A process for preparing an aromatic isocyanate by direct carbonylation of a nitro aromatic compound by reacting the nitro aromatic compound with carbon monoxide in the presence of a catalyst, characterized in that the catalyst contains a multi metallic material comprising one or more binary intermetallic phases of the general formula A.sub.xB.sub.y wherein: A is one or more element selected from Ni, Ru, Rh, Pd, Ir, Pt and Ag, B is one or more element selected from Sn, Sb, Pb, Zn, Ga, In, Ge and As, x is in the range 0.1-10, y in is in the range 0.1-10.

A process for preparing an aromatic isocyanate by direct carbonylation of a nitro aromatic compound by reacting the nitro aromatic compound with carbon monoxide in the presence of a catalyst, characterized in that the catalyst contains a multi metallic material comprising one or more binary intermetallic phases of the general formula A.sub.xB.sub.y wherein: A is one or more element selected from Ni, Ru, Rh, Pd, Ir, Pt and Ag, B is one or more element selected from Sn, Sb, Pb, Zn, Ga, In, Ge and As, x is in the range 0.1-10, y in is in the range 0.1-10.

The embodiments provide processes for preparing a diisocyanate composition and an optical lens, which are excellent in yield and quality with mitigated environmental problems by using a solid triphosgene composition instead of phosgene gas in the process of preparing a diisocyanate from a diamine through a hydrochloride thereof and by controlling the content of a decomposition product in a triphosgene composition, the b* value according to CIE color coordinate of the triphosgene composition in an organic solvent, or the content of water in the triphosgene.

An isocyanate composition according to the present invention contains: a difunctional or more-functional isocyanate compound; and 1.0 ppm by mass to 1.0 × 10.sup.4 ppm by mass, based on the isocyanate compound, of a compound having at least one unsaturated bond excluding unsaturated bonds constituting an aromatic ring, the compound being different from the isocyanate.

An isocyanate composition according to the present invention contains: a difunctional or more-functional isocyanate compound; and 1.0 ppm by mass to 1.0 × 10.sup.4 ppm by mass, based on the isocyanate compound, of a compound having at least one unsaturated bond excluding unsaturated bonds constituting an aromatic ring, the compound being different from the isocyanate.

An object of the present invention is to provide a transfer film capable of suppressing a corrosion of a wiring line and an electrode. In addition, an object of the present invention is to provide a method for producing a laminate using the transfer film. In addition, an object of the present invention is to provide a novel blocked isocyanate compound. The transfer film of the present invention has a temporary support and a photosensitive composition layer disposed on the temporary support, in which the photosensitive composition layer includes an alkali-soluble resin, a polymerizable compound, a polymerization initiator, and a blocked isocyanate compound having an NCO value of 4.5 mmol/g or more.

An object of the present invention is to provide a transfer film capable of suppressing a corrosion of a wiring line and an electrode. In addition, an object of the present invention is to provide a method for producing a laminate using the transfer film. In addition, an object of the present invention is to provide a novel blocked isocyanate compound. The transfer film of the present invention has a temporary support and a photosensitive composition layer disposed on the temporary support, in which the photosensitive composition layer includes an alkali-soluble resin, a polymerizable compound, a polymerization initiator, and a blocked isocyanate compound having an NCO value of 4.5 mmol/g or more.

A method for the preparation of isocyanates in which: (i) a first organosilicon compound having at least one silicon atom Si.sup.1 and a unit of formula G-I bound thereto

##STR00001##

is converted to a third organosilicon compound having a unit of formula G-II

##STR00002##

by silylation of the NH group of the unit of formula G-I with a second organosilicon compound having one silicon atom Si.sup.2; and (ii) the third organosilicon compound is reacted to an isocyanate by thermolysis, whereby the unit of formula G-II is converted to an isocyanate group.

A method for the preparation of isocyanates in which: (i) a first organosilicon compound having at least one silicon atom Si.sup.1 and a unit of formula G-I bound thereto

##STR00001##

is converted to a third organosilicon compound having a unit of formula G-II

##STR00002##

by silylation of the NH group of the unit of formula G-I with a second organosilicon compound having one silicon atom Si.sup.2; and (ii) the third organosilicon compound is reacted to an isocyanate by thermolysis, whereby the unit of formula G-II is converted to an isocyanate group.

A method for the preparation of isocyanates in which: (i) a first organosilicon compound having at least one silicon atom Si.sup.1 and a unit of formula G-I bound thereto

##STR00001##

is converted to a third organosilicon compound having a unit of formula G-II

##STR00002##

by silylation of the NH group of the unit of formula G-I with a second organosilicon compound having one silicon atom Si.sup.2; and (ii) the third organosilicon compound is reacted to an isocyanate by thermolysis, whereby the unit of formula G-II is converted to an isocyanate group.