| 摘要 |
PURPOSE:To produce the subject modified silk fine powder remarkably excellent in dispersibility in a liquid and dispersion stability with time and suitable for an emulsion cosmetics, a coating material, etc., by modifying the crystallinity to <=1/2 of that of natural silk fiber and controlling its volume-average particle size to <=5mum. CONSTITUTION:A crude powder obtained by treating a regenerated sild crude powder from an aqueous silk fibroin solution or a silk fiber with an acid or an alkali and modifying the crystallinity of the resultant brittle crude powder, etc., to <=1/2 of that of natural silk fiber is subjected to wet grinding by a ball mill using water or an organic solvent as the dispersion medium to obtain a modified silk fine powder having <=5mum, preferably <=2mum volume-average particle size and an aqueous or organic solvent dispersion of the above- mentioned powder. |
