Several types of interlayer are in use for the production of laminated safety glasses (LSG). The market is dominated by thermoplastic interlayers like polyvinylbutyral (PVB) or ionomeric polymers. In recent years, crosslinkable interlayers are stepping out of the shadow, replacing classic interlayers or finding new applications in glazings industries.
Thermoplastics are characterized by a melting point; above this temperature the film melts. For this reason, the melting temperature of the film must be in a temperature range above the usage temperature of LSG, but below the production temperature. Crosslinkable interlayers are delivered as thermoplastic films, too. With the introduction of heat during processing, a reaction is started in this interlayer leading to the formation of a highly cross-linked three-dimensional composite interlayer having duroplastic-elastomeric properties. The duroplastic structure of the interlayer provides the strength for laminated safety, security and design glass.