Patent ID: 6649713
Filing Date: 2003-11-18
Classification: C08F,Y10S

Abstract:
A process for preparation of a nanocomposite comprising a polyolefin component and inorganic components by in-situ polymerization, comprising:a) preparation of a layered organo-metal compound: a layered metal compound is mixed with deionized water to form an 0.5 wt %-10 wt % aqueous suspension, the suspension is then mixed with an aqueous solution of a long-chain alkyl ammonium salt in deionized water to form the layered organo-metal compound which is then dried in air at room temperature for 10-40 h, in which the amount of the long-chain alkyl ammonium salt is, 1-2 times exchange value of the layered metal compound in weight ratio; b) treatment of layered organo-metal compound with aliphatic amine: to the dried layered organo-metal compound, an aliphatic amine is added and the mixture is stirred at 10-50Â° C. for 20-60 min, the mole ratio of the layered organo-metal compound and the aliphatic amine is in the range of 1:2-1:20; c) filling silica or titanium dioxide precursor into the aliphatic amine-treated layered organo-metal compound: the silica or titanium dioxide precursor is added into the layered organo-metal compound treated with aliphatic amine, and the mixture is stirred at 10-50Â° C. for 3-6 h, in which the mole ratio of the precursor and aliphatic amine is 8:1-10:1; the precipitate is collected, and then dried in air at room temperature for 12-24 h and dried again at 100-300Â° C.; d) to the dried product said above, 10-30 ml/g of alkyl aluminum or alkoxy aluminum is added under the atmosphere of an inert gas and treated at 20-80Â° C. for 12-24 h, the treated product is then washed with inert hydrocarbon solvent to remove the excess alkyl aluminum or alkoxy aluminum, thus a catalyst carrier is obtained; e) loading metallocene catalyst into the carrier: to the resulting carrier, a solution of metallocene catalyst in toluene is added at 20-80Â° C. in an amount of 10-40 ml for each gram of the carrier, and the unloaded metallocene catalyst is washed away by toluene; f) olefin polymerization: the loaded catalyst prepared above is put into a polymerization vessel and ethylene or propylene monomer is passed in, alkyl aluminoxane is used as the co-catalyst to carry out the olefin polymerization at 60Â° C., a solution of HCl in ethanol is used to terminate the reaction.