- 9 March 2007 -
Dyneon develops anti-dripping additive

Dyneon™ MM 5935 EF, an anti-dripping melt modifier for flame retardant thermoplastics, has been developed by fluoropolymer producer Dyneon. It is the first in a new family of melt modifiers being produced by the company and meets the requirements of UL 94 vertical burn test for flame retardant thermoplastics typically used in electronic and electrical applications.

The product is said to be easier to handle and process than standard polytetrafluoroethylene (PTFE) fine powders. It can be stored above 19°C without premature fibrillation, meaning it can be stored and transported without refrigeration.
The melt modifier also has free-flowing characteristics, giving excellent dispersion in compounds and resins of acrylonite butadeine styrene (ABS), high-impact polystyrene (HIPS), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polycarbonate (PC), polyethylene (PE) and polypropylene (PP) amongst others. This dispersion enables the use of the lower concentrations needed for reliable anti-dripping.

The additive and other PTFE fine powders form fibrils of 50 mm thickness under conditions of high shear, creating a physical network frozen in the plastic. When the thermoplastic melts or burns, the fibrils relax causing contraction and suppress dripping.

Dyneon; www.dyneon.com