Method for manufacturing crystalline superfine silk powder
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United States of America Patent
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Aug 6, 2002
Grant Date -
N/A
app pub date -
Mar 28, 2000
filing date -
Jun 3, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The main theme of the invention is to provide a method for manufacturing industrially, by mechanically comminuting silk yarn, crystalline silk fibroin powder below 3 .mu.m in an average particle diameter, which can be used for various applications. A silk substance such as cocoon filament, silk yarn, or raw silk is brought into an alkali aqueous solution under a pressure of 1 through 5 atmospheric pressure at temperatures from 100.degree. C. through 150.degree. C. to reduce the tensile strength of the silk substance to around 0.02 g/d or less. Thereafter, the resultant silk substance is subjected to dealkalization and drying. Subsequently, the resultant dried silk substance is comminuted into powder below 3 .mu.m in an average particle diameter. Thus, the crystalline silk fibroin powder below 3 .mu.m in an average particle diameter is manufactured.
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