[0017] 首先，詳細說明本發明之交聯性有機聚矽氧烷組成物。 (A)成分，係為與(B)成分組合而左右交聯有機聚矽氧烷組成物的物性之重要成分，以平均單位式： (R1 3
SiO1/2
)a
(R1 2
SiO2/2
)b
(R1
SiO3/2
)c
(SiO4/2
)d
(R2
O1/2
)e
所表示之含有包含至少1個聯苯基之芳基之烯基官能性分枝狀有機聚矽氧烷。本發明者們係發現到：藉由使此(A)成分含有包含至少1個聯苯基之芳基，可提高耐腐蝕氣體性、折射率、及切割性。 [0018] 式中，R1
為碳原子數1～14的一價烴基，該一價烴基中，至少1個為碳原子數2～6的烯基且至少1個為芳基，該芳基中，至少1個為聯苯基。複數個R1
可互為相同或相異。一價烴基，可例示出碳原子數1～6的烷基、碳原子數2～6的烯基、碳原子數6～14的芳基等，碳原子數1～6的烷基，可例示出甲基、乙基、丙基、丁基、戊基、己基等，較佳為甲基、乙基。此外，碳原子數6～14的芳基，除了含有聯苯基作為必要成分之外，可例示出取代或無取代之苯基、萘基、蒽基。碳原子數2～6的烯基，可例示出乙烯基、烯丙基、丁烯基、戊烯基、己烯基。式中，R2
表示氫原子或碳原子數1～6的烷基，可例示出甲基、乙基、丙基、丁基、戊基、己基等，較佳為甲基、乙基。複數個R2
可互為相同或相異。 [0019] 此外，式中，a表示顯示以一般式：R1 3
SiO1/2
所表示之矽氧烷單位的比率之數，為滿足0≦a≦0.1，較佳為滿足0≦a≦0.08之數。此係由於當a超過上述範圍的上限時，流動性變得過高，所得到之硬化物(本說明書中，硬化物與交聯物同義)無法得到於室溫下之充分的強度與硬度之故。b表示顯示以一般式：R1 2
SiO2/2
所表示之矽氧烷單位的比率之數，為滿足0.2≦b≦0.9，較佳為滿足0.3≦b≦0.7之數。此係由於當b未達上述範圍的下限時，折射率無法成為較佳的高折射率，超過上述範圍的上限時，所得到之硬化物無法得到於室溫下之充分的硬度之故。此外，式中，c表示顯示以一般式：R1
SiO3/2
所表示之矽氧烷單位的比率之數，為滿足0.1≦c≦0.6，較佳為滿足0.2≦c≦0.6之數。此係由於當c未達上述範圍的下限時，所得到之硬化物無法得到於室溫下之充分的硬度，另一方面，超過上述範圍的上限時，所得到之硬化物的可撓性變得不充分之故。此外，d表示顯示以一般式：SiO4/2
所表示之矽氧烷單位的比率之數，為滿足0≦d≦0.2，較佳為滿足0≦a≦0.1之數。此係由於當d超過上述範圍的上限時，所得到之硬化物的可撓性變得不充分之故。此外，e表示顯示以一般式：R2
O1/2
所表示之分枝狀有機矽氧烷之末端的比率之數，為滿足0≦e≦0.1之數。此係由於當e超過上述範圍的上限時，所得到之硬化物無法得到於室溫下之充分的硬度之故。尚且，式中，a、b、c、d及e的合計為1。當a、d及e分別表示0時，(A)成分以平均單位式：(R1 2
SiO2/2
)b
(R1
SiO3/2
)c
所表示。 [0020] (B)成分，係為與(A)成分組合而左右交聯有機聚矽氧烷組成物的物性之第2成分，為於一分子中具有至少2個烯基、與至少1個芳基，且於一分子中具有至少3個以一般式(1)：R3 3
SiO1/2
所表示之聚矽氧烷的末端矽氧烷單位，之具有於25℃時黏度為20Pa‧s以下之流動性之含有芳基之烯基官能性分枝狀有機聚矽氧烷。(B)成分，較佳係具有於25℃時黏度為20Pa‧s以下之流動性。式中，R3
表示取代或非取代的一價烴基。一價烴基，可例示出碳原子數1～6的烷基、碳原子數2～6的烯基、碳原子數6～14的芳基等，碳原子數1～6的烷基，可例示出甲基、乙基、丙基、丁基、戊基、己基等，較佳為甲基、乙基。此外，碳原子數6～14的芳基，可例示出取代或無取代之聯苯基、苯基、萘基、蒽基。碳原子數2～6的烯基，可例示出乙烯基、烯丙基、丁烯基、戊烯基、己烯基。複數個R3
可互為相同或相異。分枝狀有機聚矽氧烷，亦可為藉由於一分子中具有至少3個以一般式：R3 3
SiO1/2
所表示之聚矽氧烷的末端矽氧烷單位，而構成為具有於25℃時黏度為 100Pa‧s(亦即100000m Pa‧s)以下之流動性之聚矽氧烷。此外，藉由控制(B)成分的製造方法，可將三維結構之烯基官能性分枝狀有機聚矽氧烷的分子量控制在較佳範圍，而構成為具有於25℃時黏度為較佳範圍以下之流動性之聚矽氧烷。由於具有此分枝狀結構，同時於25℃時具有流動性，所以可得到硬化速度快且無硬化物的表面黏滯之組成物。 尚且，於25℃時黏度為100Pa‧s時，對該業者而言可明瞭的是於25℃時具有流動性。 如此之(B)成分，於25℃時黏度較佳為50000m Pa‧s以下，尤佳為30000m Pa‧s以下，特佳為20000m Pa‧s以下。 [0021] 如此之(B)成分，可例示出以平均單位式：(R4 3
SiO1/2
)f
(R4 2
SiO2/2
)g
(R4
SiO3/2
)h
(SiO4/2
)i
所表示之含有芳基之烯基官能性分枝狀有機聚矽氧烷。在此，R4
為碳原子數1～14的一價烴基，該一價烴基中，至少2個為碳原子數2～6的烯基且至少1個為芳基。一價烴基，可例示出碳原子數1～6的烷基、碳原子數2～6的烯基、碳原子數6～14的芳基等，碳原子數1～6的烷基，可例示出甲基、乙基、丙基、丁基、戊基、己基等，較佳為甲基、乙基。此外，碳原子數6～14的芳基，可例示出取代或無取代之聯苯基、苯基、萘基、蒽基。碳原子數2～6的烯基，可例示出乙烯基、烯丙基、丁烯基、戊烯基、己烯基。複數個R4
可互為相同或相異。式中，f、g、h、i為滿足0＜f≦0.8、0≦g≦0.96、0＜(h+i)、0.5≦f/(h+i)≦4、且f+g+h+i=1之數。在此，f為規定用以得到於25℃時20Pa‧s以下之流動性之以一般式：R4 3
SiO1/2
所表示之聚矽氧烷之末端矽氧烷單位的量之數，h與i為規定用以使有機聚矽氧烷採取分枝狀結構之成分之數，f與h+i中任一者必須為大於0之數。此外，為了得到於25℃時20Pa‧s以下之流動性，相對於分枝點之以一般式：R3 3
SiO1/2
所表示之聚矽氧烷之末端矽氧烷單位的量之比f/(h+i)，必須為0.5以上，最大為4。以一般式：R4 2
SiO2/2
所表示之直鏈狀成分並不一定是必要成分，但為了得到必要的黏度，可導入作為聚合物內的成分，可為於0≦g≦0.96的範圍，較佳為0≦g≦0.90。 (B)成分，較佳亦可為以平均組成式：(R4 3
SiO(R4 2
SiO)m
)e
Si R4 (4-e)
(式中，R4
為碳原子數1～14的一價烴基，該一價烴基中，至少2個為碳原子數2～6的烯基且至少1個為芳基，m表示0以上200以下的整數，e表示3或4)所表示之含有芳基之烯基官能性分枝狀有機聚矽氧烷之樣態。式中，m表示直鏈狀矽氧烷單位的數，為滿足0≦m≦200，較佳為0≦m≦100之整數。式中，e表示3或4，為規定用以形成分枝狀有機聚矽氧烷的分枝點之結構之數字，e為3時，成為T型的分枝點，e為4時，成為十字型的分枝點。 [0022] 此外，(B)成分的例子，可列舉出：使以式：R5
R6 2
SiO(R6 2
SiO)n
SiR5
R6 2
所表示之含有芳基及烯基之直鏈狀有機聚矽氧烷，與以式：(HR7 2
SiO)j
SiR7 (4-j)
(R7
為碳原子數1～14的一價烴基，j表示3或4)所表示之含有鍵結有矽原子之氫原子之矽氧烷低聚物進行矽氫化反應而成，之於生成物的一分子中具有至少3個烯基，並且無鍵結有矽原子之氫原子之含有芳基之烯基官能性分枝狀有機聚矽氧烷。式中，R5
表示碳原子數2～6的烯基，可例示出乙烯基、烯丙基、丁烯基、戊烯基、己烯基，R6
表示至少1個為芳基之碳原子數1～14的一價烴基，該一價烴基，可例示出碳原子數1～6的烷基、碳原子數6～14的芳基等，碳原子數1～6的烷基，可例示出甲基、乙基、丙基、丁基、戊基、己基等，較佳為甲基、乙基。此外，碳原子數6～14的芳基，可例示出取代或無取代之苯基、聯苯基、萘基、蒽基。複數個R5
、R6
及R7
分別可互為相同或相異。式中，n表示直鏈狀矽氧烷單位的數，為滿足0≦n≦200，較佳為0≦n≦100之整數。此係由於當n超過上述範圍的上限時，所得到之分枝狀有機聚矽氧烷的黏度於25℃時超過25Pa‧s之故。式中，R7
表示不含烯基之碳原子數1～14的一價烴基，可例示出甲基、乙基、丙基、丁基、戊基、己基，或是取代或無取代之聯苯基、苯基、萘基、蒽基等之芳基。此外，式中，j表示3或4，為規定用以形成分枝狀有機聚矽氧烷的分枝點之結構之數字，j為3時，成為T型的分枝點，j為4時，成為十字型的分枝點。 [0023] 為了發揮本發明之效果，(A)成分與(B)成分之混合比率，以A/B的重量比計為1/100至100/1，較佳為1/50～50/1，尤佳為1/20～20/1。 實施例中，(A)成分與(B)成分之量以重量份來記載，對該業者而言可明瞭的是本說明書中之(A)成分與(B)成分之混合比率是以重量比來表示。 [0024] (C)成分，為本發明之交聯性有機聚矽氧烷組成物(以下亦稱為本組成物)的交聯劑，為於一分子中具有至少2個鍵結有矽原子之氫原子，且鍵結有矽原子之有機基的12～70莫耳%為芳基之有機聚矽氧烷。(C)成分中之鍵結有矽原子之氫原子至少2個。此係由於當鍵結有矽原子之氫原子於一分子中未達2個時，所得到之硬化物無法得到於室溫下之充分的機械強度之故。(C)成分中之鍵結有矽原子之有機基，可例示出甲基、乙基、丙基、丁基、戊基、己基等之烷基，環戊基、環己基等之環烷基，苯基、甲苯基、萘基、蒽基、聯苯基等之芳基等。(C)成分，其鍵結有矽原子之有機基的12～70莫耳%為芳基。此係由於當芳基的含量脫離上述範圍時，(A)成分與(B)成分的混合物之相溶性變差，所得到之硬化物失去透明性，機械特性亦變差之故。鍵結有矽原子之氫原子，與Si-H同義。 [0025] 此(C)成分，可例示出以一般式：(HR8 2
SiO)2
SiR8 2
、(HR8 2
SiO SiR8 2
)2
O、(HR8 2
SiO)3
SiR8
、((HR8 2
SiO)2
SiR8
)2
O所表示之化合物等。式中，R8
為碳原子數1～14的一價烴基，該一價烴基中，至少1個為芳基，該一價烴基，可例示出碳原子數1～6的烷基、碳原子數6～14的芳基等，碳原子數1～6的烷基，可例示出甲基、乙基、丙基、丁基、戊基、己基等，較佳為甲基、乙基。此外，碳原子數6～14的芳基，可例示出取代或無取代之聯苯基、苯基、萘基、蒽基。複數個R8
可互為相同或相異。尚且，R8
內，芳基的含量為12～70莫耳%的範圍。 [0026] 本組成物中，(C)成分的含量，為使本成分中之鍵結有矽原子之氫原子相對於(A)成分中與(B)成分中之烯基的合計之莫耳比成為0.5～2的範圍內之量，較佳成為0.5～1.5的範圍內之量。此係由於當(C)成分的含量為上述範圍外時，所得到之硬化物於室溫下的機械強度不充分之故。 [0027] (D)成分，為用以促進(A)成分及(B)成分的烯基與(C)成分中之鍵結有矽原子之氫原子之矽氫化反應的矽氫化反應用觸媒。(D)成分可例示出鉑系觸媒、銠系觸媒、鈀系觸媒，從可顯著促進本組成物的交聯者來看，較佳為鉑系觸媒。尤其從觸媒活性的高低來看，較佳為鉑-烯基矽氧烷錯合物，從錯合物的穩定性良好者來看，較佳為具有1,3-二乙烯基-1,1,3,3-四甲基二矽氧烷作為配位基之鉑錯合物。 [0028] 本組成物中，(D)成分的含量，只要是為促進(A)成分及(B)成分的烯基與(C)成分中之鍵結有矽原子之氫原子之矽氫化反應充分的量即可，並無特別限定。較佳者，相對於本組成物，(D)成分中的金屬原子以重量(通常與質量同義)單位計為0.1ppm至100ppm的範圍內之量為佳。此係由於當(D)成分的含量未達上述範圍的下限時，所得到之組成物無法充分地交聯，或是無法以充分的速度交聯，另一方面，超過上述範圍的上限時，於所得到之組成物會有產生著色等問題之疑慮之故。 [0029] 本組成物，含有上述(A)成分至(D)成分，但亦可以任意地改變硬化速度之目的添加反應抑制劑作為其他任意成分。反應抑制劑，可例示出2-甲基-3-丁烯-2-醇、2-苯基-3-丁烯-2-醇、乙炔基環己醇等之炔醇，1,3,5,7-四甲基-1,3,5,7-四乙烯基環四矽氧烷、苯并三唑等。此等反應抑制劑的含量並無特別限定，相對於本組成物的重量，較佳為1ppm～1000ppm的範圍內。 [0030] 此外，當因應用途而要求與基材之接著性時，本組成物中可含有接著促進劑。此接著促進劑，可列舉出於一分子中具有三烷氧矽基(例如三甲氧矽基或三乙氧矽基)與矽氫基、環氧基(例如3-環氧丙氧基丙基)、烯基(例如乙烯基或烯丙基)之有機矽烷或有機矽氧烷低聚物等。 [0031] 再者，本組成物，在不損及本發明之目的下，作為其他任意成分，可含有前述(A)成分至(C)成分以外的有機聚矽氧烷、無機質填充劑(例如二氧化矽、玻璃、氧化鋁、氧化鋅等)、聚甲基丙烯酸酯樹脂等之有機樹脂微粉末、耐熱劑、染料、顏料、螢光體、阻燃性賦予劑、溶劑等。 前述(A)成分至(C)成分以外的有機聚矽氧烷，可列舉出直鏈狀的烯基官能性有機聚矽氧烷，但本發明之交聯性有機聚矽氧烷組成物不含烯基官能性直鏈狀有機聚矽氧烷。本發明中，亦可不使用以往被視為必要成分之直鏈狀的烯基官能性有機聚矽氧烷，藉由使用(B)成分，可得到良好特性的交聯性有機聚矽氧烷組成物。 [0032] 本組成物之黏度的較佳範圍，與(B)成分之黏度的較佳範圍相同。本組成物，可藉由加熱而迅速地進行交聯，可形成無表面黏滯且具有充分的可撓性之硬化物，且較佳可形成較硬的硬化物。 本組成物，可在藉由加熱而完全硬化時，因應用途而形成為尤佳的硬度，尤其亦可得到高硬度。本發明之交聯性有機聚矽氧烷組成物，在以150℃加熱3小時時，以JIS K 6253所規定之型式D橡膠硬度較佳為45以上，因應期望的用途，可將型式D橡膠硬度設為45～60，此外，因應其他期望的用途，可將型式D橡膠硬度設為60～80。相反的，在欲得到橡膠狀的硬化物時，本組成物，可在藉由加熱而完全硬化時，將以JIS K 6253所規定之型式A橡膠硬度設為30～60，此外，因應其他期望的用途，可將型式A橡膠硬度設為60～90。 本組成物，可形成不會因加熱而使機械物性、硬度等產生變化之穩定的硬化物。加熱溫度，較佳係在80℃～200℃的範圍內進行。此外，本組成物並不受限於成型方法，可藉由通常的混合及烤爐的加熱等而使用作為接著劑用途、膜形成、灌封劑、塗佈劑、及底部填充劑。尤其由於為高折射率且光穿透率高，所以適合於光學用途的透鏡材料，LED等之半導體元件的灌封劑、塗佈劑、保護材料等用途。 [0033] 接著詳細說明本發明之硬化物。 本發明之硬化物，其特徵係使上述交聯性有機聚矽氧烷組成物硬化而成。硬化物的形狀並無特別限定，例如涵蓋塊狀、膜片狀、膜狀等之各式各樣者。硬化物，係能夠以單體來處理，或是以被覆或密封光半導體元件等之狀態來處理。 [實施例] [0034] 藉由實施例來詳細說明本發明之交聯性有機聚矽氧烷組成物。尚且，黏度為於25℃時之值。此外，式中的Me、Ph、Vi、及BPP分別表示甲基、苯基、乙烯基、及聯苯基。尚且，藉由於JIS K 6253「加硫橡膠及熱塑性橡膠的硬度試驗方法」既定的型式A及型式D橡膠硬度計來測定硬化物的硬度。JIS為Japanese Industrial Standards的略稱。再者，硬化物的折射率，係使用Metricon公司製、稜鏡耦合器 Model 2010，以波長550nm的雷射來測定。 [0035] [實施例1] 將以平均單位式：(MeViSiO2/2
)0.3
(Ph2
SiO2/2
)0.25
(BPPSiO3/2
)0.25
(PhSiO3/2
)0.2
所表示之分枝狀甲基乙烯基聯苯基苯基聚矽氧烷62重量份、以式： (ViMe2
SiO(SiPhMeO)15
)3
SiPh所表示之黏度於25℃時為1200mPa‧s之分枝狀甲基乙烯基苯基聚矽氧烷17重量份、及以式：(HMe2
SiO)2
SiPh2
所表示之三矽氧烷21重量份均一地混合後，以使鉑量以重量單位計成為5ppm之量，將鉑的1,3-二乙烯基-1,1,3,3-四甲基二矽氧烷錯合物混合於本組成物，而調製出25℃的黏度為6000mPa‧s之交聯性有機聚矽氧烷組成物。 [0036] 實施例1中所得到之組成物，在加熱至150℃時，於3小時完成硬化，而得到於25℃時型式D橡膠硬度80之硬化物。無表面黏滯，且即使於之後的加熱中，亦未引起硬度變化。所得到之硬化物的折射率為1.6024，可得到高折射率。 [0037] [實施例2] 將以平均單位式：(MeViSiO2/2
)0.3
(PhBPPSiO2/2
)0.25
(PhSiO3/2
)0.45
所表示之分枝狀甲基乙烯基聯苯基苯基聚矽氧烷62重量份、以式：(ViMe2
SiO(SiPhMeO)15
)3
SiPh所表示之黏度於25℃時為6000mPa‧s之分枝狀甲基乙烯基苯基聚矽氧烷17重量份、及以式：(HMe2
SiO)2
SiPh2
所表示之三矽氧烷21重量份均一地混合後，以使鉑量以重量單位計成為5ppm之量，將鉑的1,3-二乙烯基-1,1,3,3-四甲基二矽氧烷錯合物混合於本組成物，而調製出25℃的黏度為15000mPa‧s之交聯性有機聚矽氧烷組成物。 [0038] 實施例2中所得到之組成物，在加熱至150℃時，於3小時完成硬化，而得到於25℃時型式D橡膠硬度80之硬化物。無表面黏滯，且即使於之後的加熱中，亦未引起硬度變化。所得到之硬化物的折射率為1.5901，可得到高折射率。 [0039] [比較例1] 將以平均單位式：(MeViSiO2/2
)0.3
(Ph2
SiO2/2
)0.25
(PhSiO3/2
)0.45
所表示之分枝狀甲基乙烯基苯基聚矽氧烷62重量份、以式：(ViMe2
SiO(SiPhMeO)15
)3
SiPh所表示之黏度於25℃時為1200mPa‧s之分枝狀甲基乙烯基苯基聚矽氧烷17重量份、及以式：(HMe2
SiO)2
SiPh2
所表示之三矽氧烷21重量份均一地混合後，以使鉑量以重量單位計成為5ppm之量，將鉑的1,3-二乙烯基-1,1,3,3-四甲基二矽氧烷錯合物混合於本組成物，而調製出25℃的黏度為8000mPa‧s之交聯性有機聚矽氧烷組成物。 [0040] 比較例1中所得到之組成物，在加熱至150℃時，於3小時完成硬化，而得到於25℃時型式D橡膠硬度30之硬化物。無表面黏滯，且即使於之後的加熱中，亦未引起硬度變化。所得到之硬化物的折射率為1.5681。 [0041] [比較例2] 將以平均單位式：(MeViSiO2/2
)0.25
(Ph2
SiO2/2
)0.3
(PhSiO3/2
)0.45
所表示之分枝狀甲基乙烯基苯基聚矽氧烷63重量份、以式：ViMe2
SiO(PhMeSiO)38
)SiMe2
Vi所表示之直鏈狀有機聚矽氧烷(不具有以一般式(1)所表示之矽氧烷單位)17重量份、及以式：(HMe2
SiO)2
SiPh2
所表示之三矽氧烷20重量份均一地混合後，以使鉑量以重量單位計成為25ppm之量，將鉑的1,3-二乙烯基-1,1,3,3-四甲基二矽氧烷錯合物混合於本組成物，而調製出25℃的黏度為2500mPa‧s之交聯性有機聚矽氧烷組成物。 [0042] 比較例2中所得到之組成物，在加熱至150℃時，於3小時完成硬化，而得到於25℃時型式D橡膠硬度40之硬化物。無表面黏滯，且即使於之後的加熱中，亦未引起硬度變化。所得到之硬化物的折射率為1.5580。 [0043] (硫化耐性試驗) 於具備銀鍍覆電極及LED元件之LED基板上，塗佈實施例1及實施例2以及比較例1及比較例2中所得到之組成物，於烤爐中以150℃加熱3小時，而製作藉由該組成物的硬化物密封有LED元件之LED裝置。將所製作之LED裝置，於硫環境下放入80℃的烤爐，24小時後，以顯微鏡來觀察銀鍍覆電極。將在銀鍍覆電極未觀察到變色時判定為「○」，將銀鍍覆電極變化為黑色時判定為「×」，該結果如第1表所示。 [0044] (切割試驗) 於玻璃基材上，將實施例1及實施例2以及比較例1及比較例2中所得到之組成物塗佈成0.5mm、1.0mm、2.0mm及3.0mm的膜厚，於烤爐中以150℃加熱3小時使該組成物硬化後，使用切割刀與玻璃基材一同切斷。將在硬化物未產生龜裂等且能夠切斷玻璃基材時判定為「○」，將在硬化物產生龜裂等且無法切斷玻璃基材時判定為「×」，該結果如第1表所示。[產業上之可應用性] [0045] 本發明之交聯性有機聚矽氧烷組成物，由於交聯快，無硬化物的表面黏滯，且具有充分的可撓性，所以可構成為緩和應力之材料，而能夠使用作為電氣及電子用的接著劑、灌封劑、保護塗佈劑、底部填充劑。尤其當該組成物的硬化物為高折射率且光穿透率高之材料時，可較佳地適用在光學用途的透鏡材料，或是半導體元件的灌封劑、塗佈劑、保護材料等用途。此外，該組成物的硬化物，由於耐腐蝕氣體性優異，所以特別適合於在戶外或容易受到排氣的影響之環境中所使用之LED裝置。[0017] First, the cross-linkable organopolysiloxane composition of the present invention will be described in detail. The component (A) is an important component that controls the physical properties of the cross-linked organopolysiloxane composition in combination with the component (B), and the average unit formula is: (R 1 3 SiO 1/2 ) a (R 1 2 SiO 2/2 ) b (R 1 SiO 3/2 ) c (SiO 4/2 ) d (R 2 O 1/2 ) e represents an alkenyl functional moiety containing an aryl group containing at least one biphenyl group Dendritic organopolysiloxanes. The present inventors have found that corrosion resistance, refractive index, and cutting properties can be improved by making the component (A) contain an aryl group containing at least one biphenyl group. In the formula, R 1 is a monovalent hydrocarbon group with 1 to 14 carbon atoms, and in this monovalent hydrocarbon group, at least one is an alkenyl group with 2 to 6 carbon atoms and at least one is an aryl group, and the aryl group Among them, at least one of them is a biphenyl group. The plurality of R 1s may be the same or different from each other. Examples of monovalent hydrocarbon groups include an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an aryl group having 6 to 14 carbon atoms, and the like, and an alkyl group having 1 to 6 carbon atoms can be exemplified. Examples include methyl, ethyl, propyl, butyl, pentyl, hexyl, etc., preferably methyl and ethyl. Further, the aryl group having 6 to 14 carbon atoms includes, in addition to a biphenyl group as an essential component, a substituted or unsubstituted phenyl group, a naphthyl group, and an anthracenyl group. Examples of the alkenyl group having 2 to 6 carbon atoms include vinyl, allyl, butenyl, pentenyl, and hexenyl. In the formula, R 2 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and examples thereof include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, and the like, and a methyl group and an ethyl group are preferred. The plurality of R 2 may be the same or different from each other. In addition, in the formula, a represents the number showing the ratio of the siloxane unit represented by the general formula: R 1 3 SiO 1/2 , to satisfy 0≦a≦0.1, preferably 0≦a≦ The number of 0.08. This is because when a exceeds the upper limit of the above-mentioned range, the fluidity becomes too high, and the obtained cured product (in this specification, the cured product and the cross-linked product are synonymous) cannot obtain a sufficient balance between strength and hardness at room temperature. Therefore. b represents a number showing the ratio of the siloxane unit represented by the general formula: R 1 2 SiO 2/2 , and is a number satisfying 0.2≦b≦0.9, preferably 0.3≦b≦0.7. This is because when b is less than the lower limit of the above range, the refractive index cannot be preferably a high refractive index, and when the upper limit of the above range is exceeded, the obtained cured product cannot obtain sufficient hardness at room temperature. In addition, in the formula, c represents a number showing the ratio of the siloxane unit represented by the general formula: R 1 SiO 3/2 , and is a number satisfying 0.1≦c≦0.6, preferably 0.2≦c≦0.6. This is because when c is less than the lower limit of the above range, the obtained cured product cannot obtain sufficient hardness at room temperature, and on the other hand, when c exceeds the upper limit of the above range, the flexibility of the obtained cured product becomes poor. due to insufficient availability. In addition, d represents a number showing the ratio of the siloxane unit represented by the general formula: SiO 4/2 , and is a number satisfying 0≦d≦0.2, preferably 0≦a≦0.1. This is because when d exceeds the upper limit of the above-mentioned range, the flexibility of the obtained cured product becomes insufficient. In addition, e represents the number showing the ratio of the terminal of the branched organosiloxane represented by the general formula: R 2 O 1/2 , and is a number satisfying 0≦e≦0.1. This is because when e exceeds the upper limit of the above-mentioned range, the obtained cured product cannot obtain sufficient hardness at room temperature. In addition, in the formula, the sum of a, b, c, d, and e is 1. When a, d, and e each represent 0, the component (A) is represented by an average unit formula: (R 1 2 SiO 2/2 ) b (R 1 SiO 3/2 ) c . Component (B) is the second component that is combined with component (A) to control the physical properties of the cross-linked organopolysiloxane composition, and has at least two alkenyl groups and at least one alkenyl group in one molecule. Aryl group, and has at least 3 terminal siloxane units of polysiloxane represented by general formula (1): R 3 3 SiO 1/2 in one molecule, and has a viscosity of 20Pa at 25℃. Alkenyl-functional branched organopolysiloxane containing aryl groups with flowability below s. The component (B) preferably has fluidity with a viscosity of 20 Pa·s or less at 25°C. In the formula, R 3 represents a substituted or unsubstituted monovalent hydrocarbon group. Examples of monovalent hydrocarbon groups include an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an aryl group having 6 to 14 carbon atoms, and the like, and an alkyl group having 1 to 6 carbon atoms can be exemplified. Examples include methyl, ethyl, propyl, butyl, pentyl, hexyl, etc., preferably methyl and ethyl. Further, as the aryl group having 6 to 14 carbon atoms, a substituted or unsubstituted biphenyl group, a phenyl group, a naphthyl group, and an anthracenyl group can be exemplified. Examples of the alkenyl group having 2 to 6 carbon atoms include vinyl, allyl, butenyl, pentenyl, and hexenyl. The plurality of R 3 may be the same or different from each other. The branched organopolysiloxane can also be constituted by having at least 3 terminal siloxane units of the polysiloxane represented by the general formula: R 3 3 SiO 1/2 in one molecule. A fluid polysiloxane with a viscosity of 100 Pa·s (ie 100,000 m Pa·s) or less at 25°C. In addition, by controlling the manufacturing method of the component (B), the molecular weight of the three-dimensional alkenyl-functional branched organopolysiloxane can be controlled within a preferred range, and the structure is preferably configured to have a viscosity at 25° C. Flowability polysiloxane below the range. Due to this branched structure and fluidity at 25°C, a composition with a fast hardening speed and no surface stickiness of hardened material can be obtained. Furthermore, when the viscosity is 100 Pa·s at 25°C, it is clear to the trader that it has fluidity at 25°C. As described above, the viscosity of the component (B) at 25°C is preferably 50,000 mPa·s or less, more preferably 30,000 mPa·s or less, and particularly preferably 20,000 mPa·s or less. Such (B) component can be illustrated in average unit formula: (R 4 3 SiO 1/2 ) f (R 4 2 SiO 2/2 ) g (R 4 SiO 3/2 ) h (SiO 4 /2 ) The aryl-containing alkenyl-functional branched organopolysiloxane represented by i . Here, R 4 is a monovalent hydrocarbon group having 1 to 14 carbon atoms, and among the monovalent hydrocarbon groups, at least two are alkenyl groups having 2 to 6 carbon atoms and at least one is an aryl group. Examples of monovalent hydrocarbon groups include an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an aryl group having 6 to 14 carbon atoms, and the like, and an alkyl group having 1 to 6 carbon atoms can be exemplified. Examples include methyl, ethyl, propyl, butyl, pentyl, hexyl, etc., preferably methyl and ethyl. Further, as the aryl group having 6 to 14 carbon atoms, a substituted or unsubstituted biphenyl group, a phenyl group, a naphthyl group, and an anthracenyl group can be exemplified. Examples of the alkenyl group having 2 to 6 carbon atoms include vinyl, allyl, butenyl, pentenyl, and hexenyl. The plurality of R 4 may be the same or different from each other. In the formula, f, g, h, i satisfy 0<f≦0.8, 0≦g≦0.96, 0<(h+i), 0.5≦f/(h+i)≦4, and f+g+h The number of +i=1. Here, f is the number that defines the amount of terminal siloxane units of polysiloxane represented by the general formula: R 4 3 SiO 1/2 for obtaining a fluidity of 20 Pa·s or less at 25°C, h and i are the numbers of components prescribed to make the organopolysiloxane take a branched structure, and either one of f and h+i must be a number greater than 0. In addition, in order to obtain the fluidity of 20 Pa·s or less at 25°C, the ratio of the amount of the terminal siloxane unit of the polysiloxane represented by the general formula: R 3 3 SiO 1/2 relative to the branch point f/(h+i) must be 0.5 or more, and the maximum value is 4. The linear component represented by the general formula: R 4 2 SiO 2/2 is not necessarily an essential component, but in order to obtain the necessary viscosity, it can be introduced as a component in the polymer, and it can be 0≦g≦0.96 The range is preferably 0≦g≦0.90. The component (B) may preferably have an average composition formula: (R 4 3 SiO(R 4 2 SiO) m ) e Si R 4 (4-e) (in the formula, R 4 has 1 to 14 carbon atoms) In the monovalent hydrocarbon group, at least two of them are alkenyl groups with 2 to 6 carbon atoms and at least one is an aryl group, m represents an integer from 0 to 200, and e represents 3 or 4). An aspect of an aryl-containing alkenyl-functional branched organopolysiloxane. In the formula, m represents the number of linear siloxane units, and is an integer satisfying 0≦m≦200, preferably 0≦m≦100. In the formula, e represents 3 or 4, and is a number specifying the structure of the branch point for forming the branched organopolysiloxane. When e is 3, it becomes a T-shaped branch point, and when e is 4, it becomes Cross-shaped branch points. In addition, the example of (B) component, can enumerate: make with formula: R 5 R 6 2 SiO (R 6 2 SiO) n SiR 5 R 6 2 represented by the straight chain containing aryl and alkenyl Organopolysiloxane, which is represented by the formula: (HR 7 2 SiO) j SiR 7 (4-j) (R 7 is a monovalent hydrocarbon group with 1 to 14 carbon atoms, and j represents 3 or 4) containing A siloxane oligomer bound with a hydrogen atom of a silicon atom is formed by a hydrosilylation reaction, and one molecule of the resultant has at least 3 alkenyl groups, and there is no hydrogen atom bound to a silicon atom. Alkenyl-functional branched organopolysiloxanes. In the formula, R 5 represents an alkenyl group having 2 to 6 carbon atoms, and examples thereof include vinyl, allyl, butenyl, pentenyl, and hexenyl, and R 6 represents at least one carbon atom that is an aryl group. A monovalent hydrocarbon group having 1 to 14 carbon atoms, the monovalent hydrocarbon group can be exemplified by an alkyl group having 1 to 6 carbon atoms, an aryl group having 6 to 14 carbon atoms, and the like, and an alkyl group having 1 to 6 carbon atoms can be exemplified Examples include methyl, ethyl, propyl, butyl, pentyl, hexyl, etc., preferably methyl and ethyl. Further, as the aryl group having 6 to 14 carbon atoms, a substituted or unsubstituted phenyl group, a biphenyl group, a naphthyl group, and an anthracenyl group can be exemplified. A plurality of R 5 , R 6 and R 7 may be the same or different from each other, respectively. In the formula, n represents the number of linear siloxane units, and is an integer satisfying 0≦n≦200, preferably 0≦n≦100. This is because when n exceeds the upper limit of the above range, the viscosity of the obtained branched organopolysiloxane exceeds 25 Pa·s at 25°C. In the formula, R 7 represents a monovalent hydrocarbon group with 1 to 14 carbon atoms that does not contain an alkenyl group, and can be exemplified by methyl, ethyl, propyl, butyl, pentyl, hexyl, or a substituted or unsubstituted combination. Aryl groups such as phenyl, phenyl, naphthyl, anthracenyl, etc. In addition, in the formula, j represents 3 or 4, which is a number specifying the structure of the branch point for forming the branched organopolysiloxane, when j is 3, it becomes a T-shaped branch point, and when j is 4 , which becomes a cross-shaped branch point. In order to exert the effect of the present invention, the mixing ratio of (A) component and (B) component is 1/100 to 100/1 in terms of the weight ratio of A/B, preferably 1/50 to 50/1 , preferably 1/20 to 20/1. In the examples, the amounts of the (A) component and the (B) component are described in parts by weight, but it is clear to the trader that the mixing ratio of the (A) component and the (B) component in this specification is the weight ratio. To represent. (C) component is the crosslinking agent of the crosslinkable organopolysiloxane composition of the present invention (hereinafter also referred to as the composition), in order to have at least 2 bonded silicon atoms in one molecule An organopolysiloxane in which 12-70 mol% of the organic groups bonded with silicon atoms are aryl groups. In the component (C), there are at least two hydrogen atoms bonded to silicon atoms. This is because when the number of hydrogen atoms bonded to silicon atoms is less than two in one molecule, the resulting cured product cannot obtain sufficient mechanical strength at room temperature. The organic group in which the silicon atom is bonded in the component (C) is exemplified by alkyl groups such as methyl, ethyl, propyl, butyl, pentyl, and hexyl, and cycloalkyl groups such as cyclopentyl and cyclohexyl. , Aryl of phenyl, tolyl, naphthyl, anthracenyl, biphenyl, etc. (C) Component, in which 12-70 mol% of the organic group to which the silicon atom is bonded is an aryl group. This is because when the content of the aryl group deviates from the above-mentioned range, the compatibility of the mixture of the (A) component and the (B) component deteriorates, the resulting cured product loses transparency, and the mechanical properties also deteriorate. A hydrogen atom bonded to a silicon atom is synonymous with Si-H. This (C) component can be illustrated by the general formula: (HR 8 2 SiO) 2 SiR 8 2 , (HR 8 2 SiO SiR 8 2 ) 2 O, (HR 8 2 SiO) 3 SiR 8 , ( A compound represented by (HR 8 2 SiO) 2 SiR 8 ) 2 O, and the like. In the formula, R 8 is a monovalent hydrocarbon group with 1 to 14 carbon atoms, at least one of the monovalent hydrocarbon groups is an aryl group, and the monovalent hydrocarbon group can be exemplified by an alkyl group with 1 to 6 carbon atoms, a carbon atom Examples of the aryl group having 6 to 14 and the like, and the alkyl group having 1 to 6 carbon atoms include methyl, ethyl, propyl, butyl, pentyl, hexyl and the like, and methyl and ethyl are preferred. Further, as the aryl group having 6 to 14 carbon atoms, a substituted or unsubstituted biphenyl group, a phenyl group, a naphthyl group, and an anthracenyl group can be exemplified. The plurality of R 8s may be the same or different from each other. Furthermore, in R 8 , the content of the aryl group is in the range of 12 to 70 mol %. In this composition, the content of (C) component is to make the hydrogen atom bonded with silicon atom in this component relative to the sum of alkenyl groups in (A) component and (B) component. The ratio is within the range of 0.5 to 2, preferably within the range of 0.5 to 1.5. This is because when the content of the component (C) is outside the above-mentioned range, the mechanical strength of the obtained cured product at room temperature is insufficient. Component (D) is a catalyst for a hydrosilylation reaction for promoting a hydrosilylation reaction between the alkenyl group of the component (A) and the alkenyl group of the component (B) and the hydrogen atom bonded to the silicon atom in the component (C) . As the component (D), a platinum-based catalyst, a rhodium-based catalyst, and a palladium-based catalyst can be exemplified, and a platinum-based catalyst is preferred from the viewpoint of remarkably promoting the crosslinking of the present composition. Especially from the perspective of catalyst activity, platinum-alkenylsiloxane complexes are preferred, and those with good stability of the complexes are preferred to have 1,3-divinyl-1,3-divinyl-1, 1,3,3-Tetramethyldisiloxane as a ligand of platinum complexes. In this composition, the content of (D) component, as long as it is to promote the hydrosilylation reaction between the alkenyl group of (A) component and (B) component and the hydrogen atom bonded with silicon atom in (C) component A sufficient amount may be sufficient and is not particularly limited. Preferably, the amount of the metal atom in the component (D) is within the range of 0.1 ppm to 100 ppm in terms of weight (usually synonymous with mass) relative to the present composition. This is because when the content of the component (D) is less than the lower limit of the above range, the resulting composition cannot be sufficiently cross-linked or cannot be cross-linked at a sufficient speed, and on the other hand, when the content exceeds the upper limit of the above range, There is a concern that problems such as coloring may occur in the obtained composition. [0029] This composition contains the above-mentioned (A) components to (D) components, but the purpose of arbitrarily changing the curing speed can also add a reaction inhibitor as other optional components. Reaction inhibitors, alkynols such as 2-methyl-3-buten-2-ol, 2-phenyl-3-buten-2-ol, and ethynylcyclohexanol, 1,3,5 , 7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane, benzotriazole, etc. Although content of these reaction inhibitors is not specifically limited, It is preferable to exist in the range of 1 ppm - 1000 ppm with respect to the weight of this composition. [0030] In addition, when the adhesion to the substrate is required according to the application, an adhesion promoter may be contained in the composition. This adhesion promoter can be listed as having a trialkoxysilyl group (such as trimethoxysilyl or triethoxysilyl), a silyl group, an epoxy group (such as 3-glycidoxypropyl group) in one molecule ), alkenyl (such as vinyl or allyl) organosilanes or organosiloxane oligomers, etc. Furthermore, this composition, without impairing the purpose of the present invention, can contain organopolysiloxanes, inorganic fillers (for example, other than the aforementioned (A) components to (C) components as other arbitrary components. Silicon dioxide, glass, alumina, zinc oxide, etc.), polymethacrylate resin and other organic resin fine powders, heat-resistant agents, dyes, pigments, phosphors, flame-retardant imparting agents, solvents, etc. The organopolysiloxanes other than the aforementioned (A) components to (C) components include linear alkenyl-functional organopolysiloxanes, but the crosslinkable organopolysiloxane composition of the present invention is not Alkenyl-functional linear organopolysiloxane. In the present invention, the straight-chain alkenyl-functional organopolysiloxane, which has been regarded as an essential component in the past, may not be used. By using the component (B), a cross-linkable organopolysiloxane composition with good properties can be obtained. thing. The preferable range of the viscosity of this composition is identical with the preferable range of the viscosity of (B) component. The composition can be rapidly cross-linked by heating, and can form a cured product with sufficient flexibility without surface sticking, and preferably a relatively hard cured product. When this composition is completely hardened by heating, it can have a particularly preferable hardness according to the application, and especially high hardness can be obtained. When the cross-linkable organopolysiloxane composition of the present invention is heated at 150° C. for 3 hours, the hardness of the type D rubber specified in JIS K 6253 is preferably 45 or more. According to the desired application, the type D rubber can be used. The hardness is set to 45 to 60, and in accordance with other desired applications, the hardness of the Type D rubber can be set to 60 to 80. Conversely, when a rubber-like hardened product is to be obtained, the composition can be completely hardened by heating, and the rubber hardness of type A specified in JIS K 6253 can be set to 30 to 60. In addition, in accordance with other requirements For applications, the rubber hardness of Type A can be set to 60-90. This composition can form a stable cured product that does not change mechanical properties, hardness, etc. by heating. The heating temperature is preferably carried out in the range of 80°C to 200°C. In addition, the present composition is not limited to the molding method, and can be used as an adhesive application, film formation, potting agent, coating agent, and underfill by ordinary mixing, heating in an oven, and the like. In particular, because of its high refractive index and high light transmittance, it is suitable for lens materials for optical applications, potting agents, coating agents, and protective materials for semiconductor elements such as LEDs. [0033] Next, the cured product of the present invention will be described in detail. The cured product of the present invention is characterized by curing the above-mentioned crosslinkable organopolysiloxane composition. The shape of the cured product is not particularly limited, and includes, for example, various shapes such as a block shape, a film shape, and a film shape. The cured product can be handled alone, or can be handled in a state of covering or sealing the photosemiconductor element. [Examples] [0034] The crosslinkable organopolysiloxane composition of the present invention will be described in detail by means of examples. Also, the viscosity is the value at 25°C. In addition, Me, Ph, Vi, and BPP in a formula represent a methyl group, a phenyl group, a vinyl group, and a biphenyl group, respectively. Furthermore, the hardness of the hardened product was measured by the type A and type D rubber durometers established in JIS K 6253 "hardness test method of vulcanized rubber and thermoplastic rubber". JIS is an abbreviation for Japanese Industrial Standards. In addition, the refractive index of the hardened|cured material was measured with the laser beam of wavelength 550nm using the Metricon company make, the horn coupler Model 2010. [Example 1] The branched shape represented by the average unit formula: (MeViSiO 2/2 ) 0.3 (Ph 2 SiO 2/2 ) 0.25 (BPPSiO 3/2 ) 0.25 (PhSiO 3/2 ) 0.2 62 parts by weight of methyl vinyl biphenyl phenyl polysiloxane, with the formula: (ViMe 2 SiO(SiPhMeO) 15 ) 3 SiPh branched methyl vinyl with a viscosity of 1200 mPa·s at 25°C 17 parts by weight of phenylpolysiloxane and 21 parts by weight of trisiloxane represented by the formula: (HMe 2 SiO) 2 SiPh 2 were uniformly mixed so that the amount of platinum was 5 ppm by weight. , the 1,3-divinyl-1,1,3,3-tetramethyldisiloxane complex of platinum is mixed into the composition to prepare a cross-linking compound with a viscosity of 6000mPa·s at 25℃ Sexual organopolysiloxane composition. [0036] The composition obtained in Example 1 was heated to 150°C, and was cured in 3 hours to obtain a hardened product of type D rubber hardness of 80 at 25°C. There is no surface sticking, and no change in hardness is caused even in subsequent heating. The refractive index of the obtained hardened|cured material was 1.6024, and a high refractive index was obtained. [Example 2] The branched methyl vinyl biphenyl phenyl group represented by the average unit formula: (MeViSiO 2/2 ) 0.3 (PhBPPSiO 2/2 ) 0.25 (PhSiO 3/2 ) 0.45 62 parts by weight of polysiloxane, with the formula: (ViMe 2 SiO(SiPhMeO) 15 ) 3 SiPh 17 weight parts of branched methylvinylphenyl polysiloxane whose viscosity is 6000 mPa·s at 25°C part and 21 parts by weight of trisiloxane represented by the formula: (HMe 2 SiO) 2 SiPh 2 were uniformly mixed, so that the amount of platinum was 5 ppm by weight, 1,3-bis The vinyl-1,1,3,3-tetramethyldisiloxane complex is mixed into the composition to prepare a cross-linkable organopolysiloxane composition with a viscosity of 15000 mPa·s at 25°C. [0038] The composition obtained in Example 2, when heated to 150° C., was cured in 3 hours to obtain a hardened product with a type D rubber hardness of 80 at 25° C. There is no surface sticking, and no change in hardness is caused even in subsequent heating. The refractive index of the obtained hardened|cured material was 1.5901, and a high refractive index was obtained. [Comparative Example 1] The branched methyl vinyl phenyl polymer represented by the average unit formula: (MeViSiO 2/2 ) 0.3 (Ph 2 SiO 2/2 ) 0.25 (PhSiO 3/2 ) 0.45 62 parts by weight of siloxane, 17 parts by weight of branched methylvinylphenyl polysiloxane whose viscosity represented by (ViMe 2 SiO(SiPhMeO) 15 ) 3 SiPh is 1200 mPa·s at 25°C , and 21 parts by weight of trisiloxane represented by the formula: (HMe 2 SiO) 2 SiPh 2 were uniformly mixed, so that the amount of platinum was 5 ppm by weight. A cross-linkable organopolysiloxane composition with a viscosity of 8000 mPa·s at 25° C. is prepared by mixing the base-1,1,3,3-tetramethyldisiloxane complex into the composition. [0040] The composition obtained in Comparative Example 1 was heated to 150° C., and was cured in 3 hours to obtain a hardened product of type D rubber hardness of 30 at 25° C. There is no surface sticking, and no change in hardness is caused even in subsequent heating. The refractive index of the obtained hardened|cured material was 1.5681. [Comparative Example 2] The branched methyl vinyl phenyl polymer represented by the average unit formula: (MeViSiO 2/2 ) 0.25 (Ph 2 SiO 2/2 ) 0.3 (PhSiO 3/2 ) 0.45 63 parts by weight of siloxane, linear organopolysiloxane represented by the formula: ViMe 2 SiO(PhMeSiO) 38 )SiMe 2 Vi (without the siloxane unit represented by the general formula (1)) 17 Parts by weight and 20 parts by weight of trisiloxane represented by the formula: (HMe 2 SiO) 2 SiPh 2 were uniformly mixed, and then 1,3- Divinyl-1,1,3,3-tetramethyldisiloxane complex is mixed with this composition to prepare a cross-linkable organopolysiloxane composition with a viscosity of 2500mPa·s at 25℃ . [0042] The composition obtained in Comparative Example 2 was heated to 150° C. and was cured in 3 hours to obtain a hardened product with a type D rubber hardness of 40 at 25° C. There is no surface sticking, and no change in hardness is caused even in subsequent heating. The refractive index of the obtained hardened|cured material was 1.5580. (Vulcanization resistance test) The composition obtained in Example 1 and Example 2 and Comparative Example 1 and Comparative Example 2 was coated on an LED substrate with silver-plated electrodes and LED elements, and placed in an oven. It heated at 150 degreeC for 3 hours, and produced the LED device which sealed the LED element by the hardened|cured material of this composition. The fabricated LED device was placed in an oven at 80° C. in a sulfur environment, and 24 hours later, the silver-plated electrode was observed with a microscope. When the silver-plated electrode was not observed to be discolored, it was judged as "○", and when the silver-plated electrode was changed to black, it was judged as "x", and the results are shown in Table 1. (Cut test) On the glass substrate, the compositions obtained in Example 1 and Example 2 and Comparative Example 1 and Comparative Example 2 were coated into 0.5mm, 1.0mm, 2.0mm and 3.0mm The film thickness was heated at 150° C. in an oven for 3 hours to harden the composition, and then cut together with the glass substrate using a dicing blade. When the cured product did not have cracks and the like and the glass substrate could be cut, it was judged as "○", and when the cured product had cracks and the like and the glass base material could not be cut as "x", the results were the same as the first shown in the table. [Industrial Applicability] [0045] The cross-linkable organopolysiloxane composition of the present invention can be configured as It is a stress-relaxing material and can be used as an electrical and electronic adhesive, potting agent, protective coating agent, and underfill. Especially when the hardened product of the composition is a material with high refractive index and high light transmittance, it can be preferably used as a lens material for optical applications, or as a potting agent, coating agent, protective material for semiconductor elements, etc. use. In addition, the cured product of the composition is excellent in corrosion gas resistance, so it is particularly suitable for LED devices used outdoors or in environments that are easily affected by exhaust gas.
