| 摘要 |
An unsaturated ethylene polymer and a method for the preparation thereof are disclosed. The unsaturated ethylene polymer is prepared by low-pressure polymerisation of ethylene and at least one monomer which is copolymerisable therewith and includes a polyunsaturated comonomer having 8-14 carbon atoms and at least two non-conjugated double bonds, of which at least one is terminal. Conveniently, the polyunsaturated comonomer is an alpha , omega -alkadiene, preferably 1,9-decadiene. A vinylically unsaturated monomer, preferably 1-butene, may additionally be added in the polymerisation. Polymerisation is performed by means of a chromium catalyst which is based on chromium trioxide or chromate and is supported by a carrier, such as silica, and which is unmodified or modified by titanation or fluoridation. |
