JP2004352771A - Ultraviolet-curable epoxy resin composition - Google Patents

Ultraviolet-curable epoxy resin composition Download PDF

Info

Publication number
JP2004352771A
JP2004352771A JP2003149334A JP2003149334A JP2004352771A JP 2004352771 A JP2004352771 A JP 2004352771A JP 2003149334 A JP2003149334 A JP 2003149334A JP 2003149334 A JP2003149334 A JP 2003149334A JP 2004352771 A JP2004352771 A JP 2004352771A
Authority
JP
Japan
Prior art keywords
epoxy resin
ultraviolet
resin composition
silicone oil
curable epoxy
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
Application number
JP2003149334A
Other languages
Japanese (ja)
Inventor
Takashi Fukushima
喬 福島
Hideyuki Usui
英之 薄井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nitto Denko Corp
Original Assignee
Nitto Denko Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nitto Denko Corp filed Critical Nitto Denko Corp
Priority to JP2003149334A priority Critical patent/JP2004352771A/en
Publication of JP2004352771A publication Critical patent/JP2004352771A/en
Pending legal-status Critical Current

Links

Landscapes

  • Epoxy Resins (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultraviolet-curable epoxy resin composition for fixing optical elements and optical parts which maintains high transparency and, e.g. has a very small rate of occurrence of peeling of an adhesive layer from quartz glass after curing, after reflowing or under long-term, high temperature and humidity conditions, i.e. has excellent adhesiveness even under severe temperature and humidity conditions. <P>SOLUTION: The ultraviolet-curable epoxy resin composition comprises (A) an alicyclic epoxy resin, (B) a silicone oil represented by formula (1), and (C) a photopolymerization initiator. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、光通信分野にて使用される光学部品や光学部品組み立て用に用いられる透明樹脂において、光信号を低損失で通す透明性と優れた接着力を有し、高温高湿後の剥離の発生率が著しく低い紫外線硬化型の透明液状エポキシ樹脂組成物に関するものである。特に、レンズの固定、光デバイスパッケージのシールやV溝基板への光ファイバーの固定、光導波路やレンズ等の光学部品等に有用な接着剤となる紫外線硬化型エポキシ樹脂組成物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、短時間硬化とともに、例えば、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していることが要望されていた。そして、位置決めのためのアライメントマークや光ファイバーの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。一方、従来、光導波路は石英等のガラスが主流であったが、近年高分子導波路の開発が進み、アクリレート、エポキシ樹脂、ポリイミドやポリシラン等の様々な材料を用いた研究が進められている。
【0003】
このような状況の中、例えば、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、非常に硬化物が脆いという点から少しの衝撃で石英ガラスと接着剤層に剥離が発生し、それに起因して接着力が低下するという問題がある。
【0004】
さらに、エポキシ系樹脂やアクリレート等では、一般に硬化物の特性における弾性率が高く、そのために少しの衝撃にて剥離が発生する。この傾向は、紫外線照射直後より、さらにアフターキュア後の方が顕著であり、さらに光部品、光デバイスが実装される高温下および長期信頼性である高温高湿度テスト後にはさらに顕著に剥離が発生し、接着力を低下させる原因となり問題とされている。
【0005】
上記問題を解決する方法として、弾性率を下げるために、一般にシリコーン変性することが知られており、紫外線硬化型エポキシ樹脂においても、シリコーン化合物をブレンドしたものが提案されている。例えば、特定の粘度範囲のエポキシ官能性シリコーンポリマーと、ビニルエーテルモノマーまたはオリゴマー、さらに光触媒を用いた紫外線硬化性エポキシシリコーンブレンド組成物が提案されている(特許文献1参照)。
【0006】
【特許文献1】
特開平9−12650号公報
【0007】
【発明が解決しようとする課題】
しかしながら、上記シリコーン化合物がブレンドされた紫外線硬化性の樹脂組成物においても、各種光学用接着剤としては、高温,高湿度下における接着性等に関して充分な特性が得られず、未だ満足のいくものが得られていないのが実情である。
【0008】
本発明は、このような事情に鑑みなされたもので、高い透明性を維持し、かつ硬化後やリフロー後、あるいは長期間での高温高湿条件下においても、例えば、石英ガラスとの接着層の剥離発生率が非常に小さい、すなわち、過酷な温湿度条件下でも優れた接着性を有する光学素子および光部品固定用接着剤等に用いられる紫外線硬化型エポキシ樹脂組成物の提供をその目的とする。
【0009】
【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エポキシ樹脂組成物は、下記の(A)〜(C)を含有するという構成をとる。
(A)脂環式エポキシ樹脂。
(B)下記の一般式(1)で表されるシリコーンオイル。
【化2】

Figure 2004352771
(C)光重合開始剤。
【0010】
すなわち、本発明者らは、高温高湿条件下でも優れた接着性を有し、良好な透明性を備えた紫外線硬化型のエポキシ樹脂組成物を得るために鋭意検討を重ねた。その結果、エポキシ樹脂として、脂環式エポキシ樹脂(A)を用いるとともに、上記特定のシリコーンオイル(B)を用いると、この脂環式エポキシ樹脂(A)と特定のシリコーンオイル(B)との相乗作用である、良好な紫外線(UV)硬化性と良好な接着性が得られることにより、上記のような所期の目的が達成されることを見出し本発明に到達した。
【0011】
【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。
【0012】
本発明の紫外線硬化型エポキシ樹脂組成物は、脂環式エポキシ樹脂(A)と、特定のシリコーンオイル(B)と、光重合開始剤(C)とを用いることにより得られる。
【0013】
上記脂環式エポキシ樹脂(A)としては、特に限定するものではないが、反応性が高く透明なものを用いることが好ましく、しかも、粘度は125℃で約0.25Pa・sであることが好ましい。具体的には、下記の式(2)で表される水添ビスフェノールA型エポキシ樹脂、3,4−エポキシシクロヘキシルメチル−3,4−エポキシシクロヘキサンカルボキシレート、3,4−エポキシシクロヘキシルエチル−3,4−エポキシシクロヘキサンカルボキシレート等が、透明性、粘性、反応性の観点から好ましい。これらは単独でもしくは2種以上併せて用いられる。
【0014】
【化3】
Figure 2004352771
【0015】
これら脂環式エポキシ樹脂(A)の中でも、反応性,透明性という観点から、3,4−エポキシシクロヘキシルメチル−3,4−エポキシシクロヘキサンカルボキシレートおよび上記式(2)で表される水添ビスフェノールA型エポキシ樹脂を併用することが好ましい。そして、上記併用に際して、3,4−エポキシシクロヘキシルメチル−3,4−エポキシシクロヘキサンカルボキシレート(x)および上記式(2)で表される水添ビスフェノールA型エポキシ樹脂(y)の混合割合は、重量基準で、x/y=30/70〜70/30の範囲に設定することが好ましい。
【0016】
本発明において、上記脂環式エポキシ樹脂(A)を必須成分とし、これに従来公知のエポキシ樹脂を併用してもよい。具体的には、汎用のビスフェノール型エポキシ樹脂、水添ビスフェノールF型エポキシ樹脂、ノボラック型エポキシ樹脂、グリシジルエーテル型エポキシ樹脂、グリシジルエステル型エポキシ樹脂等を用いることができる。なお、上記従来公知のエポキシ樹脂を用いる場合、その使用量は、エポキシ樹脂成分全体中の70重量%以下に設定することが好ましい。
【0017】
上記脂環式エポキシ樹脂(A)とともに用いられる特定のシリコーンオイル(B)は、下記の一般式(1)で表されるものであり、このような両末端がエポキシ変性された構造を有するシリコーンオイルを用いることにより、接着性が良好となり、碁盤目剥離テストにおいて、剥離発生度を低減することができる。このような構造を有するシリコーンオイルは、例えば、東レ・ダウコーニング社製のBY−16−855Dを用いることができる。
【0018】
【化4】
Figure 2004352771
【0019】
そして、上記式(1)において、Rは−C−で、繰り返し数nは1〜3の範囲が特に好ましい。
【0020】
上記特定のシリコーンオイル(B)の含有量は、上記脂環式エポキシ樹脂(A)と特定のシリコーンオイル(B)の合計量中、10〜50重量%の範囲に設定することが好ましい。より好ましくは20〜40重量%である。すなわち、特定のシリコーンオイル(B)の含有量が10重量%未満では、接着性が低下する傾向がみられ、50重量%を超えると、反応性が低下し、その結果、作業性が著しく低下する傾向がみられるからである。
【0021】
上記脂環式エポキシ樹脂(A)および特定のシリコーンオイル(B)とともに用いられる光重合開始剤(C)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、接着性等の観点から好ましい。さらに、上記光重合開始剤(C)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。
【0022】
上記光重合開始剤(C)の含有量は、上記脂環式エポキシ樹脂(A)を含むエポキシ樹脂成分および特定のシリコーンオイル(B)の合計量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2〜10部である。
【0023】
また、本発明の紫外線硬化型エポキシ樹脂組成物には、上記(A)〜(C)以外に、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、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、さらに酸化防止剤、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。
【0024】
本発明の紫外線硬化型エポキシ樹脂組成物は、例えば、脂環式エポキシ樹脂(A)と、特定のシリコーンオイル(B)と、光重合開始剤(C)さらに必要に応じて他の添加剤を用いて、所定の割合で配合し溶融混合することにより得られる。
【0025】
そして、本発明の紫外線硬化型エポキシ樹脂組成物の粘度は、接着剤としての使用時における作業性等を考慮して、25℃で1〜50Pa・s程度であることが好ましい。
【0026】
このようにして得られる紫外線硬化型エポキシ樹脂組成物は、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。
【0027】
また、本発明の紫外線硬化型エポキシ樹脂組成物の硬化後の光透過率は、通常、厚み100μmの場合、可視光領域(波長500〜900nm)および赤外領域において80%以上、より好ましくは90%以上である。
【0028】
つぎに、実施例について比較例と併せて説明する。
【0029】
まず、下記に示す各成分を準備した。
【0030】
〔エポキシ樹脂1〕
下記の式(a)で表される脂環式エポキシ樹脂(ダイセル化学社製、セロキサイド2021P:3,4−エポキシシクロヘキシルメチル−3,4−エポキシシクロヘキサンカルボキシレート)
【化5】
Figure 2004352771
【0031】
〔エポキシ樹脂2〕
下記の式(b)で表される水添ビスフェノールA型エポキシ樹脂(JER社製、エピコートYX−8000)
【化6】
Figure 2004352771
【0032】
〔エポキシ樹脂3〕
ビスフェノールA型エポキシ樹脂(JER社製、エピコート825)
【0033】
〔シリコーンオイル1〕
前記式(1)で表されるエポキシ変性シリコーンオイル〔式(1)中、Rは−C−、n=1(東レシリコーン社製、BY−16−855D)〕
【0034】
〔シリコーンオイル2〕
下記の式(c)で表されるシリコーンオイル(東芝シリコーン社製、TSL−9906)
【化7】
Figure 2004352771
【0035】
〔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)
【0036】
〔酸化防止剤〕
HCA(三光化学社製)
【0037】
〔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
【0038】
【実施例1〜6、比較例1〜4】
下記の表1〜表2に示す各配合成分を同表に示す割合で配合し溶融混合(条件:25℃)することにより紫外線硬化型エポキシ樹脂組成物を作製した。
【0039】
【表1】
Figure 2004352771
【0040】
【表2】
Figure 2004352771
【0041】
このようにして得られた実施例および比較例の各紫外線硬化型エポキシ樹脂組成物を用いて、25℃でのエポキシ樹脂組成物の粘度、光透過率、硬化後の初期接着強度・耐湿接着強度、接着性を下記の方法に従ってそれぞれ測定・評価した。これらの結果を後記の表3〜表4に併せて示す。
【0042】
〔エポキシ樹脂組成物の粘度〕
E型粘度計を用いて25℃での粘度を測定した。
【0043】
〔光透過率〕
500WのUVランプ(高圧水銀ランプ)を用いて720mJ/cmにて光照射した後、100℃で1時間のポストキュアを行うことにより、厚み100μmのフィルムを作製した。そして、このフィルムを用い、分光光度計(UV−3101PC、島津製作所社製)を用いて、波長1300nmの光透過率を25℃で測定した。
【0044】
〔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、紫外線硬化型エポキシ樹脂組成物を接着剤として塗布した後、石英ガラス板(縦20mm×横35mm×厚み2mm)に圧着して貼り合わせ、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、上記硬化は、上記と同様、500WのUVランプ(高圧水銀ランプ)を用いて720mJ/cmにて光照射した後、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。
【0045】
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。
【0046】
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。
【0047】
〔接着性〕
40mm×20mm×厚み2mmの石英ガラス板を準備し、上記石英ガラス板表面に、一定の厚み(140μm)に紫外線硬化型エポキシ樹脂組成物を塗布した後、紫外線照射して硬化させた。ついで、得られた試料をPCT条件下(121℃×202.6kPa)に24時間放置して吸湿させ、リフロー(条件:240℃×10秒×3回、さらに260℃×10秒×3回)後、上記硬化層の上から碁盤の目にカッターにて刃を入れ石英ガラス板と硬化層の剥離度合いを測定・評価した(碁盤のマス目=9個)。なお、上記紫外線照射による硬化条件は、上記初期接着強度における試料の作製と同様に設定した。
【0048】
【表3】
Figure 2004352771
【0049】
【表4】
Figure 2004352771
【0050】
上記結果から、実施例品は、可視光領域である1300nmにおいて光透過率が全て90%を超えて高く透明性に優れていることがわかる。また、初期接着強度はもちろん耐湿接着強度においても高い数値が得られ、接着性に関する碁盤目剥離テストにおいても全く剥離がみられなかったか、あるいは剥離発生度が非常に低く、接着性に優れていることがわかる。
【0051】
これに対して、特定のシリコーンオイルを用いない比較例1,2品では、耐湿接着強度が低く、しかも接着性に関する碁盤目剥離テストにおいて剥離発生度が高く接着性に劣るものであった。特に、脂環式エポキシ樹脂の割合が高い比較例2品では、剥離発生度が著しく高く、しかも耐湿接着強度が極端に低下した。また、通常のエポキシ樹脂と特定のシリコーンオイルを用いた比較例3品、および脂環式エポキシ樹脂と通常のシリコーンオイルを用いた比較例4品も、耐湿接着強度が低く、碁盤目剥離テストにおいて剥離発生度が高く接着性に劣るものであった。
【0052】
【発明の効果】
以上のように、本発明は、脂環式エポキシ樹脂(A)とともに前記特定のシリコーンオイル(B)を用いた紫外線硬化型エポキシ樹脂組成物である。このため、高い透明性を有し、かつ初期および吸湿後の耐湿接着強度も高く、接着対象物に対して剥離の発生が抑制され優れた接着性を備えている。したがって、本発明の紫外線硬化型エポキシ樹脂組成物を、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およびファイバーアレイの接着用途、またレンズ等の小型部品の固定用等、例えば、石英ガラスとの接着用途に適用すると、長期信頼性に優れた接着結合部を実現することができる。
【0053】
そして、上記一般式(1)で表されるシリコーンオイル(B)の含有量を、上記脂環式エポキシ樹脂(A)と一般式(1)で表されるシリコーンオイル(B)の合計量中、10〜50重量%の範囲に設定すると、一層優れた接着性が得られるとともに作業性に関してもより良好なものが得られるようになる。
【0054】
さらに、上記脂環式エポキシ樹脂(A)として、3,4−エポキシシクロヘキシルメチル−3,4−エポキシシクロヘキサンカルボキシレートおよび水添ビスフェノールA型エポキシ樹脂を用いると、優れた接着性と作業性が得られる。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an optical component used in the field of optical communication and a transparent resin used for assembling the optical component, which has a transparency that transmits an optical signal with low loss and an excellent adhesive force, and peels after high temperature and high humidity. The present invention relates to an ultraviolet-curable transparent liquid epoxy resin composition having a remarkably low occurrence rate. In particular, the present invention relates to an ultraviolet curable epoxy resin composition which is useful as an adhesive useful for fixing a lens, sealing an optical device package, fixing an optical fiber to a V-groove substrate, and optical components such as an optical waveguide and a lens.
[0002]
[Prior art]
In recent years, in the assembly of precision optical fiber connector parts, a method using an adhesive has been used. At the time of this assembling, together with curing for a short time, for example, excellent adhesiveness to quartz glass and optical fiber, and excellent adhesiveness even when placed in a high-temperature and high-humidity environment from the viewpoint of long-term reliability are maintained. It was requested. In addition, transparent materials are used because of the visibility of alignment marks and optical fibers for positioning. In addition, since optical components dislike thermal stress, photocurable adhesives such as ultraviolet curing are often used. On the other hand, glass such as quartz has been the mainstream for optical waveguides in the past, but in recent years the development of polymer waveguides has progressed, and studies using various materials such as acrylates, epoxy resins, polyimides and polysilanes have been advanced. .
[0003]
Under such circumstances, for example, a cationically polymerizable photocuring adhesive using a conventional epoxy resin has relatively excellent adhesiveness, but in the adhesiveness to quartz glass and optical fibers, a very hardened product is obtained. Because of its brittleness, there is a problem that the quartz glass and the adhesive layer are peeled off by a small impact, and the adhesive strength is reduced due to the peeling.
[0004]
Further, epoxy resins, acrylates, and the like generally have a high elastic modulus in the properties of the cured product, and thus peeling occurs with a slight impact. This tendency is more remarkable after the after-cure than immediately after the UV irradiation, and furthermore, the peeling occurs more remarkably under the high-temperature and high-humidity test where the optical components and devices are mounted and the long-term reliability. However, this is a cause of lowering the adhesive strength, and is considered to be a problem.
[0005]
As a method for solving the above problem, it is generally known that silicone is modified in order to reduce the elastic modulus, and a UV-curable epoxy resin blended with a silicone compound has been proposed. For example, an ultraviolet-curable epoxy silicone blend composition using an epoxy-functional silicone polymer having a specific viscosity range, a vinyl ether monomer or oligomer, and a photocatalyst has been proposed (see Patent Document 1).
[0006]
[Patent Document 1]
JP-A-9-12650
[Problems to be solved by the invention]
However, even in the ultraviolet curable resin composition blended with the above silicone compound, sufficient adhesive properties at high temperature and high humidity cannot be obtained as various optical adhesives, and these are still satisfactory. The fact is that they have not been obtained.
[0008]
The present invention has been made in view of such circumstances, and maintains high transparency, and after curing or reflow, or even under high-temperature and high-humidity conditions for a long time, for example, an adhesive layer with quartz glass The purpose of the present invention is to provide an ultraviolet-curable epoxy resin composition used for an optical element and an adhesive for fixing an optical component having excellent adhesion even under severe temperature and humidity conditions. I do.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the ultraviolet-curable epoxy resin composition of the present invention has a configuration containing the following (A) to (C).
(A) Alicyclic epoxy resin.
(B) A silicone oil represented by the following general formula (1).
Embedded image
Figure 2004352771
(C) a photopolymerization initiator.
[0010]
That is, the present inventors have intensively studied to obtain an ultraviolet-curable epoxy resin composition having excellent adhesiveness even under high temperature and high humidity conditions and having good transparency. As a result, when the alicyclic epoxy resin (A) is used as the epoxy resin and the specific silicone oil (B) is used, the alicyclic epoxy resin (A) and the specific silicone oil (B) are mixed. The present inventors have found that the desired object as described above is achieved by obtaining good ultraviolet (UV) curability and good adhesiveness, which are synergistic effects, and reached the present invention.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described in detail.
[0012]
The ultraviolet-curable epoxy resin composition of the present invention is obtained by using an alicyclic epoxy resin (A), a specific silicone oil (B), and a photopolymerization initiator (C).
[0013]
The alicyclic epoxy resin (A) is not particularly limited, but it is preferable to use a highly reactive and transparent resin, and the viscosity is preferably about 0.25 Pa · s at 125 ° C. preferable. Specifically, hydrogenated bisphenol A type epoxy resin represented by the following formula (2), 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate, 3,4-epoxycyclohexylethyl-3, 4-epoxycyclohexanecarboxylate and the like are preferable from the viewpoint of transparency, viscosity, and reactivity. These may be used alone or in combination of two or more.
[0014]
Embedded image
Figure 2004352771
[0015]
Among these alicyclic epoxy resins (A), from the viewpoint of reactivity and transparency, 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate and hydrogenated bisphenol represented by the above formula (2) It is preferable to use an A-type epoxy resin in combination. Then, in the above combination, the mixing ratio of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate (x) and the hydrogenated bisphenol A type epoxy resin (y) represented by the above formula (2) is as follows: It is preferable to set x / y = 30/70 to 70/30 on a weight basis.
[0016]
In the present invention, the alicyclic epoxy resin (A) may be used as an essential component, and a conventionally known epoxy resin may be used in combination. Specifically, general-purpose bisphenol type epoxy resin, hydrogenated bisphenol F type epoxy resin, novolak type epoxy resin, glycidyl ether type epoxy resin, glycidyl ester type epoxy resin and the like can be used. When the above-mentioned conventionally known epoxy resin is used, its amount is preferably set to 70% by weight or less based on the whole epoxy resin component.
[0017]
The specific silicone oil (B) used together with the alicyclic epoxy resin (A) is represented by the following general formula (1), and is a silicone having a structure in which both ends are epoxy-modified. By using an oil, the adhesiveness is improved, and the degree of peeling can be reduced in a grid-cut peeling test. As a silicone oil having such a structure, for example, BY-16-855D manufactured by Dow Corning Toray Co., Ltd. can be used.
[0018]
Embedded image
Figure 2004352771
[0019]
In the above formula (1), R is preferably —C 3 H 6 —, and the number of repetitions n is particularly preferably in the range of 1 to 3.
[0020]
The content of the specific silicone oil (B) is preferably set in the range of 10 to 50% by weight based on the total amount of the alicyclic epoxy resin (A) and the specific silicone oil (B). More preferably, it is 20 to 40% by weight. That is, when the content of the specific silicone oil (B) is less than 10% by weight, the adhesiveness tends to decrease, and when the content exceeds 50% by weight, the reactivity decreases, and as a result, the workability decreases remarkably. This is because there is a tendency to do so.
[0021]
The photopolymerization initiator (C) used with the alicyclic epoxy resin (A) and the specific silicone oil (B) is not particularly limited, and may be an aromatic diazonium salt, an aromatic sulfonium salt, an aromatic iodonium. Salts, aromatic sulfoxonium salts, metallocene compounds, iron arene compounds and the like can be used. Among them, from the viewpoint of photocurability, aromatic sulfonium salts are preferable, and in particular, aromatic sulfonium hexafluorophosphonium compounds, aromatic sulfonium hexafluoroantimonate compounds, or a combination of both thereof is curable, adhesive, etc. It is preferable from the viewpoint of. Further, together with the photopolymerization initiator (C), a photosensitizer, an acid multiplying agent and the like can be added as required.
[0022]
The content of the photopolymerization initiator (C) is 100 parts by weight (hereinafter abbreviated as “parts”) of the total amount of the epoxy resin component including the alicyclic epoxy resin (A) and the specific silicone oil (B). The amount is preferably set to 1 to 15 parts, and particularly preferably 2 to 10 parts.
[0023]
In addition to the above (A) to (C), the ultraviolet-curable epoxy resin composition of the present invention may contain a silane-based or titanium-based coupling agent, a synthetic rubber, a silicone compound, or the like in order to enhance adhesiveness. Compounds such as a flexibility-imparting agent and other additives such as an antioxidant and an antifoaming agent can be appropriately compounded as required.
[0024]
The ultraviolet-curable epoxy resin composition of the present invention comprises, for example, an alicyclic epoxy resin (A), a specific silicone oil (B), a photopolymerization initiator (C), and if necessary, other additives. It is obtained by blending at a predetermined ratio and melt-mixing.
[0025]
The viscosity of the ultraviolet-curable epoxy resin composition of the present invention is preferably about 1 to 50 Pa · s at 25 ° C. in consideration of workability when used as an adhesive.
[0026]
The ultraviolet-curable epoxy resin composition thus obtained can be cured by irradiating ultraviolet rays with a UV lamp or the like and then performing post-curing at a predetermined temperature.
[0027]
In addition, the light transmittance of the ultraviolet-curable epoxy resin composition of the present invention after curing is usually 80% or more, more preferably 90%, in the visible light region (wavelength 500 to 900 nm) and infrared region when the thickness is 100 μm. % Or more.
[0028]
Next, examples will be described together with comparative examples.
[0029]
First, the following components were prepared.
[0030]
[Epoxy resin 1]
Alicyclic epoxy resin represented by the following formula (a) (Celloxide 2021P: 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate, manufactured by Daicel Chemical Industries, Ltd.)
Embedded image
Figure 2004352771
[0031]
[Epoxy resin 2]
Hydrogenated bisphenol A type epoxy resin represented by the following formula (b) (Epicoat YX-8000 manufactured by JER)
Embedded image
Figure 2004352771
[0032]
[Epoxy resin 3]
Bisphenol A epoxy resin (JER, Epicoat 825)
[0033]
[Silicone oil 1]
Epoxy-modified silicone oil represented by the formula (1) [in the formula (1), R is —C 3 H 6 —, n = 1 (BY-16-855D, manufactured by Toray Silicone Co., Ltd.)]
[0034]
[Silicone oil 2]
Silicone oil represented by the following formula (c) (TSL-9906, manufactured by Toshiba Silicone Co., Ltd.)
Embedded image
Figure 2004352771
[0035]
(Photopolymerization initiator)
Sulfonium hexafluoroantimony polymerization initiator (SP-170, manufactured by Asahi Denka Co., Ltd.)
[0036]
〔Antioxidant〕
HCA (manufactured by Sanko Chemical)
[0037]
(Coupling agent)
γ-glycidoxypropyltrimethoxysilane
Examples 1 to 6, Comparative Examples 1 to 4
The UV curable epoxy resin composition was prepared by blending the components shown in Tables 1 and 2 below in the proportions shown in the table and melt-mixing (conditions: 25 ° C.).
[0039]
[Table 1]
Figure 2004352771
[0040]
[Table 2]
Figure 2004352771
[0041]
Using the ultraviolet-curable epoxy resin compositions of Examples and Comparative Examples obtained in this manner, the viscosity, light transmittance, initial adhesive strength after curing, and moisture-resistant adhesive strength of the epoxy resin composition at 25 ° C. And adhesiveness were measured and evaluated according to the following methods. The results are shown in Tables 3 and 4 below.
[0042]
(Viscosity of epoxy resin composition)
The viscosity at 25 ° C. was measured using an E-type viscometer.
[0043]
(Light transmittance)
After irradiation with light at 720 mJ / cm 2 using a 500 W UV lamp (high pressure mercury lamp), a 100 μm thick film was prepared by performing post-curing at 100 ° C. for 1 hour. Then, using this film, the light transmittance at a wavelength of 1300 nm was measured at 25 ° C. using a spectrophotometer (UV-3101PC, manufactured by Shimadzu Corporation).
[0044]
[Initial adhesive strength / moisture resistant adhesive strength]
First, an ultraviolet-curable epoxy resin composition is applied as an adhesive to a columnar quartz glass plate (3.3 mm long × 3.3 mm wide × 5 mm thick), and then the quartz glass plate (20 mm long × 35 mm wide × 2 mm thick) is applied. ) Was bonded by pressure bonding, and the adhesive was cured under the following curing conditions to produce an adhesive piece. That is, similarly to the above, curing was performed by irradiating light at 720 mJ / cm 2 using a 500 W UV lamp (high pressure mercury lamp) and then performing post-curing at 100 ° C. for 1 hour.
[0045]
And the initial adhesive strength measured the adhesive strength of shearing using the said adhesive piece and the push-pull gauge at 25 degreeC.
[0046]
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.
[0047]
〔Adhesiveness〕
A quartz glass plate having a size of 40 mm x 20 mm x a thickness of 2 mm was prepared, and a UV-curable epoxy resin composition was applied on the surface of the quartz glass plate to a predetermined thickness (140 µm), and then cured by irradiating ultraviolet rays. Then, the obtained sample was left under PCT conditions (121 ° C. × 202.6 kPa) for 24 hours to absorb moisture and reflow (conditions: 240 ° C. × 10 seconds × 3 times, further 260 ° C. × 10 seconds × 3 times) Thereafter, a blade was inserted with a cutter from the top of the hardened layer into a grid, and the degree of separation between the quartz glass plate and the hardened layer was measured and evaluated (9 grids in the grid). The curing conditions by the ultraviolet irradiation were set in the same manner as in the preparation of the sample at the initial adhesive strength.
[0048]
[Table 3]
Figure 2004352771
[0049]
[Table 4]
Figure 2004352771
[0050]
From the above results, it can be seen that the products of the examples have a high light transmittance of more than 90% at 1300 nm, which is a visible light region, and have excellent transparency. In addition, a high numerical value was obtained not only in the initial adhesive strength but also in the moisture-resistant adhesive strength, and no peeling was observed at all in the cross-cut peeling test regarding the adhesiveness, or the degree of peeling was very low, and the adhesiveness was excellent. You can see that.
[0051]
On the other hand, Comparative Examples 1 and 2 which did not use a specific silicone oil had low moisture-resistant adhesive strength, and had a high degree of peeling in a cross-cut peeling test relating to adhesiveness, resulting in poor adhesiveness. In particular, in Comparative Example 2 in which the proportion of the alicyclic epoxy resin was high, the degree of peeling was extremely high, and the moisture-resistant adhesive strength was extremely reduced. In addition, Comparative Example 3 using an ordinary epoxy resin and a specific silicone oil, and Comparative Example 4 using an alicyclic epoxy resin and an ordinary silicone oil also have low moisture-resistant adhesive strength, and have a cross-cut peel test. The degree of peeling was high and the adhesion was poor.
[0052]
【The invention's effect】
As described above, the present invention is an ultraviolet curable epoxy resin composition using the specific silicone oil (B) together with the alicyclic epoxy resin (A). For this reason, it has high transparency, high initial and post-moisture moisture-resistant adhesive strength, and has excellent adhesiveness by suppressing the occurrence of peeling from an object to be bonded. Accordingly, the ultraviolet-curable epoxy resin composition of the present invention can be used for bonding precision optical components such as optical waveguides and V-grooves in optical communication systems and for bonding fiber arrays, and for fixing small components such as lenses. When applied to an application for bonding with quartz glass, an adhesive joint having excellent long-term reliability can be realized.
[0053]
Then, the content of the silicone oil (B) represented by the general formula (1) is calculated based on the total amount of the alicyclic epoxy resin (A) and the silicone oil (B) represented by the general formula (1). , 10 to 50% by weight, it is possible to obtain more excellent adhesiveness and to obtain a better workability.
[0054]
Further, when 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate and hydrogenated bisphenol A type epoxy resin are used as the alicyclic epoxy resin (A), excellent adhesiveness and workability are obtained. Can be

Claims (3)

下記の(A)〜(C)を含有することを特徴とする紫外線硬化型エポキシ樹脂組成物。
(A)脂環式エポキシ樹脂。
(B)下記の一般式(1)で表されるシリコーンオイル。
Figure 2004352771
(C)光重合開始剤。
An ultraviolet-curable epoxy resin composition comprising the following (A) to (C).
(A) Alicyclic epoxy resin.
(B) A silicone oil represented by the following general formula (1).
Figure 2004352771
(C) a photopolymerization initiator.
上記一般式(1)で表されるシリコーンオイル(B)の含有量が、上記脂環式エポキシ樹脂(A)と一般式(1)で表されるシリコーンオイル(B)の合計量中、10〜50重量%の範囲に設定されている請求項1記載の紫外線硬化型エポキシ樹脂組成物。The content of the silicone oil (B) represented by the general formula (1) is 10% of the total amount of the alicyclic epoxy resin (A) and the silicone oil (B) represented by the general formula (1). The ultraviolet-curable epoxy resin composition according to claim 1, which is set in a range of from 50 to 50% by weight. 上記脂環式エポキシ樹脂(A)が、3,4−エポキシシクロヘキシルメチル−3,4−エポキシシクロヘキサンカルボキシレート、水添ビスフェノールA型エポキシ樹脂である請求項1または2記載の紫外線硬化型エポキシ樹脂組成物。3. The ultraviolet-curable epoxy resin composition according to claim 1, wherein the alicyclic epoxy resin (A) is 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate, a hydrogenated bisphenol A type epoxy resin. object.
JP2003149334A 2003-05-27 2003-05-27 Ultraviolet-curable epoxy resin composition Pending JP2004352771A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003149334A JP2004352771A (en) 2003-05-27 2003-05-27 Ultraviolet-curable epoxy resin composition

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003149334A JP2004352771A (en) 2003-05-27 2003-05-27 Ultraviolet-curable epoxy resin composition

Publications (1)

Publication Number Publication Date
JP2004352771A true JP2004352771A (en) 2004-12-16

Family

ID=34045476

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2003149334A Pending JP2004352771A (en) 2003-05-27 2003-05-27 Ultraviolet-curable epoxy resin composition

Country Status (1)

Country Link
JP (1) JP2004352771A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007238868A (en) * 2006-03-10 2007-09-20 Adeka Corp Curable composition for optical material and optical waveguide
JP2011111557A (en) * 2009-11-27 2011-06-09 Hitachi Chem Co Ltd Adhesive composition, circuit connecting material, connector and connection method of circuit member, and semiconductor device
JP2012140607A (en) * 2010-12-14 2012-07-26 Daicel Corp Curable composition and curable resin
WO2014186514A1 (en) * 2013-05-17 2014-11-20 Dow Corning Corporation Curable composition, method of preparing cured article, and cured article formed thereby
CN104540868A (en) * 2012-08-31 2015-04-22 株式会社大赛璐 Curable composition, cured product thereof, optical member and optical device
WO2015129503A1 (en) * 2014-02-28 2015-09-03 株式会社ダイセル Curable composition, cured product thereof, and wafer level lens
WO2016164585A1 (en) 2015-04-09 2016-10-13 Lyondell Chemical Technology, L.P. Improved catalyst performance in propylene epoxidation

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007238868A (en) * 2006-03-10 2007-09-20 Adeka Corp Curable composition for optical material and optical waveguide
WO2007105556A1 (en) * 2006-03-10 2007-09-20 Adeka Corporation Curable composition for optical material and optical waveguide
CN101410432B (en) * 2006-03-10 2011-12-28 株式会社Adeka Curable composition for optical material and optical waveguide
US8175439B2 (en) 2006-03-10 2012-05-08 Adeka Corporation Curable composition for optical material and optical waveguide
KR101323564B1 (en) 2006-03-10 2013-10-29 가부시키가이샤 아데카 Curable composition for optical material and optical waveguide
JP2011111557A (en) * 2009-11-27 2011-06-09 Hitachi Chem Co Ltd Adhesive composition, circuit connecting material, connector and connection method of circuit member, and semiconductor device
JP2012140607A (en) * 2010-12-14 2012-07-26 Daicel Corp Curable composition and curable resin
US10018810B2 (en) 2012-08-31 2018-07-10 Daicel Corporation Curable composition, cured product thereof, optical member and optical device
EP2891673B1 (en) * 2012-08-31 2019-08-14 Daicel Corporation Curable composition, cured product thereof, optical member and optical device
US11029497B2 (en) 2012-08-31 2021-06-08 Daicel Corporation Curable composition, cured product thereof, optical member and optical device
CN107674206B (en) * 2012-08-31 2021-05-25 株式会社大赛璐 Curable composition, cured product thereof, optical member, and optical device
EP3572447A1 (en) * 2012-08-31 2019-11-27 Daicel Corporation Use of curable composition, cured product thereof, optical member and optical device
CN104540868A (en) * 2012-08-31 2015-04-22 株式会社大赛璐 Curable composition, cured product thereof, optical member and optical device
CN107674206A (en) * 2012-08-31 2018-02-09 株式会社大赛璐 Solidification compound and its solidfied material, optical component and Optical devices
WO2014186514A1 (en) * 2013-05-17 2014-11-20 Dow Corning Corporation Curable composition, method of preparing cured article, and cured article formed thereby
US10435585B2 (en) 2013-05-17 2019-10-08 Dow Corning Corporation Curable composition, method of preparing cured article, and cured article formed thereby
JP2016526069A (en) * 2013-05-17 2016-09-01 ダウ コーニング コーポレーションDow Corning Corporation Curable composition, method for preparing cured article, and cured article formed by the method
US9856347B2 (en) 2014-02-28 2018-01-02 Daicel Corporation Curable composition, cured product thereof, and wafer level lens
TWI655220B (en) * 2014-02-28 2019-04-01 日商大賽璐股份有限公司 Hardenable composition and hardened material thereof, and wafer level lens
JPWO2015129503A1 (en) * 2014-02-28 2017-03-30 株式会社ダイセル Curable composition and cured product thereof, and wafer level lens
WO2015129503A1 (en) * 2014-02-28 2015-09-03 株式会社ダイセル Curable composition, cured product thereof, and wafer level lens
WO2016164585A1 (en) 2015-04-09 2016-10-13 Lyondell Chemical Technology, L.P. Improved catalyst performance in propylene epoxidation

Similar Documents

Publication Publication Date Title
JP5401767B2 (en) Curable composition and optical device
JP4810911B2 (en) Epoxy resin composition, epoxy resin film, optical waveguide, optical / electrical hybrid wiring board, and electronic device
JP4894720B2 (en) Optical waveguide and photoelectric composite substrate
JP2010018797A (en) Curable composition for optical parts, adhesive agent for optical parts, and sealing agent for organic electroluminescence element
JP4589211B2 (en) UV curable liquid resin composition for optics
KR102006993B1 (en) Energy-beam-curable resin composition
JP2010024364A (en) Resin composition
JP2007086536A (en) Filler composition and method for manufacturing hole-assisted fiber using the same
JP4421938B2 (en) UV curable resin composition
JP2004352771A (en) Ultraviolet-curable epoxy resin composition
JP4426198B2 (en) UV curable epoxy resin composition
JP2006008740A (en) Ultraviolet curable resin composition
JP2003096425A (en) Adhesive composition for fixing optical part
JP2004010674A (en) Ultraviolet light-curable adhesive
JP4268014B2 (en) UV curable epoxy resin composition
EP3561560A1 (en) Photosensitive epoxy resin composition for forming optical waveguide, curable film for forming optical waveguide, optical waveguide using same, and hybrid flexible printed wiring board for optical/electrical transmission
JP4142981B2 (en) UV-curable epoxy resin composition and process for producing the same
US20070284041A1 (en) Optical Adhesive Composition And Method For Bonding Optical Component
JP2008308589A (en) Curable composition and optical device using the same
JP3135108B2 (en) Adhesive for fixing optical parts
JP7063684B2 (en) Adhesives for optical imaging devices and their cured products
JP4331644B2 (en) UV curable resin composition
JP4261240B2 (en) UV curable epoxy resin composition
JP4142980B2 (en) UV curable epoxy resin composition
JP5116730B2 (en) UV curable epoxy resin composition

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20051114

A977 Report on retrieval

Effective date: 20080509

Free format text: JAPANESE INTERMEDIATE CODE: A971007

A131 Notification of reasons for refusal

Effective date: 20080715

Free format text: JAPANESE INTERMEDIATE CODE: A131

A02 Decision of refusal

Effective date: 20081125

Free format text: JAPANESE INTERMEDIATE CODE: A02