JP5110602B2 - 透明積層体及びその製造方法 - Google Patents
透明積層体及びその製造方法 Download PDFInfo
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- JP5110602B2 JP5110602B2 JP2008552137A JP2008552137A JP5110602B2 JP 5110602 B2 JP5110602 B2 JP 5110602B2 JP 2008552137 A JP2008552137 A JP 2008552137A JP 2008552137 A JP2008552137 A JP 2008552137A JP 5110602 B2 JP5110602 B2 JP 5110602B2
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Description
よって、これらの製造方法により製造された透明積層体は、気泡のない透明積層体となる。また、透明基板の周辺部に設けるシール部により完全に密封されているため、得られた透明積層体は、その後の過酷な使用条件においても周辺部からの剥がれなどが起こりにくく耐久性が高い。
また、上記製造方法によって透明積層体を製造することにより、硬化性樹脂組成物として粘度の高い組成物、又は分子量の高い硬化性化合物を使用できるので、硬化した際に強度の高い硬化樹脂となり、全体として機械的強度の高い透明積層体を得ることができる。したがって、本発明の透明積層体は、低粘度の硬化性樹脂組成物を注入して製造された従来の透明積層体と比較して、厚みが薄くても透明積層体の機械的強度を十分に得ることができる。
シラン化合物からなるカップリング剤は、シランカップリング剤と呼ばれるものであり、ケイ素原子に結合した有機基とケイ素原子に結合した加水分解性基を有する化合物が代表的な化合物である。チタン化合物からなるカップリング剤は、チタンカップリング剤と呼ばれるものであり、チタン素原子に結合した有機基とチタン素原子に結合した加水分解性基を有する化合物が代表的な化合物である。これらカップリング剤を表面処理剤として、予め、一対の透明基板の少なくとも一方の硬化性樹脂組成物が接する表面に塗布し、加熱するなどして透明基板表面に結合させる。
この圧力P1が100Paを超えると、透明積層体中の硬化樹脂層に残存する気泡が目立ち易くなり、この圧力P1が10Pa未満であると、減圧度が高いため、その減圧雰囲気を構築する際の時間的なロスが大きくなる。また、減圧度が高過ぎると、硬化性樹脂組成物に含まれる熱重合開始剤、又は光重合開始剤、重合禁止剤、光安定剤などの添加物が一部真空容器内で揮発するなどして、硬化不良を引き起こしたり、硬化後の硬化樹脂層の性能に悪影響を与え得るため好ましくない。
このように積層時よりも高い硬化時の圧力として大気圧を利用することで、硬化性樹脂組成物を硬化させるための圧力容器などの設備を無くすことができる。また、減圧雰囲気が10〜100Paの圧力雰囲気である場合には、減圧雰囲気との圧力差を十分に高くすることができる。
このような製造方法によれば、熱硬化性樹脂組成物の場合には熱を加え、光硬化性樹脂組成物の場合には紫外線を照射すればよい。又は、室温で長時間保持することで硬化できるような硬化性樹脂組成物を選んでもよい。硬化性樹脂組成物としては、特に紫外線で硬化しうる光硬化性の硬化性樹脂組成物が好ましい。例えば、熱硬化性樹脂組成物がアクリル酸エステルなどのアクリル系硬化性化合物を含む場合には、熱重合開始剤の開始反応を誘起させるために、例えば80℃に加熱する必要がある。一方、アクリル系硬化性化合物を含む光硬化性の硬化性樹脂組成物を紫外線で硬化させる場合には、紫外線を照射するだけでよいので、省エネルギーで硬化性樹脂組成物を硬化させることができる。また、紫外線硬化の場合には、温度も昇温しないため、環境負荷が小さく、熱変形に弱い透明基板であっても使用することができる。室温硬化の場合には、例えば1日ないし数日、硬化のために静置する必要があるが、紫外線硬化の場合、数分ないし数10分程度で実質的に硬化させることができ生産効率が高い。また、紫外線と熱を併用したり、紫外線硬化後に一定期間室温で保持することで硬化反応を完了させることもできる。
前記のように、本発明における硬化性樹脂組成物としては紫外線などの光の照射を受けて硬化しうる硬化性樹脂組成物が好ましい。この光硬化性の硬化性樹脂組成物は、硬化性化合物としてアクリロイルオキシ基を有する化合物(すなわち、アクリル酸エステル)やメタクリロイルオキシ基を有する化合物(すなわち、メタアクリル酸エステル)を含む硬化性樹脂組成物であることが好ましい。また、1分子あたりのこれら硬化性官能基の数は1〜3個であることが好ましい。硬化性樹脂組成物がこれら硬化性化合物の少なくとも1種と光重合開始剤とを有する光硬化性の硬化性樹脂組成物であることにより、前記紫外線等の光による硬化によりもたらされる特徴が十分に発揮される。
本発明は、本発明の製造方法によって製造されたことを特徴とする透明積層体を提供する。
本発明の透明積層体において、透明積層体を構成する一対の前記透明基板が、ガラス又は樹脂よりなることが好ましい。
透明積層体の透明基板がガラス板の場合には、建物や車両などの窓用ガラスとして使用される合わせガラスを提供できる。樹脂製透明基板としてポリカーボネイトを使用すれば、衝撃性が高く軽量な透明パネルを提供できる。この透明パネルもまた、建物や車両などの窓用ガラスとして使用できる。また、ガラス板と樹脂板とを、この硬化性樹脂組成物で接合した透明積層体であってもよい。
本発明の透明積層体は、前記一対の透明基板がほぼ同じ曲率を有する湾曲基板であることが好ましい。
フィルムを中間層として使用する従来の透明積層体では、透明基板が一定曲率以上の湾曲基板であると、フィルムに皺が生じるため、透明積層体の製造が困難であるが、硬化性樹脂組成物を硬化させることにより製造される、本発明の透明積層体は、形状が規制されない。このため、透明基板が三次元的に大きく湾曲した基板の場合には、湾曲した透明積層体となり特に有効となる。
本発明の前記シール部は、前記一対の透明基板間に挟持される硬化性樹脂組成物の粘性より高粘性の硬化性樹脂組成物を硬化させてなることが好ましい。
また、積層体を作製する際に高い温度や圧力を必要としないため環境負荷が小さくなる。
更にまた、透明基板の周辺部に設けるシール部により完全に密封されているため、その後の過酷な使用条件においても周辺部からの剥がれなどが起こりにくく耐久性が高い。
また、従来の注入法では実現困難な薄い樹脂層による積層体も容易に提供できる。
透明基板は、硬化性樹脂組成物が接する透明基板表面の少なくとも一方が、予め、シラン化合物及びチタン化合物から選ばれるカップリング剤で処理されていることが好ましい。シラン化合物からなるカップリング剤は、シランカップリング剤と呼ばれるものであり、ケイ素原子に結合した有機基とケイ素原子に結合した加水分解性基を有する化合物が代表的な化合物である。チタン化合物からなるカップリング剤は、チタンカップリング剤と呼ばれるものであり、チタン素原子に結合した有機基とチタン素原子に結合した加水分解性基を有する化合物が代表的な化合物である。ケイ素原子やチタン原子に結合した有機基は、その結合末端の原子が炭素原子であり、該炭素原子がこれら金属原子と結合している有機基である。具体的には、例えば、アルキル基、アルケニル基、官能基結合アルキル基などがある。官能基としては、例えば、アクリロイルオキシ基、メタクリロイルオキシ基、エポキシ基、アミノ基などがある。加水分解性基は、水と反応して水酸基を生じる基であり、例えば、アルコキシ基、塩素原子、アシル基、アミノ基などがある。
カップリング剤としては、ケイ素原子に結合した官能基結合アルキル基とアルコキシ基を有するシラン化合物であるシランカップリング剤が好ましい。これらカップリング剤は、硬化性樹脂組成物の硬化時に硬化性樹脂組成物中の硬化性化合物と化学結合可能な官能基を有することが好ましい。このような官能基としてはアクリロイルオキシ基やメタクリロイルオキシ基が挙げられる。具体的なシランカップリング剤としては、例えば、3−メタクリロイルオキシプロピルトリメトキシシランが挙げられる。
これらカップリング剤を表面処理剤として、予め、一対の透明基板の少なくとも一方の硬化性樹脂組成物が接する表面に塗布し、加熱するなどして透明基板表面に結合させる。この表面処理により、カップリング剤の加水分解性基が加水分解し、生成した水酸基によって基板表面に結合すると考えられる。表面処理方法としては、例えば、カップリング剤を溶剤に溶解してカップリング剤溶液を作製し、その溶液を透明基板表面に塗布するかまたは透明基板をその溶液に浸漬して引上げ、加熱して溶剤を蒸発除去し、その後加熱してカップリング剤を透明基板表面に結合させる方法が挙げられる。カップリング剤溶液の代わりに、カップリング剤を溶剤に溶解した後カップリング剤を部分的に加水分解させて得られる溶液を使用することもできる。
具体的には、例えば、シランカップリング剤:水:iPA(イソプロピルアルコール)=0.3:0.5:99.2の溶液を室温で10時間撹拌することでシランカップリング剤を加水分解させて一部がシラノール化した溶液を取得し、次いで、この溶液を透明基板に1分間浸漬して引き上げ、この後、150℃のオーブンで30分熱処理してガラス表面と反応させる。
上記表面処理を施した透明基板を使用することにより硬化樹脂の透明基板に対する接着性が向上し、透明積層体の機械的強度が向上する。
また、上記一対の透明基板は、ほぼ同じ曲率を有する湾曲基板であってもよい。フィルムを中間層として使用する従来の透明積層体では、透明基板が湾曲基板であると、フィルムに皺が生じるため、透明積層体の製造が困難な場合があった。硬化性樹脂組成物を透明基板間で挟持して硬化させることにより製造される透明積層体は、形状は規制されない。このため、透明基板として三次元的に湾曲した透明基板を使用しても良好な三次元的に湾曲した透明積層体が得られる。これは、従来のフィルムを使用する合わせガラスの製法では、達成することのできない形態である。
まず、一対の透明基板のうち一方の透明基板を取り出し、この一方の透明基板の周辺部に沿ってシール部を設置する。このシール部は、両面接着テープなどのシール部材を貼着することによって設けることができる。次に、一方の透明基板の前記シール部に囲まれた領域に硬化性樹脂組成物を供給する。硬化性樹脂組成物の供給量は、シール部と一対の透明基板とによって密封される空間が硬化性樹脂組成物によって充填されるだけの量に予め設定されている。この時、硬化性樹脂組成物の硬化収縮による体積減少を予め考慮して硬化後の樹脂層の体積を定めることができる。供給方法は、一方の透明基板を平置きにし、ディスペンサー又はダイコーターのような供給手段によって点状、線状又は面状に供給すればよい。次いで、減圧雰囲気下、例えば真空(略真空を含む)雰囲気下において、他方の透明基板をシール部を介して重ね合わせることにより、一対の透明基板間に硬化性樹脂組成物を挟持して密封する。さらに、必要により、その減圧雰囲気下で所定時間硬化性樹脂組成物を挟持する。この後、前記減圧雰囲気をそれよりも高い圧力(例えば大気圧)の雰囲気に変えると、上昇した圧力によって一対の透明基板同士が密着する方向に押圧されると同時に、上記密封された空間に残留する空孔部の体積がその雰囲気の差圧に応じて縮減することから、一対の透明基板とシール部で密閉された密閉空間における減圧の空間に硬化性樹脂組成物が流動していき、密閉空間全体が硬化性樹脂組成物によって均一に充填される。この後、硬化性樹脂組成物を硬化させることにより、本発明の透明積層体が製造される。
上記減圧雰囲気としては、減圧雰囲気の圧力をP1とした時、下記の式を満足する減圧雰囲気であることが好ましい。
10Pa≦P1≦100Pa
P1が100Paを超えると、透明積層体の硬化性樹脂に残存する気泡が目立ち易くなり、10Pa未満であると、減圧度が高いため、その減圧雰囲気を構築する際の負担や時間的なロスが大きくなるからである。また、減圧度が高過ぎると、硬化性樹脂組成物に含まれる硬化性化合物や他の成分(熱重合開始剤又は光重合開始剤、重合禁止剤、光安定剤など)に悪影響を与えるため好ましくないからである。例えば、減圧度が高過ぎるとこれらの化合物が気化するおそれがある。より好ましいP1は、30〜50Paである。
一対の透明基板間に硬化性樹脂組成物を挟持して密封し、さらに、その減圧雰囲気下で所定時間硬化性樹脂組成物を挟持する場合、硬化性樹脂組成物を密封した時点から雰囲気圧力を上げるまでの減圧雰囲気保持時間は特に限定されない。密封状態が維持される限り、硬化性樹脂組成物の密封後直ちに雰囲気圧力を上げてもよい。密封後ある時間減圧状態を維持することにより、硬化性樹脂組成物が密閉空間内を流れて透明基板間の距離が均一となり、雰囲気圧力を上げても密封状態が維持しやすくなる。この減圧保持時間は、数時間以上の長時間であってもよいが、生産効率の面から1時間以内が好ましく、特に10分以内が好ましい。
上記減圧雰囲気よりも高い圧力雰囲気としては大気圧が好ましい。大気圧雰囲気であれば、硬化性樹脂組成物を硬化させるための特別な設備が不要となる。しかし、これに限定されるものではなく、上記減圧雰囲気の圧力より高い圧力としては、減圧雰囲気の圧力よりも50kPa以上高い圧力、特に100kPa以上高い圧力が好ましい。
本発明における硬化性樹脂が、熱硬化性樹脂組成物の場合には熱を加え、光硬化性樹脂組成物の場合には紫外線を照射すればよい。又は、室温で長時間保持することで硬化できるような硬化性樹脂組成物を選んでもよい。更に、硬化性樹脂組成物は、熱重合開始剤や光重合開始剤以外にこれら重合開始剤より少ない量の重合禁止剤を含むことが好ましい。重合禁止剤の含有により硬化性樹脂組成物の安定性を改善でき、硬化後の樹脂層の分子量を調整することもできる。更に、硬化性樹脂組成物は紫外線吸収剤やラジカル捕獲剤のような光安定剤を含むことが好ましい。光安定剤の含有により硬化後の樹脂層の耐光性を改善することができ好ましい。
Vr≦50Pa・s(但し、硬化性樹脂組成物の40℃での粘度)
25℃でのVrが0.2Pa・s未満とするためには、硬化性樹脂組成物に低分子量の硬化性化合物をある一定以上添加する必要があり、このため、硬化前後での収縮が大きくなり、硬化樹脂に歪みが残り機械的強度が低下する。また、40℃でのVrが50Pa・sを超えると、透明積層体の製造過程において硬化性樹脂組成物の流動性が低下するため、例えば硬化性樹脂組成物挟持後に大気開放しても、その流動性の悪さから硬化性樹脂組成物が透明基板の間隙全体に広がるまでに時間を要する。そのため、透明基板の間隙内に硬化性樹脂組成物が存在しない空間が消滅するまでに長時間を要し、製造タクトの低下を引き起こし易い。硬化性樹脂組成物の25℃における粘度が0.5Pa・s以上であり、かつ40℃における粘度が10Pa・s以下であるとより好ましい。
また、粘度の高い硬化性樹脂組成物、又は分子量の高い硬化性化合物を含む組成物の方が、硬化樹脂中の化学結合手の数を少なくできることから、硬化前後での収縮が小さいため、硬化樹脂の機械的強度を上げることができる。一方で硬化性オリゴマーなどの分子量の大きい硬化性化合物の多くは粘性が高い。そのため、機械的強度を確保しつつ減圧積層時の気泡残りを抑制する面では、高分子量の硬化性オリゴマーに、より分子量の小さい硬化性モノマーを溶解させて粘度を調整して使用するのが好ましい。高分子量の硬化性オリゴマーとしては分子量1000以上が好ましく、分子量2000以上がさらに好ましい。以上の粘度、及び分子量の観点から、分子量が1000以上の硬化性化合物を含み、40℃での粘度が50Pa・s以下の硬化性樹脂組成物が本発明の透明積層体を製造する上で好ましい。
一方、透明積層体においては、一対の透明基板の間隔、すなわち、硬化樹脂層の厚みをTs、透明基板のいずれか薄い方の厚みをT1、他方の厚みをT2としたとき、Tsは下記の式を満足することが好ましい。なお、T1とT2とは同じ厚みの場合もある。
硬化樹脂層の厚みTsが透明基板の薄い方の厚みに対して5%未満であると、透明積層体としての強度を確保することができず、透明基板の厚い方の厚みに対して150%を超えると透明積層体の厚みが無用に厚くなる。
透明積層体における硬化樹脂層の厚みが一定である場合、シール部の厚みも硬化樹脂層の厚みTsに等しい。シール材として非圧縮性の両面接着テープのみを使用した場合はシール部の厚みは両面接着テープの厚みにほぼ等しくなる。また、両面接着テープの上面にシール部形成用の硬化性樹脂組成物を使用した場合(図3参照)は、両面接着テープの厚みと硬化性樹脂組成物の硬化物層との合計厚みにほぼ等しくなる。スペーサー粒子を混合した硬化性樹脂組成物からなるシール材を使用した場合は、シール部の厚みはスペーサー粒子の大きさによって規制される。
硬化樹脂層の透過率Irに対してシール部の透過率Isが上記式を満足することにより、透明積層体全体が略同一の透過性を有するので、透明積層体全体を透光体として使用することができる。
本発明における硬化性樹脂組成物は、光や熱の作用により硬化して硬化樹脂を形成する硬化性樹脂組成物である。室温で長時間保持することにより硬化する室温硬化性樹脂であってもよい。硬化性樹脂は、重合性の各種ビニル基を有する化合物と重合開始剤を含む組成物が好ましい。また、ビニル基とチオール基との反応で硬化するタイプの硬化性樹脂組成物やエポキシ基と光によりカチオンを生成する光カチオン発生剤との組み合わせにより硬化するタイプの硬化性樹脂組成物、ケイ素原子に結合したビニル基とケイ素原子に結合した水素原子との反応により硬化するタイプの硬化性樹脂組成物、なども使用できる。特に、アクリロイルオキシ基及びメタクリロイルオキシ基から選ばれる硬化性基を有する化合物の少なくとも1種と光重合開始剤とを有する光硬化性の硬化性樹脂組成物であることが、効果速度が速く、硬化樹脂の透明性が高いことより好ましい。
アクリロイルオキシ基及びメタクリロイルオキシ基から選ばれる硬化性基(以下、(メタ)アクリロイルオキシ基という)を有する化合物(以下、(メタ)アクリレート系化合物ともいう)としては、1分子あたり(メタ)アクリロイルオキシ基を1〜6個有する化合物が好ましい。特に、硬化樹脂が硬くなり過ぎないようにするためには、1分子あたり(メタ)アクリロイルオキシ基を1〜3個有する化合物が好ましい。(メタ)アクリレート系化合物は、比較的低分子の化合物(以下、アクリレート系モノマーという)であってもよく、繰り返し単位を有する比較的高分子量の化合物(以下、(メタ)アクリレート系オリゴマーという)であってもよい。また、(メタ)アクリレート系化合物としては、硬化樹脂層の耐光性の面では、芳香環をできるだけ含まない脂肪族系又は脂肪族環系の化合物を使用することが好ましい。
(メタ)アクリレート系モノマーとしては、チャンバー内での減圧下の雰囲気で透明基板への供給を行う場合を考慮すると、揮発性を充分抑制できる程度低い蒸気圧を有する化合物を用いることが好ましい。(メタ)アクリレート系オリゴマーとしては、ポリウレタン鎖、ポリエステル鎖、ポリエーテル鎖、ポリカーボネイト鎖などの繰り返し単位を2個以上有する鎖と(メタ)アクリロイルオキシ基とを有する分子構造の(メタ)アクリレート系オリゴマーが好ましい。例えば、ウレタンアクリレートオリゴマーと呼ばれる、ウレタン鎖(通常さらにポリエステル鎖やポリエーテル鎖を含む)と2個以上の(メタ)アクリロイルオキシ基とを有する(メタ)アクリレート系オリゴマーを使用できる。前記のように、オリゴマーの分子量は1000以上が好ましく、2000以上がさらに好ましい。(メタ)アクリレート系オリゴマーの粘度が高すぎる場合には、アクリレート系モノマーと併用して(メタ)アクリレート系化合物全体としての粘度を低下させることが好ましい。
また、(メタ)アクリレート系化合物として、分子内に水酸基を有する化合物を用いると、透明基板、特にガラス基板との密着性を改善でき好ましい。(メタ)アクリレート系化合物全体に対して、水酸基を有する(メタ)アクリレート系化合物を重量比で30%以上含むことが好ましく、50%以上含むことが更に好ましい。
本発明における硬化性樹脂組成物は、(メタ)アクリレート系化合物と光重合開始剤とを含む光硬化性の硬化性樹脂組成物であることが好ましい。この光硬化性の硬化性樹脂組成物は、紫外線や可視光の照射により硬化し、硬化樹脂となる。硬化性樹脂組成物中の(メタ)アクリレート系化合物としては、アクリレート系モノマーの1種以上、(メタ)アクリレート系オリゴマーの1種以上、またはアクリレート系モノマーの1種以上と(メタ)アクリレート系オリゴマーの1種以上とからなる。特に、(メタ)アクリレート系オリゴマーの1種以上からなるか、(メタ)アクリレート系オリゴマーの1種以上とアクリレート系モノマーの1種以上とからなることが好ましい。
上記光硬化性の硬化性樹脂組成物における光重合開始剤の代わりに熱重合開始剤を使用することにより、(メタ)アクリレート系化合物を含む熱硬化性の硬化性樹脂組成物となる。このような光硬化性や熱硬化性の硬化性樹脂組成物には、光重合開始剤や熱重合開始剤以外に、重合禁止剤、光安定剤、紫外線吸収剤、酸化防止剤などの各種添加剤を含んでいてもよい。このような硬化性樹脂組成物の粘度は、前記のように、25℃での粘度が0.2Pa・s以上、かつ、40℃での粘度が50Pa・s以下であることが好ましい。
[重合開始剤]
(メタ)アクリレート系化合物を光硬化させる光重合開始剤、ポリエン化合物とポリチオール化合物とを反応させる光重合開始剤としては、アセトフェノン系、ケタール系、ベンゾイン又はベンゾインエーテル系、フォスフィンオキサイド系、ベンゾフェノン系、チオキサントン系やキノン系などを使用することができ、特に、ベンゾインイソプロピルエーテルなどのベンゾインエーテル系や、アセトフェノン系の光重合開始剤が好ましい。また、エポキシ化合物を硬化させる光カチオン発生剤としては、オニウム塩系の化合物などを使用することができる。
重合禁止剤としては、2,5,-ジ-t-ブチルハイドロキノンなどのハイドロキノン系やp-t-ブチルカテコールなどのカテコール系、アンスラキノン系やフェノチアジンやヒドロキシトルエン系を使用することができる。光安定剤としては、ベンゾトリアゾール系、ベンゾフェノン系、サリチレート系などの紫外線吸収剤や、ヒンダードアミン系などのラジカル捕獲剤を使用することができる。その他酸化防止剤として、リン系やイオウ系の化合物を使用してもよい。また、透明な着色硬化樹脂層を形成するために各種顔料や染料を硬化性樹脂組成物に添加してもよい。前記重合開始剤やこれら各種添加剤は、減圧下の雰囲気で使用するために比較的分子量の大きい、減圧下での蒸気圧の小さい化合物を用いることが好ましい。
まず、長さ610mm、幅610mm、厚み2mmのソーダライムガラス(基板Aと呼ぶ)のガラス端部より、厚み1mmで幅10mmの両面接着テープ(シール材)を離型フィルムを剥がして、基板Aの4辺部に沿って貼合した。次に、ウレタンアクリレートオリゴマー(共栄社化学社製 UF8001G)100部とベンゾインイソプロピエーテル(重合開始剤)1部を均一に混合し、この混合した紫外線硬化性樹脂組成物を前記両面接着テープの上面に、塗布厚み約0.3mmでディスペンサーにて塗布した。
紫外線硬化型の透明な硬化性樹脂組成物(組成物Qと呼ぶ)として、例1と同じウレタンアクリレートオリゴマー(共栄社化学社製 UF8001G)70部、単官能アクリレートモノマー(ダイセル・サイテック社製 EBECRYL 112)30部、ベンゾインイソプロピエーテル1部を均一に混合したものを用い、減圧下にて脱泡処理を行った。例1と同様にして40℃にて組成物Qの粘度を測定したところ、9.5Pa・sであった。なお、この結果より組成物Qの温度が25℃の場合の粘度は、樹脂の温度依存性を考慮すると、少なくとも0.5Pa・sを超えることは明らかである。
例1と同形状かつ同厚の一対のソーダライムガラス基板を、例1で用いた厚み1mmで幅10mmの両面接着テープを基板周辺部4辺に設置して1辺の両面接着テープの離型フィルムのみを残し、一対のガラス基板を張り合わせた。
なお、2006年12月28日に出願された日本特許出願2006−354969号の明細書、特許請求の範囲、図面及び要約書の全内容をここに引用し、本発明の明細書の開示として、取り入れるものである。
Claims (12)
- 一対の透明基板と、該一対の透明基板間に存在する硬化性樹脂組成物の硬化物の層とを有する透明積層体の製造方法であって、一方の透明基板上の周辺部に、前記一対の透明基板との間で前記硬化性樹脂組成物を封じ込めるためのシール部を形成し、前記一方の透明基板を平置きにして、前記一方の透明基板上の前記シール部で囲まれた領域に前記硬化性樹脂組成物を点状、線状又は面状に供給し、減圧雰囲気下にて前記供給された硬化性樹脂組成物の上に他方の透明基板を重ねて一対の透明基板間に硬化性樹脂組成物を挟持して密封し、次いで、硬化性樹脂組成物を挟持した一対の透明基板を前記減圧雰囲気より高い圧力雰囲気下に置き、前記圧力雰囲気下にて硬化性樹脂組成物を硬化させることを特徴とする透明積層体の製造方法。
- 前記一対の透明基板がほぼ同じ曲率を有する湾曲基板である、請求項1に記載の製造方法。
- 硬化性樹脂組成物が接する透明基板表面の少なくとも一方が、予め、シラン化合物及びチタン化合物から選ばれるカップリング剤で処理されている、請求項1又は2に記載の製造方法。
- 一対の透明基板間に硬化性樹脂組成物を挟持する減圧雰囲気が、10〜100Paの圧力雰囲気である、請求項1〜3のうちいずれか一つに記載の製造方法。
- 硬化性樹脂組成物を硬化させる圧力雰囲気が大気圧である、請求項1〜4のうちいずれか一つに記載の製造方法。
- 硬化性樹脂組成物を加熱又は紫外線照射によって硬化させる、請求項1〜5のうちいずれか一つに記載の製造方法。
- 硬化性樹脂組成物の25℃における粘度が0.2Pa・s以上であり、かつ40℃における粘度が50Pa・s以下である、請求項1〜6のうちいずれか一つに記載の製造方法。
- 硬化性樹脂組成物が、アクリロイルオキシ基及びメタクリロイルオキシ基から選ばれる硬化性基を1分子あたり1〜3個有する化合物の少なくとも1種と光重合開始剤とを有する光硬化性の硬化性樹脂組成物である、請求項1〜7のうちいずれか一つに記載の製造方法。
- 請求項1〜8のうちいずれか一つに記載の製造方法によって製造されたことを特徴とする透明積層体。
- 前記透明積層体を構成する一対の透明基板が、ガラス又は樹脂よりなる請求項9に記載の透明積層体。
- 前記一対の透明基板がほぼ同じ曲率を有する湾曲基板である請求項9又は10に記載の透明積層体。
- 前記シール部は、前記一対の透明基板間に挟持される硬化性樹脂組成物の粘性より高粘性の硬化性樹脂組成物を硬化させてなる請求項9〜11のうちいずれか一つに記載の透明積層体。
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CN101588922A (zh) | 2009-11-25 |
US8409385B2 (en) | 2013-04-02 |
EP2100725A1 (en) | 2009-09-16 |
WO2008081838A1 (ja) | 2008-07-10 |
US8734955B2 (en) | 2014-05-27 |
EP2505352B1 (en) | 2013-07-10 |
EP2100725A4 (en) | 2011-02-23 |
EP2505352A1 (en) | 2012-10-03 |
CN101588922B (zh) | 2013-05-08 |
US20100215966A1 (en) | 2010-08-26 |
JP2013047007A (ja) | 2013-03-07 |
JPWO2008081838A1 (ja) | 2010-04-30 |
US20130004735A1 (en) | 2013-01-03 |
EP2100725B1 (en) | 2012-09-19 |
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