This patent application has not been assigned to a company or institution.
The following quote was obtained by the news editors from the background information supplied by the inventors: "
In addition to the background information obtained for this patent application, VerticalNews journalists also obtained the inventors' summary information for this patent application: "One embodiment of the present invention is a composition comprising at least one urethane based polymer or pre-polymer and at least a portion of discrete carbon nanotube molecular rebar to form or polymerize into a polyurethane/molecular rebar formulation.
"Another embodiment is a composition comprising at least one urethane based polymer or pre-polymer and at least a portion of discrete carbon nanotube molecular rebar, wherein the urethane polymer or pre-polymer comprises at least one polyol and/or at least one cyanate, and wherein the discrete carbon nanotube molecular rebar is contacted with at least one of the polyol, the urethane polymer or pre-polymer.
"Preferably the discrete carbon nanotube molecular rebar is contacted with the polyol. The discrete carbon nanotubes can be contacted with the polyol prior to, during and/or after polymerization. The discrete carbon nanotube molecular rebar can be contacted with the cyanate prior to, during and/or after polymerization.
"The cyanate can comprise aromatic or aliphatic groups, preferably hexamethylene diisocyanate, more preferably toluene diisocyanate or most preferably diphenylmethane diisocyanate.
"The portion of discrete carbon nanotubes can be open ended, resulting from dissolving catalyst particles integral to the initially closed carbon nanotubes.
"The composition can further comprise at least one polymer other than urethane polymer or prepolymer. The polymer can be selected from the group consisting of vinyl polymers, preferably poly(styrene-butadiene), partially or fully hydrogenated poly(styrene butadiene) containing copolymers, functionalized poly(styrene butadiene) copolymers such as carboxylated poly(styrene butadiene) and the like, poly(styrene-isoprene), poly(methacrylic acid), poly(acrylic acid), poly(vinylalcohols), and poly(vinylacetates), fluorinated polymers, preferably poly(vinylidine difluoride) and poly(vinylidene difluoride) copolymers, conductive polymers, preferably poly(acetylene), poly(phenylene), poly(pyrrole), and poly(acrylonitrile), polymers derived from natural sources, preferably alginates, polysaccharides, lignosulfonates, and cellulosic based materials, polyethers, polyesters, polyurethanes, and polyamides, either as graft, block or random copolymers, and mixtures thereof.
"The carbon nanotubes can be further functionalized, preferably comprising a molecule of mass greater than 50 g/mole and more preferably comprising carboxylate, hydroxyl, ester, ether, or amide moieties, or mixtures thereof.
"The discrete carbon nanotubes can have a residual metals level of less than about 4% by weight of the carbon nanotubes. The carbon nanotube fibers can comprise an oxidation content from about 1 weight percent to about 15 weight percent. The discrete carbon nanotube fibers comprise from about 0.1 weight percent to about 90 weight percent, preferably from about 0.5 to about 49 weight percent of the composition.
"The composition can be in the form of free flowing particles.
"The composition can comprise additional inorganic structures. The additional inorganic structures can comprise elements selected from the groups two through fourteen of the Periodic Table of Elements, preferably wherein the elements are selected from the group consisting of silver, gold, silicon, vanadium, titanium, chromium, iron, manganese, tin, nickel, palladium, platinum, cobalt, aluminum, gallium, germanium, indium, antimony, copper and zinc, cadmium, mercury, or mixtures thereof including oxides and other derivatives. The additional inorganic structures can also comprise non-fiber carbon structures, such as components selected from the group consisting of carbon black, graphite, graphene, oxidized graphene, fullerenes and mixtures thereof.
"Another embodiment of the invention is a foam comprising the inventive formulations, wherein the foam at a given density has increased rigidity, increased strength, improved ability to form foams, improved crush resistance, and improved static electricity transmission, compared to a formulation in the absence of discrete carbon nanotube molecular rebar.
"A further embodiment is an adhesive comprising the formulations, wherein the adhesive has improved adhesion and cohesion and improved electrical properties versus a comparison adhesive made with an absence of discrete carbon nanotube molecular rebar.
"A fourth embodiment is a cement comprising molecular rebar, wherein the cement has improved crack resistance, preferably with improved adhesion to other materials placed in contact with the cement compared to the cement without molecular rebar. The cement comprising molecular rebar is especially useful in the oil and gas drilling and processing industry, nuclear energy generation industry, mining and power generation industries. Mortar comprising the cement of the inventive formulations for cement blocks and rocks resists cracking and crumbling which insure longer life compared to a mortar without molecular rebar.
"Another embodiment is a process to form a composition comprising polyurethane/discrete carbon nanotube molecular rebar formulation comprising the steps of:
"a) selecting discrete carbon nanotube fibers having an aspect ratio of from 10 to 500,
"b) selecting discrete carbon nanotube fibers having an oxidation level from about 1 to about 15% by weight,
"c) selecting discrete carbon nanotubes wherein at least a portion of the tubes are open ended,
"d) blending the discrete carbon nanotube fibers with a urethane polymer or prepolymer to form a urethane/discrete carbon nanotube carbon fiber mixture,
"e) optionally polymerizing the urethane/fiber mixture with a polyol and/or a cyanate to form a polyurethane/molecular rebar formulation,
"f) optionally combining the urethane/discrete carbon fiber nanotube mixture with additional inorganic structures, and
"g) optionally agitating or sonicating, preferably sonicating, the urethane/discrete carbon fiber nanotube mixture to a degree sufficient to disperse the fibers.
BRIEF DESCRIPTION OF DRAWINGS
"The following drawings form part of the present specification and are included to further demonstrate certain aspects of the present invention. The invention may be better understood by reference to one or more of these drawings in combination with the detailed description of specific embodiments presented herein.
"FIG. 1 shows a high magnification optical photograph of molecular rebar 1 (discrete carbon nanotubes) dispersed in polyethylene oxide. The polyethylene oxide has crystallized exhibiting well-known spherulites. The discrete carbon nanotubes of this invention are located essentially at the boundary of the crystalline-amorphous region and within the amorphous (non-crystalline fraction) as illustrated by the arrow 1 in the figure. Arrow 2 shows the crystalline lamellar arm of the spherulite."
URL and more information on this patent application, see: Bosnyak,
Keywords for this news article include: Alkenes, Patents, Styrenes, Urethane, Alkadienes, Butadienes, Carbamates, Fullerenes, Hydrocarbons, Nanotechnology, Carbon Nanotubes, Benzene Derivatives, Emerging Technologies.
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