Title:
PHOTOCHEMICAL MARKING OF SUBSTRATES
Document Type and Number:
WIPO Patent Application WO/1989/005994
Kind Code:
A1
Abstract:
A method is provided for forming on a substrate an image-forming region which may be converted to a coloured from on exposure to U.V. light. The method comprises applying to the substrate a solution or dispersion comprising a 1,2-dihydro-2,2-dialkyl quinolinium salt (DHQ salt) of formula (I), wherein R1 and R2, which may be same or different represent lower alkyl groups, R3 representes hydrogen, lower alkyl or halogen, R4 - R7, which may be the same or different represent hydrogen, lower alkyl, lower alkoxy or halogen, R8 represents hydrogen or lower alkyl, and A- represents an anion, and a liquid solvent or dispersant and allowing the solution or dispersion to dry so as to deposit the DHQ salt on the substrate as a crystallite.
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Inventors:
HELLER HARRY GEORGE (GB)
WHITTALL JOHN (GB)
WHITTALL JOHN (GB)
Application Number:
PCT/GB1988/001115
Publication Date:
June 29, 1989
Filing Date:
December 22, 1988
Export Citation:
Assignee:
TRAQSON LTD (GB)
International Classes:
G03C5/16; C07D215/06; C07D215/20; G03C1/73
Foreign References:
| GB1170265A | 1969-11-12 | |||
| US3582342A | 1971-06-01 | |||
| US3325288A | 1967-06-13 | |||
| FR2244514A1 | 1975-04-18 | |||
| FR2115980A5 | 1972-07-07 |
Other References:
Journal of the American Chemical Society, volume 19, no. 23, 5 November 1969, (Washington, D.C., US), J. Kolc et al.: "Photochromism of 1,2-dihydroquinolines", pages 6513-6514
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