Azobisisobutyronitrile → Butadiene maleic acid

Participants

Reaction Steps

A polymerization was carried out at 70° C. for 4 hours using 54.1 g. of butadiene, 98.1 g. of maleic anhydride and 1.7 g. of azobisisobutyronitrile in 750 cc. of acetone. There was obtained 106.0 g. of a pale yellow copolymer with an intrinsic viscosity of 0.50 as measured in cyclohexanone at 30° C. (All measurements are done hereinbelow under the same conditions.) A reaction was carried out at 80° C. for 1 hour using 15.2 g. of the copolymer, 6.0 g. of sodium hydroxide and 131 g. of water to form an aqueous solution of butadiene-maleic acid copolymer sodium salt. The aqueous solution, an aqueous calcium-chloride solution at a concentration of 0.1 M/l, 30% aqueous solution of sodium lauryl sulfate (LAS) and water were employed together with THPA in an amount equal to the copolymer salt to prepare compositions shown in Table 1. Whereas aqueous gel was formed with the compositions of Examples 1-5, no aqueous gel was formed or the polymer was precipitated with the compositions of Comparative Examples 1-3, in which one of the essential components was not contained.

Provenance & Evidence