2-thioalkyl-benzimidazole-5 or 6 sulphonic acids

Details 2-thioalkyl-benzimidazole-5 or 6 sulphonic acids 2-thioalkyl-benzimidazole-5 or 6 sulphonic acids

2006-03-21

2006-03-21

Richter, Johann (Department: 1626)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

Reexamination Certificate

active

07015332

ABSTRACT:
A compound represented by formula (I):a compound represented by (II):or a mixture of at least one compound represented by formula (I) with at least one compound represented by formula (II), wherein M is hydrogen, an alkali atom or an ammonium group; R1is hydrogen, a —(CH2)mSO3M group or aR2is an alkyl-, alkenyl- or alkynyl- group having 6 to 25 carbon atoms; and m is an integer between 1 and 5; the use of at least one compound represented by the above-mentioned formula (I), at least one compound represented by the above-mentioned formula (II) or a mixture of at least one compound represented by the above-mentioned formula (I) and at least one compound represented by the above-mentioned formula (II) as a surfactant; and a photographic material comprising a support and a layer containing photosensitive silver halide, characterized in that the photographic material contains at least one compound represented by the above-mentioned formula (I), at least one compound represented by the above-mentioned formula (II) or a mixture of at least one compound represented by the above-mentioned formula (I) and at least one compound represented by the above-mentioned formula (II).

REFERENCES:
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patent: 4639408 (1987-01-01), Kitaguchi et al.
patent: 6780576 (2004-08-01), Van Thillo et al.
Szulc, Henryk; “Alkylarenesulfonate Surfactants,” Chemical Abstracts Service, Acc No. 58:54318.

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