Stabilisierte Suspensionen von anorganischen Nano-Partikeln

EP 1947141 A1 UPAB: 20081110 NOVELTY - Inorganic particles suspension comprises an outer phase comprising polymerizable monomers, oligomers and/or pre-polymers and one or more co-polymerizable or non co-polymerizable organic acids; and a dispersed phase comprising surface modified and/or non-surface modified inorganic particles, where the inorganic particles have an average particle size of 200 nm, preferably 100 nm. DETAILED DESCRIPTION - Inorganic particles suspension comprises an outer phase comprising polymerizable monomers, oligomers and/or pre-polymers and one or more co-polymerizable or non co-polymerizable organic acids; and a dispersed phase comprising surface modified and/or non-surface modified inorganic particles, where the inorganic particles have an average particle size of 200 nm, preferably 100 nm, and the type and the amount of the co-polymerizable or non-co-polymerizable organic acid and/or acid is selected so that the surface modified or non-surface modified inorganic particle is stabilized after mixing of 1 part/wt of hexamethylene-diisocyanate-biuret with 1 part/wt of the suspension against accumulation of particles with an average particle size of at least 1000 nm. INDEPENDENT CLAIMS are included for: (1) a preparation of the suspension comprising providing pre-suspension comprising the outer phase and the dispersed phase comprising surface modified and/or non-surface modified inorganic particles, and mixing the provided pre-suspension with the co-polymerizable or not co-polymerizable organic acids or acid anhydrides; and (2) a partly or completely cured dispersion, producible by polymerization of the polymerizable monomers, oligomers and/or pre-polymers, and/or the radically polymerizable monomers, oligomers and/or pre-polymers of the suspension. USE - The co-polymerizable or non co-polymerizable organic acid is useful as a stabilizer to stabilize the surface modified and/or non-surface modified silicon dioxide particles against the accumulation in the suspension, or the surface modified and/or non-surface modified inorganic nano-particle against the accumulation in the suspension. The suspension is useful in lacquer system, preferably clear lacquer systems and pigmented lacquer systems (all claimed). The suspension is useful in automobile lacquering. ADVANTAGE - The suspension is stable against the accumulation of the particles. The inorganic acid in the suspension has increased tensile strength and impact strength, improved scratch and abrasion resistance, and reduced thermal hardening expansion. The suspension is devoid of turbidity