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Spin-stabilized non-lethal projectile with a shear-thinning fluid

  • US 9,835,426 B2
  • Filed: 06/10/2016
  • Issued: 12/05/2017
  • Est. Priority Date: 01/16/2012
  • Status: Active Grant
First Claim
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1. A cartridge comprising:

  • a cartridge casing comprising a seating portion for receiving a projectile; and

    the projectile received in the seating portion of the cartridge casing, the projectile comprising;

    a frangible shell comprising a polymeric material having an interior cavity;

    the frangible shell comprising a cylindrical portion, wherein the frangible shell is configured to engage rifling in a barrel so that the projectile spins when fired through the barrel; and

    a shear-thinning fluid within the interior cavity, the shear-thinning fluid comprising an emulsifying agent chosen from glyceryl stearate, PEG-100 stearate, petrolatum, glycol strearate, and mixtures thereof;

    wherein the shear-thinning fluid has a spin-stabilizing viscosity that is greater than an impact dispersing viscosity, such that the impact dispersing viscosity of the shear-thinning fluid decreases with the rate of shear at impact with a target, and the impact dispersing viscosity of the shear-thinning fluid is less than about 30 Pa·

    s at a shear rate of about 50 Hz at about 25°

    C., and the impact dispersing viscosity of the shear-thinning fluid is less than about 30 Pa·

    s at shear rates greater than about 50 Hz at about 25°

    C., and the spin-stabilizing viscosity of the shear-thinning fluid is greater than about 560 Pa·

    s at shear rates less than about 2 Hz at about 25°

    C. in order to spin-stabilize the projectile.

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