At first,4.4-dihydroxy diphenyl sulfone is prepared,and then it reacts with naphthalene sulfonic acid,formaldehyde and urea in an acid agu- eous medium. It will be obtained homogeneous,water-soluble co-condensation products.

• 首先由苯酚合成4.；4′-二羟基二苯砜；再与萘磺酸；甲醛和脲在酸性水溶液中反应；得到均相水溶性的共缩合物。