Patent ID: 8246990

Claim:
A hydrogel composition comprising: (a) 0.3-50.0 wt. %, based on the total weight of the hydrogel composition, of a water gellant comprising a hydrophilic polymer to which at least two 4H-units are covalently attached, wherein the 4H-unit has the general formula (3) or formula (4) and tautomers thereof: wherein X is nitrogen atom or a carbon atom bearing a substituent R 15 , and wherein the 4H-unit is bonded to a polymer backbone via R 1 and R 2 or via R 1 and R 3 with the other R groups representing, independently a side chain according to (i)-(viii); (i) hydrogen; (ii) C 1 -C 20 alkyl; (iii) C 6 -C 12 aryl; (iv) C 7 -C 12 alkaryl; (v) C 7 -C 12 alkyl aryl; (vi) polyester groups having the formula (5) wherein R 4 and Y are independently selected from the group consisting of hydrogen and C 1 -C 6 linear or branched alkyl, n is 1-6 and m is 10 to 100; (vii) C 1 -C 10 alkyl groups substituted with 1-4 ureido groups according to the formula (6): R 5 —NH—C(O)—NH— (6) wherein R 5 is selected from the group consisting of hydrogen and C 1 -C 6 linear or branched alkyl; (viii) polyether groups having the formula (7) wherein R 6 , R 7 and Y are independently selected from the group consisting of hydrogen and C 1 -C 6 linear or branched alkyl and o is 10-100; (b) 50.0 to 99.7 wt. % water, based on the total weight of hydrogel; (c) a polar solvent other than water, wherein the polar solvent comprises less than 15 wt. % of the total weight of the hydrogel composition; and wherein components (a)-(c) form a hydrogel.