| abstract |
PURPOSE: To provide prepare a polypropylene wax having low hardness by copolymerizing propylene with other olefin in the presence of a specified metallocene catalyst. n CONSTITUTION: Propylene in an amt. of 70 to 99.9 wt.% based on the total amt. of the monomers, 0.1 to 30 wt.% ethylene, and a compd. selected from 4C or higher olefins represented by the formula (R 15 and R 16 represent H, a 1-28C alkyl or the like) are subjected to soln., suspension, or gas phase polymn. at a temp. of -60 to 200°C and a pressure of 0.5 to 120 bar in the presence of H as an mol.wt. regulator and a catalyst comprising a metallocene and an aluminoxane to prepare a polypropylene wax which has an mol.wt. M w of 1000 to 50000 g/mol, a polydispersibility M w /M n of 1.8 to 5.0, a viscosity number of 2 to 60 cm 3 /g, an m.p. of 50 to 150°C, a melt enthalpy ΔH of not more than 100 J/g, and a dropping point of 60 to 160°C, a melt viscosity of 100 to 20,000 mPa.s at 170°C and wherein copolymerizable monomer units are regularly distributed in the polymer chain and the average block length is not more than 1.25. n COPYRIGHT: (C)1991,JPO |