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Immediate Post-Mold Lamination of Polycarbonate and Adhesive

IP.com Disclosure Number: IPCOM000009751D
Publication Date: 2002-Sep-16
Document File: 1 page(s) / 22K

Publishing Venue

The IP.com Prior Art Database

Abstract

The current industrial practice is to pre-bake a polycarbonate substrate before adhesive lamination. Immediate post-mold lamination of an adhesive to an injection molded polycarbonate article produces a bonded part that passes the accelerated storage test just as in the prior pre-bake process. The samples were bubble free and did not delaminate when made via the pre-bake step or via immediate post-mold lamination.

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Abstract

Immediate Post-Mold Lamination of Polycarbonate and Adhesive

The current industrial practice is to pre-bake a polycarbonate substrate before adhesive lamination.� Immediate post-mold lamination of an adhesive to an injection molded polycarbonate article produces a bonded part that passes the accelerated storage test just as in the prior pre-bake process.� The samples were bubble free and did not delaminate when made via the pre-bake step or via immediate post-mold lamination.

Immediate Post-Mold Lamination of Polycarbonate and Adhesive

Applications exist for a thin, optically clear adhesive to bond a label to a clear polymer substrate such as polycarbonate for a printer front cover).� An example of one such application requires that the bonded part pass an accelerated test of 65 degrees C, 90% R. H. for 24 hours.� Polymer materials such as polycarbonate are known to contain moisture and do not pass this test, probably due to moisture out-gassing.� Significant delamination of the adhesive from substrate occurs due to the high temperature and humidity condition for a long period of time that caused the moisture to outgas from the polycarbonate.�

The current industrial practice is to pre-bake the polycarbonate substrate prior to adhesive lamination.� A pre-bake was performed for the polycarbonate panels prior to adhesive lamination and tested for accelerated test.� The pre-bake condition was 200 degrees F for 24 hours.� The tested samples showed that with the pre-bake...