Abstract: Describes a polymerizable organic composition comprising an aromatic monomer having at least two vinyl groups, e.g., divinyl benzene, a polythiol monomer having at least two thiol groups, e.g., pentaerythritol tetrakis(2-mercaptoacetate), and an anhydride monomer having at least one ethylenically unsaturated group, e.g., methacrylic anhydride. Polymerizable compositions according to the present invention, may optionally further comprise a polymerizable comonomer having at least two (meth)acryloyl groups, e.g., pentaerythritol tetrakis (acrylate). Polymerizates prepared from polymerizable organic compositions of the present invention have a refractive index of at least 1.57 and an Abbe number of at least 33. Also described are photochromic articles prepared from such compositions.

Abstract: Describes a method of electrochemically converting amine hydrohalide, e.g., ethyleneamine hydrochloride, into free amine, e.g., free ethyleneamine. A three compartment electrolytic cell is provided having (1) a catholyte compartment containing a cathode assembly comprising a cathode and an anion exchange membrane, (2) an anode compartment containing an anode assembly comprising either (a) a hydrogen consuming gas diffusion anode and a current collecting electrode or (b) a hydrogen consuming gas diffusion anode which is fixedly held between a hydraulic barrier and a current collecting electrode, and (3) an intermediate compartment separated from the catholyte and anode compartments by the anion exchange membrane and either (i) the hydrogen consuming gas diffusion anode or (ii) the hydraulic barrier respectively.

Abstract: Describes a method of electreochemically converting amine hydrohalide, e.g., amine hydrochloride, into free amine, e.g., free ethyleneamine. An electrolytic cell is provided having (1) a catholyte compartment containing a cathode assembly comprising a cathode and a bipolar ion exchange membrane, (2) an anode compartment containing an anode assembly comprising either (a) a hydrogen consuming gas diffusion anode and a current collecting electrode or (b) a hydrogen consuming gas diffusion anode which is fixedly held between a hydraulic barrier and a current collecting electrode, and (3) at least one pair of intermediate compartments separating the catholyte and anode compartments and separated from each other by an anion exchange membrane.

Abstract: Describes a method of electrochemically converting amine hydrohalide, e.g., ethyleneamine hydrochloride, into free amine, e.g., free ethyleneamine. A three compartment electrolytic cell is provided having (1) a catholyte compartment containing a cathode assembly comprising a cathode and anion exchange membrane, (2) an anolyte compartment containing an anode assembly comprising an anode and a cation exchange membrane, and (3) an intermediate compartment separated from the catholyte and anolyte compartments by the anion and cation exchange membranes respectively. An aqueous solution of amine hydrohalide is charged to the catholyte compartment, while hydrogen halide solutions are charged to the intermediate and anolyte compartments. Direct current is passed through the electrolytic cell and an aqueous solution comprising free amine is removed from the catholyte compartment.

Abstract: Describes a method of electrochemically converting amine hydrohalide, e.g., ethyleneamine hydrochloride, into free amine, e.g., free ethyleneamine, by charging an aqueous solution of amine hydrohalide to the catholyte compartment of an electrolytic cell, which contains a cathode, charging hydrogen gas to the anode compartment of the cell, which contains an anode assembly comprised of a hydrogen consuming gas diffusion anode fixedly held between a current collecting electrode and an anion exchange membrane. The catholyte and anode compartments of the cell are separated by the anion exchange membrane. An amine hydrohalide solution containing free amine is removed from the catholyte compartment.

Abstract: Describes nonflammable organic solvent compositions comprising 1,2-dichloroethylene and a halocarbon different than 1,2-dichloroethylene. The 1,2-dichloroethylene consists essentially of trans-1,2-dichloroethylene, cis-1,2-dichloroethylene and mixtures thereof; preferably a major amount of trans-1,2-dichloroethylene; and in particular at least 99% by weight of trans-1,2-dichloroethylene, based on the total weight of 1,2-dichloroethylene. The halocarbon is selected from the group consisting of 1,1,1,3,3,3-hexafluoroisopropanol, perfluoro-tert-butyl alcohol, 1,1,2,3,3-pentafluoropropane, 1-bromo-2-chloro-1,1,2-trifluoroethane, 1,2-dichloro-1,1,2,3,3,3-hexafluoropropane and mixtures thereof.

Abstract: Describes polymerizable organic compositions of from about 30 to 95 weight percent of a first monomer component which is an alkoxylated diol, e.g., alkoxylated bisphenol, having acrylate or methacrylate groups, i.e., dimethacrylate of bisphenol A having an average of 1 to 4 ethoxy units, and from about 5 to 70 weight percent of a second monomer component which is an alkoxylated diol, e.g., alkoxylated bisphenol, having acrylate or methacrylate groups, i.e., dimethacrylate of bisphenol A having 25 to 70 ethoxy units. Optionally there may also be present from about 0 to 65 weight percent of at least one monomer component which is selected from: (i) a monoethylenically unsaturated monomer that is polymerizable by free radical initiation; (ii) a bis?(meth)acryloyl-terminated!polyethylene glycol monomer; and (iii) a monomer having at least three terminal ethylenically-unsaturated groups. Substantially completely cured polymerizates prepared from such compositions may be used to prepare photochromic articles, e.g.

Abstract: Describes polymerizable organic compositions of from about 5 to 90 weight percent of a first monomer component which is an alkoxylated diol, e.g., alkoxylated bisphenol, having acrylate or methacrylate groups, e.g., a dimethacrylate of bisphenol A having 25 to 35 ethoxy units, and from about 10 to 95 weight percent of a second monomer component which is different than the first monomer component and has at least three acrylate or methacrylate groups. There may also be present, from 0 to about 85 weight percent of a third polymerizable monomer component which has a single ethylenically unsaturated group that is polymerizable by free radical initiation. Substantially completely cured polymerizates prepared from such compositions may be used to prepare photochromic articles, e.g., lenses, by incorporating a photochromic substance, e.g., by thermal transfer, into the polymerizate.