Process for finishing polyolefins

• US 3,066,130 A
• Filed: 09/26/1956
• Issued: 11/27/1962
• Est. Priority Date: 10/08/1955
• Status: Expired due to Term

• Current Assignee: Herbert Bestian, Sommer Siegfried, Werner Grundmann
• Original Assignee: Herbert Bestian, Sommer Siegfried, Werner Grundmann
• Inventors: Grundmann, Werner, HERBERT BESTIAN, Siegfried, Sommer
• Application Number:
  US03/612,099
• Time in Patent Office: 2,253 Days
• US Class Current: 528/496
• CPC Class Codes: C08F 6/02 Neutralisation of the polymerisation mass, e.g. killing the catalyst short-stopping C08F2/42 also removal of catalyst residues
• CPC Class Codes: C08L 23/02 not modified by chemical after-treatment

Claims

1. A PROCESS FOR REMOVING SOLID CATALYST RESIDUES FROM A SUSPENSION OF A SOLID POLYOLEFIN IN AN ALIPHATIC HYDROCARBON DISPERSANT, SAID POLYMER HAVING BEEN PREPARED BY THE LOW PRESSURE POLYMERIZATION OF AN OLEFIN IN A CATALYST SYSTEM CONSISTING OF (1) A METALLO-ORGANIC COMPOUND OF AN ELEMENT OF GROUPS I-III OF THE PERIODIC TABLE AND (2) A COMPOUND OF A METAL OF SUB-GROUPS IV-VI OF THE PERIODIC TABLE, WHICH COMPRISES ADDING TO SAID SUSPENSION ABOUT 0.5-5% BY VOLUME, BASED ON THE DISPERSANT, OF A MONOHYDRIC ALCOHOL, HEATING THE MIXTURE TO A TEMPERATURE OF ABOUT 40* TO 100*C. TO DISSOLVE THE CATALYST RESIDUES, AND THEN EXTRACTING THE WHOLE OF SAID MIXTURE WITH WATER WHEREBY THE CATALYST RESIDUES ARE TRANSFERRED IN SOLUTION TO THE AQUEOUS PHASE.