摘要:
Aromatic hydroxycarboxylic acids of the formula(HO--).sub.n A--COOHwhere n is 1 or 2 and A is a radical from the benzene, naphthalene, biphenyl, diphenyl ether, diphenyl sulfide or diphenyl sulfone series, are prepared by a process in which an acylated aromatic compound of the formula(R.sup.1 --CO--O--).sub.n A--CO--R.sup.2where R.sup.1 and R.sup.2 independently of one another are each unsubstituted or substituted C.sub.1 -C.sub.4 -alkyl and n and A each have the abovementioned meanings, is oxidized with oxygen in the presence of a catalyst and of a solvent at from 20.degree. to 250.degree. C. to give a carboxylic acid of the formula(R.sup.1 --CO--O--).sub.n A--COOHwhere R.sup.1, n and A have the abovementioned meanings, and the acyl group or groups is or are then eliminated.
摘要:
Novel photopolymerizable recording materials suitable in particular for producing photoresist layers and lithographic printing plates are composed of one or more photopolymerizable, olefinically unsaturated organic compounds, optionally a polymeric binder, a photopolymerization initiator, a color-forming system composed of a color former and a photooxidant, a certain benzotriazole compound as a sensitizer and optionally further additive and/or auxiliary substances.
摘要:
Polycyclic compounds of the general formula (I) ##STR1## where R.sup.1 and R.sup.2 independently of one another are each hydrogen, alkyl, cycloalkyl, unsubstituted or substituted phenyl, pyridyl or phenylalkyl, or R.sup.1 and R.sup.2 together form a trimethylene or tetramethylene group, W, X, Y and Z independently of one another are each C--R.sup.6 or nitrogen, one or more of the radicals W, X, Y or Z being C--R.sup.6, R.sup.6 is hydrogen, --CO.sub.2 R.sup.7, --CONR.sup.7 R.sup.8, cyano or hydroxymethyl and R.sup.7 and R.sup.8 are each hydrogen, alkyl, unsubstituted or substituted phenyl, cycloalkyl, a 5-membered or 6-membered heterocyclic structure or phenylalkyl, R.sup.3 and R.sup.4 are each hydrogen or R.sup.3 and R.sup.4 together form a group of the formula ##STR2## A is a chemical bond, alkylene, ##STR3## or cycloalkylene, m and o are each from 1 to 20, R.sup.9 is alkyl, cycloalkyl, phenylalkyl or unsubstituted or substituted phenyl, M is a group of the formula ##STR4## and can be bonded to A both with the nitrogen atom and with the carbon atom, and R.sup.10, R.sup.11, R.sup.12 and R.sup.13 independently of one another are each alkyl, or R.sup.10 and R.sup.11 or R.sup.12 and R.sup.13 together form a tetramethylene or pentamethylene group, B is a chemical bond, alkylene or phenylalkylene or is alkylene which is interrupted by carbonyl, carboxamide or a carboxylic ester group, R.sup.5 is hydrogen, cyano, hydroxyl, ##STR5## R.sup.14 is hydrogen, alkyl, cycloalkyl, phenylalkyl, phenyl or a 5-membered or 6-membered heterocyclic structure, or M--B--R.sup.5 is a group of the formula ##STR6## in which case A must not be a chemical bond and R.sup.15 is alkyl, R.sup.16 is hydrogen, alkyl or alkoxy and R.sup.17 is hydrogen or alkyl, have extremely good stabilizing properties and no natural color and are very compatible with organic polymers. They also have a low vapor pressure and are stable to thermal decomposition.
摘要:
A photosensitive recording element possessing a photosensitive recording layer which is applied to a dimensionally stable base, if desired on top of one or more intermediate layers, and has good photochemical properties and a long shelf life contains special sulfo-containing azo or azoxy dyes for controlling the photochemical properties in the photosensitive recording layer and/or in any intermediate layer present. Dyes which are suitable for use according to the invention can be obtained, for example, by autocondensation of 5-nitro-o-toluenesulfonic acid.
摘要:
Naphtholactam dyes of the formula ##STR1## where R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, n, p, Z.sup.1, Z.sup.2 and the rings A, B, C and D each have the meanings stated in the description, and an optical recording medium which contains one or more naphtholactam dyes and may contain a base.
摘要:
An electrophotographic recording element comprising(A) an electrically conducting base and(B) at least one photoconductive layer consisting essentially of(b.sub.1) at least one binder,(b.sub.2) at least one sensitizer which on exposure of layer (B) generates charge carriers and which is selected from the group of the naphtholactam dyes of the general structure I ##STR1## where the indices and variables have specified meanings, (b.sub.3) at least one photoconductor which transports the generated charge carriers and optionally(b.sub.4) additives, and also novel naphtholactam dyes of the general formula I where R.sup.2 is substituted monocyclic 1,3-thiazolyl bonded to the naphtholactam structure via a carbon ring atom, the use of these novel naphtholactams I in electrophotographic and laser-optical recording elements and also novel reprographic processes and novel processes for producing offset printing plates and photoresists using the novel electrophotographic recording element.
摘要:
An electrophotographic recording element comprising(A) an electrically conducting base and(B) at least one photoconductive layer consisting essentially of(b.sub.1) at least one binder,(b.sub.2) at least one sensitizer which on exposure of layer (B) generates charge carriers and which is selected from the group of the isoindolenine dyes of the general structure I ##STR1## where the index and the variables have specified meanings, (b.sub.3) at least one photoconductor which transports the generated charge carriers and optionally(b.sub.4) additives,in useful for reprographic purposes, for producing printing plates, in particular offset plates, and for producing photoresists.
摘要:
Naphtholactam dyes of the formula ##STR1## where R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, n, p, Z.sup.1, Z.sup.2 and the rings A, B, C and D each have the meanings stated in the description, and an optical recording medium which contains one or more naphtholactam dyes and may contain a base.
摘要:
A process for the isolation of 4,4'-dichlorodiphenyl sulfone from a mixture of dichlorodiphenyl sulfones in which the ratios of the masses of 2,4'-dichlorodiphenyl sulfone and 3,4'-dichlorodiphenyl sulfone to the mass of 4,4'-dichlorodiphenyl sulfone are respectively from 0.5% to 20% and from 0.5% to 30% by treating the mixture with an alkanol at temperatures of from 20.degree. C. to 250.degree. C., cooling, and separating the pure 4,4'-dichlorodiphenyl sulfone that precipitates.
摘要:
Naphtholactamsquaric acid dyes of the formula ##STR1## where R.sup.1 and R.sup.2 independently of one another are each unsubstituted or substituted C.sub.3 -C.sub.22 -alkyl, in which the alkyl chain may be interrupted by oxygen atoms, or are each unsubstituted or substituted C.sub.1 -C.sub.4 -aralkyl, unsubstituted or substituted C.sub.5 -C.sub.7 -cycloalkyl or unsubsituted or substituted phenyl, and the rings A, B, C and D are unsubstituted or substituted and/or benzofused, and optical recording materials consisting of a base and a layer which is sensitive to laser light and is composed of a thermoplastic or crosslinked polymer and one or more dyes (I).Because of the high light absorption of (I), the recording materials are very sensitive to light from the GaAlAs semiconductor laser. An excellent signal-to-noise ratio is obtained on reading the recordings.