# US 8,541,095 B2 · Security film and process for preparation thereof

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- Number: US 8,541,095 B2
- Document ID: US8541095B2
- Status: Granted
- Kind: B2
- Application number: 13/055,313
- Filed: 2008-07-29
- Published: 2011-12-01
- Granted: 2013-09-24
- Earliest claimed: 2008-07-24
- Assignees: Shanghai Techsun Anti-Counterfeiting Technology Holding Co., Ltd.
- Applicants: Liangheng Xu; Kai Yang
- Inventors: Liangheng Xu; Kai Yang
- Web page: https://patentgrep.com/patent/US8541095B2

## CPC

- C09D 7/61: inorganic
- B32B 27/08: of synthetic resin
- B42D 25/29: Securities; Bank notes
- B42D 25/465: using chemicals or adhesives
- B44F 1/10: Changing, amusing, or secret pictures
- C08K 9/02: Ingredients treated with inorganic substances
- C08L 1/08: Cellulose derivatives
- C09D 5/004: {Reflecting paints; Signal paints}
- C09D 5/29: for multicolour effects
- C09D 7/65: macromolecular (C09D7/41-C09D7/48 take precedence)
- C09D 7/70: {characterised by shape, e.g. fibres, flakes or microspheres}
- G02B 5/128: transparent spheres being embedded in matrix
- B42D 25/45: Associating two or more layers
- B42D 2033/18
- B42D 2033/20
- B42D 2033/24
- B42D 2033/30
- B42D 2035/24
- Y10T 428/24835: including developable image or soluble portion in coating or impregnation [e.g., safety paper, etc.]
- Y10T 428/2848: Three or more layers
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B42D: BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B44F: SPECIAL DESIGNS OR PICTURES
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Disclosed herein are an anti-counterfeiting film and process for preparation thereof. The anti-counterfeiting film comprises a directional retroreflective layer (1), an optical-angle-based color-changing information layer (2), a reflective layer (3) and a support layer (4) which are combined in this turn. The support layer (4) is made of a polymer resin material, the reflective layer (3) is made of a material with high reflectivity and has a thickness of nanoscale, the information layer (2) is made of an optical-angle-based color-changing chiral polymer material having a helical structure or made of an optical-angle-based color-changing cellulose material. The optical-angle-based color-changing chiral polymer material having a helical structure is a condensation product of a chiral compound and a compound with functional group. The optical-angle-based color-changing cellulose material is composed of a cellulose derivative and a polymerisable monomer. The directional retroreflective layer (1) is composed of spheres which are made of optical material, and is spherically embedded in the support layer (4), wherein the refractive index of the material for the directional retroreflective layer (1) is 1.9-1.93.

## Claims

### Claim 1

An anti-counterfeiting film, comprising a directional retroreflective layer, an optical-angle-based color-changing information layer, a reflective layer and a support layer:
the support layer is made of a polymer resin material;
the reflective layer is made of a material having a high reflectivity and a thickness on a nanoscale;
the optical-angle-based color-changing information layer is made of an optical-angle-based color-changing chiral polymer material having a helical structure or of an optical-angle-based color-changing cellulose material, the optical-angle-based color-changing chiral polymer material having a helical structure is a condensation product of a chiral compound and a compound with a functional group;
the optical-angle-based color-changing cellulose material is composed of a cellulose derivative and a polymerisable monomer;
the directional retroreflective layer is composed of spheres which are made of optical material, and, the directional retroreflective layer is spherically embedded in the support layer; and
the refractive index of the material for the directional retroreflective layer is 1.9-1.93.

### Claim 2 (depends on 1)

The anti-counterfeiting film according to claim 1, wherein the polymer resin material for the support layer is selected from the group consisting of polyurethane, phenolic resin and polyacrylic acid resin.

### Claim 3 (depends on 1)

The anti-counterfeiting film according to claim 1, wherein the reflective layer is selected from the group consisting of ZnO, SnO, ZnS and TiO2.

### Claim 4 (depends on 1)

The anti-counterfeiting film according to claim 1, wherein the chiral compound is selected from the group consisting of isosorbide, D-camphoric acid, 2,3-dihydroxy butane and 3-methyl adipic acid;
the compound with a functional group is selected from the group consisting of hydroquinone, triglycol, p-hydroxybenzoic acid, ethylene glycol, oxalic acid, terephthalic acid, phenol, fatty acid and formaldehyde;
the cellulose derivative has the following structural formula:
wherein, Cell is cellulose, R is C1-C20 alkyl or derivatives of phenyl;
the polymerisable monomer is selected from the group consisting of acrylate, methacrylate, vinyl ether, epoxy resin and cis-butyl diacid ester.

### Claim 5

A process for preparation of the anti-counterfeiting film comprising the following steps:
coating a release material having adhesion force over a base film, implanting material for a directional retroreflective layer onto the release layer, followed by drying; and
coating or printing an optical-angle-based color-changing information layer over the directional retroreflective layer, then vapor depositing material for a reflective layer in a high vacuum, and coating material for a support layer over the reflective layer, followed by drying, then removing the base film and release layer to obtain the anti-counterfeiting film.

### Claim 6 (depends on 5)

The process of claim 5, wherein the coating step uses a technology selected from the group consisting of mesh coating, heat melting coating and blade coating is used for the coating.

### Claim 7 (depends on 5)

The process of claim 5, wherein the base film is selected from a transparent polymeric polyester film material.

### Claim 8 (depends on 7)

The process of claim 7, wherein the base film is selected from the group consisting of polyethylene terephthalate, polycarbonate, polystyrene and polyvinyl chloride.

### Claim 9 (depends on 5)

The process of claim 5, wherein the release material is liquid paraffin.

### Claim 10 (depends on 5)

The process of claim 5, wherein the printing step uses a technology selected from the group consisting of gravure printing, flexographic printing and screen printing is used for the printing.