Transparent, Reinforced, Composite Fibers for Lenses and Windows

The Natick Soldier RD&E; Center is developing transparent, multi-component, reinforced composite fibers to provide improved transparent ballistic protection for Warfighters. These new reinforced fibers range in complexity from simple sheath-core structures to arrays organized as “islands in the sea” and can be used to create transparent fiber reinforced composites articles such as lenses and windows. At present, Natick scientists have been able to demonstrate retention of strength of fibers during consolidation,and levels of visible light transmission over 80%. Natick’s best transparent reinforced composite structures have low density and currently offer 10% to 20% greater ballistic impact resistance as compared to molded polycarbonate, the standard for plastic optics and glazing. Moreover, these transparent, reinforced composites are made from polypropylene, a base material that costs about one-third of typical polycarbonate. The current composites may already be competitive for skylights or applications where diffuse light transmission is acceptable. However, these structures are more complex to manufacture than a simple injection molded lens, and while they achieve good light transmission, they have not yet achieved the optical clarity required for eyewear. Scientists at Natick believe there is significant room for improvement in the technology, particularly for applications that require greater optical clarity such as goggle lenses and face shields. Benefits 10-20% greater ballistic protection (with potential for improvement) Lighweight, low density Low-cost starting materials Opportunities for joint inventions and licensing The US Army is seeking improved transparent ballistic protection at an affordable cost for Warfighters, vehicles and structures. Scientists at Natick have developed and have a pending patent on a technology that relates to transparent, reinforced composites for lenses, windows, etc. Opportunities to collaborate with Natick under a CRADA, to jointly improve the technology, and to license the pending patent are available.