USA As Represented by Secretary of the Navy

Edward Balizer

Gilbert F Lee

Curtis A Martin

Jeffry J Fedderly

A composite armor including a ballistic armor layer and a directly attached polyurea layer. The polyurea layer is the cured reaction product of an isocyanate curing agent and a mixture of diamines having the general formula:HN-Ph-(C&#x2550;O)&#x2014;O&#x2014;(CH&#x2014;CH&#x2014;CH&#x2014;CH&#x2014;O)&#x2014;(C&#x2550;O)-Ph-NH,wherein in the mixture n in the ranges from 3 to 14 and the weight average value of n is about 9 to 10. Ph represents phenyl. In a preferred embodiment, the polyurea layer is the strike face. The composite armor is useful for light armor applications in which weight is a factor such as military vehicle armor and military boat armor.

Polyurea composite armor

A phase mixed thermoplastic polyurethane elastomer is provided for use in tranducers including underwater transducers, sonars and other electrostriction driven devices. The thermoplastic polyurethane elastomer includes an isocyanate, a butanediol, a polytetramethylene ether glycol, and a polyhydric alcohol. The thermoplastic polyurethane elastomer being made by adding the polytetramethylene ether glycol to isocyanate to form a mixture, then holding said mixture of the polytetramethylene ether glycol and isocyanate to a predetermined temperature for a predetermined time, degassing the mixture and sealing the mixture, measuring the percent free isocyanate to a predetermined molar ratio with the polytetramethylene ether glycol, chain extending the mixture into a first polymer with the butanediol and the polyhydric alcohol, adjusting the stoichiometry of said chain extender to a predetermined isocyanate index to avoid crosslinking, and postcuring the resin of the first polymer for a predetermined time and temperature.

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Bethesda, MD, United States of America

Edward Balizer