Coated and cured proppants
AssigneePreferred Technology, LLC
InventorsRobert Ray McDaniel, Avis Lloyd McCrary
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Abstract
Solid proppants are coated with a phenol-urethane coating in one or more layers by a method comprising coating a proppant solid and then curing the coated proppant under conditions sufficient to substantially cure said proppant, wherein said coating comprises a substantially homogeneous mixture of (i) an isocyanate component having at least 2 isocyanate groups, (ii) an amine reactant, and optionally (iii) an amine that is a latent curing agent for said isocyanate.
Claims19
1-24. (canceled)
A coated proppant solid comprising a solid proppant core particle substantially covered with an isocyanate-polyol condensation reaction product, wherein the polyol is a hydroxy-functional polyether and the NCO-groups in the isocyanate component is in an access from about 30% to less than 100%, relative to the OH-groups in the polyol component.
Dependencies are inferred from the claim text.