Powder comprising polymer-coated inorganic particles

摘要

Composite particles comprising core particles completely or partially coated with a precipitated polymer, where the d50 median diameter of the core particles is from 1 to 70 μm and wherein the core particle is an inorganic material which does not include titanium dioxide are provided. A method to prepare the particles includes dissolution of a polymer in a solvent and precipitation of the polymer in the presence of a suspension of the core particles. Further provided is a layer by layer moulding process employing the composite particles and mouldings obtained therefrom.

主权项

1. A powder, comprising composite particles:
wherein the composite particles, comprise: an inorganic core particle having a d50 median diameter of from 1 to 70 μm; and at least a partial coating of a precipitated polymer on the core; wherein the d50 median diameter of the composite particles is from 20 to 150 μm, a ratio of a d50 median diameter of the composite particles to the d50 median diameter of the core particles is from 1.15 to 30, a thickness of the at least partial precipitated polymer coating of the composite particle is 1.5 μm or greater, the melting point of the polymer in a first heating procedure is greater than in a second heating procedure, as measured by differential scanning calorimetry (DSC), the inorganic core particle is at least one material selected from the group consisting of a polyphosphate, a phosphinate, boron carbide and a ceramic, the precipitated polymer of the coating comprises at least one polymer selected from the group consisting of a polyolefin, a polyethylene, a polypropylene, a polyvinyl chloride, a polyacetal, a polystyrene, a polyimide, a polysulphone, a poly(N-methylmethacrylimide) (PMMI), a polymethyl methacrylate (PMMA), a polyvinylidene fluoride (PVDF), an ionomer, a polyether ketone, a poly aryl ether ketone, a polyamide, and a copolyamide, the inorganic core particle material does not include titanium dioxide, and a melting point of the coating polymer is obtainable when the polymer is exposed to an electromagnetic energy.