Xanthene dye complexes
First Claim
Patent Images
1. An ionically bonded compound of the formula (I)
wherein X represents an anionic xanthene dye and Y represents a gegen ion selected from the group consisting of sulfonium, phosphonium, iodonium, pyrylium, hydrazinium and hydrazide ions and n is 1 or 2.
1 Assignment
0 Petitions
Accused Products
Abstract
Photooxidizable dye complexes of the formula (I):
X.sup.-n [Y.sup. ].sub.n (I)
where X is a xanthene dye and Y is gegen ion selected from sulfonium, phosphonium, iodonium, pyrylium, hydrazinium, and hydrazide ions; and n is 1 to 2; the complexes are useful as photoinitiators or in photobleachable imaging systems.
-
Citations
19 Claims
- 1. An ionically bonded compound of the formula (I)
- space="preserve" listing-type="equation">X.sup.-n [Y.sup. ].sub.n (I)
wherein X represents an anionic xanthene dye and Y represents a gegen ion selected from the group consisting of sulfonium, phosphonium, iodonium, pyrylium, hydrazinium and hydrazide ions and n is 1 or 2.
-
2. The compound of claim 1 wherein X is selected from the group consisting of Rose Bengal, Eosin, Erythrosin and Fluoroscein dyestuffs and esters thereof.
-
3. The compound of claim 2 wherein X is Rose Bengal or Rose Bengal benzyl ester.
-
4. The compound of claim 3 wherein Y is a phosphonium ion.
-
5. The compound of claim 4 wherein Y is selected from the group consisting of triphenylaryl phosphonium ions, triphenylalkyl phosphonium ions, tetraalkyl phosphonium ions and triphenoxybromophosphonium ion.
-
6. The compound of claim 3 wherein Y represents an iodonium ion.
-
7. The compound of claim 6 wherein said iodonium ion diphenyliodonium ion or an iodonium ion of the formula ##STR21## where t is 1, 2 or 3.
-
8. The compound of claim 3 wherein Y is a hydrazinium ion or a hydrazide ion.
-
9. The compound of claim 8 wherein said hydrazinium or hydrazide ion is selected from the group consisting of NH3 NH2 , NH3 NHCONHNH230 , and N(CH3)3 CH2 CONHNH2 .
-
10. The compound of claim 3 wherein Y is a sulfonium ion.
- 11. The compound of claim 3 wherein Y is a sulfonium ion of the formula
- space="preserve" listing-type="equation">R.sub.3 S.sup.
where R3 can be the same or different and is an alkyl group, a cycloalkyl group, an aryl group, an alkynyl group, a--CH2 COOC2 H5 group or a --CH2 COC6 H5 group.
-
12. The compound of claim 3 wherein Y is a pyrylium ion.
-
13. The compound of claim 12 wherein Y is a pyrylium ion of the formula ##STR22## where R4, R5 R6 and may be the same or different and are selected from the group consisting of alkyl, aryl, and alkoxycarbonyl or the R6 group may combine with the adjacent carbon atom to form a tetramethylene chain.
-
14. The compound of claim 3 wherein X is a Rose Bengal C-2'"'"' ester wherein the ester moiety is selected from the group consisting of ##STR23## (CH2)3 COOC2 H5, (CH2)10 COOC2 H5, CH2 COOC2 H5, P-CH2 C6 H5 COOC2 H5.
-
15. The compound of claim 1 wherein said compound is capable of generating a free radical upon exposure to light.
-
16. The compound of claim 1 wherein said compound is photooxidizable.
-
17. The compound of claim 1 wherein said compound is photobleachable.
-
18. The compound of claim 1 wherein said compound is characterized in that following exposure of said compound to light, said dye is excited to a singlet state which is quenched by said gegen ion.
-
19. The compound of claim 15 wherein said compound is capable of initiating free radical polymerization upon exposure to light.
Specification