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US 6,916,354 B2Granted
Tungsten/powdered metal/polymer high density non-toxic composites
AssigneeInternational Non-Toxic Composites Corp.
InventorKenneth H. Elliott
Life of this patent
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Abstract
Tungsten/polymer composites comprising tungsten powder, another metal powder having a high packing density, and organic binder have high density, good processibility and good malleability. Such composites are useful as lead replacements, particularly in the manufacture of shot.
Claims33
A composite comprising:
- tungsten powder having a mean particle size of 0.5-50 μm;
- another metal powder having a mean particle size of 1-50 μm and having a packing density of 62 vol % or greater, and, a thermoplastic elastomer selected from the group consisting of polyether block amides, polyester elastomers, melt processible rubber, chlorinated polyethylene, ethylene propylene diene monomer rubber, polyamide elastomers, polyolefin elastomers, thermoplastic polyurethanes and blends thereof.
A finished article of manufacture comprising an unsintered composite comprising:
- tungsten powder having a mean particle size of 0.5-50 μm;
- another metal powder having a mean particle size of 1-50 μm and having a packing density of 62 vol % or greater;
- and, a thermoplastic elastomer selected from the group consisting of polyether block amides, polyester elastomers, melt processible rubber, chlorinated polyethylene, ethylene propylene diene monomer rubber, polyamide elastomers, polyolefin elastomers, thermoplastic polyurethanes and blends thereof.
A finished article of manufacture composing an unsintered composite consisting essentially of:
- 80-96 wt % milled tungsten powder having a mean particle size of 2-20 μm;
- 2-15 wt % bronze powder or stainless steel powder having a mean particle size of 1-40 μm and a packing density of 62 vol % or greater, the bronze having a 90:10 ratio of Cu:Sn;
- and,
- 2-6 wt % organic binder consisting essentially of
- a thermoplastic elastomer selected from the group consisting of polyether block amides, polyester elastomers, melt processible rubber, chlorinated polyethylene, ethylene propylene diene monomer rubber, polyamide elastomers, polyolefin elastomers, thermoplastic polyurethanes and blends thereof,
- a rheology modifier,
- a strength enhancing agent, and
- a surfactant.
5 more elements
Dependencies are inferred from the claim text.