| abstract |
PURPOSE: An acrilic acid solution containing alkali or ammonium and water is polymerized with no use of crosslinking agent, thus producing title substance reversibly absorbs and expells water in high level and used as water-retention agent, coagulant or for cultivation of plants. n CONSTITUTION: The polymerization of a solution of acrylic acid containing an alkali and/or ammonium and water, resulting in 3W9 pH, is effected with no use of crosslinking agent at 106W160°C to produce said swelling substance. n COPYRIGHT: (C)1980,JPO&Japio |