Method for producing polysuccinimide, polysuccinimide composition, and polyaspartic acid composition

Abstract

Provided is a method for producing a polysuccinimide that can simply produce a high molecular weight polysuccinimide. The method for producing a polysuccinimide is a method for producing a polysuccinimide in which a second polysuccinimide is produced using a polysuccinimide composition containing a first polysuccinimide. The method includes: performing a chain elongation reaction of the first polysuccinimide to obtain the second polysuccinimide. The first polysuccinimide has a weight average molecular weight (Mw) falling within a range of 25,000 to 50,000. The polysuccinimide composition contains dicarboxylic acid at a ratio of 1.5 mol % to 4 mol %.

Dependencies are inferred from the claim text.