JP2004010674A - Ultraviolet light-curable adhesive - Google Patents

Ultraviolet light-curable adhesive Download PDF

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Publication number
JP2004010674A
JP2004010674A JP2002163311A JP2002163311A JP2004010674A JP 2004010674 A JP2004010674 A JP 2004010674A JP 2002163311 A JP2002163311 A JP 2002163311A JP 2002163311 A JP2002163311 A JP 2002163311A JP 2004010674 A JP2004010674 A JP 2004010674A
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Japan
Prior art keywords
epoxy compound
curable adhesive
adhesive
epoxy resin
naphthalene skeleton
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
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JP2002163311A
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Japanese (ja)
Inventor
Hideyuki Usui
薄井 英之
Takashi Fukushima
福島 喬
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Nitto Denko Corp
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Nitto Denko Corp
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Filing date
Publication date
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Priority to JP2002163311A priority Critical patent/JP2004010674A/en
Publication of JP2004010674A publication Critical patent/JP2004010674A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To obtain an ultraviolet light-curable adhesive which has a stable adhesive force even under the conditions of high temperature and high humidity, is transparent, and has high dimensional stability and excellent adhesiveness to optical elements, optical parts, and the like. <P>SOLUTION: This ultraviolet light-curable adhesive comprises the following (A) and (B). (A) is an epoxy compound comprises the following (a1) and (a2). The (a1) is an epoxy compound having a naphthalene skeleton. The (a2) is a resorcinol type epoxy compound. (B) is a photopolymerization initiator. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、アライメント等に必要とされる適度な透明性と優れた接着力を有し、アウトガス(高温条件下で揮発するガス)の発生が低く、低吸湿性であり、光ファイバーコネクタに用いられる石英系ガラス同士の接合やファイバーアレイの固定、また、光導波路(Alley Wave Guide:AWG)、Vグルーヴ等の光素子、光部品の基板への接合を行うのに好適な接着剤に関するものである。すなわち、過酷な温湿度下であっても劣化しない接着性を有する、光素子や光部品固定用の紫外線硬化型接着剤に関するものである。
【0002】
【従来の技術】
近年、精密な光ファイバーコネクタ部品の組立においては、接着剤を使用する方法が用いられるようになってきた。この組立の際には、ミクロンオーダーの固定精度が必要とされることから、接着剤に関し、短時間硬化とともに、石英ガラスや光ファイバーに対する優れた接着性、さらに長期信頼性の観点から高温高湿環境下に置かれても優れた接着性を保持することが要望されていた。また、位置決めのためのアライメントマークやファイバー視認性から透明なものが使用されており、加えて光学部品が熱応力を嫌うため、紫外線硬化等の光硬化型接着剤が多く用いられている。
【0003】
【発明が解決しようとする課題】
従来のエポキシ系樹脂を用いたカチオン重合型光硬化接着剤は、比較的接着性に優れているが、石英ガラスや光ファイバーに対する接着性において、特に高温高湿度下での使用においては吸水率が高いことによりその接着力の低下が大きく、満足のいくものではなかった。一方、アクリル系樹脂を用いたラジカル重合型光硬化接着剤は、一般的には、接着力の安定性は高いが硬化収縮が大きいことやガラス転移温度が低いこと等から寸法安定性、耐熱性において満足できるものではなかった。
【0004】
本発明は、このような事情に鑑みなされたもので、高温高湿条件下でも安定した接着力を有し、透明で寸法安定性が高く、光素子や光部品等に対する接着性に優れた紫外線硬化型接着剤の提供をその目的とする。
【0005】
【課題を解決するための手段】
上記の目的を達成するため、本発明の紫外線硬化型接着剤は、下記の(A)および(B)を含有するという構成をとる。
(A)下記の(a1)および(a2)を含有するエポキシ樹脂。
(a1)ナフタレン骨格を有するエポキシ化合物。
(a2)レゾルシン型エポキシ化合物。
(B)光重合開始剤。
【0006】
すなわち、本発明者らは、適度な透明性と低吸湿性を有し、光素子や光部品等の接着性に優れた光硬化型の接着剤を得るために検討を行った。そして、従来のエポキシ系樹脂の光硬化型接着剤の欠点であった高温高湿下での高吸水率化による接着力の低下を改善すべく一連の研究を重ねた。その結果、エポキシ樹脂成分としてナフタレン骨格を有するエポキシ化合物(a1)およびレゾルシン型エポキシ化合物(a2)とを併用すると、優れた透明性と低吸湿性とを備え、かつ高温高湿下での接着性に優れた接着剤が得られることを見出し本発明に到達した。
【0007】
【発明の実施の形態】
つぎに、本発明の実施の形態について詳しく説明する。
【0008】
本発明の紫外線硬化型接着剤は、ナフタレン骨格を有するエポキシ化合物(a1)とレゾルシン型エポキシ化合物(a2)を含有するエポキシ樹脂(A)と、光重合開始剤(B)とを用いることにより得られる。
【0009】
上記ナフタレン骨格を有するエポキシ化合物(a1)は、ナフタレン骨格を有するものであれば特に限定するものではないが、室温で液状のものを用いることが作業性の観点からも好ましい。好ましくは25℃での粘度が200Pa・s以下、より好ましくは50Pa・s以下である。そして、ナフタレン骨格を有するエポキシ化合物として、具体的には、下記の化学式(4)で表されるものを用いることが好ましい。
【0010】
【化4】

Figure 2004010674
【0011】
また、上記ナフタレン骨格を有するエポキシ化合物(a1)とともに用いられるレゾルシン型エポキシ化合物(a2)としては、特に限定されるものではないが室温で液状のものが作業性の観点から好ましい。好ましくは25℃での粘度が100Pa・s以下、より好ましくは10Pa・s以下である。そして、レゾルシン型エポキシ化合物(a2)として、具体的には、下記の化学式(1)で表されるものを用いることが好ましい。
【0012】
【化5】
Figure 2004010674
【0013】
本発明において、エポキシ樹脂(A)としては、上記ナフタレン骨格を有するエポキシ化合物(a1)およびレゾルシン型エポキシ化合物(a2)のみで構成されていてもよいが、粘度を調整する目的から、上記ナフタレン骨格を有するエポキシ化合物(a1)およびレゾルシン型エポキシ化合物(a2)以外のエポキシ化合物を併用することができる。具体的には、汎用のビスフェノール型エポキシ化合物、水添ビスフェノール型エポキシ化合物、ノボラック型エポキシ化合物、グリシジルエーテル型エポキシ化合物、グリシジルエステル型エポキシ化合物、脂環式エポキシ化合物等を用いることができる。その中でも、下記の一般式(2)で表される脂環式エポキシ化合物や、下記の一般式(3)で表される水添ビスフェノール型エポキシ化合物が、特性を低下させることが少なく好ましい。
【0014】
【化6】
Figure 2004010674
【0015】
【化7】
Figure 2004010674
【0016】
そして、上記ナフタレン骨格を有するエポキシ化合物(a1)およびレゾルシン型エポキシ化合物(a2)を含有するエポキシ樹脂(A)としては、そのエポキシ樹脂成分全体の粘度が0.1〜10Pa・sの範囲に調整することが好ましい。すなわち、0.1Pa・s未満のように粘度が低いと、接合部から接着剤が流出しやすく、また10Pa・sを超え粘度が高いと、接合部の隙間に接着剤が充填されにくいという問題が生じる傾向がみられるからである。
【0017】
また、エポキシ樹脂(A)中の上記ナフタレン骨格を有するエポキシ化合物(a1)の含有量は、エポキシ樹脂(A)全体の30〜80重量%であることが好ましい。特に好ましくは35〜70重量%である。すなわち、ナフタレン骨格を有するエポキシ化合物(a1)の含有量が30重量%未満では、吸湿後の接着力の低下がみられ、80重量%を超えると、粘度が高くなり作業性が低下する傾向がみられるからである。
【0018】
上記光重合開始剤(B)としては、特に限定するものではなく、芳香族ジアゾニウム塩、芳香族スルホニウム塩、芳香族ヨードニウム塩、芳香族スルホキソニウム塩、メタロセン化合物あるいは鉄アレーン系化合物等を用いることができる。その中でも、光硬化性の観点から、芳香族スルホニウム塩が好ましく、特に芳香族スルホニウム・ヘキサフロロホスホニウム化合物、芳香族スルホニウム・ヘキサフロロアンチモネート化合物、またはその両者の併用が、硬化性、接着性、アウトガスの観点から好ましい。さらに、上記光重合開始剤(B)とともに、光増感剤や酸増殖剤等も必要に応じて添加することができる。
【0019】
上記光重合開始剤(B)の含有量は、上記エポキシ樹脂(A)100重量部(以下「部」と略す)に対して1〜15部に設定することが好ましく、特に好ましくは4〜10部である。
【0020】
さらに、本発明においては、接着性を高めるためにシラン系あるいはチタン系のカップリング剤(例えば、γ−グリシドキシプロピルトリメトキシシラン等)、合成ゴムやシリコーン化合物等の可撓性付与剤等の化合物、そして酸化防止剤、消泡剤等の他の添加剤を必要に応じて適宜に配合することができる。
【0021】
本発明の紫外線硬化型接着剤は、例えば、前記ナフタレン骨格を有するエポキシ化合物(a1)およびレゾルシン型エポキシ化合物(a2)を含有するエポキシ樹脂(A)および光重合開始剤(B)、さらに必要に応じて他の添加剤を所定の割合で配合し混合することにより作製することができる。
【0022】
このようにして得られた紫外線硬化型接着剤は、例えば、UVランプ等により紫外線を照射した後、所定の温度でのポストキュアを行うことにより硬化させることができる。
【0023】
つぎに、実施例について比較例と併せて説明する。
【0024】
まず、下記に示す各成分を準備した。
【0025】
〔エポキシ化合物1〕
前記化学式(4)で表されるナフタレン骨格を有するエポキシ化合物
【0026】
〔エポキシ化合物2〕
前記化学式(1)で表されるレゾルシン型エポキシ化合物
【0027】
〔エポキシ化合物3〕
前記一般式(2)で表される脂環式エポキシ化合物〔式(2)中、b=0〕
【0028】
〔エポキシ化合物4〕
前記一般式(3)で表されるエポキシ化合物〔式(3)中、Rはメチル基で、m=0〕
【0029】
〔エポキシ化合物5〕
ビスフェノールA型エポキシ化合物(JER社製、エピコート825)
【0030】
〔光重合開始剤〕
スルホニウム・ヘキサフロロアンチモン系重合開始剤(旭電化社製、SP−170)
【0031】
〔酸化防止剤〕
HCA(三光化学社製)
【0032】
〔消泡剤〕
KS−68(信越シリコーン社製)
【0033】
〔カップリング剤〕
γ−グリシドキシプロピルトリメトキシシラン
【0034】
【実施例1〜7、比較例1〜5】
下記の表1〜表2に示す各成分を、同表に示す割合で配合し混合することにより紫外線硬化型接着剤を作製した。
【0035】
【表1】
Figure 2004010674
【0036】
【表2】
Figure 2004010674
【0037】
このようにして得られた実施例および比較例の各接着剤を用いて、硬化後の初期接着強度、耐湿接着強度、屈折率、透過率、吸水率を下記の方法に従って測定・評価した。また、各エポキシ樹脂成分のみの粘度を下記に示す方法に従って測定した。これらの結果を後記の表3〜表4に併せて示す。
【0038】
〔初期接着強度・耐湿接着強度〕
まず、柱状の石英ガラス板(縦3.3mm×横3.3mm×厚み5mm)に接着剤を塗布した後、石英ガラス板(縦20mm×横35mm×厚み2mm)と貼り合わせ、つぎの硬化条件で接着剤を硬化させることにより接着片を作製した。すなわち、硬化は、500WのUVランプ(高圧水銀ランプ)を用いて60秒間光照射した後、100℃で1時間のポストキュアを行うことにより硬化させた。
【0039】
そして、初期接着強度は、上記接着片を用い、25℃にてプッシュプルゲージを用いて、剪断の接着強度を測定した。
【0040】
また、耐湿接着強度は、上記接着片を、PCT条件下(121℃×202.6kPa)に24時間放置して吸湿させた後、25℃にてプッシュプルゲージを用いて、剪断の接着強度を測定した。
【0041】
〔屈折率〕
屈折率をアッベ屈折率計を用いて測定した。
【0042】
〔透過率〕
厚み100μmのフィルムを作製し(硬化条件は上記と同様)、分光光度計(UV−3101PC、島津製作所社製)を用いて、波長1300nmの光の透過率を25℃で測定した。
【0043】
〔吸水率〕
上記透過率の測定で作製したフィルムを室温で水中に24時間浸漬した後、その重量を測定してフィルムの重量変化から吸水率を求めた。
【0044】
〔エポキシ樹脂成分の粘度〕
E型粘度計を用いて25℃で測定した。
【0045】
【表3】
Figure 2004010674
【0046】
【表4】
Figure 2004010674
【0047】
上記表3〜表4の結果、実施例品は、透過率が高く、初期接着強度および耐湿接着強度とも高い数値が得られた。しかも吸水率は低かった。したがって、高温高湿下での優れた接着性を備え、透明性に優れていることがわかる。
【0048】
これに対して、比較例品は、いずれも吸水率が高く耐湿接着強度の低いものであった。
【0049】
【発明の効果】
以上のように、本発明は、ナフタレン骨格を有するエポキシ化合物(a1)およびレゾルシン型エポキシ化合物(a2)を含有するエポキシ樹脂(A)を用いた紫外線硬化型接着剤である。このため、適度な透明性を有し、かつ吸水率が低く初期および吸湿後の耐湿接着力が高く優れた実用性を備えている。したがって、光通信系における光導波路やVグルーヴ等の精密光部品の接着やファイバーアレイの接着等に適用すると、長期信頼性に優れた接着結合部を実現することが可能となる。
【0050】
そして、上記(A)であるエポキシ樹脂中に、さらに前記一般式(2)で表される脂環式エポキシ化合物を含有すると、所望の特性を低下させることなく適度な粘度に調整することができ、作業性の向上が図られる。
【0051】
また、上記(A)であるエポキシ樹脂中に、さらに前記一般式(3)で表されるエポキシ化合物を含有すると、上記脂環式エポキシ化合物と同様、所望の特性を低下させることなく適度な粘度に調整することができ、作業性の向上が図られる。
【0052】
そして、上記ナフタレン骨格を有するエポキシ化合物(a1)の含有率が、上記(A)成分であるエポキシ樹脂中、30〜80重量%の範囲であると、吸湿後の接着力の低下が抑制されるとともに作業性の向上が図られる。[0001]
TECHNICAL FIELD OF THE INVENTION
INDUSTRIAL APPLICABILITY The present invention has appropriate transparency required for alignment and the like and excellent adhesive strength, has low outgassing (gas that volatilizes under high temperature conditions), has low moisture absorption, and is used for an optical fiber connector. The present invention relates to an adhesive suitable for bonding silica-based glasses, fixing a fiber array, and bonding an optical element such as an optical waveguide (Alley Wave Guide: AWG), a V-groove, or an optical component to a substrate. . That is, the present invention relates to an ultraviolet curable adhesive for fixing an optical element or an optical component, which has adhesiveness that does not deteriorate even under severe temperature and humidity.
[0002]
[Prior art]
In recent years, in the assembly of precise optical fiber connector parts, a method using an adhesive has been used. At the time of this assembly, fixing accuracy on the order of microns is required, so the adhesive is cured in a short time, has excellent adhesion to quartz glass and optical fibers, and has a high temperature and high humidity environment from the viewpoint of long-term reliability. It has been desired to retain excellent adhesion even when placed underneath. In addition, since alignment marks for positioning and transparent ones are used from the viewpoint of fiber visibility, and optical components dislike thermal stress, photocurable adhesives such as ultraviolet curing are often used.
[0003]
[Problems to be solved by the invention]
Conventional cationic polymerization type photo-curing adhesives using epoxy resins have relatively good adhesion, but have high water absorption in adhesion to quartz glass and optical fibers, especially when used under high temperature and high humidity. As a result, the adhesive strength was greatly reduced, and was not satisfactory. On the other hand, radical polymerization type photo-curing adhesives using acrylic resins generally have high stability in adhesive strength but large dimensional stability and heat resistance due to large curing shrinkage and low glass transition temperature. Was not satisfactory.
[0004]
The present invention has been made in view of such circumstances, and has a stable adhesive force even under high-temperature and high-humidity conditions, is transparent, has high dimensional stability, and has excellent adhesiveness to optical elements and optical components. It is an object of the present invention to provide a curable adhesive.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the ultraviolet curable adhesive of the present invention has a configuration containing the following (A) and (B).
(A) An epoxy resin containing the following (a1) and (a2).
(A1) An epoxy compound having a naphthalene skeleton.
(A2) A resorcinol-type epoxy compound.
(B) a photopolymerization initiator.
[0006]
That is, the present inventors have studied to obtain a photocurable adhesive having appropriate transparency and low hygroscopicity and excellent in adhesiveness to optical elements and optical components. Then, a series of studies were conducted to improve a decrease in adhesive strength due to a high water absorption under high temperature and high humidity, which was a drawback of a conventional epoxy resin photocurable adhesive. As a result, when the epoxy compound (a1) having a naphthalene skeleton and the resorcinol-type epoxy compound (a2) are used in combination as the epoxy resin component, excellent transparency and low hygroscopicity are obtained, and adhesiveness at high temperature and high humidity is obtained. The present inventors have found that an adhesive excellent in the above can be obtained, and have reached the present invention.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described in detail.
[0008]
The ultraviolet-curable adhesive of the present invention is obtained by using an epoxy resin (A) containing an epoxy compound (a1) having a naphthalene skeleton and a resorcinol-type epoxy compound (a2), and a photopolymerization initiator (B). Can be
[0009]
The epoxy compound (a1) having a naphthalene skeleton is not particularly limited as long as it has a naphthalene skeleton, but it is preferable to use a liquid at room temperature from the viewpoint of workability. Preferably, the viscosity at 25 ° C. is 200 Pa · s or less, more preferably 50 Pa · s or less. Specifically, it is preferable to use, as the epoxy compound having a naphthalene skeleton, a compound represented by the following chemical formula (4).
[0010]
Embedded image
Figure 2004010674
[0011]
The resorcinol-type epoxy compound (a2) used together with the epoxy compound (a1) having a naphthalene skeleton is not particularly limited, but a liquid at room temperature is preferable from the viewpoint of workability. The viscosity at 25 ° C. is preferably 100 Pa · s or less, more preferably 10 Pa · s or less. And specifically, it is preferable to use a compound represented by the following chemical formula (1) as the resorcinol-type epoxy compound (a2).
[0012]
Embedded image
Figure 2004010674
[0013]
In the present invention, the epoxy resin (A) may be composed of only the epoxy compound (a1) having a naphthalene skeleton and the resorcinol-type epoxy compound (a2), but for the purpose of adjusting viscosity, the naphthalene skeleton may be used. An epoxy compound other than the epoxy compound (a1) having the formula (1) and the resorcinol-type epoxy compound (a2) can be used in combination. Specifically, general-purpose bisphenol type epoxy compounds, hydrogenated bisphenol type epoxy compounds, novolak type epoxy compounds, glycidyl ether type epoxy compounds, glycidyl ester type epoxy compounds, alicyclic epoxy compounds, and the like can be used. Among them, an alicyclic epoxy compound represented by the following general formula (2) and a hydrogenated bisphenol type epoxy compound represented by the following general formula (3) are preferable since they do not deteriorate the properties.
[0014]
Embedded image
Figure 2004010674
[0015]
Embedded image
Figure 2004010674
[0016]
And as for the epoxy resin (A) containing the epoxy compound (a1) having the naphthalene skeleton and the resorcinol-type epoxy compound (a2), the viscosity of the entire epoxy resin component is adjusted to a range of 0.1 to 10 Pa · s. Is preferred. That is, when the viscosity is low such as less than 0.1 Pa · s, the adhesive easily flows out of the joint, and when the viscosity exceeds 10 Pa · s and the viscosity is high, the adhesive is not easily filled in the gap between the joints. This is because there is a tendency to occur.
[0017]
Further, the content of the epoxy compound (a1) having a naphthalene skeleton in the epoxy resin (A) is preferably 30 to 80% by weight of the entire epoxy resin (A). Particularly preferably, it is 35 to 70% by weight. That is, when the content of the epoxy compound (a1) having a naphthalene skeleton is less than 30% by weight, the adhesive strength after moisture absorption is reduced, and when it exceeds 80% by weight, the viscosity tends to increase and the workability tends to decrease. Because it can be seen.
[0018]
The photopolymerization initiator (B) is not particularly limited, and an aromatic diazonium salt, an aromatic sulfonium salt, an aromatic iodonium salt, an aromatic sulfoxonium salt, a metallocene compound, an iron arene compound, or the like is used. be able to. Among them, from the viewpoint of photocurability, an aromatic sulfonium salt is preferable, and in particular, an aromatic sulfonium hexafluorophosphonium compound, an aromatic sulfonium hexafluoroantimonate compound, or a combination of both thereof is curable, adhesive, It is preferable from the viewpoint of outgassing. Further, together with the photopolymerization initiator (B), a photosensitizer, an acid multiplying agent and the like can be added as required.
[0019]
The content of the photopolymerization initiator (B) is preferably set to 1 to 15 parts, more preferably 4 to 10 parts, per 100 parts by weight (hereinafter abbreviated as “parts”) of the epoxy resin (A). Department.
[0020]
Further, in the present invention, a silane-based or titanium-based coupling agent (for example, γ-glycidoxypropyltrimethoxysilane or the like) for enhancing the adhesiveness, a flexibility imparting agent such as a synthetic rubber or a silicone compound, or the like. And other additives such as an antioxidant and an antifoaming agent can be appropriately compounded as required.
[0021]
The ultraviolet-curable adhesive of the present invention includes, for example, an epoxy resin (A) containing the epoxy compound (a1) having a naphthalene skeleton and a resorcinol-type epoxy compound (a2), a photopolymerization initiator (B), and further, It can be produced by mixing and mixing other additives in a predetermined ratio accordingly.
[0022]
The ultraviolet curable adhesive thus obtained can be cured by, for example, irradiating ultraviolet rays with a UV lamp or the like, and then performing post-curing at a predetermined temperature.
[0023]
Next, examples will be described together with comparative examples.
[0024]
First, the following components were prepared.
[0025]
[Epoxy compound 1]
An epoxy compound having a naphthalene skeleton represented by the chemical formula (4)
[Epoxy compound 2]
Resorcinol-type epoxy compound represented by the chemical formula (1)
[Epoxy compound 3]
The alicyclic epoxy compound represented by the general formula (2) [in the formula (2), b = 0]
[0028]
[Epoxy compound 4]
An epoxy compound represented by the general formula (3) [wherein R is a methyl group and m = 0]
[0029]
[Epoxy compound 5]
Bisphenol A type epoxy compound (Epicoat 825, manufactured by JER)
[0030]
(Photopolymerization initiator)
Sulfonium / hexafluoroantimony polymerization initiator (SP-170, manufactured by Asahi Denka Co., Ltd.)
[0031]
〔Antioxidant〕
HCA (manufactured by Sanko Chemical)
[0032]
(Antifoaming agent)
KS-68 (made by Shin-Etsu Silicone)
[0033]
(Coupling agent)
γ-glycidoxypropyltrimethoxysilane
Examples 1 to 7, Comparative Examples 1 to 5
The components shown in Tables 1 and 2 below were blended and mixed at the ratios shown in the same table to produce an ultraviolet-curable adhesive.
[0035]
[Table 1]
Figure 2004010674
[0036]
[Table 2]
Figure 2004010674
[0037]
Using the adhesives of Examples and Comparative Examples thus obtained, the initial adhesive strength after curing, the moisture-resistant adhesive strength, the refractive index, the transmittance, and the water absorption were measured and evaluated according to the following methods. The viscosity of each epoxy resin component alone was measured according to the method described below. The results are shown in Tables 3 and 4 below.
[0038]
[Initial adhesive strength / moisture resistant adhesive strength]
First, an adhesive is applied to a columnar quartz glass plate (length 3.3 mm × width 3.3 mm × thickness 5 mm), and then adhered to a quartz glass plate (length 20 mm × width 35 mm × thickness 2 mm). The adhesive was hardened to prepare an adhesive piece. That is, curing was performed by irradiating light with a 500 W UV lamp (high pressure mercury lamp) for 60 seconds, and then performing post-curing at 100 ° C. for 1 hour.
[0039]
And the initial adhesive strength measured the adhesive strength of shearing using the said adhesive piece and the push-pull gauge at 25 degreeC.
[0040]
Further, the moisture-resistant adhesive strength was determined by measuring the shear strength of the above-mentioned adhesive piece by using a push-pull gauge at 25 ° C. after leaving the adhesive piece under PCT conditions (121 ° C. × 202.6 kPa) for 24 hours to absorb moisture. It was measured.
[0041]
(Refractive index)
The refractive index was measured using an Abbe refractometer.
[0042]
(Transmissivity)
A film having a thickness of 100 μm was prepared (the curing conditions were the same as above), and the transmittance of light having a wavelength of 1300 nm was measured at 25 ° C. using a spectrophotometer (UV-3101PC, manufactured by Shimadzu Corporation).
[0043]
(Water absorption)
After immersing the film produced in the above-described measurement of transmittance in water at room temperature for 24 hours, the weight was measured and the water absorption was determined from the change in weight of the film.
[0044]
(Viscosity of epoxy resin component)
It measured at 25 degreeC using the E-type viscometer.
[0045]
[Table 3]
Figure 2004010674
[0046]
[Table 4]
Figure 2004010674
[0047]
As a result of the above Tables 3 and 4, the Example product had a high transmittance, and a high numerical value was obtained for both the initial adhesive strength and the moisture resistant adhesive strength. Moreover, the water absorption was low. Accordingly, it can be seen that the film has excellent adhesiveness under high temperature and high humidity and is excellent in transparency.
[0048]
In contrast, all of the comparative examples had high water absorption and low moisture-resistant adhesive strength.
[0049]
【The invention's effect】
As described above, the present invention is an ultraviolet curable adhesive using an epoxy resin (A) containing an epoxy compound (a1) having a naphthalene skeleton and a resorcinol-type epoxy compound (a2). For this reason, it has moderate transparency, low water absorption, high initial and moisture absorption adhesive strength after moisture absorption, and excellent practicality. Therefore, when the present invention is applied to the bonding of precision optical components such as an optical waveguide and a V-groove and the bonding of a fiber array in an optical communication system, it is possible to realize a bonded portion having excellent long-term reliability.
[0050]
When the epoxy resin (A) further contains the alicyclic epoxy compound represented by the general formula (2), the viscosity can be adjusted to an appropriate level without lowering desired properties. Thus, workability is improved.
[0051]
Further, when the epoxy resin represented by the above (A) further contains an epoxy compound represented by the general formula (3), similar to the alicyclic epoxy compound, a suitable viscosity can be obtained without lowering desired properties. And the workability can be improved.
[0052]
When the content of the epoxy compound (a1) having a naphthalene skeleton is in the range of 30 to 80% by weight in the epoxy resin as the component (A), a decrease in adhesion after moisture absorption is suppressed. At the same time, the workability is improved.

Claims (5)

下記の(A)および(B)を含有することを特徴とする紫外線硬化型接着剤。
(A)下記の(a1)および(a2)を含有するエポキシ樹脂。
(a1)ナフタレン骨格を有するエポキシ化合物。
(a2)レゾルシン型エポキシ化合物。
(B)光重合開始剤。
An ultraviolet curable adhesive comprising the following (A) and (B):
(A) An epoxy resin containing the following (a1) and (a2).
(A1) An epoxy compound having a naphthalene skeleton.
(A2) A resorcinol-type epoxy compound.
(B) a photopolymerization initiator.
上記(a2)であるレゾルシン型エポキシ化合物が、下記の化学式(1)で表されるものである請求項1記載の紫外線硬化型接着剤。
Figure 2004010674
The ultraviolet-curable adhesive according to claim 1, wherein the resorcinol-type epoxy compound (a2) is represented by the following chemical formula (1).
Figure 2004010674
上記(A)であるエポキシ樹脂中に、さらに下記の一般式(2)で表される脂環式エポキシ化合物を含有する請求項1または2記載の紫外線硬化型接着剤。
Figure 2004010674
The ultraviolet curable adhesive according to claim 1 or 2, wherein the epoxy resin (A) further contains an alicyclic epoxy compound represented by the following general formula (2).
Figure 2004010674
上記(A)であるエポキシ樹脂中に、さらに下記の一般式(3)で表されるエポキシ化合物を含有する請求項1〜3のいずれか一項に記載の紫外線硬化型接着剤。
Figure 2004010674
The ultraviolet-curable adhesive according to any one of claims 1 to 3, wherein the epoxy resin (A) further contains an epoxy compound represented by the following general formula (3).
Figure 2004010674
上記(A)成分中のナフタレン骨格を有するエポキシ化合物(a1)の含有率が、上記(A)成分であるエポキシ樹脂中、30〜80重量%である請求項1〜4のいずれか一項に記載の紫外線硬化型接着剤。The content of the epoxy compound (a1) having a naphthalene skeleton in the component (A) is 30 to 80% by weight in the epoxy resin as the component (A). The ultraviolet-curable adhesive according to the above.
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