Permanent adhesives may divided into three classes:

1. Waterborne System

Until some years ago, waterborne systems yielded films with limited performance, their main setback being poor resistance to moisture. The availability of new raw materials paved the way for the development of formulations overcoming the above shortcomings across the whole tack spectrum (see HydroVistasol), thus creating a real alternative to solventborne products

2. Solventborne Systems
Through the use of solventborne systems one obtains films with better durability and resistance against washing. Our VISTASOL permanent adhesives belong to this class.

3. Thermoplastic Adhesives
Thermoplastic adhesives deserve a particular mention. Though all permanent adhesives are thermosensitive, only those which become active at certain temperatures and perform in a peculiar way as temperature increases are defined as thermoplastic. The graph below shows the different behaviour of permanent and thermoplastic adhesives.

The former show a linear tack increase as the temperature rises, until they become too soft and their cohesion too low; the latter, once having attained a certain tack, retain their cohesion, thanks to their limited sensitivity to further temperature increase.
The increasing degree to which printing machines with fabric heating device and tables with internal heating are employed all over the world causes an ever widening usage of these particular adhesives. Our own thermoplastic VISTASOL play an important role in this segment.
Villa Industrie Chimiche - Theoretical background - Technical features - Vistasol line - Italian version
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