JP7306792B2 - optical components - Google Patents

Description

The present invention relates to optical components.

Cyclic olefin-based resin compositions are excellent in optical performance, and are therefore used as optical components such as optical lenses.
Techniques related to cyclic olefin-based resin compositions used in optical components include, for example, those described in Patent Document 1 (Japanese Unexamined Patent Application Publication No. 2015-199939).

Patent Document 1 discloses a cyclic olefin resin composition containing a cyclic olefin polymer and a diglycerin fatty acid ester. Patent Document 1 describes that the use of such a cyclic olefin-based resin composition provides a molded article having excellent optical performance and suppressing deterioration of optical performance under high-temperature and high-humidity conditions.

JP 2015-199939 A

Here, in recent years, electronic and electric devices are becoming lighter, smaller, and thinner. Therefore, for example, optical parts such as optical lenses (also called camera lenses) used in cameras are thin and small in diameter, and in terms of image quality, F-number characteristics (aperture value; F-number) and Good MTF (Modulation Transfer Function) characteristics (contrast reproduction ratio) are required. Therefore, not only are optical components required to be thin, but also their shapes are complicated. For this reason, the thickness of the optical component is not uniform, and the uneven thickness in which thin portions and thick portions coexist is progressing.
Here, according to the studies of the present inventors, in optical components containing a cyclic olefin polymer, those having a large ratio of maximum thickness to minimum thickness (also referred to as uneven thickness ratio) have weld lines (resin In molding, it has become clear that there are cases where the flow of the molten resin joins in the mold and the thin line generated at the fused portion becomes large. More specifically, when the maximum thickness of the optical component is T _max and the minimum thickness of the optical component is T _min , the thickness variation ratio indicated by T _max /T _min is 2.0 or more. It was found that the generated weld line tends to become large. If a weld line occurs and an optical defect occurs, it is not preferable because it causes degradation of image quality such as flare phenomenon and ghost phenomenon.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides an optical component that is excellent in optical performance and suppresses the occurrence of weld lines.

The present inventors have diligently studied to solve the above problems. As a result, by using a cyclic olefin-based resin composition (hereinafter also referred to as a resin composition) having a melt tension at 260°C within a specific range, an optical component with excellent optical performance and suppressed occurrence of weld lines was found. can be realized, and the present invention has been completed.

The present invention is as described below.

（上記一般式（Ｉ）において、Ｒ^３００は水素原子又は炭素原子数１～２９の直鎖状または分岐状の炭化水素基を示す。）

（上記一般式（ＩＩ）において、ｕは０または１であり、ｖは０または正の整数であり、ｗは０または１であり、Ｒ^６１～Ｒ^７８ならびにＲ^ａ１およびＲ^ｂ１は、互いに同一でも異なっていてもよく、水素原子、ハロゲン原子、炭素原子数１～２０のアルキル基、炭素原子数１～２０のハロゲン化アルキル基、炭素原子数３～１５のシクロアルキル基または炭素原子数６～２０の芳香族炭化水素基であり、Ｒ^７５～Ｒ^７８は、互いに結合して単環または多環を形成していてもよい。）

（上記一般式（ＩＩＩ）において、ｘおよびｄは０または１以上の整数であり、ｙおよびｚは０、１または２であり、Ｒ^８１～Ｒ^９９は、互いに同一でも異なっていてもよく、水素原子、ハロゲン原子、炭素原子数１～２０のアルキル基若しくは炭素原子数３～１５のシクロアルキル基である脂肪族炭化水素基、炭素原子数６～２０の芳香族炭化水素基またはアルコキシ基であり、Ｒ^８９およびＲ^９０が結合している炭素原子と、Ｒ^９３が結合している炭素原子またはＲ^９１が結合している炭素原子とは、直接あるいは炭素原子数１～３のアルキレン基を介して結合していてもよく、またｙ＝ｚ＝０のとき、Ｒ^９５とＲ^９２またはＲ^９５とＲ^９９とは互いに結合して単環または多環の芳香族環を形成していてもよい。）

（上記一般式（ＩＶ）において、Ｒ^１００、Ｒ^１０１は、互いに同一でも異なっていてもよく、水素原子または炭素原子数１～５の炭化水素基を示し、ｆは１≦ｆ≦１８である。）
［７］
上記［６］に記載の光学部品において、
上記共重合体（Ａ１）中の上記環状オレフィン由来の繰り返し単位（ｂ）が、ビシクロ［２．２．１］－２－ヘプテンおよびテトラシクロ［４．４．０．１^２，５．１^７，１０］－３－ドデセンから選ばれる少なくとも一種の化合物に由来する繰り返し単位を含む光学部品。
［８］
上記［６］または［７］に記載の光学部品において、
上記共重合体（Ａ１）中の上記オレフィン由来の繰り返し単位（ａ）が、エチレンに由来する繰り返し単位を含む光学部品。
［９］
上記［１］乃至［８］のいずれか一つに記載の光学部品において、
上記樹脂組成物が脂肪酸とエーテル基を１つ以上有する多価アルコールとの脂肪酸エステルをさらに含む光学部品。
［１０］
上記［９］に記載の光学部品において、
上記光学部品を構成する上記樹脂組成物に含まれる上記環状オレフィン系重合体（Ａ）を１００質量部としたとき、上記樹脂組成物中の上記脂肪酸エステルの含有量が０．０５質量部以上１．２質量部以下である光学部品。
［１１］
上記［９］または［１０］に記載の光学部品において、
上記脂肪酸エステルがグリセリン脂肪酸エステルを含む光学部品。 [1]
An optical component made of a resin composition containing a cyclic olefin polymer (A),
When the maximum thickness of the optical component is T _max and the minimum thickness of the optical component is T _min ,
The uneven thickness ratio indicated by T _max /T _min is 2.0 or more,
Measured in accordance with ASTM D3835, using a capillary die with length L = 8.00 mm, inner diameter D = 2.095 mm, and L/D = 3.82 at 260°C, extrusion speed 15 mm/min, and take-up speed 15 m/min. An optical component, wherein the melt tension of the resin composition containing the cyclic olefin polymer (A) is 4.5 mN or more and 15.0 mN or less.
[2]
In the optical component described in [1] above,
An optical component, wherein the glass transition temperature of the resin composition containing the cyclic olefin polymer (A) is in the range of 130°C or higher and 160°C or lower.
[3]
In the optical component according to [1] or [2] above,
An optical component that is an f-theta lens, an imaging lens, a sensor lens, a prism, or a light guide plate.
[4]
In the optical component according to any one of [1] to [3] above,
An optical component that is an in-vehicle camera lens or a camera lens for mobile devices.
[5]
In the optical component according to any one of [1] to [4] above,
An optical component in which the cyclic olefin polymer (A) contains at least one selected from copolymers (A1) of ethylene or α-olefins and cyclic olefins and ring-opening polymers of cyclic olefins (A2).
[6]
In the optical component described in [5] above,
The cyclic olefin polymer (A) contains the copolymer (A1),
The copolymer (A1) is
at least one olefin-derived repeating unit (a) represented by the following general formula (I);
At least one cyclic olefin selected from the group consisting of repeating units represented by the following general formula (II), repeating units represented by the following general formula (III), and repeating units represented by the following general formula (IV) a repeating unit (b) derived from
Optical components with

(In general formula (I) above, R ³⁰⁰ represents a hydrogen atom or a linear or branched hydrocarbon group having 1 to 29 carbon atoms.)

(In general formula (II) above, u is 0 or 1, v is 0 or a positive integer, w is 0 or 1, and R ⁶¹ to R ⁷⁸ and R ^a1 and R ^b1 are the same hydrogen atom, halogen atom, alkyl group having 1 to 20 carbon atoms, halogenated alkyl group having 1 to 20 carbon atoms, cycloalkyl group having 3 to 15 carbon atoms or 6 carbon atoms to 20 aromatic hydrocarbon groups, and R ⁷⁵ to R ⁷⁸ may be bonded together to form a monocyclic or polycyclic ring.)

(In the above general formula (III), x and d are 0 or an integer of 1 or more, y and z are 0, 1 or 2, R ⁸¹ to R ⁹⁹ may be the same or different, a hydrogen atom, a halogen atom, an alkyl group having 1 to 20 carbon atoms, an aliphatic hydrocarbon group having 3 to 15 carbon atoms or a cycloalkyl group having 3 to 15 carbon atoms, an aromatic hydrocarbon group having 6 to 20 carbon atoms, or an alkoxy group; and the carbon atom to which R ⁸⁹ and R ⁹⁰ are bonded and the carbon atom to which R ⁹³ is bonded or the carbon atom to which R ⁹¹ is bonded are directly or an alkylene group having 1 to 3 carbon atoms When y=z=0, R ⁹⁵ and R ⁹² or R ⁹⁵ and R ⁹⁹ may be bonded to each other to form a monocyclic or polycyclic aromatic ring. good.)

(In general formula (IV) above, R ¹⁰⁰ and R ¹⁰¹ may be the same or different and represent a hydrogen atom or a hydrocarbon group having 1 to 5 carbon atoms, and f is 1 ≤ f ≤ 18. .)
[7]
In the optical component described in [6] above,
The repeating unit (b) derived from the cyclic olefin in the copolymer (A1) is bicyclo[2.2.1]-2-heptene and tetracyclo[4.4.0.1 ^2,5 . 1 ^7,10 ]-3-dodecene, comprising repeating units derived from at least one compound selected from the group consisting of:
[8]
In the optical component according to [6] or [7] above,
An optical component in which the olefin-derived repeating unit (a) in the copolymer (A1) contains an ethylene-derived repeating unit.
[9]
In the optical component according to any one of [1] to [8] above,
An optical component wherein the resin composition further comprises a fatty acid ester of a fatty acid and a polyhydric alcohol having one or more ether groups.
[10]
In the optical component according to [9] above,
When the cyclic olefin polymer (A) contained in the resin composition constituting the optical component is 100 parts by mass, the content of the fatty acid ester in the resin composition is 0.05 parts by mass or more. .2 parts by mass or less optical components.
[11]
In the optical component according to [9] or [10] above,
An optical component in which the fatty acid ester comprises a glycerin fatty acid ester.

According to the present invention, it is possible to provide an optical component that is excellent in optical performance and suppresses the occurrence of weld lines.

It is a sectional view showing typically an example of structure of an optical component of an embodiment concerning the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in all the drawings, the same constituent elements are denoted by the same reference numerals, and the explanation thereof is omitted as appropriate. Also, the drawings are schematic diagrams and do not correspond to actual dimensional ratios. In addition, "A to B" indicating a numerical range represents A or more and B or less unless otherwise specified.

[Optical parts]
First, optical components according to embodiments of the present invention will be described. FIG. 1 is a cross-sectional view schematically showing an example of the structure of an optical component according to an embodiment of the invention.
The optical component according to this embodiment is composed of a resin composition containing the cyclic olefin polymer (A). When the maximum thickness of the optical component is _Tmax and the minimum thickness of the optical component is _Tmin , the uneven thickness ratio indicated by _Tmax / _Tmin is 2.0 or more. In addition, conforming to ASTM D3835, using a capillary die with length L = 8.00 mm, inner diameter D = 2.095 mm, L / D = 3.82, 260 ° C., extrusion speed 15 mm / min, take-up speed 15 m / min The melt tension of the resin composition containing the cyclic olefin polymer (A) measured by is 4.5 mN or more and 15.0 mN or less.
In the present embodiment, the resin composition is also referred to as the resin composition when the resin composition consists only of the cyclic olefin polymer (A).

Here, according to the studies of the present inventors, in the optical component containing the cyclic olefin polymer (A), the ratio of the maximum thickness T _max to the minimum thickness T _min (T _max /T _min ) is large, It became clear that the generated weld line may become large. More specifically, the inventors have found that an optical component having a T _max /T _min of 2.0 or more tends to have large weld lines.
The present inventors have diligently studied to solve the above problems. As a result, T _max /T _min was 2.0 or more by using a resin composition containing a cyclic olefin polymer (A) having a melt tension of 4.5 mN or more and 15.0 mN or less at 260°C. However, the inventors have found that it is possible to realize an optical component that is excellent in optical performance and suppresses the occurrence of weld lines.

That is, according to the present embodiment, it is possible to realize an optical component that has excellent optical performance and suppresses the occurrence of weld lines.
Although the reason for this is not clear, a resin composition containing a cyclic olefin polymer (A) having a high melt viscosity, that is, a resin composition containing a cyclic olefin polymer (A) having a low melt tension, exhibits a melt flow state during molding. This is probably because the resin pressure in the mold is high, so that the molten resins can be fused well in the mold. As a result, in resin molding, it is thought that thin lines generated at the fused portion where the flow of molten resin merges within the mold are likely to disappear, and the generation of weld lines is suppressed.

The lower limit of the melt tension at 260°C of the resin composition containing the cyclic olefin polymer (A) is 4.5 mN or more, but from the viewpoint of further suppressing the occurrence of weld lines, it is preferably 5.0 mN or more. more preferably 6.0 mN or more, and still more preferably 7.0 mN or more.
In addition, the upper limit of the melt tension of the resin composition containing the cyclic olefin polymer (A) is 15.0 mN or less. From the viewpoint of stiffness and the like, it is preferably 12.0 mN or less, more preferably 10.0 mN or less.
The melt tension at 260° C. of the resin composition containing the cyclic olefin polymer (A) can be adjusted, for example, by adjusting the ratio of the feed amount of hydrogen to the feed amount of ethylene during the polymerization reaction described later. can.

The lower limit of the content of the cyclic olefin polymer (A) in the resin composition constituting the optical component according to the present embodiment is preferably 70% by mass or more when the total resin composition is 100% by mass. More preferably 80% by mass or more, still more preferably 90% by mass or more, and particularly preferably 95% by mass or more. When the content of the cyclic olefin polymer (A) in the resin composition constituting the optical component according to the present embodiment is at least the above lower limit, the optical performance can be further improved.
The upper limit of the content of the cyclic olefin polymer (A) in the resin composition constituting the optical component according to this embodiment is not particularly limited, but is, for example, 100% by mass or less.

Since the optical component according to this embodiment contains the cyclic olefin polymer (A), it has excellent optical performance. Therefore, it can be suitably used as an optical component in an optical system that needs to identify an image with high accuracy. An optical component is a component used in an optical device or the like, and specifically includes a sensor lens, a pickup lens, a projector lens, a prism, an fθ lens, an imaging lens, a light guide plate, and the like. From the viewpoint of effects, it can be suitably used for an fθ lens, an imaging lens, a sensor lens, a prism, or a light guide plate.
In particular, an optical component composed of a resin composition containing a cyclic olefin polymer (A) having a glass transition temperature in the range of 130° C. or higher and 160° C. or lower has high heat resistance and satisfies moist heat resistance. Furthermore, it has the surprising effect of suppressing the occurrence of weld lines.
Therefore, the optical component according to the present embodiment can be particularly suitably used for optical components that require heat resistance, such as vehicle-mounted camera lenses and camera lenses for mobile devices (mobile phones, smartphones, tablets, etc.). Vehicle-mounted camera lenses and mobile device camera lenses include, for example, view camera lenses, sensing camera lenses, light converging lenses for head-up displays, and light diffusion lenses for head-up displays.

In addition, the optical component according to the present embodiment has a thickness deviation ratio represented by T _max /T _min of 2.0 or more, preferably 2.3 or more, more preferably 2.5 or more, and still more preferably 2.7 or more. is. As a result, an optical component having a complicated shape and further superior optical performance can be obtained.
Here, the optical component having a complicated shape with a thickness deviation ratio equal to or higher than the above lower limit is not particularly limited, but examples thereof include shapes shown in (a) to (d) of FIG. Also, the distance connecting the opposing surfaces of the optical components is taken, and the longest distance is defined as T _max and the shortest distance is defined as T _min .
Lenses include not only concave lenses and convex lenses, but also various shapes such as aspherical lenses and one-sided concave and one-sided convex lenses.

Each component will be specifically described below.

(Cyclic olefin polymer (A))
The cyclic olefin-based polymer (A) according to this embodiment is a polymer having repeating units derived from a cyclic olefin as essential structural units.
Examples of the cyclic olefin polymer (A) include at least one selected from copolymers (A1) of ethylene or α-olefins and cyclic olefins and ring-opening polymers of cyclic olefins (A2).

The cyclic olefin compound constituting the copolymer (A1) according to the present embodiment is not particularly limited. .

The copolymer (A1) according to the present embodiment is capable of further improving heat resistance while maintaining a good balance of transparency and refractive index performance of the resulting optical component, and improving moldability. At least one olefin-derived repeating unit (a) represented by the general formula (I), a repeating unit represented by the following general formula (II), a repeating unit represented by the following general formula (III), and the following and at least one cyclic olefin-derived repeating unit (b) selected from the group consisting of repeating units represented by formula (IV).

上記一般式（Ｉ）において、Ｒ^３００は水素原子または炭素原子数１～２９の直鎖状または分岐状の炭化水素基を示す。

In general formula (I) above, R ³⁰⁰ represents a hydrogen atom or a linear or branched hydrocarbon group having 1 to 29 carbon atoms.

上記一般式（ＩＩ）において、ｕは０または１であり、ｖは０または正の整数、好ましくは０以上２以下の整数、より好ましくは０または１であり、ｗは０または１であり、Ｒ^６１～Ｒ^７８ならびにＲ^ａ１およびＲ^ｂ１は、互いに同一でも異なっていてもよく、水素原子、ハロゲン原子、炭素原子数１～２０のアルキル基、炭素原子数１～２０のハロゲン化アルキル基、炭素原子数３～１５のシクロアルキル基または炭素原子数６～２０の芳香族炭化水素基であり、Ｒ^７５～Ｒ^７８は互いに結合して単環または多環を形成していてもよい。

In the above general formula (II), u is 0 or 1, v is 0 or a positive integer, preferably an integer of 0 or more and 2 or less, more preferably 0 or 1, w is 0 or 1, R ⁶¹ to R ⁷⁸ , R ^a1 and R ^b1 may be the same or different, and may be a hydrogen atom, a halogen atom, an alkyl group having 1 to 20 carbon atoms, a halogenated alkyl group having 1 to 20 carbon atoms, It is a cycloalkyl group having 3 to 15 carbon atoms or an aromatic hydrocarbon group having 6 to 20 carbon atoms, and R ⁷⁵ to R ⁷⁸ may combine with each other to form a monocyclic or polycyclic ring.

上記一般式（ＩＩＩ）において、ｘおよびｄは０または１以上の整数、好ましくは０以上２以下の整数、より好ましくは０または１であり、ｙおよびｚは０、１または２であり、Ｒ^８１～Ｒ^９９は、互いに同一でも異なっていてもよく、水素原子、ハロゲン原子、炭素原子数１～２０のアルキル基若しくは炭素原子数３～１５のシクロアルキル基である脂肪族炭化水素基、炭素原子数６～２０の芳香族炭化水素基またはアルコキシ基であり、Ｒ^８９およびＲ^９０が結合している炭素原子と、Ｒ^９３が結合している炭素原子またはＲ^９１が結合している炭素原子とは、直接あるいは炭素原子数１～３のアルキレン基を介して結合していてもよく、またｙ＝ｚ＝０のとき、Ｒ^９５とＲ^９２またはＲ^９５とＲ^９９とは互いに結合して単環または多環の芳香族環を形成していてもよい。

In the general formula (III), x and d are 0 or an integer of 1 or more, preferably an integer of 0 or more and 2 or less, more preferably 0 or 1, y and z are 0, 1 or 2, and R ⁸¹ to R ⁹⁹ may be the same or different, and may be a hydrogen atom, a halogen atom, an aliphatic hydrocarbon group which is an alkyl group having 1 to 20 carbon atoms or a cycloalkyl group having 3 to 15 carbon atoms, carbon an aromatic hydrocarbon group or an alkoxy group having 6 to 20 atoms, the carbon atom to which R ⁸⁹ and R ⁹⁰ are bonded and the carbon atom to which R ⁹³ is bonded or the carbon atom to which R ⁹¹ is bonded may be bonded directly or through an alkylene group having 1 to 3 carbon atoms, and when y = z = 0, R ⁹⁵ and R ⁹² or R ⁹⁵ and R ⁹⁹ are bonded to each other It may form a monocyclic or polycyclic aromatic ring.

上記一般式（ＩＶ）において、Ｒ^１００、Ｒ^１０１は、互いに同一でも異なっていてもよく、水素原子または炭素原子数１～５の炭化水素基を示し、ｆは１≦ｆ≦１８である。

In general formula (IV) above, R ¹⁰⁰ and R ¹⁰¹ may be the same or different and represent a hydrogen atom or a hydrocarbon group having 1 to 5 carbon atoms, and f is 1≦f≦18.

The olefin monomer, which is one of the raw materials for copolymerization of the copolymer (A1) according to the present embodiment, undergoes addition copolymerization to form the structural unit represented by the general formula (I). Specifically, an olefin monomer represented by the following general formula (Ia) corresponding to the above general formula (I) is used.

上記一般式（Ｉａ）において、Ｒ^３００は水素原子または炭素原子数１～２９の直鎖状または分岐状の炭化水素基を示す。上記一般式（Ｉａ）で表されるオレフィンモノマーとしては、例えば、エチレン、プロピレン、１－ブテン、１－ペンテン、１－ヘキセン、３－メチル－１－ブテン、３－メチル－１－ペンテン、３－エチル－１－ペンテン、４－メチル－１－ペンテン、４－メチル－１－ヘキセン、４，４－ジメチル－１－ヘキセン、４，４－ジメチル－１－ペンテン、４－エチル－１－ヘキセン、３－エチル－１－ヘキセン、１－オクテン、１－デセン、１－ドデセン、１－テトラデセン、１－ヘキサデセン、１－オクタデセン、１－エイコセン等が挙げられる。より優れた耐熱性、機械的特性および光学特性を有する光学部品得る観点から、これらのなかでも、エチレンとプロピレンが好ましく、エチレンが特に好ましい。上記一般式（Ｉａ）で表されるオレフィンモノマーは２種類以上を用いてもよい。
本実施形態に係る環状オレフィン共重合体を構成する構成単位の全体を１００モル％としたとき、オレフィン由来の繰り返し単位（ａ）の割合が、好ましくは５モル％以上９５モル％以下、より好ましくは２０モル％以上９０モル％以下、さらに好ましくは４０モル％以上８５モル％以下、特に好ましくは５０モル％以上８０モル％以下である。
なお、オレフィン由来の繰り返し単位（ａ）の割合は、^１３Ｃ－ＮＭＲによって測定することができる。

In general formula (Ia) above, R ³⁰⁰ represents a hydrogen atom or a linear or branched hydrocarbon group having 1 to 29 carbon atoms. Examples of the olefin monomer represented by the general formula (Ia) include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 3-methyl-1-butene, 3-methyl-1-pentene, 3 -ethyl-1-pentene, 4-methyl-1-pentene, 4-methyl-1-hexene, 4,4-dimethyl-1-hexene, 4,4-dimethyl-1-pentene, 4-ethyl-1-hexene , 3-ethyl-1-hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene and the like. Among these, ethylene and propylene are preferred, and ethylene is particularly preferred, from the viewpoint of obtaining an optical component having superior heat resistance, mechanical properties and optical properties. Two or more kinds of olefin monomers represented by the general formula (Ia) may be used.
The ratio of the olefin-derived repeating unit (a) is preferably 5 mol% or more and 95 mol% or less, and more preferably 100 mol% of the total structural units constituting the cyclic olefin copolymer according to the present embodiment. is 20 mol % or more and 90 mol % or less, more preferably 40 mol % or more and 85 mol % or less, and particularly preferably 50 mol % or more and 80 mol % or less.
The proportion of olefin-derived repeating units (a) can be measured by ¹³ C-NMR.

The cyclic olefin monomer (b), which is one of the raw materials for copolymerization of the copolymer (A1) according to the present embodiment, is addition-copolymerized to give the above general formula (II), the above general formula (III), or the above general formula ( It forms the repeating unit (b) derived from the cyclic olefin represented by IV). Specifically, the cyclic olefins represented by the general formulas (IIa), (IIIa), and (IVa) corresponding to the general formula (II), the general formula (III), and the general formula (IV), respectively A monomer (b) is used.

上記一般式（ＩＩａ）において、ｕは０または１であり、ｖは０または正の整数、好ましくは０以上２以下の整数、より好ましくは０または１であり、ｗは０または１であり、Ｒ^６１～Ｒ^７８ならびにＲ^ａ１およびＲ^ｂ１は、互いに同一でも異なっていてもよく、水素原子、ハロゲン原子、炭素原子数１～２０のアルキル基、炭素原子数１～２０のハロゲン化アルキル基、炭素原子数３～１５のシクロアルキル基、または炭素原子数６～２０の芳香族炭化水素基であり、Ｒ^７５～Ｒ^７８は、互いに結合して単環または多環を形成していてもよい。

In the above general formula (IIa), u is 0 or 1, v is 0 or a positive integer, preferably an integer of 0 or more and 2 or less, more preferably 0 or 1, w is 0 or 1, R ⁶¹ to R ⁷⁸ , R ^a1 and R ^b1 may be the same or different, and may be a hydrogen atom, a halogen atom, an alkyl group having 1 to 20 carbon atoms, a halogenated alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 15 carbon atoms or an aromatic hydrocarbon group having 6 to 20 carbon atoms, and R ⁷⁵ to R ⁷⁸ may be bonded together to form a monocyclic or polycyclic ring; .

上記一般式（ＩＩＩａ）において、ｘおよびｄは０または１以上の整数、好ましくは０以上２以下の整数、より好ましくは０または１であり、ｙおよびｚは０、１または２であり、Ｒ^８１～Ｒ^９９は、互いに同一でも異なっていてもよく、水素原子、ハロゲン原子、炭素原子数１～２０のアルキル基若しくは炭素原子数３～１５のシクロアルキル基である脂肪族炭化水素基、炭素原子数６～２０の芳香族炭化水素基またはアルコキシ基であり、Ｒ^８９およびＲ^９０が結合している炭素原子と、Ｒ^９３が結合している炭素原子またはＲ^９１が結合している炭素原子とは、直接あるいは炭素原子数１～３のアルキレン基を介して結合していてもよく、またｙ＝ｚ＝０のとき、Ｒ^９５とＲ^９２またはＲ^９５とＲ^９９とは互いに結合して単環または多環の芳香族環を形成していてもよい。

In the general formula (IIIa), x and d are 0 or an integer of 1 or more, preferably an integer of 0 or more and 2 or less, more preferably 0 or 1, y and z are 0, 1 or 2, and R ⁸¹ to R ⁹⁹ may be the same or different, and may be a hydrogen atom, a halogen atom, an aliphatic hydrocarbon group which is an alkyl group having 1 to 20 carbon atoms or a cycloalkyl group having 3 to 15 carbon atoms, carbon an aromatic hydrocarbon group or an alkoxy group having 6 to 20 atoms, the carbon atom to which R ⁸⁹ and R ⁹⁰ are bonded and the carbon atom to which R ⁹³ is bonded or the carbon atom to which R ⁹¹ is bonded may be bonded directly or through an alkylene group having 1 to 3 carbon atoms, and when y = z = 0, R ⁹⁵ and R ⁹² or R ⁹⁵ and R ⁹⁹ are bonded to each other It may form a monocyclic or polycyclic aromatic ring.

上記一般式（ＩＶａ）において、Ｒ^１００、Ｒ^１０１は、互いに同一でも異なっていてもよく、水素原子または炭素原子数１～５の炭化水素基を示し、ｆは１≦ｆ≦１８である。

In general formula (IVa) above, R ¹⁰⁰ and R ¹⁰¹ may be the same or different, each represents a hydrogen atom or a hydrocarbon group having 1 to 5 carbon atoms, and f satisfies 1≦f≦18.

By using the olefin monomer represented by the general formula (Ia) or the cyclic olefin monomer (b) represented by the general formula (IIa), (IIIa) or (IVa) as a copolymerization component, a cyclic olefin-based Since the solubility of the polymer (A) in the solvent is further improved, the moldability is improved, and the product yield is improved.

As specific examples of the cyclic olefin monomer (b) represented by general formula (IIa), (IIIa) or (IVa), compounds described in paragraphs 0037 to 0063 of WO 2006/118261 can be used.

Specifically, bicyclo-2-heptene derivatives (bicyclohept-2-ene derivatives), tricyclo-3-decene derivatives, tricyclo-3-undecene derivatives, tetracyclo-3-dodecene derivatives, pentacyclo-4-pentadecene derivatives, pentacyclo pentadecadiene derivative, pentacyclo-3-pentadecene derivative, pentacyclo-4-hexadecene derivative, pentacyclo-3-hexadecene derivative, hexacyclo-4-heptadecene derivative, heptacyclo-5-eicosene derivative, heptacyclo-4-eicosene derivative, heptacyclo-5 -heneicosene derivatives, octacyclo-5-docosene derivatives, nonacyclo-5-pentacosene derivatives, nonacyclo-6-hexacosene derivatives, cyclopentadiene-acenaphthylene adducts, 1,4-methano-1,4,4a,9a-tetrahydrofluorene derivatives, 1,4-methano-1,4,4a,5,10,10a-hexahydroanthracene derivatives, cycloalkylene derivatives having 3 to 20 carbon atoms, and the like.

Among the cyclic olefin monomers (b) represented by general formula (IIa), (IIIa) or (IVa), cyclic olefins represented by general formula (IIa) are preferred.

Bicyclo[2.2.1]-2-heptene (also referred to as norbornene), tetracyclo[4.4.0.1 ^2,5 . 1 ^7,10 ]-3-dodecene (also called tetracyclododecene) is preferably used, and tetracyclo[4.4.0.1 ^2,5 . 1 ^7,10 ]-3-dodecene is more preferably used. Since these cyclic olefins have a rigid ring structure, there is an advantage that the elastic modulus of the copolymer and the optical parts can be easily maintained.

The ratio of the repeating unit (b) derived from the cyclic olefin monomer (b) is preferably 5 mol% or more and 95 mol % or less, more preferably 10 mol % or more and 80 mol % or less, still more preferably 15 mol % or more and 60 mol % or less, and particularly preferably 20 mol % or more and 50 mol % or less.

Although the copolymerization type of the copolymer (A1) according to the present embodiment is not particularly limited, examples thereof include random copolymers and block copolymers. In the present embodiment, the copolymer (A1) according to the present embodiment has excellent optical properties such as transparency, refractive index, and birefringence, and is capable of obtaining a highly accurate optical component. It is preferred to use polymers.

As the copolymer (A1) according to the present embodiment, ethylene and tetracyclo[4.4.0.1 ^2,5 . 1 ^7,10 ]-3-dodecene and random copolymers of ethylene and bicyclo[2.2.1]-2-heptene, preferably ethylene and tetracyclo[4.4. 0.1 ^2,5 . A random copolymer with 1 ^7,10 ]-3-dodecene is more preferred.

As the cyclic olefin polymer (A), a ring-opening polymer (A2) of cyclic olefin can be used.
Examples of the cyclic olefin ring-opening polymer (A2) include ring-opening polymers of norbornene-based monomers and ring-opening weights of norbornene-based monomers and other monomers capable of ring-opening copolymerization thereof. coalescence, hydrides thereof, and the like.

Examples of norbornene-based monomers include, for example, bicyclo[2.2.1]hept-2-ene (common name: norbornene) and derivatives thereof (having a substituent on the ring), tricyclo[ ^{4.3.01 , 6} . 1 ^2,5 ]deca-3,7-diene (common name dicyclopentadiene) and its derivatives, 7,8-benzotricyclo[4.3.0.1 ^2,5 ]dec-3-ene (common name methanotetrahydrofluorene: 1,4-methano-1,4,4a,9a-tetrahydrofluorene) and its derivatives, tetracyclo[4.4.0.1 ^2,5 . 1 ^7,10 ]-3-dodecene (common name: tetracyclododecene) and derivatives thereof.
Examples of substituents on the ring of these derivatives include alkyl groups, alkylene groups, vinyl groups, alkoxycarbonyl groups, and alkylidene groups. In addition, the substituent can have 1 or 2 or more. Derivatives having a substituent on such a ring include, for example, 8-methoxycarbonyl-tetracyclo[4.4.0.1 ^2,5 . 1 ^7,10 ]dodeca-3-ene, 8-methyl-8-methoxycarbonyl-tetracyclo[4.4.0.1 ^2,5 . 1 ^7,10 ]dodeca-3-ene, 8-ethylidene-tetracyclo[4.4.0.1 ^2,5 . 1 ^7,10 ]dodeca-3-ene and the like.
These norbornene-based monomers may be used alone or in combination of two or more.

A ring-opening polymer of a norbornene-based monomer, or a ring-opening polymer of a norbornene-based monomer and other monomers capable of ring-opening copolymerization with the monomer component is prepared by a known ring-opening polymerization. It can be obtained by polymerization in the presence of a catalyst.
The ring-opening polymerization catalyst includes, for example, a metal halide such as ruthenium and osmium, a nitrate or an acetylacetone compound, and a reducing agent; , an organoaluminum compound; and the like.
Other monomers capable of ring-opening copolymerization with norbornene monomers include, for example, monocyclic cyclic olefin monomers such as cyclohexene, cycloheptene, and cyclooctene.

A hydride of a ring-opening polymer of a norbornene-based monomer, or a hydride of a ring-opening polymer of a norbornene-based monomer and another monomer capable of ring-opening copolymerization thereof is usually the above ring-opening It can be obtained by adding a known hydrogenation catalyst containing a transition metal such as nickel or palladium to a polymerization solution of the polymer to hydrogenate the carbon-carbon unsaturated bond.

In the present embodiment, the cyclic olefin polymer (A) may be used singly or in combination of two or more.

The copolymer (A1) according to the present embodiment is, for example, JP-A-60-168708, JP-A-61-120816, JP-A-61-115912, JP-A-61-115916. , JP-A-61-271308, JP-A-61-272216, JP-A-62-252406, JP-A-62-252407, etc. Producing by appropriately selecting conditions according to the method can be done.
The ring-opening polymer (A2) of a cyclic olefin according to the present embodiment is, for example, JP-A-60-26024, JP-A-9-268250, JP-A-63-145324, JP-A-2001-72839. It can be produced by appropriately selecting the conditions according to the method disclosed in JP-A-2003-203215.

The glass transition temperature (Tg) of the resin composition containing the cyclic olefin polymer (A) according to this embodiment is preferably in the range of 130°C or higher and 160°C or lower. When the resin composition containing the cyclic olefin polymer (A) has a glass transition temperature (Tg) within the above range, it is used as an optical component that requires heat resistance, such as a vehicle-mounted camera lens or a camera lens for mobile devices. In addition, sufficient heat resistance can be obtained, and good moldability can be obtained.

The glass transition temperature (Tg) of the resin composition containing the cyclic olefin polymer (A) according to this embodiment can be measured using, for example, a differential scanning calorimeter (DSC). For example, using RDC220 manufactured by SII Nano Technology Co., Ltd., the temperature is raised from room temperature to 200°C at a temperature increase rate of 10°C/min in a nitrogen atmosphere, held for 5 minutes, and then cooled to 30°C at a temperature decrease rate of 10°C/min. After the temperature is lowered, the temperature is held for 5 minutes, and then the glass transition temperature can be measured when the temperature is raised to 200°C at a temperature elevation rate of 10°C/min.

(fatty acid ester)
It is preferable that the resin composition constituting the optical component according to this embodiment further contains a fatty acid ester of a fatty acid and a polyhydric alcohol having one or more ether groups. Note that the ether group of the polyhydric alcohol does not include the ether group in the ester group.
By further including a fatty acid ester, deterioration of optical performance under high temperature and high humidity conditions can be suppressed.
Although the reason for this is not clear, the following reasons are conceivable. First, the fatty acid ester has a hydrophilic functional group such as a hydroxyl group, an ether group, or a carbonyl group. Therefore, even when molding is performed under high-temperature and high-humidity conditions, it is presumed that the water absorbed in the optical component is dispersed, and aggregation of water that causes degradation of optical performance is suppressed. It is thought that the deterioration of optical performance under high-temperature and high-humidity conditions is suppressed as a result of suppression of aggregation of water that causes deterioration of optical performance.

Examples of polyhydric alcohols having one or more ether groups include diglycerin, triglycerin, tetraglycerin, and sorbitan. Among these, diglycerin and triglycerin are preferred, and triglycerin is particularly preferred from the viewpoint of further suppressing the occurrence of weld lines.
In this embodiment, the fatty acid ester is preferably a glycerin fatty acid ester, more preferably at least one selected from diglycerin fatty acid esters and triglycerin fatty acid esters. A diglycerin fatty acid ester is obtained by esterifying at least one of the four hydroxy groups contained in diglycerin with a fatty acid. Triglycerin fatty acid ester is obtained by esterifying at least one of the five hydroxy groups contained in triglycerin with a fatty acid.

Fatty acids include saturated fatty acids such as butanoic acid, pentanoic acid, hexanoic acid, heptanoic acid, octanoic acid, nonanoic acid, capric acid, lauric acid, myristic acid, palmitic acid, and stearic acid; crotonic acid, myristoleic acid, palmitoleic acid; , sapienic acid, oleic acid, elaidic acid, gadoleic acid, eicosenoic acid, and other monounsaturated fatty acids; linoleic acid, eicosadienoic acid, docosadienoic acid, and other diunsaturated fatty acids; triunsaturated fatty acids such as enoic acid; tetraunsaturated fatty acids such as stearidonic acid, arachidonic acid and eicosatetraenoic acid; and the like.

Diglycerin fatty acid esters include diglycerin monocaprylate, diglycerin dicaprylate, diglycerin monocaprate, diglycerin dicaprate, diglycerin monolaurate, diglycerin dilaurate, diglycerin monomyristate, and diglycerin dimyristate. , diglycerin monopalmitate, diglycerin dipalmitate, diglycerin monostearate, diglycerin distearate, diglycerin monobehenate, diglycerin dibehenate; diglycerin unsaturated fatty acid esters such as glycerin dioleate; and the like, and one or more selected from these can be used in combination.
In this embodiment, the diglycerin fatty acid ester is preferably an ester of diglycerin and a saturated or unsaturated fatty acid having 12 to 18 carbon atoms selected from the above.

Triglycerin fatty acid esters include triglycerin monocaprylate, triglycerin dicaprylate, triglycerin tricaprylate, triglycerin monocaprate, triglycerin dicaprate, triglycerin tricaprate, triglycerin monolaurate, triglycerin dilaurate, Triglycerin Trilaurate, Triglycerin Monomyristate, Triglycerin Dimyristate, Triglycerin Trimyristate, Triglycerin Monopalmitate, Triglycerin Dipalmitate, Triglycerin Tripalmyrate, Triglycerin Monostearate, Triglycerin Triglycerin saturated fatty acid esters such as distearate, triglycerin tristearate, triglycerin monobehenate, triglycerin dibehenate, triglycerin tribehenate; triglycerin monooleate, triglycerin dioleate, triglycerin trioleate Triglycerin unsaturated fatty acid esters such as;

The glycerin fatty acid ester according to the present embodiment preferably contains an ester of triglycerin or diglycerin and a saturated or unsaturated fatty acid having 8 to 24 carbon atoms, and triglycerin or diglycerin and 12 to 18 carbon atoms. More preferably, it contains esters with saturated or unsaturated fatty acids.

In the optical component according to the present embodiment, when the cyclic olefin polymer (A) contained in the resin composition constituting the optical component is 100 parts by mass, the lower limit of the content of the fatty acid ester in the resin composition is preferably 0.05 parts by mass or more, more preferably 0.1 parts by mass or more, and 0.2 parts by mass from the viewpoint of further suppressing deterioration of optical performance under high temperature and high humidity conditions. It is more preferably 0.3 parts by mass or more, and particularly preferably 0.3 parts by mass or more.
In addition, the upper limit of the content of the triglycerin fatty acid ester in the resin composition is 1.2 mass from the viewpoint of suppressing the gasification amount of the triglycerin fatty acid ester during molding and further suppressing the occurrence of weld lines. parts by mass or less, more preferably 1.0 parts by mass or less, even more preferably 0.9 parts by mass or less, even more preferably 0.8 parts by mass or less, and 0.8 parts by mass or less. It is particularly preferable that it is 7 parts by mass or less.
In addition, triglycerin fatty acid esters have a larger amount of hydrophilic groups than diglycerin fatty acid esters, monoglycerin fatty acid esters, and the like, so it is thought that deterioration of optical performance under high-temperature and high-humidity conditions can be suppressed with a smaller addition amount. In addition, since the amount added can be reduced, the gasification amount of the triglycerol fatty acid ester during molding can be further suppressed, and the occurrence of weld lines can be further suppressed. Therefore, triglycerin fatty acid ester is particularly preferable as the fatty acid ester.

Examples of the glycerin fatty acid ester according to the present embodiment include a single monoester, a mixture of a monoester and a diester, a mixture of a monoester, a diester and a triester, and the like.

(other ingredients)
In addition to the cyclic olefin-based polymer (A) and the fatty acid ester, the resin composition constituting the optical component according to the present embodiment contains optional components within a range that does not impair the good physical properties of the optical component according to the present embodiment. It is possible to contain additives known as
Examples of additives include antioxidants, secondary antioxidants, lubricants, release agents, antifog agents, weather stabilizers, light stabilizers, ultraviolet absorbers, antistatic agents, metal deactivators, and the like. mentioned.

The optical component according to this embodiment can be obtained by molding a cyclic olefin resin composition containing the cyclic olefin polymer (A) into a predetermined shape. The method for obtaining an optical component by molding the cyclic olefin resin composition is not particularly limited, and known methods can be used. Depending on the application and shape, for example, extrusion molding, injection molding, inflation molding, blow molding, extrusion blow molding, injection blow molding, press molding, vacuum molding, powder slush molding, calendar molding, foam molding, etc. can be applied. is. Among these, the injection molding method is preferable from the viewpoint of moldability and productivity. Molding conditions are appropriately selected depending on the purpose of use or the molding method. For example, the resin temperature in injection molding is usually 150°C to 400°C, preferably 200°C to 350°C, more preferably 230°C to 330°C. It is selected appropriately within the range.

The cyclic olefin-based resin composition according to the present embodiment is prepared by, for example, mixing the cyclic olefin-based polymer (A) and other components added as necessary using a known kneading device such as an extruder and a Banbury mixer. A method of melt-kneading; a method of dissolving the cyclic olefin polymer (A) and other components added as necessary in a common solvent and then evaporating the solvent; ) and a method of precipitation by adding a solution of other components added as necessary;

Although the embodiments of the present invention have been described above, these are examples of the present invention, and various configurations other than those described above can also be adopted.
Moreover, the present invention is not limited to the above-described embodiments, and includes modifications, improvements, etc. within the scope of achieving the object of the present invention.

EXAMPLES The present invention will be described in more detail below with reference to examples, but the present invention is not limited by these examples.

<Synthesis of resin A>
(Preparation of catalyst)
VO(OC ₂ H ₅ )Cl ₂ was diluted with cyclohexane to prepare a vanadium catalyst with a vanadium concentration of 6.7 mmol/L-cyclohexane. Ethyl aluminum sesquichloride (Al(C ₂ H ₅ ) _1.5 Cl _1.5 ) was diluted with cyclohexane to prepare an organoaluminum compound catalyst having an aluminum concentration of 107 mmol/L-hexane.

(polymerization)
Ethylene and tetracyclo[4.4.0.1 ^2,5 . 1 ^7,10 ]-3-dodecene was copolymerized. Here, ethylene was supplied into the polymerization vessel together with hydrogen gas.
When carrying out this copolymerization reaction, the vanadium catalyst prepared by the above method was added to the polymerization vessel in such an amount that the vanadium catalyst concentration relative to cyclohexane in the polymerization vessel used as the polymerization solvent was 0.6 mmol/L. supplied inside.
Further, ethylaluminum sesquichloride, which is an organoaluminum compound, was fed into the polymerization vessel in such an amount that Al/V=18.0. The copolymerization reaction was continuously carried out at a polymerization temperature of 8°C and a polymerization pressure of 1.8 kg/cm ² G.

(Decalcification)
Ethylene and tetracyclo[4.4.0.1 ^2,5 . 1 ^7,10 ]-3-dodecene was added with water and a NaOH solution having a concentration of 25 mass % as a pH adjuster to terminate the polymerization reaction. Further, catalyst residues present in the copolymer were removed (deashed) from this copolymer solution (polymer solution A).
Ethylene and tetracyclo[4.4.0.1 ^2,5 . Pentaerythrityl- ^tetrakis [3-(3,5-di-t -Butyl-4-hydroxyphenyl)propionate] was added in an amount of 0.4 parts by mass per 100 parts by mass of the copolymer. Then, they were once mixed for 1 hour using a stirring tank with an effective volume of 1.0 m ³ before entering the flash drying process.

(Desolvation)
A double-tube heater (outer tube diameter 2B, inner tube diameter 3/4B, length 21m) using steam of 20 kg/cm ² G as a heat source was used to heat the copolymer in the cyclohexane solution to a concentration of 5% by mass. 150 kg/h of the cyclohexane solution of the above copolymer was supplied and heated to 180°C.
A double-tube flash dryer (outer tube diameter: 2B, inner tube diameter: 3/4B, length: 27m) using steam of 25 kg/cm ² G as a heat source and a flash hopper (volume: 200 L) were used to perform the above heating. Ethylene and tetracyclo[4.4.0.1 ^2,5 . A random copolymer (resin A) with 1 ^7,10 ]-3-dodecene was obtained.

[Example 1]
<Preparation of resin composition>
(Extrusion)
Using a vented twin-screw kneading extruder, the melted resin A was charged from the resin charging port of the extruder. Next, for the purpose of removing volatile substances from the vent portion, while sucking with a vacuum pump through a trap, a distilled diglycerin fatty acid ester (distilled diglycerin fatty acid ester, which is an ester of diglycerin and oleic acid) was added to the cylinder portion downstream of the vent portion while sucking with a vacuum pump. Rikemal DO-100 (manufactured by Riken Vitamin Co., Ltd.) was added in an amount of 0.60 parts by mass to 100 parts by mass of Resin A, and kneaded and mixed downstream from the vent section of the extruder. At this time, the extruder conditions were adjusted so that the difference between the maximum value and the minimum value of the extruder diverter part resin temperature was within 3°C. Then, it was pelletized by an underwater pelletizer attached to the outlet of the extruder, and the obtained pellets were dried with hot air at a temperature of 100°C for 4 hours. Furthermore, in order to suppress the contamination of iron atoms (Fe), the polymer production equipment uses stainless steel pipes and polymerization equipment, and the amount of resin that is calculated from the average residence time in the polymerization vessel is about 3 to 5 times. A resin composition A was obtained by carrying out an operation of flowing for washing (purging) and then collecting a sample. Based on ASTM D3835 of the obtained resin composition, using a capillary die with length L = 8.00 mm, inner diameter D = 2.095 mm, L / D = 3.82, 260 ° C., extrusion speed 15 mm / min, Table 1 shows the melt tension measured at a take-up speed of 15 m/min and the glass transition temperature (Tg) measured at a heating rate of 10°C/min using a differential scanning calorimeter (DSC).
The diglycerin fatty acid ester was placed in a container and heated at 85° C. for 10 hours before use. The same applies to other methods for producing resin compositions.

<Synthesis of Resin B to Resins F and H>
Ethylene and tetracyclo[4.4.0.1 ^2,5 . 1 ^7,10 ]-3-dodecene and the ratio of the hydrogen feed amount to the ethylene feed amount were adjusted to synthesize Resins B to Resin F and Resin H in the same manner as for Resin A.

[Examples 2 to 3, 6 and Comparative Example 1]
As shown in Table 2, resin compositions B to D and H were prepared in the same manner as in Example 1, except that Resin B to Resin D and Resin H were used instead of Resin A. Table 1 shows the glass transition temperature (Tg) and melt tension at 260° C. of Resin Compositions BD and H.

[Example 4 and Comparative Example 2]
As shown in Table 2, resin E and resin F were used instead of resin A, and the blending amount of diglycerin fatty acid ester was changed to 0.80 parts by mass with respect to 100 parts by mass of resin E or resin F. Resin compositions E and F were prepared in the same manner as in Example 1, respectively. Table 1 shows the glass transition temperature (Tg) and melt tension at 260° C. of Resin Compositions E and F.

[Example 5]
As shown in Table 2, a resin composition G was prepared in the same manner as in Example 1 except that resin A was used and diglycerin fatty acid ester was not blended. Table 1 shows the glass transition temperature (Tg) of Resin Composition G and the melt tension at 260°C.

The optical components obtained from the resin compositions of Examples 1-6 and Comparative Examples 1-2 were evaluated by the following evaluation methods. Table 2 shows the evaluation results.

(Evaluation method for optical components)
(1) Refractive index Using an injection molding machine (Roboshot S2000i-30α manufactured by Fanuc Corporation), the resin compositions obtained in Examples and Comparative Examples were injection molded under the conditions of a cylinder temperature of 275°C and a mold temperature of 120°C. , and a test piece having an optical surface of 35 mm×65 mm×thickness 3 mmt. Then, using a refractometer (Shimadzu Science KPR200), the refractive index (nd) of the test piece at 25° C. and a wavelength of 589 nm was measured according to ASTM D542.

(2) Retardation Using an injection molding machine (ROBOSHOT S2000i-30α manufactured by Fanuc Corporation), the resin compositions obtained in Examples and Comparative Examples were injection molded under the conditions of a cylinder temperature of 275°C and a mold temperature of 120°C. , and a test piece having an optical surface of 35 mm×65 mm×thickness 3 mmt. Then, using a KOBRA CCD, the average value of the phase difference of the test pieces 20 to 35 mm from the gate direction was obtained at a measurement wavelength of 650 nm.

(3) Using a haze injection molding machine (ROBOSHOT S2000i-30α manufactured by Fanuc Corporation), the resin compositions obtained in Examples and Comparative Examples are injection molded under the conditions of a cylinder temperature of 275 ° C. and a mold temperature of 120 ° C., A test piece having an optical surface of 35 mm×65 mm×thickness of 3 mm was produced. The internal haze of the optical component was measured using benzyl alcohol according to JIS K-7105.

(4) Environmental Test The test piece having an optical surface of 35 mm×65 mm×thickness 3 mmt obtained above was left in an atmosphere of 80° C. temperature and 90% relative humidity for 48 hours. Then, the haze was measured 3 hours after taking out.

(5) Weld line evaluation test (5.1) Fabrication of optical components (5.1.1) Examples 1 to 3, 6 and Comparative Example 1
The outer diameter is 6.2 mm, the diameter of the lens portion is 5.0 mm, the center thickness (minimum thickness) is 0.35 mm, the maximum thickness is 0.944 mm, the ratio of the maximum thickness T _max to the minimum thickness T _min (T _max /T using a mold and an injection molding machine (FANUC ROBOSHOT S2000i-30α) for forming a lens (lens having a shape shown in FIG. 1(a)) with a thickness deviation ratio ₎ of 2.7, the cylinder temperature The resin compositions obtained in Examples 1 to 3 and 6 and Comparative Example 1 were injection molded under the conditions of 275° C., mold temperature Tg-5° C., holding pressure 100 MPa, and injection speed 30 mm/s. made individually.
(5.1.2) Examples 4-5, Comparative Example 2
The outer diameter is 6.2 mm, the diameter of the lens portion is 5.0 mm, the center thickness (minimum thickness) is 0.35 mm, the maximum thickness is 0.944 mm, the ratio of the maximum thickness T _max to the minimum thickness T _min (T _max /T using a mold and an injection molding machine (FANUC ROBOSHOT S2000i-30α) for forming a lens (lens having a shape shown in FIG. 1(a)) with a thickness deviation ratio ₎ of 2.7, the cylinder temperature The resin compositions obtained in Examples 4 to 5 and Comparative Example 2 were injection molded under the conditions of 295°C, mold temperature of 150°C, holding pressure of 100 MPa, and injection speed of 80 mm/s to prepare ten optical components. .
(5.2) Evaluation of Weld Line The obtained optical component was observed with a laser microscope (VK-X100 manufactured by Keyence Corporation), and the length of the weld line generated on the opposite side of the gate was measured and evaluated according to the following criteria. . If the length of the weld line is 1200 μm or more, it will enter the portion used as the lens (optically effective surface), which will affect the optical performance.
◎: The length of the weld line is less than 800 μm ○: The length of the weld line is 800 μm or more and less than 1200 μm ×: The length of the weld line is 1200 μm or more

Claims (7)

An optical component made of a resin composition containing a cyclic olefin polymer (A),
The cyclic olefin polymer (A) contains a copolymer (A1) of ethylene or an α-olefin and a cyclic olefin,
The copolymer (A1) is
at least one olefin-derived repeating unit (a) represented by the following general formula (I);
At least one cyclic olefin selected from the group consisting of repeating units represented by the following general formula (II), repeating units represented by the following general formula (III), and repeating units represented by the following general formula (IV) a repeating unit (b) derived from
has
When the maximum thickness of the optical component is T _max and the minimum thickness of the optical component is T _min ,
The uneven thickness ratio indicated by T _max /T _min is 2.0 or more,
Measured in accordance with ASTM D3835, using a capillary die with length L = 8.00 mm, inner diameter D = 2.095 mm, and L/D = 3.82 at 260°C, extrusion speed 15 mm/min, and take-up speed 15 m/min. The melt tension of the resin composition containing the cyclic olefin polymer (A) is 4.5 mN or more and 15.0 mN or less,
an f-theta lens, an imaging lens, a sensor lens, a prism or a light guide plate ,
The olefin-derived repeating unit (a) in the copolymer (A1) contains an ethylene-derived repeating unit,
The ratio of the repeating unit derived from ethylene is 40 mol% or more and 85 mol% or less when the total of the structural units constituting the copolymer (A1) is 100 mol%,
An optical component , wherein the proportion of the repeating unit (b) derived from the cyclic olefin monomer is 15 mol % or more and 60 mol % or less .

(In general formula (I) above, R ³⁰⁰ represents a hydrogen atom or a linear or branched hydrocarbon group having 1 to 29 carbon atoms.)

(In general formula (II) above, u is 0 or 1, v is 0 or a positive integer, w is 0 or 1, and R ⁶¹ to R ⁷⁸ and R ^a1 and R ^b1 are the same hydrogen atom, halogen atom, alkyl group having 1 to 20 carbon atoms, halogenated alkyl group having 1 to 20 carbon atoms, cycloalkyl group having 3 to 15 carbon atoms or 6 carbon atoms to 20 aromatic hydrocarbon groups, and R ⁷⁵ to R ⁷⁸ may be bonded together to form a monocyclic or polycyclic ring.)

(In the above general formula (III), x and d are 0 or an integer of 1 or more, y and z are 0, 1 or 2, R ⁸¹ to R ⁹⁹ may be the same or different, a hydrogen atom, a halogen atom, an alkyl group having 1 to 20 carbon atoms, an aliphatic hydrocarbon group having 3 to 15 carbon atoms or a cycloalkyl group having 3 to 15 carbon atoms, an aromatic hydrocarbon group having 6 to 20 carbon atoms, or an alkoxy group; and the carbon atom to which R ⁸⁹ and R ⁹⁰ are bonded and the carbon atom to which R ⁹³ is bonded or the carbon atom to which R ⁹¹ is bonded are directly or an alkylene group having 1 to 3 carbon atoms When y=z=0, R ⁹⁵ and R ⁹² or R ⁹⁵ and R ⁹⁹ may be bonded to each other to form a monocyclic or polycyclic aromatic ring. good.)

(In general formula (IV) above, R ¹⁰⁰ and R ¹⁰¹ may be the same or different and represent a hydrogen atom or a hydrocarbon group having 1 to 5 carbon atoms, and f is an integer of 1 ≤ f ≤ 18. is.) The optical component according to claim 1,
An optical component, wherein the glass transition temperature of the resin composition containing the cyclic olefin polymer (A) is in the range of 130°C or higher and 160°C or lower. The optical component according to claim 1 or 2,
An optical component that is an in-vehicle camera lens or a camera lens for mobile devices. In the optical component according to any one of claims 1 to 3,
The repeating unit (b) derived from the cyclic olefin in the copolymer (A1) is bicyclo[2.2.1]-2-heptene and tetracyclo[4.4.0.1 ^2,5 . 1 ^7,10 ]-3-dodecene, comprising repeating units derived from at least one compound selected from the group consisting of: The optical component according to any one of claims 1 to 4 ,
An optical component, wherein the resin composition further comprises a fatty acid ester of a fatty acid and a polyhydric alcohol having one or more ether groups. In the optical component according to claim 5 ,
When the cyclic olefin polymer (A) contained in the resin composition constituting the optical component is 100 parts by mass, the content of the fatty acid ester in the resin composition is 0.05 parts by mass or more. .2 parts by mass or less optical components. The optical component according to claim 5 or 6 ,
The optical component, wherein the fatty acid ester comprises a glycerin fatty acid ester.

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