CPC B01J 20/267 (2013.01) [A61L 15/26 (2013.01); B01J 20/28004 (2013.01); B01J 20/28016 (2013.01); C08G 63/12 (2013.01); A61L 15/60 (2013.01)] | 12 Claims |
1. A method for making crosslinked γ-polyglutamic acid absorbent configured for use as part of a diaper, the method comprising:
providing γ-polyglutamic acid before crosslinking having an Mn of about 0.6-0.7 million Da when assessed using HPLC using size exclusion chromatography (SEC) using UV and/or refractive index (IR) detectors;
crosslinking γ-polyglutamic acid with sorbitol polyglycidyl ether to provide crosslinked γ-polyglutamic acid absorbent, wherein the amount of sorbitol polyglycidyl ether during crosslinking is about 1-3% of the total weight of γ-polyglutamic acid and sorbitol polyglycidyl ether;
wherein the resulting crosslinked γ-polyglutamic acid absorbent has an absorption under load (AUL) of about 10 to 50 g/g under 0.7 psi when assessed according to ISO 17190-7, and a centrifugal retention capacity (CRC) of about 20 to 50 g/g when assessed according to ISO 17190-6.
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