Anti-fogging, stretched, multilayer film excellent in quick-acting property and method for producing the same

• US 20030049471A1
• Filed: 10/17/2002
• Published: 03/13/2003
• Est. Priority Date: 04/18/2000
• Status: Active Grant

• Current Assignee: Gunze Limited
• Original Assignee: Gunze Limited
• Inventors: Kuriu, Hiroki
• Granted Patent: US 7,014,920 B2
• Time in Patent Office: Days
• US Class Current: 428/474.4
• CPC Class Codes: B32B 27/18 characterised by the use of special additives
• CPC Class Codes: B32B 27/30 comprising vinyl (co)polymers; comprising acrylic (co)polymers
• CPC Class Codes: B32B 27/32 comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• CPC Class Codes: B32B 27/34 comprising polyamides
• CPC Class Codes: Y10T 428/13 Hollow or container type article [e.g., tube, vase, etc.]
• CPC Class Codes: Y10T 428/1307 Bag or tubular film [e.g., pouch, flexible food casing, envelope, etc.]
• CPC Class Codes: Y10T 428/1328 Shrinkable or shrunk [e.g., due to heat, solvent, volatile agent, restraint removal, etc.]
• CPC Class Codes: Y10T 428/1334 Nonself-supporting tubular film or bag [e.g., pouch, envelope, packet, etc.]
• CPC Class Codes: Y10T 428/1352 Polymer or resin containing [i.e., natural or synthetic]
• CPC Class Codes: Y10T 428/1386 Natural or synthetic rubber or rubber-like compound containing
• CPC Class Codes: Y10T 428/1393 Multilayer [continuous layer]
• CPC Class Codes: Y10T 428/24058 including grain, strips, or filamentary elements in respective layers or components in angular relation
• CPC Class Codes: Y10T 428/31667 Next to addition polymer from unsaturated monomers, or aldehyde or ketone condensation product
• CPC Class Codes: Y10T 428/31725 Of polyamide
• CPC Class Codes: Y10T 428/31728 Next to second layer of polyamide
• CPC Class Codes: Y10T 428/31732 At least one layer is nylon type
• CPC Class Codes: Y10T 428/31743 Next to addition polymer from unsaturated monomer[s]

Abstract

An anti-fogging, stretched, multilayer film comprising a layer having an anti-fogging agent incorporated therein, the film having evaluated values for anti-fogging property of 28 mm² or more at temperatures of −5° C. and 15° C., respectively.

Claims

1. An anti-fogging, stretched, multilayer film comprising a layer having an anti-fogging agent incorporated therein, the film having evaluated values for anti-fogging property of 28 mm² or more at temperatures of −

5°

C. and 15°

C., respectively.

2. An anti-fogging, stretched, multilayer film according to claim 1 wherein the layer having an anti-fogging agent incorporated therein is a linear low density polyethylene resin layer comprising a fatty acid ester of polyalcohol in an amount of 15,000 to 30,000 ppm.

3. An anti-fogging, stretched, multilayer film according to claim 1 having a structure of layers in the order of polyamide resin/saponified product of ethylene-vinyl acetate copolymer/polyamide resin/modified-polyolefin adhesive resin/linear low density polyethylene resin.

4. An anti-fogging, stretched, multilayer film according to claim 1 having shrinkage rates in MD and TD of 10% or more, respectively, measured after being left to stand in water having a temperature of 80°

C. for 30 seconds.

5. A method for preparing an anti-fogging, stretched, multilayer film of claim 1 comprising annealing a film at a film surface temperature of 60 to 130°

C.