AZOBISAMIDINOPROPANE DIHYDROCHLORIDE

Oligomeric agents were prepared by condensing trimethylolpropane with ethylene and/or propylene oxides and capping with acrylic acid. These materials were subsequently crosslinked using 2,2 -azobisamidinopropane dihydrochloride, which formed superabsorbent swellable hydrogel addition polymers and were useful as components in diapers or in feminine hygiene products. 

TABLE 1. Properties of hydrogels prepared by free radically polymerizing the corresponding triacrylate with 2,2 -azobisamidinopropane dihydrochloride. 

A reactor containing acrylic acid (305 g), 37.3wt % aqueous sodium acrylate (3204 g), and water (1465g) was treated with ethoxylated (15 EO) trimethylolpropane triacrylate (12.2g), 2,2 -azobisamidinopropane dihydrochloride (0.61 g), and sodium persulfate (3.05 g). The mixture was purged for 30 minutes and further treated with hydrogen peroxide (0.244 g) dissolved in water (5g) and ascorbic acid (0.244 g) also dissolved in water (5g). The mixture was then heated in a thermally insulated mb for about 30 minutes the temperature at the start of the reaction was 113 C. The reaction started after a few minutes and proceeded under adiabatic conditions until the product was isolated and comminuted through a meat grinder equipped with a 6 mm breaker plate. The residue was dried at 80°C under reduced pressure and the produce, was isolated having a sieve fraction of 300 to 600 pm. 

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See also in sourсe #XX -- [ ]

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