[CH2:1]=[CH:2][CH:3]=[CH2:4].[C:5]1(=[O:11])[O:10][C:8](=[O:9])[CH:7]=[CH:6]1.N(C(C)(C)C#N)=NC(C)(C)C#N.C(S)CCCCCCCCCCC.[S].[OH-:38].[Na+]>O.CC(C)=O>[CH2:1]=[CH:2][CH:3]=[CH2:4].[C:5]([OH:10])(=[O:11])/[CH:6]=[CH:7]\[C:8]([OH:38])=[O:9]A polymerization was carried out at 70° C. for 6 hrs. using 54.1 g. of butadiene, 98.1 g. of maleic anhydride, 1.7 g. of azobisisobutyronitrile and 36.0 g. of n-dodecylmercaptan in 750 cc. of acetone. There was obtained 61.0 g. of a white copolymer with an intrinsic viscosity of 0.08. Proportion of the end dodecylthio group in the copolymer was found by the elementary analysis for sulfur to be 5.4%. A reaction was carried out at 80° C. for 1 hr. using 16.1 g. of the copolymer, 6.0 g. of sodium hydroxide and 139 g. of water to give an aqueous solution of a butadiene-maleic acid copolymer sodium salt containing end dodecylthio groups. A composition identical in composition with the composition of Example 2 was prepared using the above-prepared aqueous solution, an aqueous calcium chloride solution at a concentration of 0.1 M/l, an aqueous solution of sodium lauryl sulfate at a concentration of 30% and water to which THPA was added in the same amount as that of the copolymer salt. Aqueous gel obtained from the composition was slower in rate of the gelation and lower in strength of the gel as compared with the aqueous gel of Example 2.
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