A barrier film is provided for a product used in contact with body fluids. The barrier film comprises an alkali salt of a sulfated cellulose ester, with a degree of sulfate substitution satisfactory to render the film resistant to body fluids and yet dispersible in low salt concentration aqueous solutions such as those found in a household water closet. There is also disclosed a process for preparing alkali salts of sulfated cellulose esters comprising sulfating woodpulp, acylating the sulfated wood pulp, and precipitating the desired product in an aqueous precipitation medium maintained at a specified pH range.
提供了一种用于与体液接触的产品的屏障膜。该屏障膜包括
硫酸化
纤维素酯的碱盐,具有足够的
硫酸取代度,以使膜对体液具有抵抗力,但在低盐浓度
水溶液中(例如家庭
水箱中发现的那些
水)可以分散。还公开了一种制备
硫酸化
纤维素酯的碱盐的方法,包括对木浆进行
硫酸化,酰化
硫酸化木浆,并在维持指定pH范围的
水沉淀介质中沉淀所需的产品。