Process for storing information and a material having information written thereon
AssigneeCiba-Geigy Corporation
InventorsJin Mizuguchi, Gerald Giller, Alain C. Rochat
Life of this patent
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Abstract
A coated material comprising a substrate which is coated with a layer of a pyrrolopyrrole of formula I ##STR1## wherein R.sub.1 and R.sub.2 may be 4-pyridyl and X.sub.1 and X.sub.2 are O, said compound of formula I being at least partially in the form of a salt of a strong acid, is suitable for use as an optical recording material and, owing to its electrical conductivity and photoconductivity, as antistatically treated material, as sensor, photoreceptor and solar battery.
Claims20
A process for writing and storing information, which comprises changing the absorption spectrum of a recording layer by exposing the recording layer to vapors of a strong acid and subsequently irradiating the recording layer with laser light according to the input of information, wherein the recording layer is a thin layer comprising a pyrrolopyrrole of formula I or a mixture of pyrrolopyrroles of formula I ##STR10## wherein R.sub.1 is a phenyl or pyridyl radical of formula ##STR11## R.sub.2 is a group ##STR12## or has the same meaning as R.sub.1, R.sub.3 and R.sub.4 are each independently of the other C.sub.1 -C.sub.18 alkyl, C.sub.5 -C.sub.6 cycloalkyl, C.sub.1 -C.sub.18 alkyl which is substituted by --OH or --SH, or unsubstituted phenyl, benzyl or phenylethyl, or phenyl, benzyl or phenylethyl which are substituted by halogen, C.sub.1 -C.sub.12 alkyl, C.sub.1 -C.sub.12 alkoxy, cyano or nitro, or, together with the linking nitrogen atom, are a 5- or 6-membered heterocyclic radical selected from the group consisting of pyrrolidinyl, piperidyl, pyrrolyl, imidazolyl, pyrazolyl, triazolyl, piperazinyl, morpholinyl and thiomorpholinyl, R.sub.5 to R.sub.8 are each independently of one another hydrogen, halogen, C.sub.1 -C.sub.12 alkyl, C.sub.1 -C.sub.12 alkoxy, C.sub.1 -C.sub.12 alkylmercapto or cyano, and X.sub.1 and X.sub.2 are each independently of the other O or S.
A material having information written thereon, wherein the material comprises a substrate and a recording layer the recording layer contains the information in the form of bits of higher or lower absorption than their environment in the recording layer, wherein the recording layer is a thin layer of a pyrrolopyrrole of formula I or a mixture of pyrrolopyrroles of formula I ##STR16## wherein R.sub.1 is a phenyl or pyridyl radical of formula ##STR17## R.sub.2 is a group ##STR18## or has the same meaning as R.sub.1, R.sub.3 and R.sub.4 are each independently of the other C.sub.1 -C.sub.18 alkyl, C.sub.5 -C.sub.6 cycloalkyl, C.sub.1 -C.sub.18 alkyl which is substituted by --OH or --SH, or unsubstituted phenyl, benzyl or phenylethyl, or phenyl, benzyl or phenylethyl which are substituted by halogen, C.sub.1 -C.sub.12 alkyl, C.sub.1 -C.sub.12 alkoxy, cyano or nitro, or, together with the linking nitrogen atom, are a 5- or 6-membered heterocyclic radical selected from the group consisting of pyrrolidinyl, piperidyl, pyrrolyl, imidazolyl, pyrazolyl, triazolyl, piperazinyl, morpholinyl and thiomorpholinyl, R.sub.5 to R.sub.8 are each independently of one another hydrogen, halogen, C.sub.1 -C.sub.12 alkyl, C.sub.1 -C.sub.12 alkoxy, C.sub.1 -C.sub.12 alkylmercapto or cyano, and X.sub.1 and X.sub.2 are each independently of the other O or S, which thin layer is exposed to vapors of a strong acid, prior to writing the information, such that the absorption maxima of the recording layer is reversibly shifted.
Dependencies are inferred from the claim text.