Stretch-sleeve film

Patent metadata

Field	Value
Publication number	US-10343367-B2
Application number	US-201414781624-A
Country	US
Kind code	B2
Filing date	Apr 15, 2014
Priority date	Apr 15, 2013
Publication date	Jul 9, 2019
Grant date	Jul 9, 2019

Abstract

The present invention concerns a film (1), which contains at least one inner layer (3, 4, 5) and two outer layers (2, 6) enclosing at least one inner layer (3, 4, 5) where the, at least one, inner layer (3, 4, 5) contains a polymer A in a quantity from 70 to 100 wt. %, preferably 80 to 99 wt. % and especially preferably from 90 to 99 wt. %, relative to the total weight of the inner layer (3, 4, 5), which is characterized by special interesting properties, where the outer layers (2, 6) contain a mixture of polymer A and a polymer B, where polymer B is selected from the group consisting of low-density polyethylenes, said film (1) having a thickness from 30 to 70 μm, preferably 35 to 60 μm and especially 40 to 55 and an elastic restoring capacity of more than 95% at an elongation of 55%. The present invention also concerns a process for the production of a film, the use of the wealth. As a stretch-sleeve up film and articles provided with the oil of the invention, such as packaging. The present disclosure is directed to a stretch-sleeve film and articles including the stretch-sleeve film. The stretch-sleeve film includes at least three layers including two skin layers and a core layer. The core layer includes at least 75 wt % of an ethylene/a-olefin copolymer (A) characterized by (i) a density from 0.890 g/cc to 0.920 g/cc; (ii) a Mw/Mn from 2.0 to 4.0; (iii) a ZSVR less than 6.0; and (iv) a CDC from 85 to 150. At least one skin layer includes a polymeric material selected from the ethylene/a-olefin copolymer (A), a low density polyethylene, a medium density polyethylene, and combinations thereof. The stretch-sleeve film has an elastic recovery at 55% stretch of at least 95%.

First claim

The invention claimed is:

1. A stretch-sleeve film comprising:
a. at least three layers comprising two skin layers and a core layer;
b. the core layer comprising at least 75 wt % of an ethylene/1-octene copolymer (A) characterized by
i. a density from 0.890 g/cc to 0.910 g/cc;
ii. a Mw/Mn from 2.0 to 4.0;
iii. a ZSVR less than 6.0;
iv. a CDC from 85 to 150;
v. a vinyl unsaturation of less than 0.15 vinyls per 1000 carbon atoms; and

c. at least one of the skin layers comprises a polymeric material selected from the group consisting of the ethylene/1-octene copolymer (A), a low density polyethylene, a medium density polyethylene, and combinations thereof.

2. The stretch-sleeve film of claim 1 wherein the core layer comprises from 75 wt % to 100 wt % of the ethylene/1-octene copolymer (A) and from 25 wt % to 0 wt % of a polymeric material selected from the group consisting of a low density polyethylene, a medium density polyethylene, and combinations thereof.

3. The stretch-sleeve film of claim 1 wherein the core layer comprises from 75 wt % to 99 wt % of the ethylene/1-octene copolymer (A) and from 25 wt % to 1 wt % of a low density polyethylene.

4. The stretch-sleeve film of claim 1 wherein each skin layer is composed of the same polymeric material, the polymeric material selected from the group consisting of the ethylene/1-octene copolymer (A), a low density polyethylene, a medium density polyethylene, and combinations thereof.

5. The stretch-sleeve film of claim 1 wherein the stretch-sleeve film is a coextruded blown film.

6. The stretch-sleeve film of claim 1 comprising at least one inner layer located between the core layer and a skin layer, the inner layer comprising a polymeric material selected from the group consisting of the ethylene/1-octene copolymer (A), a low density polyethylene, a medium density polyethylene, and combinations thereof.

7. The stretch-sleeve film of claim 1 wherein the stretch-sleeve film comprises at least two inner layers, wherein each inner layer is located between the core layer and one of the skin layers.

8. The stretch-sleeve film of claim 1 having a thickness from 25 microns to 75 microns.

9. The stretch-sleeve film of claim 1 having an elastic recovery at 55% stretch of at least 95%.

10. The stretch-sleeve film of claim 1 having a tensile strength greater than 30 MPa.

11. The stretch-sleeve film of claim 1 having a modulus of elasticity of at least 95 MPa.

12. An article comprising:
a container; and
the stretch-sleeve film of claim 1 , the stretch-sleeve film surrounding an outer surface of the container.

13. The article of claim 12 wherein the film is compressively engaged to the outer surface with a holding force expressed as tensile strength from 4 MPa to 10 MPa.

14. The article of claim 12 wherein the stretch-sleeve film comprises at least one of printing and a colorant.

Assignees

• Dow Global Technologies Llc

Inventors

• Brunner Kurt
• Forster Hans Jörg
• Galatik Thomas

Classifications

• B32B2439/00

  Containers; Receptacles · CPC title

• B32B2307/54

  Yield strength; Tensile strength · CPC title

• B29L2009/00

  Layered products · CPC title

• B32B1/08 Primary

  Tubular products · CPC title

• B32B33/00

  Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class · CPC title