Reduction in the pH of anionic polyurethane dispersions which are stabilized by carboxylate or sulfonate groups
AssigneeBASF SE
InventorsErich Gulbins, Karl Haeberle, Ulrike Licht, Alexander Wallon
Life of this patent
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Abstract
A process for reducing the pH of anionic polyurethane dispersions which are stabilized by carboxylate or sulfonate groups, which comprises adding a compound which has from one to four ester groups but no acid group or acid halide or anhydride group to the dispersions.
Claims3
A process for reducing the pH of anionic polyurethane dispersions which are stabilized by carboxylate or sulfonate groups to a pH of .gtoreq.6, which comprises adding a compound which has from 1 to 4 ester groups, but no acid group or acid halide or anhydride group to the dispersions,
- wherein said compound is an ester produced from the reaction of an inorganic acid or an organic acid selected from the group consisting of acids having the formula
- (R).sub.x C.sub.n H.sub.(2n+2-x)
- wherein n is an integer from 1 to 8, x is an integer from 1 to 4, and R is --COOH, --SO.sub.3 H, --P(OH).sub.2 or --PO(OH).sub.2 ;
- with a monoalcohol having 1 to 6 carbon atoms.
A process for reducing the pH of anionic polyurethane dispersions which are stabilized by carboxylate or sulfonate groups to a pH of .gtoreq.6, which comprises adding a compound which has from 1 to 4 ester groups but no acid group or acid halide or anhydride group to the dispersions,
- wherein said compound is a member selected from the group consisting of esters produced from the reaction of formic, acetic, oxalic, malonic, adipic or toluenesulfonic acids with methanol or ethanol.
Dependencies are inferred from the claim text.