In-mold label and molded article using the same

• US 20070003777A1
• Filed: 03/02/2006
• Published: 01/04/2007
• Est. Priority Date: 03/03/2005
• Status: Active Grant

• Current Assignee: Yupo Corporation (Oji Holdings Corporation)
• Original Assignee: Yupo Corporation (Oji Holdings Corporation)
• Inventors: Nishizawa, Takatoshi, Iwasa, Yasuo, Mizuno, Hajime, Shiina, Masaki, Kimura, Masahiro
• Granted Patent: US 8,187,692 B2
• Time in Patent Office: Days
• US Class Current: 428/523
• CPC Class Codes: B32B 2250/03 3 layers
• CPC Class Codes: B32B 2250/242 All polymers belonging to those covered by group B32B27/32
• CPC Class Codes: B32B 2307/21 Anti-static
• CPC Class Codes: B32B 2307/4023 on the layer surface, e.g. ink
• CPC Class Codes: B32B 2307/406 Bright, glossy, shiny surface
• CPC Class Codes: B32B 2307/75 Printability
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/16 specially treated, e.g. irradiated
• CPC Class Codes: B32B 27/18 characterised by the use of special additives
• CPC Class Codes: B32B 27/32 comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• CPC Class Codes: Y10T 428/24355 Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
• CPC Class Codes: Y10T 428/31917 Next to polyene polymer
• CPC Class Codes: Y10T 428/31938 Polymer of monoethylenically unsaturated hydrocarbon

Abstract

The invention provides an in-mold label which enables the degree of scumming to be judged during printing and imparts a good appearance to molded articles produced through in-mold molding, and which comprises a base layer (I), a heat-sealable resin layer (II), and a printable layer (III) and has a haze in whole layer of 80-100% and an internal haze of 0-20%. The invention further provides a molded article obtained using the label.

Claims

1. An in-mold label which comprises a base layer (I), a heat-sealable resin layer (II), and a printable layer (III) and has a haze in whole layer of 80-100% and an internal haze of 0-20%.

2. The in-mold label of claim 1, wherein the printable layer (III) has a gloss (JIS-Z-8741;

measured at 75 degrees) of 40-90%.

3. The in-mold label of claim 1, wherein the printable layer (III) contains a maleic-acid-modified vinyl acetate polymer and has an ink adhesion strength, as measured at 24 hours or more after printing, of 1 kg·

cm or higher.

4. The in-mold label of claim 1, which when superposed on the same in-mold label, has a coefficient of machine-direction static friction (JIS-K-7125) between the heat-sealable resin layer (II) and the printable layer (III) of 0.55-1.0 and a coefficient of machine-direction kinetic friction between the heat-sealable resin layer (II) and the printable layer (III) of 0.3-1.0.

5. The in-mold label of claim 1, wherein the heat-sealable resin layer (II) has an arithmetic average roughness (Ra) and a ten-point average roughness (Rz), which indicate the surface roughness (JIS-B-0601) of the layer, of 0.5-10 μ

m and 10-50 μ

m, respectively.

6. The in-mold label of claim 1, wherein the printable layer (III) has an arithmetic average roughness (Ra) and a ten-point average roughness (Rz), which indicate the surface roughness (JIS-B-0601) of the layer, of 0.15-2.0 μ

m and 2-20 μ

m, respectively.

7. The in-mold label of claim 1, wherein the base layer (I), heat-sealable resin layer (II), and printable layer (III) comprise an unstretched film.

8. The in-mold label of claim 1, wherein the heat-sealable resin layer (II) comprises a polyethylene resin having a melting point of 110°

C. or lower.

9. The in-mold label of claim 1, wherein at least the heat-sealable resin layer (II) contains an antistatic agent.

10. The in-mold label of claim 1, wherein the printable layer (III) is printed by a printing technique selected from letterpress printing, gravure printing, offset printing, flexography, and screen printing.

11. A molded article in which the in-mold label of claim 1 is attached.

12. The molded article of claim 11, which comprises a polyolefin resin.