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Binding Polyethylene Terephthalate Films to Polypropylene Films

IP.com Disclosure Number: IPCOM000246558D
Publication Date: 2016-Jun-16
Document File: 4 page(s) / 88K

Publishing Venue

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Abstract

A technique for the binding of polyethylene terephthalate and polypropylene surfaces is disclosed.

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This is the abbreviated version, containing approximately 51% of the total text.

Page 01 of 4

Binding Polyethylene Terephthalate Films to Polypropylene Films

Disclosed is a technique for the binding of polyethylene terephthalate and polypropylene surfaces. A polypropylene

surface is functionalized with carboxylic acids via a aqueous plasma surface treatment technique. Separately, a polyethylene terephthalate surface can be oxidized by a gaseous plasma technique (Figure 2) in oxygen to impart carboxylate and hydroxyl functionalities. The two surfaces are then sandwiched around a silicone or silane coupling agent and coupling catalyst mixture and bonded under ambient or elevated temperature.

The method disclosed herein binds PET film to PP film without having to start from a modified resin. A polypropylene film

is surface modified with a functional group, a polyethylene terephthalate film is surface modified with a functional group, and a coupling agent is used to react with the PP film's functional group and the PET film's functional group. Through chemical bonding, the two films are covalently bound at the interfaces where the two films meet.

A premade film of PP is functionalized with a chemical moiety that will allow for further adhesion during film bonding. The PP can be functionalized via a plasma technique (Figure 1) wherein the PP can be modified with a number of different

functional groups such as carboxylic acids (acetic acid, acrylic acid, maleic and itaconic acid) (Figure 5). Other functional groups can be chosen by those skilled in the art. Additionally, the method of liquid plasma treating (aqueous or non-aqueous) can be chosen by those skilled in the art. Next, a premade film of PET is functionalized with a chemical bonding group that allows for further adhesion during film bonding. The PET can be functionalized via a plasma technique wherein the PET can be functionalized with a number of different functional groups similar to that of the PP. This is generally done via a change in the gas (for instance, the use of a monomer gas, which contains the chemical

bonding group that is desired).

Figure 1

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Page 02 of 4

Figure 2

After surface...