申请人:Loctite (R & D) Limited
公开号:EP1502922A1
公开(公告)日:2005-02-02
The present invention is directed to a photocurable composition for use as in particular an encapsulant, capable of curing at wavelengths greater than 290 nm. Reaction products of these photocurable compositions are opaque but good CTV is achieved. The composition is initially substantially transparent but becomes opaque on exposure to uv. The composition cures while the colour change takes place. In use, the photocurable composition may be applied, for instance, over the wire bonds that electrically connect a semiconductor device to a substrate to maintain a fixed positional relationship and protect the integrity of the electrical connection from vibrational and shock disturbances, as well as from interference from environmental contaminants.
本发明涉及一种光固化组合物,尤其是用作封装剂的光固化组合物,能够在波长大于 290 纳米的条件下固化。这些光固化组合物的反应产物是不透明的,但可实现良好的 CTV。组合物最初基本上是透明的,但在紫外线照射下会变得不透明。在颜色发生变化的同时,组合物也会固化。在使用中,可将光固化组合物涂在将半导体器件与基板电连接的导线键上,以保持固定的位置关系,并保护电连接的完整性免受振动和冲击干扰,以及环境污染物的干扰。