| C | CHEMISTRY; METALLURGY |
| 08 | ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON |
| F | MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS |
| 4 | Polymerisation catalysts |
| 42 | Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors |
| 44 | selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides |
| 60 | together with refractory metals, iron group metals, platinum group metals, manganese, rhenium ; technetium; or compounds thereof |
| 62 | Refractory metals or compounds thereof |
| 64 | Titanium, zirconium, hafnium or compounds thereof |
| 65 | Pretreating the metal or compound covered by group C08F4/64 before the final contacting with the metal or compound covered by group C08F4/44 |
| 652 | Pretreating with metals or metal-containing compounds |
| 654 | with magnesium or compounds thereof |
