Hot melt adhesives and the components used in their manufacture are generally solid
or highly viscous at room temperature. As a result, hot melt adhesives are exposed
to elevated temperatures, which are required to melt the components, during both
formulation and end use. When exposed to elevated temperatures the hot melt adhesives
become susceptible to thermo-oxidative degradation.
Signs of adhesives degradation during formulation and processing include:
Signs of degradation during end use include:
- Viscosity changes
- Char Formation
- Loss of adhesion
- Loss of cohesive strength
- Loss of peel strength, etc.
Antioxidants play a key role in the following hot-melt systems.
Recent developments in the bulk delivery and storage of hot melt adhesives have
allowed manufacturers and their customers to increase productivity, reduce costs
and decrease waste. To make this possible, the adhesive is stored and kept at elevated
temperatures of greater than 100°C. Chemical market offers a wide range of stabilizers
and stabilizer systems to ensure that the quality and performance of the adhesive
is protected during shipment, through storage and use.