Title:
IMPROVED METHOD FOR IDENTIFYING PLASTICS
Document Type and Number:
Japanese Patent JP3203355
Kind Code:
B2
Abstract:
PURPOSE: To clearly distinguish and make separable different plastics by combining a plurality of fluorescent dyes which differ in terms of their emission frequencies and in term of the duration of their fluorescence and using them as a marker for the plastics.
CONSTITUTION: Each plastic is imported with a plurality of fluorescent dyes which differ in terms of their emission frequencies and/or in terms of the duration of their fluorescence, so that a fluorescence pattern, which is distinguished by the duration of their fluorescence and/or by the frequencies occurring be assigned to each plastic to identify different plastics. Specifically, for example, the terbium complex salt showing a strong green fluorescence after UV exciting and also showing the duration of life of several hundreds microseconds, the eurobium complex salt showing a strong red fluorescence under the UV exciting and also showing the duration of life of several hundreds microseconds, coumalin 1 showing a red fluorescence and the duration of life of nanosecond and coumalin 2 showing a green fluorescence and the duration of life of nanosecond are combined to use, so that 15 of different plastics can be labeled according to the difference of their fluorescence patterns.
Inventors:
Arno Betzker
Klaus Luthermann
Ube Clausen
Peter Ort
Rutger Heiliger
Atsu El Zieto
Klaus Luthermann
Ube Clausen
Peter Ort
Rutger Heiliger
Atsu El Zieto
Application Number:
JP11663893A
Publication Date:
August 27, 2001
Filing Date:
April 21, 1993
Export Citation:
Assignee:
Klaus Luthermann
International Classes:
C08K5/00; B07C5/342; C08F2/44; C08J3/20; C08L101/00; G01N21/64; (IPC1-7): B07C5/342; C08K5/00; C08L101/00
Domestic Patent References:
| JP63191884A |
Attorney, Agent or Firm:
Heikichi Odashima