The radiation sensitive layer is comprised of (1) a novolac resin,(2) a resole resin, (3) a latent braised acid, and (4 ) an infrared light absorber.

• 其热敏层的基本组成为:(1)线型酚醛树脂;(2)羟甲基酚醛树脂;(3)产酸源;(4)红外吸收染料。