Coating processes – Solid particles or fibers applied
Reexamination Certificate
1999-09-15
2001-05-15
Cameron, Erma (Department: 1762)
Coating processes
Solid particles or fibers applied
C427S369000, C427S370000, C427S389800, C427S389900, C427S393500, C428S375000, C428S378000, C428S379000, C428S390000, C428S391000, C428S392000, C428S395000
Reexamination Certificate
active
06231921
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to the use of cross-linkable polymer powders for producing ballistic-resistant fiber materials.
2. Background Art
It is known to produce protective armors by using materials based on textile sheet materials produced from aramid fibers. Examples are the armored vehicle floor coverings described in DE-A 3627485. Further examples are protective linings for motor vehicle doors described in DE-A 4236234. For the purposes mentioned, a plurality of plies of woven aramid fiber fabric are combined with polymeric binders to form multiply fabrics or rigid plates. In general, the individual fabric plies are saturated with binder solutions, for example phenolic resin solutions, for this purpose.
DE-A 3426458, however, discloses that this approach will wet through the aramid fibers which therefore have distinctly worse stopping power. This reference therefore proposes using crosslinkable thermoplastic polymers in high viscosity solution or dispersion or as a fusible fiber so as to avoid impregnating the fiber. Fusible fibers have the disadvantage of having to be mixed in before the fabrics which are to be consolidated are produced and of not providing rigid articles. The stopping power from binding with solutions or dispersions was unsatisfactory.
SUMMARY OF THE INVENTION
Against this background, it is an object of the present invention to provide ballistic-resistant fiber materials providing improved stopping power as compared with the prior art.
It has been determined, surprisingly, that higher ballistic resistances are obtained when crosslinkable thermoplastic polymers are applied in powder form to the aramid fibers.
The present invention accordingly provides for a method of using crosslinkable polymer powders for producing ballistic-resistant fiber materials, which comprises consolidating the textile sheet materials by means of pulverulent crosslinkable which are based on copolymers ethylenically unsaturated monomers and have a glass transition temperature Tg or a melting point of ≧40° C. and a melt viscosity of ≧200 mPas.
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Derwent Abstract corresponding to EP 0 597 165 (AN 1994-160293), May 1984.
Derwent Abstract corresponding to DE 29 27 653 (AN 1981-07879D), Jan. 1981.
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Hashemzadeh Abdulmajid
Kohlhammer Klaus
Burgess, Ryan & Wayne
Cameron Erma
Moran William R.
Wacker-Chemie GmbH
Wayne Milton J.
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