Abstract: The invention relates to photochromic transparent organic materials particularly useful for the production of photochromic organic ophthalmic lenses. The material includes an optical-quality polymer matrix and at least one coloring agent giving photochromic properties to the matrix. The coloring agent is chosen from the group of the spirooxazins the spiropyrans, and the chromenes. The polymer of the matrix is chosen from the group of homopolymers of ethyoxylated bisphenol A dimethacrylate with formula I: in which R is H or CH3, and m and n independently represent 1 or 2, and of the copolymers of this dimethacrylate containing at most 30 wt % of an aromatic monomer with vinyl, acrylic or methacrylic functionality.

Abstract: The invention relates to photochromic transparent organic materials particularly useful for the production of photochromic organic ophthalmic lenses. The material includes an optical-quality polymer matrix and at least one coloring agent giving photochromic properties to the matrix. The coloring agent is chosen from the group of the spirooxazins the spiropyrans, and the chromenes.

Abstract: The invention relates to photochromic transparent organic materials particularly useful for the production of photochromic organic ophthalmic lenses. The material includes an optical-quality polymer matrix and at least one coloring agent giving photochromic properties to the matrix. The coloring agent is chosen from the group of the spirooxazins the spiropyrans, and the chromenes. The polymer of the matrix is chosen from the group of homopolymers of ethyoxylated bisphenol A dimethacrylate with formula I: in which R is H or CH3, and m and n independently represent 1 or 2, and of the copolymers of this dimethacrylate containing at most 30 wt % of an aromatic monomer with vinyl, acrylic or methacrylic functionality.

Abstract: The invention relates to photochromic transparent organic materials particularly useful for the production of photochromic organic ophthalmic lenses. The material includes an optical-quality polymer matrix and at least one coloring agent giving photochromic properties to the matrix. The coloring agent is chosen from the group of the spirooxazins the spiropyrans, and the chromenes. The polymer of the matrix is chosen from the group of homopolymers of ethyoxylated bisphenol A dimethacrylate with formula I: ##STR1## in which R is H or CH.sub.3, and m and n independently represent 1 or 2, and of the copolymers of this dimethacrylate containing at most 30 wt % of an aromatic monomer with vinyl, acrylic or methacrylic functionality.

Abstract: Device for separating the liquid and solid constituents of a chemical reaction mixture (1), comprising a metal filtering needle (12) provided with lateral holes (5) and able to pass through polymeric- or rubber-type membranes (3) without the latter losing their gastightness (2), a suction source (7) capable of sucking out a liquid from a closed vessel (8), a liquid evacuation channel (6) and an end-piece (4).

Abstract: The invention relates to organic photochromic materials consisting of a polymer matrix of optical quality and of at least one dye that imparts photochromic properties to the matrix, the dye being selected from spirooxazines, spiropyrans and chromenes. The polymer constituting the matrix is a copolymer of 30-95 wt % ethoxylated bisphenol A dimethacrylate and 5-70 wt % of a polyurethane oligomer having terminal di- or triacrylic or di- or trimethacrylic functionality. Such photochromic materials are most suitable for the production of ophthalmic and sun protection lenses.

Abstract: The invention relates to a process for recovering and purifying the molybdenum from a solution containing more molybdenum than vanadium.The process of the invention comprises the step of contacting the solution which contains molybdenum and vanadium, originally at a pH at least equal to 11 with an excess of an ammonium salt sufficient to precipitate the greatest part of vanadium in the form of solid ammonium vanadate, this excess being yet hot higher than a value such that after precipitation of vanadium, the quantity of ammonium having not reacted with the vanadate would be over a concentration which would account for risks of precipitating also molybdenum which is contained in the liquid phase of the supernatant.The molybdenum which is obtained is of industrial grade.

Abstract: Uranium is recovered from alkaline leach liquors of uranium ores by treating the leach liquors with an ion exchange resin in the ammonium form to provide a solution of salts and complexes of uranium and ammonium from which the uranium is separated by treating with heat or an acid.

Abstract: An apparatus for the treatment of at least one surface of an article conted therein is disclosed. The treatment apparatus comprises a treatment enclosure which includes at least one inlet lock-chamber and at least one outlet lock-chamber with an article transport device extending therebetween. The treatment enclosure includes a solvent dispenser which is positioned with an outlet thereof adjacent the article transport device. Included within the apparatus is a vapor extractor for extracting air-solvent vapors from the treatment enclosure. The vapors extracted from the treatment enclosure are directed through a condenser positioned between the inlet lock-chamber and the outlet lock-chamber. Recycling ducts, communicating with the treatment enclosure and the vapor extractor, are also provided for recycling air, from which the solvent vapors have been substantially removed, toward the inlet of the inlet lock-chamber and the outlet of the outlet lock-chamber.

Abstract: Compounds of the formula: ##STR1## in which R.sub.1 is hydrogen, optionally halogenated alkyl, optionally halogenated cycloalkyl, optionally halogenated alkenyl, optionally halogenated aralkenyl or aryloxyalkenyl mono or bicyclic aryl (optionally substituted by halogen, alkyl, trifluoromethyl, nitro, cyano, amino, hydroxyl, alkoxy, aminosulphonyl or alkylcarbonyloxy), or monocyclic or bicyclic heterocyclic of 5-11 chain members and having one or two hetero-atoms (optionally substituted), and R.sub.2 is a carboxylic acid group or a salt or ester thereof, is found to have plant growth regulating activity.

Abstract: Plant growth-regulating compounds of the formula ##STR1## wherein X and Y are separately oxygen, sulfur, N-B where B is hydrogen, lower alkyl, or acyl; R and R' are separately lower alkyl, acyl, amido, or form a cycle with ##STR2## corresponding to the formula ##STR3## in which R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are separately hydrogen, lower alkyl, halogen-substituted lower alkyl, NO.sub.

Abstract: New derivatives of hydrazinium phosphites, their preparation and fungicidal compositions in which they are present are described. The new fungicidal derivatives have the formula ##STR1## in which R.sub.1 =H, or an alkyl radical containing from 1 to 4 carbon atoms, and R.sub.2 =H, or a phenyl nucleus which is optionally substituted by one or more of the following atoms or radicals: halogen, alkyl radicals, containing from 1 to 4 carbon atoms, and the nitro radical; however, it is not possible for R.sub.1 and R.sub.2 to simultaneously represent a hydrogen atom. These products can be used in agriculture for combating fungal diseases in plants.

Abstract: Plant growth-regulating compounds of the formula ##STR1## wherein X and Y are separately oxygen, sulfur, N-B where B is hydrogen, lower alkyl, or acyl; R and R' are separately lower alkyl, acyl, amido, or form a cycle with ##STR2## corresponding to the formula ##STR3## in which R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are separately hydrogen, lower alkyl, halogen-substituted lower alkyl, NO.sub.

Abstract: Plant growth-regulating compounds of the formula ##STR1## wherein X and Y are separately oxygen, sulfur, N--B where B is hydrogen, lower alkyl, or acyl; R and R' are separately lower alkyl, acyl, amido, or form a cycle with ##STR2## corresponding to the formula ##STR3## in which R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are separately hydrogen, lower alkyl, halogen-substituted lower alkyl, NO.sub.

Abstract: Compounds having an effect on modifying the physiology of plants in various ways have the formula ##STR1## wherein R is H, alkyl, halogenated alkyl, cycloalkyl, naphthyl, phenyl or halogenated phenyl, and R is preferably alkyl of 2-5 carbons, naphthyl, phenyl or chlorinated phenyl.

Abstract: Compounds corresponding to the general formula: ##STR1## in which R represents hydrogen, an alkyl radical, a halogenated alkyl radical, a cycloalkyl radical, an optionally substituted aryl radical, an optionally substituted aralkyl radical, an acyl radical, aroyl radical or an optionally substituted heterocycle;R.sub.3 represents hydrogen, aralkyl radical containing 1 to 5 carbon atoms;R.sub.2 represents hydrogen, an alkyl radical (optionally halogenated or substituted by a hydroxyl), a formyl radical, an acyl radical, a carbamoyl radical monosubstituted or disubstituted on the nitrogen;R and R.sub.2 cannot both represent hydrogen;X represents oxygen or sulphur, and their salts, especially their sulphonium salts. Such compounds are useful for modifying the growth of plants.

Abstract: Compounds corresponding to the general formulae: ##EQU1## in which R represents hydrogen, an alkyl radical, a halogenated alkyl raal, a cycloalkyl radical, an optionally substituted aryl radical, an optionally substituted aralkyl radical, an acyl radical, aroyl radical or an optionally substituted heterocycle;R.sub.1 and R.sub.3, which may be the same or different, represent hydrogen, aralkyl radical containing 1 to 5 carbon atoms;R.sub.2 represents hydrogen, an alkyl radical (optionally halogenated or substituted by a hydroxyl), a formyl radical, an acyl radical, a carbamoyl radical monosubstituted or disubstituted on the nitrogen;R and R.sub.2 cannot both represent hydrogen;R.sub.4 is the carboxylic acid radical or one of its ester, amide, nitrile derivatives or a salt of an alkaline metal, alkaline-earth metal or heavier metal, in which case several molecules (1) can be associated with the metal atom;X represents oxygen or sulphur, and their salts, especially their sulphonium salts.

Abstract: The present invention discloses a synergistic herbicidal mixture for controlling weeds in cultures of leguminosae and solana, especially potatoes, which contains as active ingredient a mixture of 2-methylthio-4-ethylamino-6-tert. butylamino-s-triazine and of N-p-bromophenyl-N'-methyl-N'-methoxy urea.