Dry, surface-modified nanocalcite

摘要

Nanoparticle compositions including calcite and a surface-modifying agent bonded to the calcite are described. The surface-modifying agent includes a binding group bonded to the calcite and a compatiblizing segment. The compatiblizing segment includes at least one of a polyethylene oxide, a polypropylene oxide, a polyester, a polyamide, or a combination thereof. The composition includes less than 2 wt. % solvents and/or resins. Methods of preparing nanoparticle compositions are also described.

主权项

1. A method of making a particle-filled resin, the method comprising:
(a) surface-modifying calcite particles to form surface-modified particles; (b) drying the surface-modified particles; and (c) dispersing the dried, surface-modified particles in a resin without milling and without addition of solvent to form the particle-filled resin; wherein (a) is achieved by one of the following: (a1) wet milling unmodified calcite particles and subsequently contacting the milled calcite particles with a surface-modifying agent; (a2) contacting unmodified calcite particles with a surface-modifying agent and subsequently wet milling the contacted particles; and (a3) wet milling a mixture of unmodified calcite particles and a surface-modifying agent; wherein the wet milling of (a1), (a2), and (a3) reduces the size of the calcite particles to a mean size of no greater than 400 nm, as measured by laser diffraction of a 1% solids solution in acetone, using an optical model with a refractive index of 1.6000 for calcite and 1.3591 for acetone; and wherein the mean size of the surface-modified particles of the particle-filled resin is no greater than 400 nm.