Title:
PRODUCTION OF LIGHT-COLORED POLYMER MATERIAL BY REMOVING COLORING AGENT FROM COLORED POLYMER MATERIAL
Document Type and Number:
Japanese Patent JP3179230
Kind Code:
B2
Abstract:
PURPOSE: To obtain a polymer material such as PET having a color lightened to an extent to enable the reuse from a polymer material colored with an organic pigment, etc., in high efficiency at a low cost by dissolving the colorant with a solvent and separating from the polymer material.
CONSTITUTION: A test piece of waste polyethylene terephthalate(PET) colored to green color and used as a bottle for refreshing drink is charged into a Soxhlet extractor and refluxed (at 180°C) in an organic chlorine compound solvent (e.g. o-dichlorobenzene) under normal pressure for 3hr to extract the green pigment from the PET. The obtained PET exhibits pale yellow color and the test piece (0.3mm thick) produced therefrom has an extinction coefficient of 0.7 (420nm wavelength) and 0.1 (670nm wavelength). A polymer material having a color lightened to an extent to enable the practical use can be regenerated from a colored polymer material in high efficiency at a low cost.
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Inventors:
Hiroyasu Ohno
Hiroyuki Noriyuki
Kenji Shimamoto
Kawauchi Masatoshi
Hiroyuki Noriyuki
Kenji Shimamoto
Kawauchi Masatoshi
Application Number:
JP4567893A
Publication Date:
June 25, 2001
Filing Date:
February 10, 1993
Export Citation:
Assignee:
Mitsui Chemicals, Inc.
International Classes:
B29B17/00; C08J3/00; C08J11/00; C08J11/02; B29K67/00; B29K105/26; (IPC1-7): C08J3/00
Domestic Patent References:
| JP4215804A | ||||
| JP2305823A |
Attorney, Agent or Firm:
Haruo Ideta