The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 17, 2012
Filed:
Aug. 20, 2008
Akira Esaki, Yokohama, JP;
Yuuki Ono, Yokohama, JP;
Yuuji Soejima, Yokkaichi, JP;
Kentarou Uchino, Yokkaichi, JP;
Makoto Terauchi, Yokkaichi, JP;
Takeshi Kuriwada, Minato-ku, JP;
Akira Esaki, Yokohama, JP;
Yuuki Ono, Yokohama, JP;
Yuuji Soejima, Yokkaichi, JP;
Kentarou Uchino, Yokkaichi, JP;
Makoto Terauchi, Yokkaichi, JP;
Takeshi Kuriwada, Minato-ku, JP;
Mitsubishi Kagaku Media Co., Ltd., Tokyo, JP;
Abstract
To provide an optical recording medium excellent in the balance of characteristics, which has a sufficient surface hardness and of which the deformation when the environmental temperature and the environmental humidity change is small. An optical recording medium comprising a resin substrate, a recording and reading layer, a cover coat layer which is a cured product of a radiation-curable composition containing a urethane (meth)acrylate (A) and a (meth)acrylate compound (B) other than the urethane (meth)acrylate (A), and a hard coat layer having a surface hardness of at least B in this order, wherein of the cover coat layer, the ratio of the elastic modulus in tension upon absorbing water to saturation to the elastic modulus in tension at 25° C. under a humidity of 45% is at least 0.20.