New black adhesives from Panacol cure with UV radiation

Conventional black UV adhesives have a major disadvantage: the black color absorbs a high proportion of the UV intensity, which means that the energy required to fully polymerize an adhesive can only penetrate a few micrometers. This results in skin formation on black adhesives, but not complete cure. The majority of the black adhesive must then be cured in a secondary thermal curing step at temperatures in excess of 100°C. Panacol's new "Black&Light" technology enables the complete curing of black epoxy adhesives with pure LED curing from a few hundred micrometers to millimeters layer thickness. The adhesives are suitable for various encapsulations, GlobTops or edge bonders in electronics manufacturing, as well as for optical adhesive systems where high OD (optical density) values are required in optoelectronic applications, for example to minimize reflections or to achieve certain transmission values for sensors.
 
A manufacturing process using the "Black&Light" technology developed by Panacol is as follows: The black adhesive is metered and cured with the appropriate wavelength and intensity. During the curing process, the beams penetrate once through the entire adhesive system, thus ensuring complete curing. After polymerization, the structures of the "Black&Light" epoxy close again, resulting in a fully cured adhesive system that remains irreversibly black. The "Black&Light" technology is compatible with many of Panacol's Vitralit epoxy adhesives and can be combined depending on the blackness and depth of cure required. This means that the "Black&Light" adhesive systems can be very individually adapted to specifications of the respective application. Another major advantage of the "Black&Light" adhesives is storage: While conventional black-filled epoxy adhesives usually have to be stored frozen, the "Black&Light" epoxy resins can be stored and shipped at room temperature or refrigerated to a maximum.