Cosmetic material containing crystalline superfine silk powder
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United States of America Patent
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Apr 13, 2004
Grant Date -
N/A
app pub date -
Feb 2, 2001
filing date -
Jul 12, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention provides a cosmetic material containing a crystalline superfine silk powder that has the original structure of silk yarn, properties such as an unique gloss, feeling of touch, flexibility, and elasticity; and various properties such as excellent coating power, spreadability, adhesion, feeling of touch, and formability, which are required of an extender powder or color material of cosmetics. The cosmetic material contains a colored crystalline superfine silk powder obtained by the steps of bringing a silk substance into contact with an alkali aqueous solution at temperatures ranging from 100.degree. C. to 150.degree. C. under a pressure ranging from 1 through 5 atmospheric pressures to weaken the silk substance to not greater than 0.02 g/d in tensile strength, dealkalizing and drying the silk substancepowdering the silk substance into a crystalline superfine silk powder below 3 .mu.m in average particle diameter, and dyeing the crystalline superfine silk powder with a natural or synthetic color material, or mixing the crystalline superfine silk powder with a natural or synthetic color material.
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