Volume hologram laminate, and label for preparation of volume hologram laminate

• Main Authors: OTAKI, HIROYUKI, UEDA, KENJI
• Format: Patent
• Language: English; French; German
• Published: 30.07.2003
• Edition: 7
• Subjects: ADVERTISING; BOOK COVERS; BOOKBINDING; CINEMATOGRAPHY; CRYPTOGRAPHY; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDEDFOR; DISPLAY; DISPLAYING; EDUCATION; ELECTROGRAPHY; FILES; HOLOGRAPHIC PROCESSES OR APPARATUS; HOLOGRAPHY; LABELS OR NAME-PLATES; LOOSE LEAVES; MOVABLE-STRIP WRITING OR READING APPARATUS; PERFORMING OPERATIONS; PHOTOGRAPHY; PHYSICS; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITYFEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOTOTHERWISE PROVIDED FOR; SEALS; SIGNS; SPECIAL PRINTED MATTER; TRANSPORTING

There are provided a volume hologram laminate and a label for the preparation of a volume hologram laminate which, when kept in the pressed state, for example, during storage, is less likely to cause spotty hologram defects in the volume hologram layer. The volume hologram laminate comprises a substrate 2 and, stacked on the substrate 2 in the following order, a first pressure-sensitive adhesive layer 3, a volume hologram layer 5, a second pressure-sensitive adhesive layer 4, and a surface protective film 6, the volume hologram layer being such that a hologram has been recorded on a recording material comprising a matrix polymer and a photopolymerizable compound, the volume hologram layer having a glass transition point of 30 to 70 DEG C and a dynamic storage modulus of 5 x 10 Pa to 5 x 10 Pa as measured at a measuring frequency of 6.28 rad/sec and a temperature of 50 DEG C, the pressure-sensitive adhesive layer having a dynamic storage modulus of not less than 2.5 x 10 Pa as measured at a measuring frequency of 6.28 rad/sec and a temperature of 50 DEG C and a loss tangent (tan delta ) defined as dynamic loss modulus/dynamic storage modulus at 120 DEG C of not more than 0.15.