BASF Patents Aqueous Coating

August 7, 2014

U.S. 8,629,207 B2
BASF has obtained a patent for a n aqueous coating formulation comprised of a substituted, branched polyethyleneimine, which is obtained by a process comprised of reacting a branched polyethyleneimine having a weight-average molecular weight of from 500 to 10,000 g/mol with a carboxylic acid derivative of formula (I) R—(C=O)X  (I), wherein R is a C5 to C18 alkyl group or a C5 to C18 alkenyl group, X is a halogen, a hydroxyl group, or a group R—(C=O)—O—, a molar amount of the carboxylic acid derivative in the reacting is from 3 to 10 mol percent of a molar amount of ethyleneimine employed in preparing the branched polyethyleneimine, the reacting is comprised of formation and removal of a byproduct HX, and the formulation is configured to coat a substrate that is comprised of tannin.