Polymeric Plugging Composition
AssigneeWillamette Valley Company
InventorNathan E. Werst
Life of this patent
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Abstract
A polymeric composition for restoring a previously formed spike hole in a wood railroad tie is described. The polymeric composition comprises a resin comprising a chain extender in a concentration of at least about 10 wt % and at least one polyol, and at least one isocyanate-containing compound. The chain extender may be diethylene glycol. The composition may also include a moisture control additive in a concentration of at least 5 wt % of the resin.
Claims35
A polymeric composition for restoring a previously formed spike hole in a wood railroad tie, comprising
- a resin comprising a chain extender in a concentration of at least about 10 wt % and at least one polyol, and
- at least one isocyanate-containing compound,
- wherein the polymeric composition has a polyurethane index of less than or equal to 1.3.
A polymeric composition for restoring a previously formed spike hole in a wood railroad tie, comprising
- a resin comprising diethylene glycol and at least one additional polyol, and
- at least one isocyanate-containing compound,
- wherein the polymeric composition has a polyurethane index of less than or equal to 1.3.
A polymeric composition for restoring a previously formed spike hole in a wood railroad tie, comprising
- a resin comprising at least one polyol and at least 5 wt % moisture control additive;
- and
- at least one isocyanate-containing compound,
- wherein the polymeric composition has a polyurethane index of less than or equal to 1.3.
A polymeric composition for restoring a previously formed spike hole in a wood railroad tie, comprising
- a resin comprising at least one polyol and at least one isocyanate-containing compound,
- wherein the polymeric composition has a spike withdrawal resistance ratio of ≥0.9, wherein the spike withdrawal resistance ratio is the maximum force required to extract a railroad spike from the polymeric composition disposed in the previously formed spike hole divided by the maximum force required to extract a railroad spike directly from the same wood railroad tie, and
- wherein the polymeric composition has a viscosity of ≤70 Pa/s at temperatures as low as −20° C. and a shear rate of 1/s.
A polymeric composition for restoring a previously formed spike hole in a wood railroad tie, comprising
- a resin comprising at least one polyol and at least one isocyanate-containing compound,
- wherein the polymeric composition has a spike withdrawal resistance ratio of ≥0.9, wherein the spike withdrawal resistance ratio is the maximum force required to extract a railroad spike from the polymeric composition disposed in the previously formed spike hole divided by the maximum force required to extract a railroad spike directly from the same wood railroad tie, and
- wherein the polymeric composition has a viscosity of ≤50 Pa/s at temperatures as low as −20° C. and a shear rate of 50/s.
A polymeric composition for restoring a previously formed spike hole in a wood railroad tie comprising at least one polyol, wherein the polymeric composition has flowability at −5° C. of ≥1 gallon per minute.
A polymeric composition for restoring a previously formed spike hole in a railroad tie, comprising
- a resin component, wherein the resin component comprises at least one polyol and a low molecular weight diol in a concentration of at least about 10 wt % relative to the total weight of resin component, and
- at least one isocyanate-containing compound,
- wherein the polymeric composition has a polyurethane index of less than or equal to 1.3.
A polymeric composition for restoring a previously formed spike hole in a wood railroad tie comprising a resin comprising a low molecular weight diol in a concentration of at least about 10 wt % and at least one additional polyol, wherein the polymeric composition attains a hardness measurement that is at least 75% of final hardness at ambient temperature in less than 30 minutes.
Dependencies are inferred from the claim text.