| 摘要 |
PURPOSE:To eliminate warpage and to decrease the pinholes to be generated in a recording layer by forming an org. synthetic resin coating layer of a mixture composed of a UV curing type resin contg. a photosensitizing agent and an epoxy resin without contg. a hardener. CONSTITUTION:This coating agent consists of the mixture composed of the UV curing type resin contg. the photosensitizing agent and the epoxy resin without contg. the hardener. The photosensitizing agent to be used may be exemplified by a benzophenone system, acetophenone system, anthraquinone system, oxime ester system, etc. The UV curing type resin may be any of an acrylic multifunctional compd., urethane modified multifunctional acryl system, epoxy modified multifunctional acryl system, polyester modified multifunctional acryl system, etc. The agent contains preferably no solvent and monomers and has the viscosity ranging 500-1,000cps/25 deg.C. Generation of the warpage is thereby obviated and the pinholes are less generated in the recording layer.
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