Abstract: A polymer composition having a modified absorption and transmission characteristic particularly suited for photoreactors or photobioreactors made of plastic molded parts and exposed to sunlight or suitable artificial light sources, the polymer selectively comprises the following substances or a combination thereof in addition to the conventional standard additives: an inorganic or organic near infrared absorber for absorbing long-wavelength radiation, an inorganic or organic reflector for reflecting ultraviolet radiation, an inorganic or organic reflector for reflecting visible, near infrared, or infrared radiation, an optical brightener or fluorescent dye for converting the absorbed ultraviolet radiation into visible light or fluorescent light, a photochromic dye for modifying the transmission characteristic of the plastic molded part as a function of light intensity, and an antimicrobial additive for preventing or reducing organic deposits in the photobioreactor.

Abstract: Carbonyloxy-substituted azulenesquaric acid dyes of the formula ##STR1## where L is C.sub.1 -C.sub.12 -alkylene which may be substituted by phenyl,R.sup.1 is C.sub.1 -C.sub.12 -alkyl, monounsaturated or polyunsaturated C.sub.3 -C.sub.12 -alkenyl, which may be phenyl-substituted, C.sub.3 -C.sub.7 -cycloalkyl, C.sub.3 -C.sub.7 -cycloalkenyl, substituted or unsubstituted phenyl, pyrrolyl, furanyl, thienyl or pyridyl andR.sup.2, R.sup.3, R.sup.4 and R.sup.5 are each independently of the others hydrogen or substituted or unsubstituted C.sub.1 -C.sub.12 -alkyl,with the proviso that when R.sup.3 is hydrogen the positions of the substituents CH.sub.2 --L--O--CO--R.sup.1 and R.sup.4 on either or both azulene rings may also be interchanged with each other within an azulene ring, are useful in an optical recording medium.

Abstract: Polymethine dyes suitable for use in an optical recording medium have the formula ##STR1## where p is 0 or 1,Z is nitrogen, oxygen, sulfur, isopropylidene, cyclohexylidene or the radical --CH.dbd.CH--,Q is a radical of the formula ##STR2## where R.sup.2 is hydrogen, chlorine, bromine or C.sub.1 -C.sub.6 -alkyl, L is C.sub.1 -C.sub.12 -alkylene, or a single bondR.sup.1 is hydrogen, substituted or unsubstituted C.sub.1 -C.sub.20 -alkyl, substituted or unsubstituted C.sub.5 -C.sub.7 -cycloalkyl or substituted or unsubstituted phenyl,X.sup..crclbar. is an anion, and the rings A may each be substituted or benzofused.

Abstract: Binary azulenesquaric acid dyes of the formula ##STR1## where X is a bridging member, Y is hydrogen, cyano or formula CO--OR.sup.5, CO--NHR.sup.5, OR.sup.5, O--CO--OR.sup.5, NH--CO--R.sup.5, NH--CO--OR.sup.5 or NH--SO.sub.2 --R.sup.5, where R.sup.5 is hydrogen, C.sub.1 -C.sub.12 -alkyl, C.sub.2 -C.sub.12 -alkenyl, C.sub.5 -C.sub.7 -cycloalkyl or unsubstituted or substituted phenyl, L.sup.1 and L.sup.2 are each, independently of one another, a chemical bond or unsubstituted or substituted C.sub.1 -C.sub.12 -alkylene and R.sup.1, R.sup.2, R.sup.3, R.sup.4, Q.sup.1, Q.sup.2, Q.sup.3 and Q.sup.4 are each, independently of one another, hydrogen or unsubstituted or substituted C.sub.1 -C.sub.12 -alkyl, their intermediates and an optical recording medium containing the novel dyes are described.

Abstract: An optical recording medium consists essentially of a base material and a light-absorbing layer which contains a thermoplastic binder and at least one dye, wherein the thermoplastic binder is a polycyclic hydrocarbon which has a glass transition temperature Tg of greater than 150.degree. C. and is soluble to more than 3% by weight in an aliphatic or aromatic hydrocarbon.

Abstract: Amido-containing azulene-aquaric acid dyes of the formula ##STR1## where L is C.sub.1 -C.sub.12 -alkylene which may be substituted by phenyl,R.sup.1 and R.sup.2 are each independently of the other hydrogen, substituted or unsubstituted C.sub.1 -C.sub.20 -alkyl, C.sub.5 -C.sub.7 -cycloalkyl, substituted or unsubstituted phenyl, 2,2,6,6-tetramethylpiperidin-4-yl or cyclohexylaminocarbonyl andR.sup.3, R.sup.4, R.sup.5 and R.sup.6 are each independently of the others hydrogen or substituted or unsubstituted C.sub.1 -C.sub.12 -alkyl,with the proviso that when R.sup.6 is hydrogen the positions of the substituents CH.sub.2 --L--CO--NR.sup.1 R.sup.2 and R.sup.5 on either or both azulene rings may also be interchanged with each other within an azulene ring are used in an optical recording medium.

Abstract: Methine dyes of the formula ##STR1## where R.sup.1, R.sup.2, R.sup.3, R.sup.4, X, Y and the rings A and B each have specific meanings, and methine dyes obtainable by reacting an organic mono- or polyisocyanate with such a methine dye of the abovementioned formal where only the radicals R.sup.1 and/and R.sup.4 have a group reacting with an organic mono- or polyisocyanate are useful in optical recording media.

Abstract: Azulenesquaric acid dyes of the formula ##STR1## where L is substituted or unsubstituted C.sub.1 -C.sub.12 - alkylene,R.sup.1 is C.sub.1 -C.sub.20 - alkyl, C.sub.5 -C.sub.7 - cycloalkyl or substituted or unsubstituted phenyl andR.sup.2, R.sup.3, and R.sup.5 are each independently of the others hydrogen or substituted or unsubstituted C.sub.1 -C.sub.12 -alkyl,with the proviso that when R.sup.5 is hydrogen the positions of the substituents CH.sub.2 --L--O--CO--NHR.sup.1 and R.sup.4 on an azulene ring may also be interchanged within a ring in either or both of the azulene rings, derived from azulene intermediates that contain urethane groups, are suitable for use in an optical recording medium.

Abstract: Azulenesquaric acid dyes of the formula ##STR1## where R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 each have specified meanings are prepared from azulene derivatives of the formula ##STR2## where R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 each have specified meanings as intermediates, and used in an optical recording medium.

Abstract: Quinoxalinepentamethine dyes of the formula ##STR1## where R.sup.1 is hydrogen, substituted or unsubstituted C.sub.1 -C.sub.22 -alkyl or substituted or unsubstituted C.sub.5 -C.sub.7 -cycloalkyl,R.sup.2 is hydrogen, chlorine, bromine or C.sub.1 -C.sub.6 -alkyl,Y is a radical of the formula --N.dbd.C(CH.sub.3)-- or --N(R.sup.1)--CO--, where R.sup.1 is as defined above,Z.sup.1 and Z.sup.2 are each hydrogen or together are unsubstituted or substituted C.sub.2 -C.sub.3 -alkylene,X.sup..crclbar. is an anion andthe rings A and B independently of each other may be substituted and/or benzofused and are useful in optical recording media.

Abstract: Naphtholactamtrimethine dyes useful in optical recording media have the formula ##STR1## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are identical or different and each is independently of the others C.sub.1 -C.sub.22 -alkyl, which may be substituted and/or interrupted by one or more oxygen atoms, one or more imino groups or one or more C.sub.1 -C.sub.4 -alkylimino groups, or is substituted or unsubstituted C.sub.5 -C.sub.7 -cycloalkyl or substituted or unsubstituted phenyl, and the rings A, B, C and D may each be substituted and/or benzofused.

Abstract: An optical recording medium comprises a support material and a light-absorbing layer consisting essentially of a soluble mixture of a thermoplastic binder and at least one dye, wherein the thermoplastic binder is a phenol-aldehyde resin having an average molecular weight of greater than 300 which is soluble in an alcohol having a boiling point of less than 200.degree. C.

Abstract: Metal-containing or metalfree, monosubstituted or disubstituted phthalocyanines I which have one or two of the following radicals R as substituents on their benzene rings: R=bromine, cyano, C.sub.1 -C.sub.3 -alkyl, n-butyl, i-butyl, C.sub.5 -C.sub.20 -alkyl, C.sub.5 -C.sub.10 -cycloalkyl, fluorinated C.sub.1 -C.sub.6 -alkyl, C.sub.6 -C.sub.20 -aryl, XR.sup.1, where X is oxygen, sulfur, selenium, tellurium or imino (NH) and R.sup.1 is C.sub.1 -C.sub.6 -alkyl, fluorinated C.sub.1 -C.sub.6 -alkyl or C.sub.6 -C.sub.20 -aryl, or Si(R.sup.2).sub.3, where R.sup.2 is C.sub.1 -C.sub.6 -alkyl, each and every substituted benzene ring being substituted by only one R radical, are useful in Laser-optical recording materials.

Abstract: 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.

Abstract: 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.

Abstract: Tetraphenyldithiolene complexes of the formula ##STR1## and novel asymmetrically substituted benzoins of the formula ##STR2## where X.sup.1, X.sup.2 and X have the meanings stated in the description and Me is nickel, palladium or platinum. The complexes have very high absorption in the range from 800 to 950 nm and are readily soluble in the plastics used for the production of optical recording materials.The recording materials produced using these complexes have a very high signal/noise ratio.