阅读说明：本技术 聚乙烯膜组合物，层压体，及其制造方法 (Polyethylene film composition, laminate, and method for producing same ) 是由 B·安布鲁斯 于 2018-12-03 设计创作，主要内容包括：公开了一种透明膜,其具有含至少50wt％高密度聚乙烯,和任选地小于或等于50wt％的线性低密度聚乙烯的芯层。进一步地,该透明膜可具有与芯层的第一侧相邻的可印刷表层,其中可印刷表层可包括线性低密度聚乙烯或乙烯-丙烯共聚物,基本上由其组成,或者由其组成。进一步地,透明膜可具有与芯层的第二侧相邻的表层,其中该表层可包括线性低密度聚乙烯或乙烯-丙烯共聚物,基本上由其组成,或者由其组成。仍然进一步地,可在至少一个方向上取向透明膜,且该透明膜具有至少1200MPa的方向模量。可层压这种透明膜到层压基底,例如双轴取向的聚乙烯单层或多层膜上,以产生具有突出的密封和完整性的层压膜。(A transparent film is disclosed having a core layer comprising at least 50 wt% high density polyethylene, and optionally less than or equal to 50 wt% linear low density polyethylene. Further, the transparent film may have a printable skin layer adjacent to the first side of the core layer, wherein the printable skin layer may comprise, consist essentially of, or consist of linear low density polyethylene or ethylene-propylene copolymer. Further, the transparent film may have a skin layer adjacent to the second side of the core layer, wherein the skin layer may comprise, consist essentially of, or consist of linear low density polyethylene or ethylene-propylene copolymer. Still further, the transparent film can be oriented in at least one direction and has a directional modulus of at least 1200 MPa. Such transparent films can be laminated to a laminate substrate, such as a biaxially oriented polyethylene monolayer or multilayer film, to produce a laminated film having outstanding sealing and integrity.)

1. A transparent film, comprising:

a core comprising at least 50 wt% high density polyethylene;

a printable skin layer adjacent to the first side of the core;

a skin adjacent to the second side of the core,

wherein the transparent film is oriented in at least one direction and has a directional modulus of at least 1200 MPa.

2. The transparent film of claim 1, wherein the printable skin layer consists essentially of linear low density polyethylene or ethylene-propylene copolymer.

3. The transparent film of claim 1, wherein the skin layer consists essentially of linear low density polyethylene or ethylene-propylene copolymer.

4. The transparent film of claim 1, further comprising less than or equal to 50 wt% of a linear low density polyethylene.

5. The transparent film of claim 1, further comprising one or more additives.

6. The transparent film of claim 1, further comprising one or more tie layers.

7. The transparent film of claim 1, wherein the transparent film has a thickness of less than or equal to 20 μm.

8. The transparent film of claim 1, wherein the transparent film has a haze of less than or equal to 10%.

9. The transparent film of claim 1, wherein the transparent film has a dimensional stability of less than 10% after 7 minutes at 100 ℃ in an oven.

10. The transparent film of claim 1, wherein the transparent film withstands a directional stress of at least 70 MPa.

11. The transparent film of claim 1, wherein the transparent film withstands a directional stress of at least 60 MPa.

12. The transparent film of claim 1, wherein the transparent film is coextruded.

13. The transparent film of claim 1, further comprising a laminate substrate, wherein the transparent film is laminated to the laminate substrate to produce the laminate film.

14. The transparent film of claim 13, wherein the laminate substrate is transparent.

15. The transparent film of claim 13 wherein the laminated substrate is an unoriented film.

16. The transparent film of claim 13 wherein the laminated substrate is metallized.

17. The transparent film of claim 13, wherein the laminate substrate is coated.

18. The transparent film of claim 13, further comprising an adhesive between the transparent film and the laminate substrate.

19. The transparent film of claim 13, wherein the laminate film has a seal strength of at least 2000 g/inch at 130 ℃.

20. The transparent film of claim 13, wherein a 450 gram bag of the laminated film falling from two meters remains intact.

Technical Field

The present disclosure relates to compositions, structures and methods for polyethylene films that include both barrier protection and improved sealing performance in packaging, packaging and labeling applications.

Background

Polyethylene films are widely used as seals in packaging. Unoriented films typically have moderate physical properties and need to be bonded to other webs such as paper, PET, BOPP, etc. to provide mechanical strength, or such as metallized PET, metallized BOPP, nylon, or aluminum foil to provide barrier protection. Although orientation often improves strength, it also negatively affects sealing performance, which is undesirable for packaging. Moreover, conventional cast or blown polyethylene sealant films are typically not metallized because the metal adhesion does not adhere well to maintain integrity when laminated to a rigid web.

There is a need for new multilayer films having barrier protection as well as improved sealing performance and package integrity. Furthermore, there is a need for new multilayer films that are resistant to metallization and provide good metal adhesion and barrier properties to metallization.

Summary of The Invention

A transparent film having a core comprising at least 50 wt% high density polyethylene, and optionally less than or equal to 50 wt% linear low density polyethylene. Further, the transparent film may have a printable skin layer adjacent to the first side of the core, wherein the printable skin layer may comprise, consist essentially of, or consist of linear low density polyethylene or ethylene-propylene copolymer. Further, the transparent film can have a skin layer adjacent to the second side of the core, wherein the skin layer can comprise, consist essentially of, or consist of linear low density polyethylene or ethylene-propylene copolymer. Still further, the transparent film can be oriented in at least one direction and has a directional modulus (directional module) of at least 1200 MPa. Such transparent films can be laminated to a laminate substrate, such as a biaxially oriented polyethylene monolayer or multilayer film, to produce a laminated film having outstanding sealing and integrity.

example 1