Ballistic-resistant article

Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including interlaminar mechanical fastener

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428229, 428911, D03D 300

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active

044579853

ABSTRACT:
Articles such as vests, helmets and structural elements containing a network of ultrahigh molecular weight, high strength, high modulus polyethylene or polypropylene fibers. The fibers, and especially polyethylene fibers of 15, 20, 25, 30 or more g/denier tenacity, and 300, 500, 1,000, 1,500 or more g/denier tensile modulus impart exceptional ballistic resistance to the articles in spite of the melting points, e.g. 145.degree.-151.degree. C. for the polyethylene fibers and 168.degree.-171.degree. C. for the polypropylene fibers, which are high for these polymers, but substantially lower than the 200.degree. C. or more melting point previously thought necessary for good ballistic resistance.

REFERENCES:
patent: 4403012 (1983-09-01), Harpell et al.
R. C. Liable et al., "The Application of High-Modulus Fibers to Ballistic Protection," J. Macromol. Sci.-Chem., A7(1), pp. 295-298, 312-314, 320-322, ('73).
R. C. Liable, "Ballistic Materials and Penetration Mechanics," Methods and Phenomena: Their Applications in Sci. and Tech., 1980, vol. 5, pp. 72-115.
J. V. Hansen et al., "Flexible Body Armor Materials," 10th National State of the Art Symposium, Washington, D.C., Jun. 1974.
A. L. Alesi et al., "New Materials and Construction for Improved Helmets," Nov. 1975, pp. 1-11.

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