Method for preparing polyacryl(meth)acrylates

US6271324A · kind A · utility

Assignee

• BASF SE

Inventors

• Stephan Jungling · Mannheim, DE
• Christof Mehler · Dossenheim, DE
• Horst Weiss · Karlsruhe, DE
• Susanne Steiger · Wasserburg am Inn, DE
• Axel Muller · Wiesbaden, DE
• Helmut Schlaad · Bad Kreuznach, DE
• Bardo Schmitt · Mainz, DE

Key dates

• Filing date: May 12, 1999
• Grant date: Aug 7, 2001
• Expiry date: May 12, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F297/026
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Homopolymers, copolymers or block copolymers are prepared by anionic polymerization of acrylates and/or methacrylates in the presence of an initiator composition containing PA1 A) an organic alkali metal compound, PA1 B) an organic aluminum compound and PA1 C) an additive which forms a complex with the alkali metal cation and is selected from the group consisting of open-chain ethers having at least two ether oxygen atoms, macrocyclic ethers and cryptands, or from the group consisting of quaternary cations of the general formula I ##STR1## PA1 where PA2 A is N, P, As or Sb and PA2 R.sup.a, R.sup.b, R.sup.c and R.sup.d, PA2 independently of one another, are each unsubstituted or substituted alkyl, cycloalkyl, aralkyl or aryl, where two neighboring radicals, together with the heteroatom A, may form a 5- or 6-membered heterocyclic structure which may contain one or two further heteroatoms selected from nitrogen, oxygen and sulfur atoms.