| 摘要 |
PROBLEM TO BE SOLVED: To simply and inexpensively obtain the subject new crosslinked material usable as a thicknening agent, a water-absorbing resin, etc., high in biodegradability, by irradiating a solution of a polyaspartic acid with radiation. SOLUTION: A polyaspartic acid is dissolved in a solvent and the prepared solution is irradiated with radiation to give the objective crosslinked material having an absorption ability of 200 times as much as the weight of the crosslinked material by a tea bag method. For example, the neutralization degree of the polyaspartic acid is 50-100%, and a mixture of water as a main component with a water-soluble liquid such as methyl alcohol is used as the solvent. The radiation isγ-rays and theγ-ray absorbed dose is preferably 10-500kGy.
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