Title:
SHIELDING MATERIAL
Document Type and Number:
Japanese Patent JP2011107181
Kind Code:
A
Abstract:
To provide a hologram recording medium having a long period to the expiration date (a long shelf life) in a non-recording state by using a sheet formed of a polyethylene terephthalate resin having a low oxygen permeability and superior chemical resistance as a shielding material of the hologram recording medium.
The shielding material for a hologram recording medium is formed of a polyethylene terephthalate resin having an oxygen permeability of not more than 80 (cm3 100 μm/m2/24hr/atm) at 30°C and a limiting viscosity of 0.4 to 1.2 dl/cm3 measured in o-chlorophenol at 35°C.
Inventors:
TSUNEMORI HIDEYUKI
Application Number:
JP2009258901A
Publication Date:
June 02, 2011
Filing Date:
November 12, 2009
Export Citation:
Assignee:
TEIJIN CHEMICALS LTD
International Classes:
G03H1/02; G03H1/26; G11B7/24; G11B7/24015; G11B7/24035; G11B7/24044; G11B7/24073; G11B7/24085; G11B7/24091; G11B7/254; G11B7/257
Attorney, Agent or Firm:
Hideko Mihara