Composition for hard coat, surface protecting film, and optical disc
AssigneeSony Corporation
InventorsMasashi Enomoto, Rie Tsubo, Minoru Kikuchi, Kazuhiro Mori
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Abstract
The present invention realizes forming of a hard coat having excellent leveling without lowering physical properties. An information signal portion is formed on a substrate. A light transmitting sheet is bonded to the substrate with a bonding layer disposed therebetween to form a light transmitting layer. There is obtained a composition for hard coat by adding a low molecular-weight reactive diluent to a solvent-type hard coat agent. The composition for hard coat is coated on the light transmitting layer uniformly by a spin coating method. The coated composition for hard coat is cured to be a hard coat.
Claims36
A composition for hard coat, comprising a solvent-type hard coat agent and a low molecular-weight reactive diluent added to the hard coat agent.
A surface protecting film having a hard coat obtained by adding a low molecular-weight reactive diluent to a solvent-type hard coat agentand curing after coating.
An optical disc comprising:
- an information signal portion formed on one principal surface of a substrate;
- a protecting layer formed on said information signal portion;
- and
- a surface protecting film formed on at least one surface selected from said protecting layer and said substrate,
- wherein said surface protecting film has a hard coat obtained by adding a low molecular-weight reactive diluent to a solvent-type hard coat agent, and curing after coating.
Dependencies are inferred from the claim text.