PURPOSE: To prevent thermal sagging by using a (meth)allyl (meth)acrylate as an essential component of a raw material for a substrate resin and crosslinking and polymerizing the same with a (meth)acrylate.
CONSTITUTION: The substrate resin is constituted of the resin formed by using the (meth)allyl (meth)acrylate as the essential component of the raw material and crosslinking and polymerizing the same with the (meth)acrylate. The chemical formula of the (meth)alloy (meth)acrylate is expressed by formula. The proportion at which the (meth)allyl (meth)acrylate occupies in the compd. is not particularly limited and is preferably ≥50wt% by the total weight of the (meth)allyl (meth)acrylate and (meth)acrylate in terms of thermal deformation resistance. The (meth)allyl (meth)acrylate is more preferably compounded at ≥70wt%. The optical disk having the thermal sagging resistance and excellent optical characteristics is thus obtd.
IKENO SHINOBU
USUI HIROAKI
NAKAMURA MASASHI
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