The variety of materials used in today’s (packaging) industry is overwhelming. When materials with very different properties need to be chemically joined, the process often reaches limitations because the materials are incompatible, poorly compatible or only combinable with the use of bonding agents. In such cases, a seal coating often is not adequate for promoting adhesion or bonding. To meet demanding applications of this kind, Trüb Emulsions Chemie AG has developed its special primer dispersions.
|Product Name||Business||Baseproduct (Basic)||Solid Fuel||pH||Datasheets||Comments|
|TECSEAL E-712||Flexible Packaging||Ethylene-acrylate-dispersion||25.0||8.5||Login||Very good resistance against water and fats. Binds very well to metals, cardboard, paper and PE film. It can also be used for cardboard and paper as water vapor barrier coating.|
|TECSEAL E-799/35||Flexible Packaging||Ethylene-acrylate-dispersion||35.0||8.0||Login||Very good adhesion on aluminum (primer); For water vapor barrier coating on paper and cardboard. Sealing temperature ~ 80 ° C .|
|TECSEAL E-799/45||Flexible Packaging||Ethylene-acrylate-dispersion||45.0||8.0||Login||Same as TECSEAL E - 799/35, and with higher solid content, but as well for paper and cardboard.|
|TECSEAL PF-33||Flexible Packaging||modified imine-dispersion||5.0||10.5||Login||Due to the good adhesion to many substrates, PF - 33 is an ideal primer for extrusion applications.|
These primer dispersions are used to promote adhesion between extruded films/composite films, which subsequently are to be sealed. However, they also can be used to strengthen a seal.
Primer dispersions further are used widely in the printing industry, e.g. in digital printing processes. The primer in this case is essential for ensuring adhesion of the toner or printing ink on a broad range of packaging materials. In printing yoghurt tub covers, for instance, the primer serves not only as a substrate for the high-quality printing of various inks, but also as a protective layer on the aluminum against the effects of sterilization and other stages of processing.
A primer dispersion is applied in a first coating to one of the two substrates and dried. This coating establishes the desired (heat seal dispersion) compatibility between the materials: It displays the adhesive properties required to permanently join the first substrate to the second in a subsequent heat seal dispersion step. Thanks to the primer, the heat seal dispersion can now adhere to the otherwise incompatible material (of choice) and bond it to the second material of choice. The result is a composite with four layers: Incompatible material (of choice) – The primer anchored in it – Heat seal dispersion – Compatible second material.