Composite Material Based on Polyamide and Submicronic Mineral Particles: No. 7,105,230.

Composite Material Based On Polyamide And Submicronic Mineral Particles: No. 7,105,230; Dominique Dupuis, Patrice Lacombe and Joel Varlet, assignors to Rhodia Chimie, Aubervilliers, France. Filed 3/21/01. Issued 9/12/06.

Composite material comprising a matrix based on polyamide and mineral submicron particles has been patented. The polyamide is obtained by polycondensation of a diamine with a dicarboxylic acid. The particles comprise a silica-based core and an at least a discontinuous layer of an oxide, hydroxide or hydrated oxide of zirconium, whose isoelectric point is greater than that of the core. The particles are free of a silane coupling agent.