# US 10,481,300 B2 · Mirror surface decorative sheet having crack elongation and specified surface roughness, and mirror surface decorative plate using same

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- Number: US 10,481,300 B2
- Document ID: US10481300B2
- Status: Granted
- Kind: B2
- Application number: 15/126,808
- Filed: 2015-03-19
- Published: 2018-05-10
- Granted: 2019-11-19
- Earliest claimed: 2014-03-19
- Assignees: Dai Nippon Printing Co., Ltd.
- Applicants: Dai Nippon Printing Co., Ltd.
- Inventors: Saori Miyazaki; Chigusa Kuriyama; Satoshi Furuta
- Web page: https://patentgrep.com/patent/US10481300B2

## CPC

- C08J 7/043: Improving the adhesiveness of the coatings per se, e.g. forming primers (adhesives in the form of films or foils characterised by the primer layers between the polymer carriers and the adhesives C09J7/50)
- B32B 7/00: Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B 7/022: Mechanical properties
- B32B 27/06: as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08)}
- B32B 27/08: of synthetic resin
- B32B 27/16: specially treated, e.g. irradiated
- B32B 27/28: comprising synthetic resins not wholly covered by any one of the sub-groups {B32B27/30 - B32B27/42}
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- C08J 7/0423: {with at least one layer of inorganic material and at least one layer of a composition containing a polymer binder}
- C08J 7/046: Forming abrasion-resistant coatings; Forming surface-hardening coatings
- G02B 1/04: made of organic materials, e.g. plastics (G02B1/08 takes precedence)
- G02B 1/14: Protective coatings, e.g. hard coatings
- G02B 5/08: Mirrors {(vehicle mirrors involving special optical features B60R1/08)}
- B32B 2307/40: having particular optical properties
- B32B 2307/416: Reflective
- B32B 2307/536: Hardness
- B32B 2307/538: Roughness
- B32B 2307/581: Resistant to cut
- B32B 2451/00: Decorative or ornamental articles
- B32B 2551/08: Mirrors
- C08J 2323/12: Polypropene
- E04F 13/0866: {composed of several layers, e.g. sandwich panels or layered panels (layered products as such in general B32B; producing decorative panels or veneers B44C5/04; E04F13/0864, E04F13/0875 take precedence)}
- G02B 5/0808: {having a single reflecting layer (G02B5/0883, G02B5/0891 take precedence)}
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- E04F: FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS (windows, doors E06B)

## Abstract

The present invention provides a mirror surface decorative sheet having excellent specularity, excellent surface properties, and excellent processability in which neither springback nor cracking occurs during the processing steps, and a mirror surface decorative plate using this mirror surface decorative sheet. The present invention relates to a mirror surface decorative sheet comprising at least a base sheet and a surface-protecting layer, and having a crack elongation as measured by a predetermined method of 10 to 20%, the base sheet being formed of a polypropylene resin, the base sheet having a thickness of 150 to 500 μm, and the base sheet having a ten-point mean roughness (Rzjis) of a surface as measured according to JIS B 0601: 2001 of 5 μm or less, the surface-protecting layer being a cured product of an ionizing radiation-curable resin composition, the surface-protecting layer having a thickness of 7 to 17 μm.

## Claims

### Claim 1

A mirror surface decorative sheet comprising at least a base sheet and a surface-protecting layer, and having a crack elongation as measured by the following method of 10 to 20%,
the base sheet being formed of a polypropylene resin, the base sheet having a thickness of 150 to 500 μm, the base sheet having a ten-point mean roughness (Rzjis) of a surface that is on the surface-protecting layer side as measured according to JIS B 0601: 2001 of 5 μm or less,
the surface-protecting layer being a cured product of an ionizing radiation-curable resin composition, the surface-protecting layer having a thickness of 7 to 17 μm:
Measurement of crack elongation:
a rectangular test sample is prepared according to JIS K 7127 using a decorative sheet, placed in a temperature environment of 70° C., and pulled at an arbitrary elongation using a tensile tester at a tensile rate of 20 mm/min, an 80-mm distance between chucks, and a width of 25 mm; thereafter, the test sample between the chucks is colored with a whiteboard marker, the colored portion is wiped off with cloth, and the degree of elongation at which the color cannot be wiped off due to the occurrence of cracking is determined as a crack elongation.

### Claim 2 (depends on 1)

The mirror surface decorative sheet according to claim 1, further comprising a primer layer formed of a resin composition A containing a binder resin A and a matting agent A between the base sheet and the surface-protecting layer,
wherein the matting agent A has an average particle diameter of 0.5 to 8 μm, and the matting agent A is contained in an amount of 0.5 to 20 parts by mass, per 100 parts by mass of the binder resin A.

### Claim 3 (depends on 1)

The mirror surface decorative sheet according to claim 1, further comprising a rear primer layer formed of a resin composition B containing a binder resin B and a matting agent B on a side of the base sheet opposite to the side comprising the surface-protecting layer,
wherein the matting agent B has an average particle diameter of 0.5 to 8 μm, and the matting agent B is contained in an amount of 0.5 to 20 parts by mass, per 100 parts by mass of the binder resin B.

### Claim 4 (depends on 1)

The mirror surface decorative sheet according to claim 1, wherein the ionizing radiation-curable resin contained in the ionizing radiation-curable resin composition is an electron beam-curable resin.

### Claim 5 (depends on 1)

The mirror surface decorative sheet according to claim 1, wherein the surface-protecting layer contains a scratch-resistant filler in an amount of 0.5 to 12 parts by mass, per 100 parts by mass of the ionizing radiation-curable resin contained in the ionizing radiation-curable resin composition.

### Claim 6 (depends on 1)

The mirror surface decorative sheet according to claim 1, further comprising a masking film on the surface-protecting layer.

### Claim 7 (depends on 1)

A mirror surface decorative plate comprising a base plate, an adhesive layer, and the mirror surface decorative sheet of claim 1, in this order.

### Claim 8 (depends on 2)

The mirror surface decorative sheet according to claim 2, further comprising a rear primer layer formed of a resin composition B containing a binder resin B and a matting agent B on a side of the base sheet opposite to the side comprising the surface-protecting layer,
wherein the matting agent B has an average particle diameter of 0.5 to 8 μm, and the matting agent B is contained in an amount of 0.5 to 20 parts by mass, per 100 parts by mass of the binder resin B.

### Claim 9 (depends on 2)

The mirror surface decorative sheet according to claim 2, wherein the ionizing radiation-curable resin contained in the ionizing radiation-curable resin composition is an electron beam-curable resin.

### Claim 10 (depends on 2)

The mirror surface decorative sheet according to claim 2, wherein the surface-protecting layer contains a scratch-resistant filler in an amount of 0.5 to 12 parts by mass, per 100 parts by mass of the ionizing radiation-curable resin contained in the ionizing radiation-curable resin composition.

### Claim 11 (depends on 2)

The mirror surface decorative sheet according to claim 2, further comprising a masking film on the surface-protecting layer.

### Claim 12 (depends on 2)

A mirror surface decorative plate comprising a base plate, an adhesive layer, and the mirror surface decorative sheet of claim 2, in this order.