Abstract:

PBT/PC alloys have a great number of excellent properties. In this paper， the characteristics of PBT/PC alloy films were studied， which included light transmittance， surface tension， surface resistance， carbon powder adhesion， printing smoothness and others that are required for document manufacture. The optimum pressing conditions for the PBT/PC alloy films with a PETG?matrix card material were investigated under a certain temperature and pressure. The image quality， peel strength and other properties of the certificate were obtained from the laminates of PBT/PC alloy films with the PETG-matrix card material. The durability of the document was studied through an accelerated aging test， and the image quality， bending and torsion performance， dimensional stability and electrical property of the document after aging were also evaluated. The results indicated that the printing image of the PBT/PC alloy films was clear and firm， and their optimum processing conditions with the PETG-matrix card material were determined to be a temperature of 135 °C， a pressure of 1.5 MPa and a time of 15~20 s. The obtained document has a clear performance image and firm peeling strength. The accelerated aging test results revealed that the image quality， bending and torsion properties， dimensional stability and electrical properties of the document could meet the requirement of the standard. The certificate can be used for at least 5 years. The PBT/PC alloy films can be used for the production of the document based on the PETG?matrix card material.

Key words: document, polycarbonate, polybuylene terephthalate alloy films, poly（ethylene terephthate-co-1, 4-cylohexylenedimethylene terephthalate）