US 11,866,563 B2
Carboxy-functional, polyether-based reaction products and aqueous basecoat materials comprising the reaction products
Bernhard Steinmetz, Ruetschenhausen (DE); Peter Hoffmann, Senden (DE); and Hardy Reuter, Muenster (DE)
Assigned to BASF COATINGS GMBH, Muenster (DE)
Filed by BASF Coatings GmbH, Muenster (DE)
Filed on Oct. 19, 2020, as Appl. No. 17/073,569.
Application 17/073,569 is a continuation of application No. 16/060,482, granted, now 10,889,090, previously published as PCT/EP2016/079192, filed on Nov. 30, 2016.
Claims priority of application No. 15198679 (EP), filed on Dec. 9, 2015.
Prior Publication US 2021/0031496 A1, Feb. 4, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. B32B 27/00 (2006.01); C09D 151/08 (2006.01); C08G 63/668 (2006.01); C08J 7/043 (2020.01); C08J 7/046 (2020.01)
CPC C08J 7/043 (2020.01) [B32B 27/00 (2013.01); C08G 63/668 (2013.01); C08J 7/046 (2020.01); C09D 151/08 (2013.01)] 12 Claims
 
1. A pigmented aqueous basecoat material, comprising
a polyether-based reaction product prepared by reacting
(a) at least one cyclic carboxylic anhydride comprising a free carboxylic acid group and/or a halide of a carboxylic acid group
with
(b) at least one polyether of formula (I)

OG Complex Work Unit Chemistry
wherein
R is a C3 to C6 alkylene radical and n is selected accordingly such that the polyether (b) possesses a number-average molecular weight of from 1000 to 4000 g/mol,
a molar ratio of (a) to (b) ranges from 0.7/2.3 to 1.6/1.7,
the polyether-based reaction product has an acid number of 5 to 50 mg KOH/g, and
a sum total of weight-percentage fractions, based on a total weight of the basecoat material, of all polyether-based reaction products is 0.1 to 5.0 wt %.