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US 6,805,934 B2Granted
Volume hologram laminate
AssigneeDai Nippon Printing Co., Ltd.
InventorsHiroyuki Ohtaki, Kenji Ueda
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AssigneeDai Nippon Printing Co., Ltd.
InventorsHiroyuki Ohtaki, Kenji Ueda
Estimating the term…
The present invention relates to a volume hologram laminate with low generation of spotty hologram flaws in the volume hologram layer even when kept under pressurized conditions during storage, and to a volume hologram laminate-fabricating label. The volume hologram laminate 1 of the invention has a first adhesive layer 3, a volume hologram layer 5, a second adhesive layer 4 and a surface protective film 6 formed in that order on a substrate 1, wherein the volume hologram layer is a hologram recording in a recording material comprising a matrix polymer and a photopolymerizable compound, having a glass transition point of 30° C.-70° C. and a dynamic storage elastic modulus of 5×105 Pa-5×107 Pa at 50° C. when measured at 6.28 rad/s, and the second adhesive layer has a dynamic storage elastic modulus of no greater than 5×104 Pa or at least 2.5×105 Pa at 50° C. when measured at 6.28 rad/s.
A volume hologram laminate having a first adhesive layer, a volume hologram layer, a second adhesive layer and a surface protective film formed in that order on a substrate, wherein said volume hologram layer is a hologram recording in a recording material comprising a matrix polymer and a photopolymerizable compound, having a glass transition point of 30° C.-70° C. and a dynamic storage elastic modulus of 5×105 Pa-5 ×107 Pa at 50° C. when measured at 6.28 rad/s, and said second adhesive layer has a loss tangent delta (tan δ), as represented by the dynamic loss elastic modulus/dynamic storage elastic modulus for the frequency dependent property at 10−1 rad/s-10 rad/s that increases with lower frequency.
A volume hologram laminate-fabricating label wherein a first adhesive layer, a volume hologram layer, a second adhesive layer and a surface protective film are formed in that order on a peel sheet, said volume hologram layer is a hologram recording in a recording material comprising a matrix polymer and a photopolymerizable compound, having a glass transition point of 30° C.-70° C. and a dynamic storage elastic modulus of 5×105 Pa-5×107 Pa at 50° C. when measured at 6.28 rad/s, and said second adhesive layer has a loss tangent delta (tan δ), as represented by the dynamic loss elastic modulus/dynamic storage elastic modulus for the frequency dependent property at 10−1 rad/s-10 rad/s, that increases with lower frequency.
Dependencies are inferred from the claim text.