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AssigneeSR Corporation
InventorsKyoko Kuroda, Masayuki Hattori, Yoshitaka Yamakawa, Kenya Makino, Toshio Hayashi
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A process for preparing poly-.alpha.-amino acid particles comprising polymerizing an .alpha.-amino acid-N-carboxy anhydride using a polymerization initiator in an organic solvent in which both the solubility of the .alpha.-amino acid-N-carboxy anhydride and the solubility of the produced poly-.alpha.-amino acid are 0.1 g/100 ml or less at 25.degree. C. Polyamino acid particles having a high molecular weight and a small bulk specific gravity can be manufactured very easily without requiring specific procedures. The polyamino acid particles can be used as a coating material for papers, resins, rubbers, and fibers; particles for cosmetics; particles for diagnostic drugs; fillers for chromatography; and an encapsulating material for drugs, fertilizers, and perfumes.
A process for preparing poly-.alpha.-amino acid particles comprising polymerizing an .alpha.-amino acid-N-carboxy anhydride using a polymerization initiator in an organic solvent having a water content of 2 wt % or less in which both the solubility of the .alpha.-amino acid-N-carboxy anhydride and the solubility of the produced poly-.alpha.-amino acid are at most 0.1 g/100 ml at 25.degree. C. said organic solvent being present in an amount of 1 to 50 wt % based on said .alpha.-amino acid-N-carboxy anhydride.
Dependencies are inferred from the claim text.