Polycarbonate-based security documents and/or documents of value with a hologram in the card body
US-2015220056-A1 · Aug 6, 2015 · US
Volume hologram sheet to be embedded, forgery prevention paper, and card
US11597230B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11597230-B2 |
| Application number | US-202117372944-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jul 12, 2021 |
| Priority date | Jan 19, 2010 |
| Publication date | Mar 7, 2023 |
| Grant date | Mar 7, 2023 |
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- Title
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Abstract
Official abstract text for this publication.
An object of the present invention is to provide a thin volume hologram sheet to be embedded sufficiently resistant to a mechanical stress such as a stress including a tensile stress, a shear stress and a compression stress at the time of processing even under a heating condition, a forgery prevention paper and a card using the same. The object is achieved by providing a volume hologram sheet to be embedded comprising a volume hologram layer, and a substrate disposed only on one side surface of the volume hologram layer using an adhesion means, wherein a peeling strength of the volume hologram layer and the substrate is 25 gf/25 mm or more.
First claim
Opening claim text (preview).
What is claimed is: 1. A card comprising a core sheet, a volume hologram sheet, and an over sheet, wherein the volume hologram sheet is embedded between the core sheet and the over sheet, the volume hologram sheet includes a volume hologram layer, a substrate, and an adhesion means, a peeling strength of the volume hologram layer and the substrate is 144 gf/25 mm or more, the adhesion means is an adhesive layer using a solvent-based thermosetting adhesive, and the adhesive layer is laminated between a first surface of the volume hologram layer and the substrate, wherein the volume hologram layer comprises epoxy group—containing acrylic resin, polyvinyl acetate, 1,6-hexane diol diglycidyl ether, diphenoxy ethanol fluoride diacrylate, diaryl iodonium salt, and 2,5-bis(4-diethyl amino benzylidene) cyclopentanone. 2. The card according to claim 1 , wherein the peeling strength is measured based on the 180-degree peeling test. 3. The card according to claim 1 , wherein the core sheet and the over sheet are made from similar materials. 4. The card according to claim 1 , wherein a main component of a resin material used in the volume hologram layer is an acrylic resin material, and the substrate includes a polyester resin. 5. The card according to claim 1 , wherein the over sheet is transparent, and the core sheet is opaque.
Assignees
Inventors
Classifications
Operations & Transport · mapped topic
Cards, e.g. identity cards, credit cards · CPC title
Heat-activated · CPC title
Corona, ionisation, electrical discharge, plasma treatment · CPC title
Ribbons or strips (filaments D21H15/06) · CPC title
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Frequently asked questions
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- What does patent US11597230B2 cover?
- An object of the present invention is to provide a thin volume hologram sheet to be embedded sufficiently resistant to a mechanical stress such as a stress including a tensile stress, a shear stress and a compression stress at the time of processing even under a heating condition, a forgery prevention paper and a card using the same. The object is achieved by providing a volume hologram sheet t…
- Who is the assignee on this patent?
- Dainippon Printing Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification G03H1/0252. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Mar 07 2023 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).