Coated and cured proppants
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United States of America Patent
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Mar 31, 2015
Grant Date -
Nov 8, 2012
app pub date -
May 3, 2011
filing date -
May 3, 2011
priority date (Note) -
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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.
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