Method for coating particulate material thereof
AssigneeExxon Production Research Company
InventorClaude E. Cooke, Jr.
Life of this patent
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Abstract
A Method of coating particulate materials (such as silica sand, glass beads, seeds and metal particles) with a liquid thermosetting epoxy resin which comprises agitating the epoxy resin with the particles in a nonpolar liquid, which is immiscible with the epoxy resin, and contains a nonionic surfactant having a molecular weight of at least 2,000 to retard the tendency of the epoxy coated particles to agglomerate during curing of the resin in the non-polar liquid. A suitable liquid for use as the immiscible liquid is a paraffinic oil which is aromatic-free and olefin-free.
Claims17
A method of forming free-flowing resin-coated particles which comprises:
- a. coating the particles of a particular substrate material with a liquid thermosetting epoxy resin;
- b. in the presence of a curing agent capable of curing said epoxy resin to a solid infusible state, agitating said coated particles in a nonpolar liquid immiscible with said liquid resin and containing a nonionic surfactant having a molecular weight of at least 2000 which retards agglomeration of said resin coated particles until said epoxy resin cures to a solid, infusible state;
- and thereafter
- c. removing the coated particles from said immiscible liquid.
A method of coating particulate material with a resin to form free-flowing, non-sticky, resin-coated particles which comprises:
- a. mixing said particulate material with a liquid thermosetting epoxy resin and a curing agent for said epoxy resin to deposit a coating which substantially covers each particle;
- b. curing said coated particles in contact with a nonpolar liquid immiscible with said resin and a minor amount of a nonionic surfactant having a molecular weight of at least 2000 until said resin cures to a hard, infusible state, said surfactant having the ability to retard agglomeration of said resin-coated particles;
- and thereafter
- c. removing said bath liquid containing said surfactant.
Dependencies are inferred from the claim text.