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US 2004/0175563 A1Published application
Thick thermoplastic composites
OwnerC. Albert Okersoninventor
Life of this patent
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Abstract
A thick thermoplastic composite extrusion such as a railroad crosstie, marine piling, timber (such as a bridge timber), utility pole, highway guardrail, highway guardrail post, residential or marine decking material, fence post, fence rail, or house siding which is fabricated from a mineral filled thermoplastic composition.
Claims33
A large, elongated polymeric composite, comprising:
- a central longitudinal axis;
- and consisting essentially of about 35% to about 65% by weight of a thermoplastic resin, about 25% to about 45% by weight of talc, and a filler;
- the composite being substantially free of voids and at least about 3 feet in length and at least about 0.5 inches in diameter from the central longitudinal axis to an outer surface of the sheath.
A thermoplastic composite, comprising:
- (a) about 35% to about 65% of a thermoplastic resin selected from the group consisting of low-density polyethylene, high-density polyethylene, linear polyethylene, polypropylene, and blends thereof and (b) about 40% to about 60% by weight of a talc blend;
- the core and sheath being substantially free from shrinkage voids;
- and
- the core and sheath forming an elongated composite at least about 3 feet in length.
1 more element
A thermoplastic composition, consisting essentially of:
- a reclaimed thermoplastic resin in an amount of from about 35% to about 65% by weight of the composition, selected from the group consisting of low-density polyethylene, high-density polyethylene, linear polyethylene, polypropylene, and blends thereof;
- talc particles in at least about 25% to about 40% by weight of the composition;
- and
- additives in an amount of from about 15% to about 40% by weight of the composition selected from the group consisting of calcium carbonate, mica, marble dust, graphite, aluminum flake, diatomaceous earth, cement dust, clay, feldspar, silica, glass, fumed silica, silicates, alumina, magnesium oxide, antimony oxide, zinc oxide, barium sulfate, aluminum silicate, calcium silicate, titanium oxides, glass micro spheres, wollastonite, nephelene syenite, calcium sulfate, gypsum, chalk, carbon black, and blends thereof. In embodiments of the present invention where a talc blend is used, the filler (mineral filler) content is about 15% by weight to about 40% by weight. In other embodiments, the total filler is present in a range of from about 40% to about 60%. The talc blend content may range from about 30%-40% (by weight), and in other embodiments about 40%-60% (by weight).
1 more element
Dependencies are inferred from the claim text.