The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 03, 2004
Filed:
Jul. 21, 2003
Shoichi Murata, Takasago, JP;
Nobuyuki Nishi, Takasago, JP;
Kenichiro Cho, Kakogawa, JP;
Masaaki Yokoe, Kakogawa, JP;
Akio Konishi, Kakogawa, JP;
Kaneka Corporation, Osaka, JP;
Abstract
The present invention provides synthetic hair comprising fiber of 30 to 100 decitex, comprising an acrylic copolymer obtained by copolymerizing acrylonitrile, vinylidene chloride and a vinyl monomer containing a sulfonic acid group and a process for preparing the synthetic hair. The synthetic hair of the present invention has favorable surface gloss and excellent knot strength and hair breaking in the sewing machine steps when preparing the weft and in implanting hair to skin when preparing wigs and toupees is improved. The fiber which becomes the synthetic fiber is prepared by preparing a spinning solution containing, in a polymer solution of an acrylic polymer comprising 40 to 74% by weight of acrylonitrile, 25 to 59% by weight of vinylidene chloride and 1 to 5% by weight of a vinyl monomer containing a sulfonic acid group copolymerizable therewith and a good solvent, 5 to 20 parts by weight of water based on 100 parts by weight of the polymer, forming fiber by wet spinning, conducting drawing treatment so that the total drawing ratio becomes 2.5 to 12 times and conducting relaxing treatment so that the total relaxation ratio becomes at least 15%. By this method, synthetic hair is obtained, in which the gloss contrast is at least 0.88, the knot strength is at least 0.5 cN/decitex and the average fineness of the filament is 30 to 100 decitex.