PROCESS FOR PRODUCING ULTRAFINE CRYSTALLINE SILK - JP NAT INST OF SERICULTURAL AN

Title:

PROCESS FOR PRODUCING ULTRAFINE CRYSTALLINE SILK

Document Type and Number:

WIPO Patent Application WO/2000/075219

Kind Code:

A1

Abstract:

A process for industrially producing, through the physical pulverization of silk fibers, a crystalline silk fibroin powder having an average particle diameter smaller than 3 $g(m)m which is usable in various applications. A silk material such as cocoon fiber, silk, or raw silk is contacted with an aqueous alkali solution at a temperature of 100 to 150 °C and a pressure of 1 to 5 atm to reduce the tensile strength of the silk material to about 0.02 g/d or lower, subsequently subjecting the silk material to alkali removal and drying, and then pulverizing the dried silk material to an average particle diameter smaller than 3 $g(m)m. Thus, a crystalline silk fibroin powder having an average particle diameter smaller than 3 $g(m)m is produced.

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Inventors:

TSUBOUCHI KOZO (JP)

Application Number:

PCT/JP1999/007197

Publication Date:

December 14, 2000

Filing Date:

December 21, 1999

Export Citation:

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Assignee:

JP NAT INST OF SERICULTURAL AN (JP)
TSUBOUCHI KOZO (JP)

International Classes:

B29B9/12; B29B13/10; C08H1/00; C08J3/12; C08L89/00; (IPC1-7): C08J3/12; C08H1/00; B02C21/00

Foreign References:

US5853764A	1998-12-29
JPH04337331A	1992-11-25
JPH11100510A	1999-04-13
JPH0335024A	1991-02-15
JPS5846097A	1983-03-17
JPS5845232A	1983-03-16

Other References: