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US 10,647,911 B2Granted
Coated particles, methods for their manufacture and for their use as proppants
AssigneeCovestro LLC
InventorsStephen J. Harasin, Kenneth R. Riddle, Michael T. Wellman
Life of this patent
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Abstract
Disclosed are coated particles. The coated particles include substrate particles and a coating disposed over at least a portion of the substrate particles. The coating includes a condensation reaction product of a reaction mixture that includes a liquid isocyanate-functional component and an isocyanate-reactive composition. Also disclosed are methods for making such particles and methods for using such particles as proppants in hydraulic fracturing.
Claims10
Coated particles comprising:
- (a) substrate particles having a particle size of no more than 3 mesh;
- and
- (b) a coating disposed over at least a portion of the particles, wherein the coating comprises a condensation reaction product of a reaction mixture comprising:
- (i) a methylene diphenyl diisocyanate mixture comprising at least 10 percent by weight of 2,4′-methylene diphenyl diisocyanate and/or 2,2′-methylene diphenyl diisocyanate, based on the total weight of the mixture;
- and
- (ii) an isocyanate-reactive composition comprising:
- (A) a plant oil polyester polyol;
- (B) an aromatic diamine;
- and
- (C) a catalyst for the reaction between hydroxyl groups and isocyanate groups, wherein the plant oil polyester polyol is present in an amount of at least 60% by weight, based on the total weight of isocyanate-reactive components present in the isocyanate-reactive composition and the aromatic diamine is present in an amount of 10 to 40% by weight, based on the total weight of the total weight of isocyanate-reactive components present in the isocyanate-reactive composition.
7 more elements
Dependencies are inferred from the claim text.