Abstract:
A homopolymer formed from monomers which contain groupings which are at least trinuclear, which are capable of absorbing the electromagnetic radiation of visible light, and which are structured so that in their thermodynamically stable state they are distended and strongly anisometric, is disclosed. The trinuclear groups of the homopolymer include at least one electron-attracting substituent which gives rise to a dipole moment which forms an angle of at least 20° with the longitudinal axis of the trinuclear groups. The homopolymer contains covalently bonded side groups branching from the backbone represented by the following formula, —§—T—Q—E. In the formula: § represents one of oxygen, sulphur and NR1; T represents a (CH2)n radical, optionally interrupted by, for example, —O—; Q represents a divalent linking group; and E represents the trinuclear group, e.g., represented by the following formula (VII),
Abstract:
The invention concerns an electrochrome system comprising a mixture of reducible and oxidizable substances RED1 and OX2, at lest one RED1′-OX2′ pair being covalently interlinked via a bridge and, for at least one RED1″ or OX2″ substance, the reciprocal conversion of the oxidized form and the reduced form being brought about by the fracture or formation of a &sgr;-bond. The electrochrome system is characterized by simplified electron transfer and reduced secondary reactions.
Abstract:
The invention provides an optical method which permits, with the aid of 6 simple measurements, a conclusion regarding the suitability of antennas (groups which can absorb electromagnetic radiation) for incorporation into photoaddressable polymers.
Abstract:
There has been found 1) a method for reducing the toxicity of spent liquors from dyeing with cationic dyes or mixtures thereof, characterized by the step of dyeing with cationic dyes having a computed electrostatic shielding energy (idealized hydration energy) of .gtoreq.50 kcal/mol, 2) cationic, generally low toxicity dyes, their preparation and use for dyeing.
Abstract:
Cationic 1,3,4-thiadiazolyldiphenylamine dyestuffs and corresponding anhydro bases, the dyestuffs having the formula (I) ##STR1## their preparation and their use, and materials dyed with such dyestuffs.
Abstract:
Novel substrates bearing visible information applied thereto give indiscernible, for example illegible, photocopies when the information applied using colorant combinations of at least one emitting and at least one reflecting colorant whose shades upon viewing without fluorescence being perceived are similar or identical.
Abstract:
Cationic 1,3,4-thiadiazole dyestuff of the formula ##STR1##in whichR.sup.1 and R.sup.2, independently of one another, denote hydrogen, alkyl, alkenyl, cycloalkyl, aralkyl, aryl, a heterocycle, said heterocycle having a direct bond to the nitrogen atom, or being bound through a methylene or ethylene group, or R.sup.1 and R.sup.2, together with the nitrogen atom to which they are attached form a heterocycle,R.sup.3 denotes alkyl, alkenyl or aralkyl,R.sup.4 denotes hydrogen or alkyl,R.sup.5 denotes acyl,R.sup.6 and R.sup.7, independently of one another, denote hydrogen, alkyl, alkoxy, aryloxy or halogen andR.sup.8 and R.sup.9, independently of one another, denote hydrogen, alkyl, alkenyl, cycloalkyl, aralkyl, aryl, a heterocycle, said heterocycle having a direct bond to the nitrogen atom, or being bound through a methylene or ethylene group, or R.sup.8 and R.sup.9, together with the nitrogen atom to which they are attached form a heterocycle, orR.sup.6 and R.sup.8 together with the nitrogen to which R.sup.8 is attached completes a heterocyclic, said R.sup.6 and R.sup.8 having a total of from 2 to 4 atoms, one of which can be oxygen or nitrogen, said heterocyclic being either unsubstituted or substituted with from 1 to 3 alkyl groups orR.sup.7 and R.sup.9, together with the nitrogen to which R.sup.9 is bound completes a heterocyclic, said R.sup.7 and R.sup.9 having a total of from 2 to 4 atoms, one of which may be oxygen or nitrogen, said heterocyclic being either unsubstituted or substituted with from 1 to 3 alkyl groups, andX.sup.e denotes an anion andin which all alkyl, alkenyl, cycloalkyl, aralkyl, aryl, alkoxy and heterocyclic radicals present may be substituted by nonionic substitutents, carboxyl groups, ammonium groups and/or pyridinium groups wherein the nonionic substituents are substituents selected from the group consisting of cyano, hydroxyl, fluorine, chlorine, bromine, nitro, alkyl, monoalkylamino, dialkylamino, alkoxy, phenyl, acyloxy, acylamino, alkoxycarbonyl and alkoxycarbonyloxy.
Abstract:
Bis(indolyl)ethylenes of the formula ##STR1## wherein R.sub.1 denotes hydrogen, alkyl, aralkyl or aryl,R.sub.2 denotes hydrogen, alkyl or aryl,R.sub.3 denotes hydrogen, alkyl, alkenyl, COOH or aryl andR.sub.4 denotes hydrogen, alkyl, alkoxy, cycloalkoxy or halogen, andthese substituents, in turn, can carry non-ionic radicals or a carboxyl group, are obtained by reaction of indoles of the formula ##STR2## with carboxylic acids of the formulaR.sub.3 --CH.sub.2 --COOH (III)their chlorides, esters, for example alkyl esters, or anhydrides in the presence of phosphorus oxychloride.
Abstract:
Compounds of the formula ##STR1## wherein Z.sup.1 denotes hydrogen, alkyl, cycloalkyl or ##STR2## R.sup.1 denotes hydrogen, alkyl, cycloalkyl, aralkyl, aryl, heteroalkyl or heteryl,X.sup.1, X.sup.2 and X.sup.3 denote hydrogen, halogen, alkyl, cycloalkyl, aryl, alkanoylamino, aroylamino or heteryl, and at least one of these radicals denotes NH.sup.1 Y.sup.2, OY.sup.3 or SY.sup.3,Y.sup.1, Y.sup.2 and Y.sup.3 denote hydrogen, alkyl, cycloalkyl, aralkyl, aryl or heteryl andY.sup.1 +Y.sup.2 denote the remaining members of a 5-membered or 6-membered ring which optionally contains further hetero-atoms,are outstandingly suitable as colour-forming agents for pressure-sensitive, heat-sensitive and electrosensitive recording materials with an acid developer. Deep copies which are fast to light are obtained.
Abstract:
The invention relates to chromogenic 3,1-benzoxazines of the formula ##STR1## wherein X.sup.1 denotes hydrogen, C.sub.1 -C.sub.4 -alkyl, chlorine or OY.sup.1,X.sup.2 denotes NY.sup.2 Y.sup.3,X.sup.3 denotes OY.sup.4 or NY.sup.5 Y.sup.6,R.sup.1 -R.sup.3 independently of one another denote hydrogen, C.sub.1 -C.sub.4 -alkyl, chlorine, C.sub.1 -C.sub.4 -alkoxy or C.sub.1 -C.sub.4 -mono- or -dialkylamino, orR.sup.1 together with Y.sup.2,R.sup.2 or R.sup.3 together with Y.sup.4 or Y.sup.5, orR.sup.2 and R.sup.3 simultaneously with Y.sup.5 and Y.sup.6 denote a 2 to 4-membered bridge which can contain one oxygen atom or one nitrogen atom and can carry up to 4 methyl groups, and whereinR.sup.1 and R.sup.3 simultaneously represent hydrogen only if R.sup.2 with Y.sup.4 or Y.sup.5 forms one of the abovementioned bridges,R.sup.4 denotes hydrogen, methyl or chlorine,Y.sup.1 and Y.sup.4 independently of one another denote C.sub.1 -C.sub.4 -alkyl, cyclohexyl or benzyl and Y.sup.2, Y.sup.3, Y.sup.5 and Y.sup.6 independently of one another denote hydrogen, C.sub.1 -C.sub.4 -alkyl, cyclohexyl or benzyl,are used for pressure-copying, thermoreactive or electrochromic recording materials.