| 摘要 |
#CMT# #/CMT# Use of calcium carbonate nanoparticles, having average equivalent spherical diameter of 70-0.5 nm, which is measured by small angle X-ray scattering, as a filler in transparent polymeric compositions. #CMT# : #/CMT# Independent claims are included for: (1) a transparent polymeric composition comprising at least a polymer containing in-built calcium carbonate nanoparticles; and (2) a process of preparing the compositions comprising preparation of the particles i.e. preparing an aqueous phase emulsion (I) in an organic phase, where the emulsion contains a surfactant derivative and a calcium ion source, optionally preparing an aqueous phase emulsion in an organic phase, where the emulsion contains a surfactant derivative and a carbonate ion source, mixing (I) with carbon dioxide or mixing (I) with the obtained emulsion of the previous step, distilling the mixture obtained from the mixing to separate the mixture to a light and a heavy fractions of the nanoparticles and recovering the heavy fraction, precipitating the heavy fraction nanoparticles, separating and drying the precipitated nanoparticles to obtain powder and optionally dispersing the powder in an organic solvent, mixing the powder with a polymer, optionally mixing the powder with a monomer and polymerization of the mixture. #CMT#USE : #/CMT# The calcium carbonate nanoparticles are useful as filler in transparent polymeric compositions (claimed), as glass material in automobile and optics in place of glass. #CMT#ADVANTAGE : #/CMT# The calcium carbonate nanoparticles provide: good resistance to scratch, shocks and UV rays; has good tensile strength and good thermal stability; and has excellent transparency and improved comfort for the user. #CMT#INORGANIC CHEMISTRY : #/CMT# Preferred Components: The calcium carbonate nanoparticles are present at 90 wt.% with 90-110% of the particles exhibit the measured average equivalent spherical diameter. The nanoparticles are present aggregate form with the greatest dimension of >=10 nm to =40 mu m, preferably 5-10 nm, which is measured by the electronic microscope scanning. The aggregate contain an organic derivative. The organic derivative is present at 0.01-90 wt.%. #CMT#POLYMERS : #/CMT# Preferred Process: The mixing process is done during a process of polymer shaping such as extrusion, injection, molding and calendaring. The precipitated calcium carbonate nanoparticles are incorporated at a rate of greater than 0.5 wt.% in the polymer. Preferred Components: The polymer is polyolefins, vinyl polymers, epoxy resins, silicones, polyurethanes, polyamides, saturated and unsaturated polyesters, polysulfones, cellulosic polymers, aminoplasts, polycarbonates, alpha olefin copolymers and vinyl monomer and/or terpolymers. The polyolefins are polymethylpentene, polystyrene or natural or synthetic rubbers. The copolymers contain cyclic olefins. The vinyl polymers are polyvinyl chloride, polyvinyl acetate and/or polymethylmethacrylate. The silicone is a modified silicone. The saturated polyester is ethylene polyterephthalate. The alpha-olefin copolymers and vinyl monomer are ethylene-alcohol vinyl copolymers, styrene-acrylonitrile copolymers and methyl styrene-methacrylate copolymers. The terpolymer is acrylonitrile-butadiene-styrene copolymer. #CMT#EXAMPLE : #/CMT# Benzene tetracosyl sulfonic acid (46.5 g) was mixed with toluene (46 g), methanol (26.6 g) and Exxsol D80 (RTM: A petroleum distillate) (60 g). The mixture was agitated at ambient temperature for 15 minutes. Slaked lime (10 g) and methanol (1 ml) were added to the obtained mixture. Then carbon dioxide was passed directly in to the mixture and agitated for 55 minutes. After 75 minutes slaked lime (10 g) was again introduced and the process was repeated. Exxsol D80 (RTM: A petroleum distillate) (40 ml) was added and the process was repeated, where the step of carbon dioxide passage was maintained for 3 hours and methanol (1 ml) was added every hour to obtain a very viscous brown/black liquid and kept for 72 hours to give a white deposit and a supernatant solution. The supernatant solution was centrifuged twice at 30-2000 rpm. The obtain supernatant was worked up to give the calcium carbonate nanoparticles. |
