Patent ID: 8728625

Claim:
A water-reducible coating composition, comprising: a water-reducible polymer binder; water; and a ketal adduct of formula (1) wherein R 1 is C1-6 alkyl, C2-6 alkenyl, C3-6 cycloalkyl, C5-6 cycloalkenyl, C6-12 aryl, C7-C13 arylalkylene, or —(CH 2 ) s OR 8 wherein s is 1-3 and R 8 is C1-6 alkyl or (OCH 2 CH 2 ) t OCH 2 CH 3 wherein t is 1-10, R 2 is hydrogen or C1-14 alkyl, R 3 is hydrogen or C1-6 alkyl, each R 4 and R 5 is independently hydrogen, C1-6 alkyl, C1-6 alkyl substituted with up to four OR 9 groups wherein R 9 is hydrogen, C1-6 alkyl, or C(O)R 10 wherein R 10 is C1-6 alkyl, or R 4 and R 5 taken together are a double-bonded oxygen, or when b is 1, R 3 and R 4 together with their directly attached carbons form a fused cycloaliphatic ring having a total of 5-6 carbon atoms or 4-5 carbon atoms and 1-2 oxygen atoms, R 6 is hydrogen, C1-6 alkyl, or hydroxymethylene, or when b is 0, R 3 and R 6 together with their directly attached carbons form a fused cycloaliphatic or aromatic ring having a total of 5-6 carbon atoms or 4-5 carbon atoms and 1-2 oxygen atoms, R 7 is hydrogen, C1-6 alkyl, C1-6 alkyl substituted with up to four OR 8 groups wherein R 8 is hydrogen, C1-6 alkyl, or C(O)R 10 wherein R 10 is C1-6 alkyl, or C5-6 cylcoalkyl that is optionally substituted with an oxygen in the ring and further optionally substituted with 1-2 hydroxyl or OR 11 wherein R 11 is C1-3 alkyl, a is 0-6, and b is 0-1, wherein the composition comprises about 0.1 to about 30 wt. % of the ketal adduct, based on the weight of the water-reducible polymer binder.