Polyisobutene composition

US7049383B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Heinz Auer · Neulußheim, DE
• Dirk Borchers · Birkenheide, DE
• Thomas Wettling · Schifferstadt, DE

Key dates

• Filing date: Jul 2, 2002
• Grant date: May 23, 2006
• Expiry date: Sep 13, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F110/10
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A polyisobutene composition having a global maximum of the differential molecular weight distribution curve at a molecular weight Mmax of from 3 500 to 8 000 is described, which comprises at least one local maximum at a molecular weight of from 112 to 560. The isobutene oligomers present act as flow improvers and boiling assistants. They are added to higher molecular weight isobutene polymers, preferably before or in the course of a distillation, for removing unconverted isobutene and/or an inert diluent.