申请人:MITSUI CHEMICALS, INC.
公开号:EP0866084A2
公开(公告)日:1998-09-23
A process is disclosed for producing with good productivity a cross-linked polyaspartic acid resin having biodegradability and high water absorbency. The process features inclusion of one of the following steps: (a) a polysuccinimide, which has been brought into a dispersed state by a dispersant, and a cross-linking agent are reacted to produce the cross-linked polyaspartic acid resin; (b) imide rings of a cross-linked polysuccinimide are subjected to a hydrolysis reaction while controlling a swelling degree of a resulting gel, whereby the cross-linked polyaspartic acid resin is produced; and (c) a gel of a cross-linked polysuccinimide, which has been obtained by reacting a cross-linking agent to a solution of a polysuccinimide in an organic solvent, is disintegrated to subject imide rings of the cross-linked polysuccinimide to a hydrolysis reaction, so that the cross-linked polyaspartic acid resin is produced. The process may also include one or both of the following steps as needed: (d) a gel of the cross-linked polyaspartic acid resin is washed with water and/or a water-miscible organic solvent; and (e) the polysuccinimide is produced using a basic amino acid as a cross-linking agent.
本发明公开了一种工艺,用于生产具有生物降解性和高吸水性的交联聚天冬氨酸树脂,生产效率高。该工艺的特点是包含以下步骤之一:(a) 通过分散剂使聚琥珀酰亚胺进入分散状态,并与交联剂反应,生成交联聚天冬氨酸树脂;(b) 将交联聚琥珀酰亚胺的酰亚胺环进行水解反应,同时控制所得凝胶的溶胀度,从而生成交联聚天冬氨酸树脂;(c) 将交联剂与聚琥珀酰亚胺在有机溶剂中的溶液反应而得到的交联聚琥珀酰亚胺凝胶分解,使交联聚琥珀酰亚胺的酰亚胺环发生水解反应,从而制得交联聚天冬氨酸树脂。根据需要,该工艺还可包括以下一个或两个步骤:(d) 用水和/或水混溶有机溶剂洗涤交联聚天冬氨酸树脂的凝胶;(e) 使用碱性氨基酸作为交联剂生产聚琥珀酰亚胺。