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Compositional Analysis of Laminated Plastic Films

IP.com Disclosure Number: IPCOM000044824D
Original Publication Date: 1984-Oct-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Chen, HH: AUTHOR

Abstract

Selective delamination of a multi-layer, laminated plastic film, using specific solvents, and the use of regular and attenuated total reflectance infrared (ATR-IR) spectroscopy techniques, allows analysis of the polymeric content of the individual film layers. Such films are usable as toner bags.

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Compositional Analysis of Laminated Plastic Films

Selective delamination of a multi-layer, laminated plastic film, using specific solvents, and the use of regular and attenuated total reflectance infrared (ATR- IR) spectroscopy techniques, allows analysis of the polymeric content of the individual film layers. Such films are usable as toner bags.

An example film to be analyzed contains (l) a central layer, 2.0 mil thick, of EVA (ethylene-vinyl acetate copolymer - 7.5% vinyl acetate), having (2) a 0.75 mil thick layer of nylon on one side, and (3) a l.0 mil thick layer of EVA (l8% vinyl acetate) on the other side.

This film is delaminated using chloroform to dissolve the interlayer polyurethane-type adhesive. The nylon layer is then identified using ATR-IR spectrography techniques. The middle layer is identified by dissolving the layer in hot toluene, whereupon the percent vinyl acetate is determined by measuring the ratio of the C-H stretching band at 2900 cm-l, as related to the C=O stretching band at l720 cm-l, in the infrared spectrum. The l8% vinyl acetate layer is identified by dissolving the layer in hot THF, followed by measurement of its infrared spectral content.

A second exemplary film comprises (l) a central layer of polyethylene, 2.0 mil thick, having (2) a l.0 mil thick layer of nylon on one side, and (3) a l.0 mil thick layer of EVA (l8% vinyl acetate) on the other side. Here again, chloroform is used to delaminate the film. The EVA layer is identif...