# US 2016/0355647 A1 · Polyolefin-based resin wrap film and wrap film-encasing body

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- Number: US 2016/0355647 A1
- Document ID: US20160355647A1
- Status: Published application
- Kind: A1
- Application number: 15/103,061
- Filed: 2014-12-15
- Published: 2016-12-08
- Earliest claimed: 2013-12-16
- Assignees: Asahi Kasei Kabushiki Kaisha
- Applicants: Asahi Kasei Kabushiki Kaisha
- Inventors: Aritaka UEDA; Yoshihiro ASADA
- Web page: https://patentgrep.com/patent/US20160355647A1

## CPC

- C08J 5/18: Manufacture of films or sheets
- B26F 3/02: Tearing
- B65D 65/02: Wrappers or flexible covers
- B65D 83/0847: {through an aperture at the junction of two walls}
- B65D 83/0882: {and for cutting interconnected articles}
- B65H 35/002: {Hand-held or table apparatus (B65H35/006 takes precedence)}
- B29C 55/28: of blown tubular films, e.g. by inflation {(extrusion moulding of tubular films B29C48/03)}
- B29K 2023/00: Use of polyalkenes {or derivatives thereof} as moulding material
- C08J 2323/08: Copolymers of ethene (C08J2323/16 takes precedence)
- C08J 2323/20: having four to nine carbon atoms
- C08J 2423/06: Polyethene
- C08J 2423/08: Copolymers of ethene (C08J2423/16 takes precedence)
- C08J 2423/12: Polypropene
- 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)
- B26F: PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING (marking-out, perforating or making buttonholes A41H25/00; shoemaking A43D; surgery A61B; punching metal B21D; drilling metal B23B; cutting of metal by applying heat locally, e.g. flame cutting, B23K; cutting by abrasive fluid jets B24C5/02; details common to machines for severing B26D; drilling wood B27C; drilling stone B28D; working of plastics or substances in a plastic state B29; making boxes, cartons, envelopes or bags, of paper or similarly worked materials, e.g. metal foil, B31B; of glass C03B; of leather C14B; of textile materials D06H; for light guides G02B6/25; of tickets G07B)
- B65D: CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65H: HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS

## Abstract

There is provided a polyolefin-based resin wrap film which contains a polyolefin-based resin, wherein the wrap film is torn in the machine direction when being torn in the machine direction; the wrap film is torn in the transverse direction when being torn in the transverse direction; the wrap film is torn either in the machine direction or in the transverse direction when being torn in a direction at 45° to the machine direction; an acute angle formed by a tearing direction and a cut line when the wrap film is torn in a direction at 45° to the machine direction is 30 to 60°; and a tear strength when the wrap film is torn in a direction at 45° to the machine direction is 10 g or lower.

## Claims

### Claim 1

A polyolefin-based resin wrap film comprising a polyolefin-based resin,
wherein the wrap film is torn in a machine direction when being torn in the machine direction;
the wrap film is torn in a transverse direction when being torn in the transverse direction;
the wrap film is torn either in the machine direction or in the transverse direction when being torn in a direction at 45° to the machine direction;
an acute angle formed by a tearing direction and a cut line when the wrap film is torn in a direction at 45° to the machine direction is 30 to 60°; and
a tear strength when the wrap film is torn in a direction at 45° to the machine direction is 10 g or lower.

### Claim 2 (depends on 1)

The polyolefin-based resin wrap film according to claim 1,
wherein an elastic modulus thereof in the machine direction is 300 MPa or higher;
a puncture strength thereof is 260 g or lower; and
a machine-direction shrinkage factor (Smd) thereof determined by the following formula (1) and a transverse-direction shrinkage factor (Std) thereof determined by the following formula (2) satisfy Smd≧2.5 times, Std≧2.5 times, Smd×Std≧10 times and Std/Smd=0.5 to 10:
machine-direction shrinkage factor (Smd)=100/(100−αmd) (1); and
transverse-direction shrinkage factor (Std)=100/(100−αtd) (2),
wherein in the above formulae (1) and (2), αmd represents a maximum thermal shrinkage (%) in the machine direction; and αtd represents a maximum thermal shrinkage (%) in the transverse direction.

### Claim 3 (depends on 1)

The polyolefin-based resin wrap film according to claim 1, wherein the polyolefin-based resin comprises a polyethylene-based resin.

### Claim 4 (depends on 1)

The polyolefin-based resin wrap film according to claim 1, wherein in an azimuth distribution profile of a scattering intensity at a scattering angle of 2θ=20.9° to 21.8° when an X-ray beam of 0.154 nm in wavelength is allowed to be incident on the film from a film normal direction and transmission wide-angle X-ray scattering is measured,
the azimuth distribution profile has four scattering peaks;
adjacent scattering peak intervals of the four scattering peaks are 90°±10°;
an oriented component ratio R is 0.01 or higher and 100 or lower; and
an average area of the four scattering peaks is 1 or larger and 89 or smaller.

### Claim 5 (depends on 1)

The polyolefin-based resin wrap film according to claim 1, wherein a melting point thereof in differential scanning calorimetry is 80 to 123° C.

### Claim 6 (depends on 1)

The polyolefin-based resin wrap film according to claim 1, wherein a gel fraction thereof is 10 to 60% by mass.

### Claim 7 (depends on 1)

The polyolefin-based resin wrap film according to claim 1, wherein a heat-resistive temperature thereof is 130° C. or higher.

### Claim 8 (depends on 1, 2, 3, 4, 5, 6, 7)

A roll obtained by winding a polyolefin-based resin wrap film according to any one of claims 1 to 7.

### Claim 9 (depends on 8)

A wrap film-encasing body, having a roll obtained by winding a polyethylene-based resin wrap film according to claim 8, and a container encasing the roll,
wherein the container has a cutting tool to cut the polyethylene-based resin wrap film.

### Claim 10 (depends on 9)

The wrap film-encasing body according to claim 9, wherein the cutting tool is a projection-like tool provided on a part of the container.

### Claim 11 (depends on 8)

A wrap film-encasing body, having a roll obtained by winding a polyethylene-based resin wrap film according to claim 8, and a container encasing the roll,
wherein the container has no cutting tool to cut the polyethylene-based resin wrap film.