Abstract: The present invention relates to a hydroxy-functional copolymer P, which is present as a dispersion and/or solution in water, and is obtained by successively carrying out process steps A-D:
A) initially introducing a hydrophobic polymer containing hydroxyl groups into a reaction vessel,
B) introducing an initiator component into that vessel,
C) subsequently polymerizing a hydrophobic monomer mixture containing hydroxyl groups in that vessel and
D) subsequently polymerizing a hydrophilic monomer mixture containing hydroxyl and acid groups in that vessel. The present invention also relates to a process for the preparation of copolymers P following the procedure previously set forth and to coating compositions containing these copolymers P and one or more crosslinking agents.
Type:
Grant
Filed:
March 25, 2002
Date of Patent:
March 11, 2003
Assignee:
Bayer Aktigensellschaft
Inventors:
Martin Melchiors, Rolf Bachmann, Wieland Hovestadt, Karl-Ludwig Noble, Harald Blum