Squarylium dyes and products and processes using same

Details Squarylium dyes and products and processes using same Squarylium dyes and products and processes using same

1991-06-17

1993-05-18

Stoll, Robert L.

Compositions

Light transmission modifying compositions

Infrared

544 73, F21V 904, C07D26502

Patent

active

052118851

ABSTRACT:
A novel class of squarylium infrared absorbing dyes is disclosed which are prepared by the condensation of squaric acid with a benzoxazinone. The dyes are unique in that they possess the desirable properties of squarylium dyes in general along with a narrow band of peak absorbency greater than 1000.
Because of their stability to laser beams, the dyes are particularly useful in ocular products for eye protection against lasers.

REFERENCES:
patent: 5013474 (1991-05-01), Arai et al.
patent: 5024911 (1991-06-01), Akasaki et al.
patent: 5030009 (1991-07-01), Ando et al.
patent: 5104758 (1992-04-01), Mashimo et al.
patent: 5145774 (1992-09-01), Tarnowski et al.
patent: 5149819 (1992-09-01), Satoh et al.
patent: 5153085 (1992-10-01), Akasaki et al.

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