Method for the preparation of ultrafine fibrous assembly having twisted morphology

US5705635A · kind A · utility

Assignee

• Japan as represented by Director General of the Agency of Industrial Science and Technology · JP

Inventors

• Toshimi Shimizu · Yokohama, JP
• Mitsutoshi Masuda · Ibaraki, JP

Key dates

• Filing date: Nov 14, 1996
• Grant date: Jan 6, 1998
• Expiry date: Nov 14, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07H1/00
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

When a saturated aqueous solution of a bolaform glycolipid represented by the general formula EQU G--NH--CO--(CH.sub.2).sub.n --CO--NH--G, in which G is a residue derived from a D- or L-glucopyranose by excepting the reduced-terminal hydroxyl group and the subscript n is 10, 12 or 14, at a high temperature, e.g., 90 .degree. C. or higher, is cooled at a controlled rate of 0.5 .degree. C./minute or lower, crystallite growth of the precipitates proceeds to form an ultrafine fibrous assembly of up to several hundreds .mu.m length having a twisted fibrous morphology of right- or left-hand screw. The twisted fibrous assembly thus obtained has usefulness as a functional material in the field of fine chemicals and in the fields of electronic and information technologies.