Abstract: An efficient, continuous process for the manufacture of aromatic aminoazo compounds from aromatic primary amines is provided which involves passing reactant streams comprising (a) the aromatic primary amine, mineral acid and water and (b) aqueous metal nitrite solution continuously through a tubular reactor and recovering the p-aminoazo compound from the exiting stream; the residence time in the reactor being less than about 10 minutes and the temperature within the reactor being between about 40.degree. C. and about 100.degree. C.

Abstract: Transition metal complexes of mono- and polynuclear aromatic o-hydroxymercaptans are produced in high yield and purity directly from o-hydroxythiocyanates by reaction thereof with water-soluble transition metal salts. When incorporated into plastic lenses, the complexes afford eye protection against laser radiation.

Abstract: Cationic dyes for paper having the formula: ##STR1## wherein R is selected from hydrogen and methyl, X is selected from 0 and NH, n is 2 or 3, and Y.sup.- is an anion selected from halide and methosulfate, have improved storage stability in aqueous acid solutions.

Abstract: A process for preparing pyridinium chloride salts of esters of 2-chloro-N-2-hydroxyethylacetamide in which no intermediates need be isolated is disclosed.

Abstract: Dyes of the formula: ##STR1## wherein M is a metal selected from calcium and magnesium and provided that where M is calcium the dye is in the beta crystalline form are superior dyes for the dyeing of fiberglass in that they are resistant to crystal growth in dye pastes and recycle process water in the dyeing of fiberglass. Thus, in the spray dyeing of the fiberglass the dyes do not tend to clog the nozzle of the spraying device as do the corresponding salts of monovalent metals, such as the sodium salt.

Abstract: Dyes of the formula: ##STR1## WHEREIN M is a metal selected from the group consisting of calcium, barium, strontium, magnesium, chromium, manganese, iron, cobalt, nickel, copper, and zinc and wherein n is an integer selected from 2 and 3 are superior dyes for the dyeing of fiberglass in that they are resistant to crystal growth in dye pastes and recycle process water in the dyeing of fiberglass thus, in the spray dyeing of the fiberglass the dyes do not tend to clog the nozzle of the spraying device as do the corresponding salts of monovalent metals, such as the disodium and dipotassium salts.

Abstract: A low molecular weight hydrolyzed polyacrylamide having exceptional effectiveness as a scale-inhibiting agent is prepared by a process involving simultaneously and continuously charging separate streams of acrylamide monomer, ammonium persulfate (as catalyst) and mercaptoalkanoic acid (as chain transfer agent) to a reaction zone containing water under reflux, the rate of charging being such that the heat of polymerization is sufficient to maintain reflux in the reaction zone without exceeding the capacity of the condenser to remove the heat of reaction, and then reacting the polymer product with sufficient aqueous caustic to hydrolyze from about 60 to 90% of the amide groups in the polymer product.

Abstract: The infrared reflectivity of cadmium stannate (Cd.sub.2 SnO.sub.4) films between 0.6 and 1.5 microns wavelength can be increased by doping the films with copper whereby the films can be used as architectural window coatings.

Abstract: A plastic composition suitable for use in devices to protect glass workers from the eye-damaging light given off by molten glass is disclosed.

Abstract: A process for recovering purified Schaeffer's Salt from a sulfonation mixture is disclosed wherein unreacted 2-naphthol is removed by activated carbon treatment, 6,6'-oxybis(2-naphthalene sulfonic acid) is selectively removed as the disodium salt at a pH above about 9, and Schaeffer's salt is then salted out at a pH in the range of 2-7.

Abstract: Cadmium stannate has been found to be useful as a window for solar heat absorbing systems in which advantage is taken of the unique optical properties of cadmium stannate. When cadmium stannate is in an electrically conductive state, having a conductivity of greater than 10.sup.3 ohm.sup.-.sup.1 cm.sup.-.sup.1, it becomes transparent to solar radiation and reflective of thermal infrared radiation. This enables the cadmium stannate to function as a window which allows passage of solar radiation through it and incident onto a black body, and at the same time serve as a reflector of thermal infrared radiation emitted from said body. This results in more efficient solar heat transfer to the solar heat collector provided with such a window.

Abstract: Cadmium stannate has been found to be useful as a window for solar heat absorbing systems in which advantage is taken of the unique optical properties of cadmium stannate. When cadmium stannate is in an electrically conductive state, having a conductivity of greater than 10.sup.3 ohm.sup..sup.-1 cm.sup..sup.-1, it becomes transparent to solar radiation and reflective of thermal infrared radiation. This enables the cadmium stannate to function as a window which allows passage of solar radiation through it and incident onto a black body, and at the same time serve as a reflector of thermal infrared radiation emitted from said body. This results in more efficient solar heat transfer to the solar heat collector provided with such a window.

Abstract: Diisocyanate halotriazine compounds of the formula: ##SPC1##Wherein X is a halogen atom are bleach activators which have high bleaching activity at low temperatures in peroxygen salt bleach compositions and do not appreciably change the shade of cotton dyed with many classes of dyes, particularly Vat Blue 6.

Abstract: Acyl nitrile compounds of the formula:A--CNwherein A represents an acyl radical selected from aroyl, substituted aroyl, cinnamoyl, and the residue of a heterocyclic acid halide, are bleach activators of high strength and good activity in peroxygen salt bleach compositions.

Abstract: Aroyl-N-hydroxyformimidoyl halides of the formula: ##EQU1## wherein Ar represents a substituted or unsubstituted aryl radical and X is halogen, are bleach activators of high strength and good activity at low temperatures in peroxygen salt bleach compositions and do not change the shade of cotton dyed with various classes of dyes, particularly Vat Blue 6.

Abstract: Cyanoformates and cyanoformamides of the formula ##EQU1## wherein A represents a radical selected from --OR and ##EQU2## said R, R.sub.1 and R.sub.2 individually being selected from lower alkyl, unsubstituted phenyl or naphthyl and substituted phenyl or naphthyl wherein the substituents are individually selected from lower alkyl, lower alkoxy, hydroxy, halo and nitro radicals are bleach activators of high strength and good activity at low temperatures in peroxygen bleaching compositions.

Abstract: A novel process for producing 2-amino-6,8-naphthalenedisulfonic acid (Amino G Acid) and 2-amino-5,7-naphthalenedisulfonic acid (Amino J Acid) which comprises heating 2-amino-1-naphthalenesulfonic acid (Tobias Acid) in 100% sulfuric acid, sulfonating the heated mixture with sulfur trioxide at a temperature in the range of 90.degree.C. to 150.degree.C. and hydrolyzing the sulfonation product.

Abstract: Novel dyes for plastic substrates which act as filters in such substrates for argon and double-frequency neodymium laser beams are sulfonamide derivatives of 12-H-naphthoperinone. These dyes are soluble in and compatible with the plastic substrate and provide stability to ultraviolet light.

Abstract: N,N,N',N'-tetraarylquinone diimonium salt infrared absorbers of improved heat stability are prepared by oxidizing an N,N,N',N'-tetraarylquinonediamine with a cupric salt, such as cupric chloride or cupric nitrate, rather than a silver salt as heretofore.

Abstract: Cadmium stannate has been found to be useful as a window for solar heat absorbing systems in which advantage is taken of the unique optical properties of cadmium stannate. When cadmium stannate is in an electrically conductive state, having a conductivity of greater than 10.sup.3 ohm.sup..sup.-1 cm.sup..sup.-1 , it becomes transparent to solar radiation and reflective of thermal infrared radiation. This enables the cadmium stannate to function as a window which allows passage of solar radiation through it and incident onto a black body, and at the same time serve as a reflector of thermal infrared radiation emitted from said body. This results in more efficient solar heat transfer to the solar heat collector provided with such a window.