| 摘要 |
There are disclosed a releasing sheet which comprises a sheet like substrate and a cured layer placed thereon of an addition reaction type silicone composition containing a photosensitizer, characterized in that the cured layer is formed by heat treating a layer of an addition reaction type silicone composition containing at least one photosensitizer selected from the group consisting of alpha-hydroxy ketones (e.g. 2-hydroxy-2-methyl-1-phenylpropane-1-one, 1-[4-(2-hydroxyethoxy)-phenyl]-2-hydroxy-2-methylpropane-1-one and 1-hydroxycyclohexy-phenyl-ketone) and alpha-diketone dialkyl acetals (e.g. benzyldimethyl acetal), followed by treatment with ultraviolet ray irradiation; and a process for efficiently producing the releasing sheet in extremely high productivity. The layer of an addition reaction type silicone composition has favorable adhesiveness to the substrate and non-migration property, and thus the objective releasing sheet has excellent releasability and exceptionally high flatness.
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