Abstract: A ferromagnetic powder and process for producing it are disclosed. The process involves providing reducing a nickel-doped or nickel-coated iron compound in a reducing gas to provide a reduced metal powder including nickel in an amount of 3 to 30 atomic % based on the atomic % of iron present in the reduced metal powder, and treating the reduced metal powder with an organic metal powder. The resulting ferromagnetic metal powder has excellent stability with respect to oxidation and has a high saturation magnetization.

Abstract: A magnetic recording medium having a non-magnetic base overlaid with a magnetic layer containing ferromagnetic particles and a binder is disclosed. The ferromagnetic particles are metal particles and the binder is composed of (a) carboxyl-containing vinyl chloride/vinyl acetate copolymer, (b) a polyurethane resin and (c) a polyisocyanate compound.

Abstract: A magnetic recording medium having a non-magnetic base overlaid with a magnetic layer containing ferromagnetic particles is disclosed. The ferromagnetic particles are metal particles and the binder is composed of (a) a nitrocellulose and (b) a polyurethane resin.

Abstract: In a photopolymerizable composition comprising, as essential components, (A) a compound having at least one ethylenically unsaturated double bond capable of undergoing addition polymerization and (B) a photopolymerization initiator, the improvement which comprises that the photopolymerization initiator comprising a combination of (a) a 5-[(arenooxazol-2-ylidene)ethylidene]-2-thiohydantoin compound represented by the general formula (I) (a 5-[(substituted benzoxazol-2'-ylidene)ethylidene]-2-thiohydantoin compound) or (II) (a 5-[substituted naphthol(1,2-D)oxazol-2-ylidene)ethylidene]-2-thiohydantoin compound) and (b) a 2,4,6-substituted-1,3,5-triazine compound represented by the formula (III): ##STR1## wherein X represents a hydrogen atom, an alkyl group, a substituted alkyl group, an alkoxy group, an aryl group, a substituted aryl group, an aryloxy group, an aralkyl group or a halogen atom; R.sup.1, R.sup.2 and R.sup.

Abstract: A magnetic recording medium which comprises a non-magnetic support having thereon a magnetic recording layer comprising ferromagnetic particles dispersed in a binder, with the magnetic layer further containing an organoaluminum compound or with the surface of the ferromagnetic particles being treated with an organoaluminum compound.

Abstract: A photopolymerizable composition comprising, as essential components,(1) a polymerizable compound having at least one ethylenically unsaturated double bond and(2) a photopolymerization initiator, the photopolymerization initiator being a combination of (a) an aromatic carbonyl compound and (b) a p-dialkylamino aromatic carbonyl compound.

Abstract: A photopolymerizable composition comprising (1) an addition-polymerizable compound having at least one ethylenically unsaturated double bond and (2) a photopolymerization initiator as essential components, the improvement which comprises the photopolymerization initiator comprising a combination of (a) a 5-isoxazolone represented by the general formula (1) and (b) an aromatic carbonyl compound, a dialkylamino aromatic carbonyl compound represented by any of formulae (2) to (5), a compound represented by the formula (6) or 2-(.alpha.-thioxophenetylidene)-3-methylnaphtho[1,2-d][1,3]-thiazoline: ##STR1## wherein in the formula (1), A.sup.1 and A.sup.2 each represent an alkyl group, an alkylcarbonyl group, an alkoxycarbonyl group, an aryl group, an arylcarbonyl group or a hydrogen atom and may be the same or different; in the formulae (2) to (5) R.sup.1 and R.sup.2 each represent an alkyl group and may be the same or different, R.sup.

Abstract: In a photopolymerizable composition comprising (1) an addition-polymerizable compound having at least one ethylenically unsaturated double bond and (2) a photopolymerization initiator as essential components, the improvement which comprises that said photopolymerization initiator is a combination of (a) p-dialkylamino aromatic carbonyl compounds represented by the general formulae (1) to (4), (b) 5-isoxazolones represented by the general formula (5) and (c) 2,4,6-substituted-1,3,5-triazines represented by the general formula (6): ##STR1## where R.sup.1, R.sup.2 and R.sup.3 each represents an alkyl group or a substituted alkyl group, which may be the same or different from one another, X represents a substituent having a Hammett's .sigma. value in the range from -0.9 to 0.7, m represents 1 or 2, A.sup.1 and A.sup.

Abstract: 2-Arylnaphtho[1,8-bc]furan-5-ones represented by general formula (I): ##STR1## wherein G represents a substituted phenyl group, an unsubstituted or substituted 1-naphthyl group and an unsubstituted or substituted 2-naphthyl group, with the substituents being selected from the group consisting of a straight chain or branched chain alkyl group having 1 to 5 carbon atoms, a straight chain or branched chain alkoxy group having 1 to 3 carbon atoms and a halogen atom; are disclosed as well as photopolymerizable compositions containing at least one of the above compounds as a photopolymerization initiator for addition polymerizable ethylenically unsaturated compounds.

Abstract: A photopolymerizable composition comprising, as essential components, (A) at least one compound having one or more addition polymerizable ethylenically unsaturated double bonds and (B) a photopolymerization initiator composition comprising (i) a combination of at least one compound (a) and at least one compound (b), (ii) a combination of at least one compound (a) and at least one compound (c) or (iii) a combination of at least one compound (a), at least one compound (b) and at least one compound (c);Wherein compound (a) is a benzoylmethylenebenzothiazolylidenethiazolidone compound selected from the group consisting of 2-benzoylmethylene-5-benzothiazolylidenethiazolidin-4-one and the substituted derivatives thereof represented by the following general formula (I): ##STR1## wherein R.sup.1, R.sup.2 and X are as defined in the specification; COMPOUND (B) IS A TERTIARY OR POLYAMINE COMPOUND SELECTED FROM THE GROUP CONSISTING OF TERTIARY AMINES REPRESENTED BY THE FOLLOWING GENERAL FORMULA (II): ##STR2## wherein R.