Optical fingerprinting of plastics compositions

Details Optical fingerprinting of plastics compositions Optical fingerprinting of plastics compositions

1998-07-20

2000-07-18

Font, Frank G.

Optics: measuring and testing

By dispersed light spectroscopy

With raman type light scattering

356300, 356402, 356337, G01J 344

Patent

active

060914912

ABSTRACT:
A plastics material which contains a pigment composition comprising a pigment having adsorbed on its surface, or as a physical mixture, up to 10% by weight, based on the total weight of pigment composition of a coding compound which is a compound containing azo, azomethine or polycyclic chromophore and which has an absorption spectrum and a Raman spectrum different from that of the pigment.

REFERENCES:
patent: 4231918 (1980-11-01), Babler
patent: 4233206 (1980-11-01), Katsura et al.
patent: 4826898 (1989-05-01), Hirosawa et al.
patent: 5665429 (1997-09-01), Elwakil
patent: 5718754 (1998-02-01), Macpherson et al.
patent: 5866241 (1999-02-01), Xiang

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