Patent · US Expired

Preparation of mixtures of high molecular weight polyisobutylene and thermoplastic polymers

US5712341A · kind A · utility

2Cited by

5References

9Claims

0Family size

Assignee

BASF SE

Inventors

Jurgen Hofmann · Spalt, DE
Thomas Kessler · Schifferstadt, DE
Bernd Lothar Marczinke · Frankfurt, DE
Sibylle Brosius · Ludwigshafen, DE
Karl-Heinz Fauth · Wattenheim, DE

Key dates

Filing date	Sep 19, 1995
Grant date	Jan 27, 1998
Priority date	—
Expiry date	Sep 19, 2015

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08J2323/02
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

Mixtures of high molecular weight polyisobutylene and thermoplastic polymers are prepared in an extruder by a process in which meterable, high molecular weight polyisobutylene is first metered into the extruder and homogenized in at least one kneading stage, heated and subjected to controlled molecular weight degradation and the thermoplastic polymer is then introduced into the polyisobutylene melt by means of a side feed and is subsequently homogenized together with said melt. The novel process is particularly suitable for the preparation of mixtures of high molecualr weight polyisobutylene and polyethylene.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.