Absorbent gelling materials of cross-linked polyaspartate

Abstract From the Canadian patent

Absorbent gelling materials are prepared by cross-linking polyaspartate units. The cross-linked homopolymers exhibit improved gel volumes gel strengths and , extractable material characteristics. Using diamine cross-linkers in an amount of 2.5 - 30 percent by weight, the blue-dextran saline gel volumes of at least 15 can be obtained. Similarly, gel strengths of 300 N/m2 or better including , gel strengths above 3000 N/m2 can be obtained. The resulting product is susceptible of a variety of uses, is biodegradable and can be prepared in a , particle size suitable for use in a diaper.