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Corona Treated Polyethylene Film for Peelable Seal

IP.com Disclosure Number: IPCOM000242082D
Publication Date: 2015-Jun-18
Document File: 7 page(s) / 406K

Publishing Venue

The IP.com Prior Art Database

Related People

Zhi-Yi Shen: AUTHOR [+4]

Abstract

Two key points addressed by this disclosure, firstly is the creation of film with peelable seal characteristics at a seal strength plateau area by means of corona treatment. It is a cost effective solution compared to existing peelable seal solutions, i.e. using polybutene-1 in a sealing layer or Elastomer / Plastomer or Ionomers in a sealing layer. Secondly, is that after being corona treated, ExceedTM and EnableTM metallocene polyethylene polymers, supplied by ExxonMobil Chemical Company, Houston, TX, exhibit higher occurrences of peelable seal characteristics compared to Ziegler-Natta polyethylene and C8 metallocene polyethylene polymers.

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Corona Treated Polyethylene Film for Peelable Seal

Abstract:

Two key points addressed by this disclosure, firstly is the creation of film with peelable seal characteristics at a seal strength plateau area by means of corona treatment. It is a cost effective solution compared to existing peelable seal solutions, i.e. using polybutene-1 in a sealing layer or Elastomer / Plastomer or Ionomers in a sealing layer. Secondly, is that after being corona treated, ExceedTM and EnableTM metallocene polyethylene polymers, supplied by ExxonMobil Chemical Company, Houston, TX, exhibit higher occurrences of peelable seal characteristics compared to Ziegler-Natta polyethylene and C8 metallocene polyethylene polymers.

Background

Sealing strength measurements of polyethylene (PE) films with LLDPE (including Z-N LLDPE or metallocene PE) grades in the sealant layer of films usually show edge break failure at a seal strength plateau area. It's considered non-suitable for peelable seal applications that require peeling failure mode.

A common peelable seal formulation requires blending Polybutene-1 (PB) or Elastomer / Plastomer or Ionomers in the sealant layer with PE. Two distinct domains are created in the sealing layer during the crystallization of the polymers after extrusion. One component will end up as a dispersed phase in the continuous phase. A weak bond is created during the sealing step where identical polymer can fuse together.

The existing solution needs to blend different polymers. The dispersion of the blending determines the quality of peelable seal performance. The market is looking for a convenient solution to avoid blending and reduce the cost of producing peelable seal films.

Corona treatment is widely used in treating plastic film surface to increase its surface energy, leading to an improvement in adhesion of printing inks or other coatings. It accelerates emitted electrons to transfer energy through air molecules and then hit plastic surface to break up some C-H or C-C bonds to form polar groups. However, for PE film, the treated surface is normally viewed as defensive in sealing performance; therefore, the practice is to leave a sealant layer untreated.

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