアルキル基、芳香族基または環状脂肪族基であり、ＲａおよびＲｂは、それぞれ独立して、炭素数１〜１２のアルキル基であり、ｍおよびｎは、それぞれ０〜４の整数であり、ｐは、繰り返し単位の数である。）

(In the formula (1), X is an alkyl group having 1 to 18 carbon atoms, an aromatic group or a cyclic aliphatic group, and Ra and Rb are independently alkyl groups having 1 to 12 carbon atoms. , M and n are integers from 0 to 4, respectively, and p is the number of repeating units.)

Specific examples of the bisphenol that is the origin of the repeating unit of the polycarbonate represented by the above formula (1) include 4,4'-(pentane-2,2-diyl) diphenol and 4,4'-(. Pentan-3,3-diyl) diphenol, 4,4'-(butane-2,2-diyl) diphenol, 1,1'-(cyclohexylhexanediyl) diphenol, 2-cyclohexyl-1,4-bis (2-cyclohexyl-1,4-bis) 4-Hydroxyphenyl) benzene, 2,3-biscyclohexyl-1,4-bis (4-hydroxyphenyl) benzene, 1,1'-bis (4-hydroxy-3-methylphenyl) cyclohexane, 2,2'- Examples thereof include bis (4-hydroxy-3-methylphenyl) propane, and one or a combination of two or more of these can be used.

In particular, as the polycarbonate, it is preferable that the main component is bisphenol-type polycarbonate having a skeleton derived from bisphenol. By using such a bisphenol type polycarbonate, the optical sheet 1 exhibits further excellent strength.

The average molecular weight of such polycarbonate is such that the viscosity average molecular weight Mv is 20,000 or more and 30,000 or less. Thereby, the strength of the optical sheet 1 can be sufficiently increased. In addition, the fluidity can be sufficiently increased in the molten state of the polycarbonate. Thereby, for example, when the optical sheet 1 is manufactured by extrusion molding, the optical sheet 1 can be extruded in a state where the molten polycarbonate and the light absorber are sufficiently mixed. Therefore, it is possible to prevent the light absorber from being excessively aggregated after molding. Further, since the viscosity average molecular weight Mv of polycarbonate is 20,000 or more and 30,000 or less, it has sufficient strength. From the above, the optical sheet 1 of the present invention prevents the light absorber from aggregating and has sufficient strength.

If the viscosity average molecular weight Mv of the polycarbonate is too small, sufficient strength cannot be obtained after molding. On the other hand, if the viscosity average molecular weight Mv of the polycarbonate is too large, the fluidity cannot be sufficiently increased in the molten state. Therefore, the mixture of the molten polycarbonate and the light absorber becomes insufficient.

As for the average molecular weight of polycarbonate, the effect of the present invention can be obtained when the viscosity average molecular weight Mv is 20,000 or more and 30,000 or less, but when it is 23,000 or more and 28,000 or less, the effect is more remarkable and 24,000 or more and 27,500 or less. If so, the effect is particularly remarkable.

The melt flow rate (MFR) of polycarbonate measured in accordance with JIS K7210 is preferably 3 g / 10 min or more and 30 g / 10 min or less, and more preferably 15 g / 10 min or more and 25 g / 10 min or less. .. As a result, the fluidity of the polycarbonate can be sufficiently increased in the molten state. Therefore, for example, when the optical sheet 1 is manufactured by extrusion molding, extrusion molding can be performed in a state where the molten polycarbonate and the light absorber are sufficiently mixed.

Further, the polycarbonate has a water absorption rate of 0.02% or more and 0.2% or less, and more preferably 0.04% or more and 0.15% or less. Thereby, the extrusion molding can be performed in a state where the molten polycarbonate and the light absorber are sufficiently mixed. Therefore, it is possible to prevent the light absorber from aggregating excessively.

The water absorption rate in the present specification is a value measured by Aquatrack 3E (manufactured by Brabender).

The content of the polycarbonate in the specific wavelength absorption layer 11 is preferably 87 wt% or more and 99.949 wt% or less, and more preferably 90 wt% or more and 99.87 wt% or less. Thereby, the effect of the present invention can be more reliably exhibited.

<Light absorber>
A light absorber absorbs light of a specific wavelength. In the present specification, "absorbing light" means that the value of the maximum absorption wavelength in the visible light region of 420 nm to 780 nm is λ1, the value on the wavelength side 20 nm lower than λ1 is λ2, and the value on the wavelength side 20 nm higher than λ1. When it is set to λ3, it means that the absorbance λ1 / λ2 or the absorbance λ1 / λ3 is 1.0 or more.

The light absorber is not particularly limited as long as it absorbs light having a specific wavelength among the light in the wavelength range of 350 nm or more and 780 nm or less, and is, for example, a quinoline dye, an anthraquinone dye, a perylene dye, or the like. , And one or a combination of two or more of these can be used.

Examples of the quinoline dye include 2-methylquinoline, 3-methylquinoline, 4-methylquinoline, 6-methylquinoline, 7-methylquinoline, 8-methylquinoline, 6-isopropylquinoline, and 2,4-dimethylquinoline. Alkyl substituted quinoline compounds such as 2,6-dimethylquinoline and 4,6,8-trimethylquinoline, 2-aminoquinoline, 3-aminoquinoline, 5-aminoquinoline, 6-aminoquinoline, 8-aminoquinoline, 6-amino Amino group substituted quinoline compounds such as -2-methylquinoline, alkoxy group substituted quinoline compounds such as 6-methoxy-2-methylquinoline, 6,8-dimethoxy-4-methylquinoline, 6-chloroquinoline, 4,7-dichloro Examples thereof include halogen group substituted quinoline compounds such as quinoline, 3-bromoquinoline and 7-chloro-2-methylquinoline.

By blending such a quinoline-based dye, it is possible to absorb light having a wavelength range of 350 nm or more and 550 nm or less among the light incident on the specific wavelength absorption layer 11. It is preferable to have an absorption peak in a wavelength range of 400 nm or more and 550 nm or less.

Examples of the anthraquinone dye include (1) 2-anilino-1,3,4-trifluoroanthraquinone, (2) 2- (o-ethoxycarbonylanilino) -1,3,4-trifluoroanthraquinone, ( 3) 2- (p-ethoxycarbonylanilinone) -1,3,4-trifluoroanthraquinone, (4) 2- (m-ethoxycarbonylanilinone) -1,3,4-trifluoroanthraquinone, (5) 2- (o-cyanoanilinone) -1,3,4-trifluoroanthraquinone, (6) 2- (p-cyanoanilinone) -1,3,4-trifluoroanthraquinone, (7) 2- (m-cyanoanilinone)- 1,3,4-trifluoroanthraquinone, (8) 2- (o-nitroanilino) -1,3,4-trifluoroanthraquinone, (9) 2- (p-nitroanilino) -1,3,4-trifluoro Anthraquinone, (10) 2- (m-nitroanilinone) -1,3,4-trifluoroanthraquinone, (11) 2- (p-talshalbutylanilinone) -1,3,4-trifluoroanthraquinone, (12) ) 2- (o-methoxyanilino) -1,3,4-trifluoroanthraquinone, (13) 2- (2,6-diisopropylanilinone) -1,3,4-trifluoroanthraquinone, (14) 2 -(2,6-dichloroanilinone) -1,3,4-trifluoroanthraquinone, (15) 2- (2,6-difluoroanilinone) -1,3,4-trifluoroanthraquinone, (16) 2 -(3,4-dicyanoanilinone) -1,3,4-trifluoroanthraquinone, (17) 2- (2,4,6-trichloroanilinone) -1,3,4-trifluoroanthraquinone, (18) 2 -(2,3,5,6-tetrachloroanilinone) -1,3,4-trifluoroanthraquinone, (19) 2- (2,3,5,6-tetrafluoroanilinone) -1,3, 4-Trifluoroanthraquinone, (20) 3- (2,3,4,5-tetrafluoroanilinone) -2-butoxy-1,4-difluoroanthraquinone, (21) 3- (4-cyano-3-chloroanilinone) ) -2-octyloxy-1,4-difluoroanthraquinone, (22) 3- (3,4-dicyanoanilinone) -2-hexyloxy-1,4-difluoroanthraquinone, (23) 3- (4-cyano-3) -Chloroanilino) -1,2-dibutoxy-4-fluoroanthraquinone, (24) 3- (p-sia) Noanilino) -2-phenoxy-1,4-difluoroanthraquinone, (25) 3- (p-cyanoanilino) -2- (2,6-diethylphenoxy) -1,4-difluoroanthraquinone, (26) 3- (2) , 6-Dichloroanilinone) -2- (2,6-dichlorophenoxy) -1,4-difluoroanthraquinone, (27) 3- (2,3,5,6-tetrachloroanilino) -2- (2) , 6-Dimethoxyphenoxy) -1,4-difluoroanthraquinone, (28) 2,3-dianilino-1,4-difluoroanthraquinone, (29) 2,3-bis (p-talshalbutylanilinone) -1, 4-difluoroanthraquinone, (30) 2,3-bis (p-methoxyanilino) -1,4-difluoroanthraquinone, (31) 2,3-bis (2-methoxy-6-methylanilino) -1,4- Difluoroanthraquinone, (32) 2,3-bis (2,6-diisopropylanilinone) -1,4-difluoroanthraquinone, (33) 2,3-bis (2,4,6-trichloroanilinone) -1, 4-Difluoroanthraquinone, (34) 2,3-bis (2,3,5,6-tetrachloroanilinone) -1,4-difluoroanthraquinone, (35) 2,3-bis (2,3,5) 6-Tetrafluoroanilinone) -1,4-difluoroanthraquinone, (36) 2,3-bis (p-cyanoanilino) -1-methoxyethoxy-4-fluoroanthraquinone, (37) 2- (2,6-dichloro Anilino) -1,3,4-trichloroanthraquinone, (38) 2- (2,3,5,6-tetrafluoroanthraquinone) -1,3,4-trichloroanthraquinone, (39) 3- (2) 6-Dichloroanilino) -2- (2,6-dichlorophenoxy) -1,4-dichloroanthraquinone, (40) 2- (2,6-dichloroanilino) anthraquinone, (41) 2- (2,3) , 5,6-tetrafluoroanilinone) anthraquinone, (42) 3- (2,6-dichloroanilino) -2- (2,6-dichlorophenoxy) anthraquinone, (43) 2,3-bis (2-) Methoxy-6-methylanilinone) -1,4-dichloroanthraquinone, (44) 2,3-bis (2,6-diisopropylanilino) anthraquinone, (45) 2-butylamino-1,3,4-trifluoroanthraquinone , (46) 1,4-bis (n-butylamino) -2,3-difluoroanthraquinone , (47) 1,4-bis (n-octylamino) -2,3-difluoroanthraquinone, (48) 1,4-bis (hydroxyethylamino) -2,3-difluoroanthraquinone, (49) 1,4 -Bis (cyclohexylamino) -2,3-difluoroanthraquinone, (50) 1,4-bis (cyclohexylamino) -2-octyloxy-3-fluoroanthraquinone, (51) 1,2,4-tris (2) 4-Dimethoxyphenoxy-3-fluoroanthraquinone, (52) 2,3-bis (phenylthio) -1-phenoxy-4-fluoroanthraquinone, (53) 1,2,3,4-tetra (p-methoxyphenoxy)- Anthraquinone and the like can be mentioned.

By blending such an anthraquinone-based dye, it is possible to absorb light having a wavelength of 450 nm or more and 600 nm or less among the light incident on the specific wavelength absorption layer 11. It is preferable to have an absorption peak in a wavelength range of 500 nm or more and 600 nm or less.

Examples of the perylene dye include N, N'-dimethylperylene-3,4,9,10-tetracarboxylic dianimide and N, N'-diethylperylene-3,4,9,10-tetracarboxylic dianimide. , N, N'-bis (4-methoxyphenyl) -perylene-3,4,9,10-tetracarboxylic dianimide, N, N'-bis (4-ethoxyphenyl) -perylene-3,4,9, Examples thereof include 10-tetracarboxylic dianimide, N, N'-bis (4-chlorophenyl) -perylene-3,4,5,10-tetracarboxylic dianimide, and N, N'-bis are particularly preferable. Examples thereof include (3,5-dimethylphenyl) -perylene-3,4,9,10-diimidetetracarboxylic acid.

By blending such a perylene-based dye, it is possible to absorb light having a wavelength of 400 nm or more and 800 nm or less among the light incident on the specific wavelength absorption layer 11. It is preferable to have an absorption peak in a wavelength range of 600 nm or more and 780 nm or less.

By blending the above light absorber, it is possible to absorb light in a specific wavelength range. Therefore, for example, the user can clearly recognize the contour of an object or a person in the wearing state, and can enhance safety.

The content of the light absorber (total of each light absorber) in the specific wavelength absorbing layer 11 is preferably 0.001 wt% or more and 5 wt% or less, and more preferably 0.003 wt% or more and 4 wt% or less. preferable. As a result, the above effect can be more reliably exerted. If the content is too small, the effect as a light absorber may not be sufficiently obtained. On the other hand, if the content is too large, the light absorber tends to aggregate easily.

<UV absorber>
The ultraviolet absorber absorbs ultraviolet rays (light having a wavelength range of 100 nm or more and 420 nm or less).

The ultraviolet absorber is not particularly limited, and examples thereof include triazine compounds, benzophenone compounds, benzotriazole compounds, and cyanoacrylate compounds, and one or a combination of two or more of these can be used. Of these, triazine compounds are particularly preferably used. As a result, deterioration of the specific wavelength absorbing layer 11 (polycarbonate and light absorbing agent) due to ultraviolet rays can be prevented or suppressed, and the weather resistance of the optical sheet 1 can be enhanced.

Examples of triazine-based compounds include 2-mono (hydroxyphenyl) -1,3,5-triazine compound, 2,4-bis (hydroxyphenyl) -1,3,5-triazine compound, and 2,4,6-tris ( Hydroxylphenyl) -1,3,5-triazine compounds, specifically 2,4-diphenyl-6- (2-hydroxy-4-methoxyphenyl) -1,3,5-triazine, 2, 4-diphenyl-6- (2-hydroxy-4-ethoxyphenyl) -1,3,5-triazine, 2,4-diphenyl- (2-hydroxy-4-propoxyphenyl) -1,3,5-triazine, 2,4-Diphenyl- (2-hydroxy-4-butoxyphenyl) -1,3,5-triazine, 2,4-diphenyl-6- (2-hydroxy-4-butoxyphenyl) -1,3,5- Triazine, 2,4-diphenyl-6- (2-hydroxy-4-hexyloxyphenyl) -1,3,5-triazine, 2,4-diphenyl-6- (2-hydroxy-4-octyloxyphenyl)- 1,3,5-triazine, 2,4-diphenyl-6- (2-hydroxy-4-dodecyloxyphenyl) -1,3,5-triazine, 2,4-diphenyl-6- (2-hydroxy-4) −benzyloxyphenyl) -1,3,5-triazine, 2,4-diphenyl-6- (2-hydroxy-4-butoxyethoxy) -1,3,5-triazine, 2,4-bis (2-hydroxy) -4-Butoxyphenyl) -6- (2,4-dibutoxyphenyl) -1,3-5-triazine, 2,4,6-tris (2-hydroxy-4-methoxyphenyl) -1,3,5 -Triazine, 2,4,6-tris (2-hydroxy-4-ethoxyphenyl) -1,3,5-triazine, 2,4,6-tris (2-hydroxy-4-propoxyphenyl) -1,3 , 5-Triazine, 2,4,6-Tris (2-hydroxy-4-butoxyphenyl) -1,3,5-Triazine, 2,4,5-Tris (2-hydroxy-4-hexyloxyphenyl)- 1,3,5-triazine, 2,4,6-tris (2-hydroxy-4-octyloxyphenyl) -1,3,5-triazine, 2,4,6-tris (2-hydroxy-4-dodecyl) Oxyphenyl) -1,3,5-triazine, 2,4,6-tris (2-hydroxy-4-benzyloxyphenyl) -1,3,5-triazine, 2,4,6-tris ( 2-Hydroxy-4-ethoxyethoxyphenyl) -1,3,5-triazine, 2,4,6-tris (2-hydroxy-4-butoxyethoxyphenyl) -1,3,5-triazine, 2,4 6-Tris (2-Hydroxy-4-propoxyethoxyphenyl) -1,3,5-triazine, 2,4,6-Tris (2-Hydroxy-4-methoxycarbonylpropyloxyphenyl) -1,3,5- Triazine, 2,4,6-tris (2-hydroxy-4-ethoxycarbonylethyloxyphenyl) -1,3,5-triazine, 2,4,6-tris (2-hydroxy-4- (1- (2) −ethoxyhexyloxy) -1-oxopropan-2-yloxy) phenyl) -1,3,5-triazine, 2,4,6-tris (2-hydroxy-3-methyl-4-methoxyphenyl) -1, 3,5-Triazine, 2,4,6-Tris (2-Hydroxy-3-methyl-4-ethoxyphenyl) -1,3,5-Triazine, 2,4,6-Tris (2-Hydroxy-3-3) Methyl-4-propoxyphenyl) -1,3,5-triazine, 2,4,6-tris (2-hydroxy-3-methyl-4-butoxyphenyl) -1,3,5-triazine, 2,4 6-Tris (2-Hydroxy-3-methyl-4-hexyloxyphenyl) -1,3,5-triazine, 2,4,6-Tris (2-Hydroxy-3-methyl-4-octyloxyphenyl)- 1,3,5-triazine, 2,4,6-tris (2-hydroxy-3-methyl-4-dodecyloxyphenyl) -1,3,5-triazine, 2,4,6-tris (2-hydroxy) -3-Methyl-4-benzyloxyphenyl) -1,3,5-triazine, 2,4,6-tris (2-hydroxy-3-methyl-4-ethoxyethoxyphenyl) -1,3,5-triazine , 2,4,6-Tris (2-Hydroxy-3-methyl-4-butoxyethoxyphenyl) -1,3,5-triazine, 2,4,6-Tris (2-Hydroxy-3-methyl-4-4) Propoxyethoxyphenyl) -1,3,5-triazine, 2,4,6-tris (2-hydroxy-3-methyl-4-methoxycarbonylpropyloxyphenyl) -1,3,5-triazine, 2,4 6-Tris (2-Hydroxy-3-methyl-4-ethoxycarbonylethyloxyphenyl) -1,3,5-triazine, 2,4,6-Tris (2-hydroki) Examples thereof include 3-methyl-4- (1- (2-ethoxyhexyloxy) -1-oxopropan-2-yloxy) phenyl) -1,3,5-triazine. Examples of commercially available triazine-based ultraviolet absorbers include "Tinubin 1577", "Tinubin 460", "Tinubin 477" (manufactured by BASF Japan), and "ADEKA STUB LA-F70" (manufactured by ADEKA).

The specific wavelength absorption layer 11 further contains an ultraviolet absorber that absorbs light in the wavelength range of 100 nm or more and 420 nm or less as described above, so that the wavelength of the light incident on the specific wavelength absorption layer 11 is 100 nm or more and 420 nm or less. Can absorb the light of. As a result, deterioration of the specific wavelength absorbing layer 11 (polycarbonate and light absorbing agent) due to ultraviolet rays can be prevented or suppressed, and the weather resistance of the optical sheet 1 can be enhanced.

The content of the ultraviolet absorber in the specific wavelength absorbing layer 11 is preferably 0.05 wt% or more and 8 wt% or less, and more preferably 0.07 wt% or more and 6 wt% or less. As a result, the above effect can be more reliably exerted. If the content is too small, the effect as an ultraviolet absorber may not be sufficiently obtained. On the other hand, if the content is too large, the ultraviolet absorber tends to aggregate easily.

The thickness of the specific wavelength absorbing layer 11 is not particularly limited, but is preferably 0.05 mm or more and 1.5 mm or less, and more preferably 0.3 mm or more and 0.7 mm or less. As a result, the handleability can be improved, and it is possible to prevent the optical component as a whole from being unnecessarily thickened.

Further, the specific wavelength absorption layer 11 may be produced by stretching or may be produced without stretching, but the degree of stretching is preferably 10% or less. More preferably, it is 5% or less. This makes it possible to prevent or suppress color unevenness, light absorber unevenness, and ultraviolet absorber unevenness during stretching.

Further, when the melting point of the polycarbonate is T1 and the melting point of the light absorber is T2, it is preferable that T1 <T2 is satisfied. This makes it possible to prevent the light absorber from being altered or discolored by heat when the molten polycarbonate and the light absorber are mixed.

Further, when the melting point of the polycarbonate is T1 and the melting point of the ultraviolet absorber is T3, it is preferable that T1 <T3 is satisfied. This makes it possible to prevent the ultraviolet absorber from being altered or discolored by heat when the molten polycarbonate and the light absorber are mixed.

The melting point T1 of the polycarbonate is preferably 250 ° C. or higher and 400 ° C. or lower, and more preferably 270 ° C. or higher and 350 ° C. or lower.

The melting point T2 of the light absorber is preferably 300 ° C. or higher and 400 ° C. or lower, and more preferably 330 ° C. or higher and 360 ° C. or lower. The melting point T3 of the ultraviolet absorber is preferably 310 ° C. or higher and 370 ° C. or lower, and more preferably 340 ° C. or higher and 360 ° C. or lower. By setting the melting points T1 to T3 in the above numerical range, the above effect can be more reliably exhibited.

The specific wavelength absorption layer 11 may contain a dye different from the dyes listed above. The dye is not particularly limited, and examples thereof include pigments and dyes, and these can be used alone or in combination.

The pigment is not particularly limited. Azo pigments such as permanent carmine, permanent red, naphthol red, condensed azo red, benz imidazolone carmine, benz imidazolone brown, anthraquinone pigments such as anthrapyrimidine yellow and anthraquinonyl red, azomethine pigments such as copper azomethin yellow, Kinophthalone pigments such as quinophthalone yellow, isoindolin pigments such as isoindolin yellow, nitroso pigments such as nickeldioxime yellow, perinone pigments such as perinone orange, quinacridone magenta, quinacridon maroon, quinacridone scarlet, quinacridone red, etc. Kinacridone pigments, perylene pigments such as perylene red and perylene maroon, pyrrolopyrrole pigments such as diketopyrrolopyrrole red, organic pigments such as dioxazine pigments such as dioxazine violet, carbon black, lamp black, furnace black, Carbon pigments such as ivory black, graphite and fullerene, chromate pigments such as yellow lead and molybdate orange, cadmium yellow, cadmium lithopon yellow, cadmium orange, cadmium lithopon orange, silver vermilion, cadmium red, cadmium lithopon Sulfur pigments such as red and sulfide, ocher, titanium yellow, titanium barium nickel yellow, bengara, lead tan, amber, brown iron oxide, zinc iron chrome brown, chrome oxide, cobalt green, cobalt chrome green, titanium cobalt green, Oxide pigments such as cobalt blue, cerulean blue, cobalt aluminum chrome blue, iron black, manganese ferrite black, cobalt ferrite black, copper chrome black, copper chrome manganese black, hydroxide pigments such as viridian, and ferns such as navy blue. Examples thereof include Russian pigments, silicate pigments such as ultramarine, phosphate pigments such as cobalt violet and mineral violet, and inorganic pigments such as cadmium sulfide and cadmium selenium. One of them or two or more of them can be used in combination.

The dye is not particularly limited, and for example, a metal complex dye, a cyan dye, a xanthene dye, an azo dye, a hibiscus dye, a blackberry dye, a raspberry dye, a pomegranate juice dye, a chlorophyll dye, a tetraazoporphyrin compound and the like. Examples include porphyrin compounds, and one or a combination of two or more of these can be used.

Next, a method for manufacturing an optical sheet and a method for manufacturing an optical component will be described. In the following, a case where an optical sheet is manufactured by using an extrusion method will be described as an example.

(Manufacturing method of optical sheet)
First, the optical sheet manufacturing apparatus used in this manufacturing method will be described.

FIG. 3 is a side view schematically showing an optical sheet manufacturing apparatus for manufacturing the optical sheet shown in FIG. FIG. 4 is a cross-sectional view schematically showing an optical component manufacturing apparatus for manufacturing the optical sheet optical component shown in FIG. In the following description, the upper side in FIG. 4 is referred to as "upper" and the lower side is referred to as "lower".

The optical sheet manufacturing apparatus 100 shown in FIG. 3 has a sheet supply unit 200 and a sheet forming unit 300.

In the present embodiment, the sheet supply unit 200 includes an extruder 210 and a T-die 220 connected to the molten resin discharge unit of the extruder 210 via a pipe. The T-die 220 supplies the molten or softened strip-shaped sheet 1'to the sheet forming portion 300.

The T-die 220 is an extrusion-molded portion that extrudes a sheet 1'in a molten state or a softened state into a strip-shaped sheet by an extrusion method. The constituent materials constituting the above-mentioned optical sheet 1 are loaded in the T-die 220 in a molten state, and by extruding the molten material from the T-die 220, the strip-shaped sheet 1'is continuously sent out. Is done.

The sheet molding unit 300 has a touch roll 310, a cooling roll 320, and a subsequent cooling roll 330. Each of these rolls is configured to rotate independently by a motor (driving means) (not shown), and is cooled by the rotation of these rolls so that they are continuously delivered. By continuously feeding the sheet 1'to the sheet forming portion 300, the surface of the sheet 1'is flattened and the sheet 1'is set to a desired thickness and cooled. Then, the optical sheet 1 is obtained by cutting the cooled sheet 1'to a predetermined length.

The optical sheet of the present embodiment is manufactured by the method of manufacturing an optical sheet using the optical sheet manufacturing apparatus 100 as described above.

The production of an optical sheet includes an extrusion process, a molding process, and a cooling process.
First, the strip-shaped molten or softened sheet 1'is extruded (extrusion step). In this extrusion step, the extruder 210 is loaded with the constituent materials (polycarbonate, light absorber, ultraviolet absorber, etc.) of the optical sheet 1. Further, the constituent material of the optical sheet 1 is in a molten or softened state in the extruder 210. Here, as described above, in the present invention, since the polycarbonate has a viscosity average molecular weight Mv of 20,000 or more and 30,000 or less, the polycarbonate, the light absorber, and the ultraviolet absorber are sufficiently mixed. Then, by extruding these in a sufficiently mixed state, it is possible to prevent the light absorber, the ultraviolet absorber, and the like from being excessively aggregated in the optical sheet 1 obtained through the molding step and the cooling step described later. can do.

Next, the surface of the sheet 1'is flattened and the sheet 1'is set to a predetermined thickness (molding step). This step is performed between the touch roll 310 and the cooling roll 320.

Next, the surface of the sheet 1'is cooled (cooling step). This step is performed between the cooling roll 320 and the subsequent cooling roll 330.

The optical sheet 1 can be obtained through the above steps. Next, a method of manufacturing optical components will be described.

(Manufacturing method of optical parts)
First, the optical component manufacturing apparatus used in this manufacturing method will be described.

The optical component manufacturing apparatus 400 shown in FIG. 4 has a resin supply unit 500 and a mold 600. The resin supply unit 500 is filled with the above-mentioned polycarbonate. The mold 600 has a cavity 610 and a supply port 620 that communicates inside and outside the cavity 610. Further, the mold 600 is composed of an upper member 630 and a lower member 640, and in an assembled state in which these are assembled, the mold 600 that defines the optical component manufacturing apparatus 400 is configured.

The optical component manufacturing apparatus of the present embodiment is manufactured by the manufacturing method of the optical sheet manufacturing apparatus using the optical component manufacturing apparatus 400 as described above.

The method for manufacturing an optical component includes an optical sheet arranging process and a lens material supply process.
First, in a state where the upper member 630 and the lower member 640 are disassembled, the optical sheet 1 is arranged on the bottom surface 641 of the lower member 640 (optical sheet arrangement step). The bottom surface 641 has a curved concave surface, whereby a curved surface can be formed on the lens 4. Further, since the optical sheet 1 has flexibility, it is arranged so as to follow the shape of the bottom surface 641.

Next, the upper member 630 and the lower member 640 are put into an assembled state, and the molten or softened lens material is poured through the supply port 620 (lens material supply step). Then, by cooling the lens material in a molten or softened state, a laminated body in which the optical sheet 1 and the lens are laminated can be obtained.

In the above description, the so-called sheet insert method has been described as an example, but the present invention is not limited to this, and for example, even if the optical sheet 1 is laminated on a molded lens via an adhesive. Good.

<Second Embodiment>
FIG. 6 is a cross-sectional view of an optical component including the optical sheet (second embodiment) of the present invention.

Hereinafter, the second embodiment of the optical sheet and the optical component of the present invention will be described with reference to this figure, but the differences from the above-described embodiments will be mainly described, and the same matters will be omitted.
The present embodiment is the same as the first embodiment except that it has a polarizing film.

(Polarizing film)
As shown in FIG. 6, the optical sheet 1A further has a polarizing film 12 and an adhesive layer 13. The polarizing film 12 is laminated on the specific wavelength absorption layer 11 via the adhesive layer 13. In the illustrated configuration, the polarizing film 12 is arranged on the lens 4 side.

The polarizing film 12 has a function of extracting linearly polarized light having a plane of polarization in a predetermined direction from incident light (natural light that is not polarized). As a result, the incident light incident on the eyes through the optical sheet 1 is polarized.

The degree of polarization of the polarizing film 12 is not particularly limited, but is preferably 50% or more and 100% or less, and more preferably 80% or more and 100% or less. The visible light transmittance of the polarizing film 12 is not particularly limited, but is preferably 10% or more and 80% or less, and more preferably 20% or more and 50% or less.

The constituent material of such a polarizing film 12 is not particularly limited as long as it has the above functions, but for example, polyvinyl alcohol (PVA), partially formalized polyvinyl alcohol, polyethylene vinyl alcohol, polyvinyl butyral, polycarbonate, ethylene- A polymer film composed of a partially ken-valent product of a vinyl acetate copolymer, which is uniaxially stretched by adsorbing and dyeing a bicolor substance such as iodine or a bicolor dye, a dehydrated product of polyvinyl alcohol, or poly. Examples thereof include a polyene-based oriented film such as a dehydroxated product of vinyl chloride.

Among these, the polarizing film 12 is preferably a polymer film mainly made of polyvinyl alcohol (PVA), which is adsorbed and dyed with iodine or a dichroic dye and uniaxially stretched. Polyvinyl alcohol (PVA) is a material having excellent transparency, heat resistance, affinity with iodine or a dichroic dye as a dye, and orientation during stretching. Therefore, the polarizing film 12 using PVA as a main material has excellent heat resistance and also has an excellent polarizing function.

Examples of the dichroic dyes include chloratin fast red, congo red, brilliant blue 6B, benzopurine, chlorazole black BH, direct blue 2B, diamine green, chrysophenone, sirius yellow, direct first red, and acid black. And so on.

The thickness of the polarizing film 12 is not particularly limited, and is preferably 5 μm or more and 60 μm or less, and more preferably 10 μm or more and 40 μm or less.

The adhesive (or adhesive) constituting the adhesive layer 13 is not particularly limited, and examples thereof include acrylic adhesives, urethane adhesives, epoxy adhesives, and silicone adhesives.

Of these, urethane-based adhesives are preferable. As a result, the transparency, adhesive strength, and durability of the adhesive layer 13 can be made more excellent, and the ability to follow the shape change can be made particularly excellent.

Even with such an embodiment, the same effect as that of the first embodiment can be obtained, and the polarization function is further provided.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to those described above, and modifications, improvements, etc. within the range in which the object of the present invention can be achieved are included in the present invention. Is.

For example, each part constituting the optical sheet of the present invention can be replaced with an arbitrary configuration capable of exhibiting the same function.

Further, the optical sheet of the present invention may have an arbitrary component added in addition to the above-described structure.

More specifically, for example, the optical sheet of the present invention may include a protective layer for protecting the surface, an intermediate layer, a power adjusting layer for adjusting the power as a lens, and the like.

Hereinafter, the present invention will be described in more detail based on Examples.
1. 1. Examination of optical sheet 1-1. Creation of Optical Sheet [Example 1]
[1] First, 100 parts by mass of bisphenol A type polycarbonate (manufactured by Mitsubishi Gas Chemical Company, "Iupilon E2000F E5111") and 0.04 parts by mass of light absorber (manufactured by Yamada Chemical Co., Ltd., "FDG-005"). , 0.4 parts by mass of an ultraviolet absorber (manufactured by Adeca, “Adecastab LA-31G”) was stirred and mixed to prepare an optical sheet forming material.

[2] Next, the optical sheet forming material was stored in the extruder 210 of the optical sheet manufacturing apparatus 100 shown in FIG. 3, melted, and extruded from the T-die 220 to obtain a sheet material. Then, the sheet material was cooled and molded by the sheet forming portion 300, and cut into a rectangular shape having an average thickness of 0.3 mm and a plan view of 500 mm × 500 mm to prepare an optical sheet.

The viscosity average molecular weight Mv of polycarbonate is 27,000, the melting point is T1, the temperature is 250 ° C., the melt flow rate measured according to JIS K7210 is 5.3 g / 10 min, and Aquatrack 3E (bu). The water absorption rate measured by Lavender) was 0.05%. The melting point T2 of the light absorber was 440 ° C. The melting point T3 of the ultraviolet absorber was 200 ° C.

[Example 2]
An optical layer of Example 2 was obtained in the same manner as in Example 1 except that the configuration of the optical sheet was changed as shown in Table 1.

[Example 3]
An optical layer of Example 3 was obtained in the same manner as in Example 1 except that the configuration of the optical sheet was changed as shown in Table 1.

[Example 4]
An optical layer of Example 4 was obtained in the same manner as in Example 1 except that the configuration of the optical sheet was changed as shown in Table 1.

[Example 5]
An optical layer of Example 5 was obtained in the same manner as in Example 1 except that the configuration of the optical sheet was changed as shown in Table 1.

[Example 6]
An optical layer of Example 6 was obtained in the same manner as in Example 1 except that the configuration of the optical sheet was changed as shown in Table 1.

[Example 7]
An optical layer of Example 7 was obtained in the same manner as in Example 1 except that the configuration of the optical sheet was changed as shown in Table 1.

[Comparative Example 1]
An optical layer of Comparative Example 1 was obtained in the same manner as in Example 1 except that the configuration of the optical sheet was changed as shown in Table 1.

[Comparative Example 2]
An optical layer of Comparative Example 2 was obtained in the same manner as in Example 1 except that the configuration of the optical sheet was changed as shown in Table 1.

In Table 1, a1 indicates polycarbonate (manufactured by Mitsubishi Gas Chemical Company, "E2000FN E5100"), a2 indicates polycarbonate (manufactured by Mitsubishi Gas Chemical Company, "H3000"), and a3 indicates polycarbonate (Sumika). Polycarbonate "200-3NAT"), a4 indicates polycarbonate (Mitsubishi Gas Chemical Company, "S2000"), and a5 indicates polycarbonate (EG "1300-03").

Further, in Table 1, b1 indicates a light absorber (manufactured by Yamada Chemical Co., Ltd., "FDG-005"), and in Table 1, b2 indicates a light absorber (manufactured by Yamada Chemical Co., Ltd., "FDG-002"). ), And in Table 1, b3 indicates a light absorber (manufactured by Yamada Chemical Co., Ltd., “FDB-001”).

Further, in Table 1, c indicates an ultraviolet absorber (manufactured by ADEKA CORPORATION, “ADEKA STUB LA-31G”).

1-2. Evaluation The optical sheets of each example and each comparative example were evaluated by the following methods.

(Cohesiveness evaluation)
Observation was performed using a digital microscope (“VHX-1000” manufactured by KEYENCE CORPORATION), the size of the agglomerates was measured, and the evaluation was performed as follows.

A: The size of the agglomerates is less than ^{0.05 mm 2.}
B: The size of the agglomerates is 0.05 mm ² or more and less ^{than 0.1 mm 2.}
C: The size of the agglomerates is 0.1 mm ² or more and less ^{than 0.5 mm 2.}
D: The size of the agglomerate is 0.5 mm ² or more.

(Strength evaluation)
The Charpy impact strength was measured according to ISO 179-1 and ISO 179-2 and evaluated as follows.

A: 80KJ / m ² or more.
B: 50 KJ / m ² or more and less than 80 KJ / m ^2.
C: 25KJ / m ² or more and less than 50KJ / m ^2.
D: Less than ^{25KJ / m 2.}

(Weather resistance evaluation)
Irradiation with a xenon lamp (7.5 kW, output: 1.728 MJ / m ² ) (light source filter: daylight filter, irradiance: wide band (300 to 400 nm), 60 ± 2 W / m ² ) for 8 hours causes yellowing. The degree (ΔYI) was evaluated as follows.

A: ΔYI is less than 1.0 and there is no change in appearance.
B: When ΔYI is 1.0 or more and less than 2.0, a slight change in appearance is observed.
C: Appearance changes are observed when ΔYI is 2.0 or more and less than 3.0.
D: When ΔYI is 3.0 or more, a remarkable change in appearance is observed.

The evaluation results of the optical sheets of each of the examples and the comparative examples obtained as described above are shown in Table 1 below.

As shown in Table 1, the optical sheets in each of the examples exhibited the same or higher strength than each of the comparative examples, and the formation of aggregates was suppressed in each of the comparative examples.

1 Optical sheet 1'Sheet 1A Optical sheet 2 Frame 3 Lens with optical sheet 4 Lens 5 Mounting part 6 Brim 7 Light transmissive member 10 Optical part 10' Optical part 11 Specific wavelength absorption layer 12 Polarizing film 13 Adhesive layer 21 Rim part 22 Bridge part 23 Temple part 24 Nose pad part 100 Optical sheet manufacturing equipment 200 Sheet supply part 210 Extruder 211 Molten resin discharge part 212 Piping 220 T-die 300 Sheet molding part 310 Touch roll 320 Cooling roll 330 Later stage cooling roll 400 Optical parts manufacturing Device 500 Resin supply unit 600 Mold 610 Cavity 620 Supply port 630 Upper member 640 Lower member 641 Bottom surface

Claims (6)

It has a specific wavelength absorption layer containing a light absorber that absorbs light of a specific wavelength among light in the wavelength range of 350 nm or more and 740 nm or less, using bisphenol type polycarbonate having a skeleton derived from bisphenol as a main material.
The light absorber has a maximum absorption wavelength in the wavelength range of 420 nm or more and 780 nm or less.
The content of the light absorber in the specific wavelength absorption layer is 0.001 wt% or more and 5 wt% or less.
The polycarbonate has a viscosity average molecular weight Mv of 23000 or more and 27500 or less, a water absorption of 0.04% or more and 0.15% or less, and a melt flow rate measured in accordance with JIS K7210 of 3 g. An optical sheet having a weight of / 10 min or more and 30 g / 10 min or less. The optical sheet according to claim 1, wherein T1 <T2 is satisfied when the melting point of the polycarbonate is T1 and the melting point of the light absorber is T2. The optical sheet according to claim 1 or 2, wherein the specific wavelength absorption layer has a stretchability of 10% or less. The optical sheet according to any one of claims 1 to 3, wherein the specific wavelength absorbing layer further contains an ultraviolet absorber that absorbs light in a wavelength range of 100 nm or more and 420 nm or less. The optical sheet according to claim 4, wherein the content of the ultraviolet absorber in the specific wavelength absorbing layer is 0.05 wt% or more and 8 wt% or less. With the base material
An optical component that is laminated on the base material and includes the optical sheet according to any one of claims 1 to 5.

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