Patent ID: 6599998
Filing Date: 2003-07-29
Classification: C08F,G03C

Abstract:
A method of producing a photographic copolymer coupler composed of at least three monomers having different reactivity as constitutional components: a monomer component A, a monomer component B and a monomer components C, comprising carrying out a polymerization while adding, dropwise,a solution of the monomer component B having higher reactivity than the monomer component A, dissolved in a non-aqueous solvent having a boiling point of 55Â° C. to 120Â° C. and a solution of monomer component C, to a solution of the monomer component A dissolved in a non-aqueous solvent having a boiling point of 55Â° C. to 120Â° C., in the presence of a polymerization initiator, wherein the said monomer components A and C are non-color-forming components and said monomer component B is a coupler component.