A curable composition includes a condensation product having a weight average molecular weight of 30,000 or less and a curing agent, the condensation product being obtained by hydrolysis and condensation of a first and second silane compound in the presence of a neutral salt catalyst. The condensation product also has a ratio Y/X of 0.2 or less, wherein X is the number of moles of an OR3 group directly bonded to silicon atoms of the first and second silane compounds, and Y is the number of moles of an OR3 group directly bonded to a silicon atom of the condensation product. The first silane compound is represented by R1—(SiR2a(OR3)3-a), and the second silane compound is represented by R4—(SiR2a(OR3)3-a).
一种可固化组合物包括一种重量平均分子量为 30,000 或更小的缩合产物和一种固化剂,该缩合产物是由第一和第二
硅烷化合物在中性盐催化剂存在下
水解和缩合得到的。缩合产物的比率 Y/X 也为 0.2 或以下,其中 X 是直接键合到第一和第二
硅烷化合物
硅原子上的 OR3 基团的摩尔数,Y 是直接键合到缩合产物
硅原子上的 OR3 基团的摩尔数。第一
硅烷化合物用 R1-(SiR2a(OR3)3-a)表示,第二
硅烷化合物用 R4-(SiR2a(OR3)3-a)表示。