反应详情

of the same butadiene-maleic anhydride copolymer as in Example 11, 40g. of cyclohexylamine and 500 ml. of water were fed in a separable 1 liter flask equipped with a stirrer and a reflux condenser. A reaction was carried out for 1 hour at 100° C. under a nitrogen gas atmosphere to give a transparent, viscous, aqueous butadiene-maleic acid copolymer cyclohexylamine salt solution. To this aqueous solution was added over a period of 10 minutes a separately prepared aqueous solution of 56g. of magnesium acetate tetrahydrate in 100 ml. of water. After completion of the addition, heating was applied up to near 100° C. while a violent stirring was applied to the interior pf the flask, resulting in that there were deposited many solids in the form of small lumps. The solids were separated from the liquid phase by means of hot filtration and collected in a flask. Cooling of the flask in an ice-water bath resulted in that after 5 minutes the solids therein were completely converted into an aqueous solution. To the aqueous solution thus obtained there were repeatedly applied such heating and cooling operations. At every repetition the aqueous solution on heating was converted into a rubber-like matter and on cooling reverted to its original liquid phase.

1. customequipped with a stirrer and a reflux condenser