公开(公告)号：US10221255B2

公开(公告)日：2019-03-05

申请号：US15735007

申请日：2016-06-15

Applicant: BASF SE

Inventor： Ann-Kathrin Marguerre ,  Christian Raith ,  Christof Kujat ,  Friedrich-Georg Martin ,  Daher Michael Badine ,  Karolin Geyer ,  Ansgar Schaefer ,  Nikolaus Nestle ,  Murat Cetinkaya ,  Eduard Schreiner ,  Reiner Weiler ,  Peter Zurowski

IPC: C08F2/42 ,  C08F2/38 ,  C07C51/50

Abstract: A composition for the immediate stopping of a free-radical polymerization comprises a) an inhibitor for the free-radical polymerization selected from among phenothiazines, b) an aprotic solvent and c) an ionic liquid. It serves to stabilize free-radically polymerizable monomers against free-radical polymerization. For the immediate stopping of free-radical polymerizations, the composition is added to a free-radically polymerizing system.

公开(公告)号：US09957202B2

公开(公告)日：2018-05-01

申请号：US14261932

申请日：2014-04-25

Applicant: BASF SE

Inventor： Friedrich-Georg Martin ,  Oliver Odenwald

IPC: C07B63/04 ,  B01J19/00 ,  B01J4/00

CPC classification number: C07B63/04 ,  B01J4/001 ,  B01J19/002 ,  B01J2219/00272

Abstract: The present invention relates to a process for restabilizing free-radically polymerizable monomers. The process comprises the steps: (a) introduction of a solution of an inhibitor of the free-radical polymerization by means of an inert pressurized gas into a vessel (1) comprising the monomers via a line (10) which comprises an ascending region, and (b) mixing of the contents of the vessel and the inhibitor solution by blowing gas through the line (10). In step (a), the flow velocity of the pressurized gas is set so that plug flow or annular flow is obtained as flow regime of the inhibitor solution and in step (b) the superficial gas velocity is set to ≥0.1 mm/s. The present invention further relates to a supply unit (11) for carrying out the process.