Stock material or miscellaneous articles – Layer or component removable to expose adhesive
Reexamination Certificate
2002-10-23
2004-12-28
Ahmad, Nasser (Department: 1772)
Stock material or miscellaneous articles
Layer or component removable to expose adhesive
C283S081000, C428S041600, C428S041700, C428S041900, C428S042100, C428S201000
Reexamination Certificate
active
06835430
ABSTRACT:
TECHNICAL FIELD
The present invention relates generally to a multilayered volume hologram structure comprising a transparent image bearing hologram, which is pasted on a surface of a photograph or personal information area attached to ID cards, exam cards, passports, etc. for the purpose of ensuring security and a label for making such a multilayered volume hologram structure, and more particularly to a multilayered volume hologram structure which cannot possibly be fraudulently altered or otherwise falsified, and a label for making such a multilayered volume hologram structure.
In recent years, means for preventing fraudulent alternation or falsification of identity cards, etc. have been strongly demanded, for instance, so as to certainly identify who carries an ID card as who is characterized by identifying data born thereon. Such falsification preventive techniques, for instance, are disclosed in JM-B 5-48215 and JP-A 5-201181 wherein an image bearing hologram is used. The image of the image bearing hologram has the same function as an engraving or the like on a conventional ID card or the like.
Especially according to the means disclosed in the latter publication, when the protective film is stripped off for the purpose of falsification or the like, the hologram layer fractures due to its softness to make it impossible to reconstruct the hologram image, thereby preventing falsification as by making a photograph replacement. When a rigid plastic film is used as the surface protective film, however, the hologram layer is often perfectly stripped off following the surface protective film. In this case, there is no sign of a photograph replacement or falsification of information. It is thus strongly demanded to improve this prior art means in such a way that the function of preventing falsification is much more improved for the purpose of ensuring security.
DISCLOSURE OF THE INVENTION
According to a first aspect of the invention, there is provided a multilayered volume hologram structure comprising a substrate for a certificate or the like, and a first adhesive layer, a volume hologram layer and a surface protective film laminated on said substrate in the described order, characterized in that a peel strength, with which a multilayer structure consisting of said volume hologram layer and said surface protective film is peeled from said substrate, is greater than a breaking strength or a tensile strength at 1% elongation of said multilayer structure consisting of said volume hologram layer and said surface protective film.
The multilayered volume hologram structure according to the first aspect of the invention is further characterized in that the peel strength, with which said multilayer structure consisting of said volume hologram layer and said surface protective film is peeled from said substrate (e.g., a photograph), is 0.1 Kg/25 mm to 5.0 Kg/25 mm, and a multilayer structure comprising said first adhesive layer, said volume hologram layer and said surface protective film laminated on said substrate in the described order has a breaking strength or a tensile strength at 1% elongation of 0.01 Kg/mm
2
to 5.0 Kg/mm
2
.
The multilayered volume hologram structure according to the first aspect of the invention is further characterized in that another adhesive layer is interleaved between said volume hologram layer and said surface protective film.
The multilayered volume hologram structure according to the first aspect of the invention is further characterized in that said surface protective film is subjected to a hard coat treatment on a surface thereof.
The multilayered volume hologram structure according to the first aspect of the invention is further characterized in that said surface protective film is subjected to a release treatment on a surface thereof.
The present invention also provides a label for making the multilayered volume hologram structure according to the first aspect of the invention, characterized by comprising a release paper and a first adhesive layer, a volume hologram layer and a surface protective film laminated on said release paper in the described order, said label being pasted on a substrate for a certificate or the like upon removal of said release paper.
The label for making the multilayered volume hologram structure according to the first aspect of the invention is further characterized in that a peel strength, with which a multilayer structure consisting of said volume hologram layer and said surface protective film is peeled from said substrate, is 0.1 Kg/25 mm to 5.0 Kg/25 mm, and a multilayer structure comprising said first adhesive layer, said volume hologram layer and said surface protective film laminated in the described order has a breaking strength or a tensile strength at 1% elongation of 0.01 Kg/mm
2
to 5.0 Kg/mm
2
.
The label for making the multilayered volume hologram structure according to the first aspect of the invention is further characterized in that said volume hologram layer and said surface protective film are laminated together with said first adhesive layer interleaved therebetween.
The volume hologram structure according to the first aspect of the invention ensures prevention of falsification because, immediately upon making a photograph replacement or falsification of the information area, the volume hologram image breaks down certainly. With the label for making the multilayered volume hologram structure according to the first aspect of the invention, it is easy to make the multilayered volume hologram structure according to the first aspect of the invention.
According to a second aspect of the invention, there is provided a multilayered volume hologram structure comprising a substrate, and a first adhesive layer, a volume hologram layer, a second adhesive layer and a surface protective film laminated on said substrate in the described order, characterized in that said second adhesive layer is weaker in adhesion than said first adhesive layer, and when said surface protective film is released from said multilayered volume hologram structure in a given releasing direction, a releasing line is produced in a direction at right angles with respect to said releasing direction.
According to the second aspect of the invention, there is also provided a multilayered volume hologram structure comprising a substrate, and a third adhesive layer, a colored sheet, a first adhesive layer, a volume hologram layer, a second adhesive layer and a surface protective film laminated on said substrate in the described order, characterized in that said second adhesive layer is weaker in adhesion than said first adhesive layer and said third adhesive layer, and when said surface protective film is released from said multilayered volume hologram structure in a given releasing direction, a releasing line is produced in a direction at right angles with respect to said release direction.
The second multilayered volume hologram structure of the invention is also characterized in that a peel strength, with which said surface protective film is released from said multilayered volume hologram structure, is 0.001 Kg/25 mm to 0.1 Kg/25 mm, and a peel strength between said substrate and said volume hologram layer is 0.1 Kg/25 mm to 5.0 Kg/25 mm.
The second multilayered volume hologram structure of the invention is further characterized in that said volume hologram layer is made up of a photosensitive material used for recording a dry type of volume phase hologram, which comprises a matrix polymer, a photopolymerizable compound, a photopolymerization initiator and a sensitizing dye.
One label for making the second multilayered volume hologram structure of the invention is a multilayered volume hologram structure comprising a release paper, and a first adhesive layer, a volume hologram layer, a second adhesive layer and a surface protective film laminated on said release paper in the described order, characterized in that said second adhesive layer is weaker in adhesion than said first adhesive layer, and when said surface protective film is released fr
Hamada Satoru
Morii Akio
Nishikawa Shingo
Ohtaki Hiroyuki
Ueda Kenji
Ahmad Nasser
Dai Nippon Printing Co. Ltd.
Dellett & Walters
LandOfFree
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