US 5,882,390 AGranted

Recording ink composition and recording method using the same

AssigneeRicoh Company, Ltd.

InventorsKiyofumi Nagai, Akio Kojima, Masato Igarashi, Akiko Konishi, Hiroyuki Mochizuki, Takanori Tsuyuki, Masayuki Koyano, Ikuko Tanaka

Life of this patent

Estimating the term…

patentgrep

Loading patent…

Abstract

A recording ink composition contains a colorant which is soluble or dispersible in water and includes at least one phthalocyanine compound of formula (1) which may have a halogen atom as a substituent and at least one of phthalocyanine compounds of formulas (2) and (3); a dispersant which includes at least one polymeric compound having a hydrophilic moiety and a hydrophobic moiety, and/or at least one surfactant having an alkyl group having 5 or more carbon atoms; water; and a humectant. In addition, images with a resolution of 10 dots/mm.times.10 dots/mm or more can be recorded on an image receiving medium by ejecting the above-mentioned recording ink composition in the form of droplets by the application of thermal or mechanical energy thereto onto an image receiving medium with a Stockigt size degree of 3 seconds or more, with the recording ink composition being deposited in an amount of 20 pl/mm.sup.2 to 200 pl/mm.sup.2 on the image receiving medium.

Claims12

Dependent claims

A recording ink composition comprising:

a colorant which is soluble or dispersible in water and comprises at least one phthalocyanine compound represented by formula (1), ##STR18## wherein M is a hydrogen atom, Cu, Fe, Co or Ni, X is a halogen atom, and p is an integer of 0 to 8;
and at least one phthalocyanine compound selected from the group consisting of compounds represented by formulas (2) and (3), ##STR19## wherein M is a hydrogen atom, Cu, Fe, Co or Ni;
A is a phenylene group or a straight-chain or branched alkylene group having 1 or more carbon atoms, M.sup.+ is a cation selected from the group consisting of alkali metal cation, quaternary ammonium cation, quaternary phosphonium cation, and alkanolamine cation, and q is an integer of 0 to 4, and r is an integer of 0 to 8, provided that q and r cannot be 0 (zero) at the same time;
and ##STR20## wherein M is a hydrogen atom, Cu, Fe, Co or Ni, A is a phenylene group or a straight-chain or branched alkylene group having 1 or more carbon atoms, M.sup.+ is a cation selected from the group consisting of alkali metal cation, quaternary ammonium cation, quaternary phosphonium cation, and alkanolamine cation, and s is an integer of 0 to 4, and t is an integer of 0 to 4, provided that s and t cannot be 0 (zero) at the same time;
a dispersant comprising at least one dispersant component selected from the group consisting of at least one polymeric compound having a hydrophilic moiety and a hydrophobic moiety, and at least one surfactant having an alkyl group having 5 or more carbon atoms;
water;
and
a humectant.

5 more elements

A method of recording images on an image receiving medium, comprising the step of ejecting a recording ink composition in the form of droplets by the application of thermal or mechanical energy thereto onto an image receiving medium with a Stockigt size degree of 3 seconds or more, with said recording ink composition being deposited in an amount of 20 pl/mm.sup.2 to 200 pl/mm.sup.2 on said image receiving medium, thereby forming images with a resolution of 10 dots/mm.times.10 dots/mm or more, said recording ink composition comprising:

a colorant which is soluble or dispersible in water and comprises at least one phthalocyanine compound represented by formula (1), ##STR30## wherein M is a hydrogen atom, Cu, Fe, Co or Ni, X is a halogen atom, and p is an integer of 0 to 8;
and at least one phthalocyanine compound selected from the group consisting of compounds represented by formulas (2) and (3), ##STR31## wherein M is a hydrogen atom, Cu, Fe, Co or Ni;
A is a phenylene group or a straight-chain or branched alkylene group having 1 or more carbon atoms, M.sup.+ is a cation selected from the group consisting of alkali metal cation, quaternary ammonium cation, quaternary phosphonium cation, and alkanolamine cation, and q is an integer of 0 to 4, and r is an integer of 0 to 8, provided that q and r cannot be 0 (zero) at the same time;
and ##STR32## wherein M is a hydrogen atom, Cu, Fe, Co or Ni, A is a phenylene group or a straight-chain or branched alkylene group having 1 or more carbon atoms, M.sup.+ is a cation selected from the group consisting of alkali metal cation, quaternary ammonium cation, quaternary phosphonium cation, and alkanolamine cation, and s is an integer of 0 to 4, and t is an integer of 0 to 4, provided that s and t cannot be 0 (zero) at the same time;
a dispersant comprising at least one dispersant component selected from the group consisting of at least one polymeric compound having a hydrophilic moiety and a hydrophobic moiety, and at least one surfactant having an alkyl group having 5 or more carbon atoms;
water;
and
a humectant.

5 more elements

Dependencies are inferred from the claim text.