公开(公告)号：US10550278B2

公开(公告)日：2020-02-04

申请号：US15752708

申请日：2016-08-12

Applicant: KAO CORPORATION

Inventor： Tomoaki Il ,  Masayuki Narita ,  Kazuki Watanabe

IPC: C09D11/00 ,  C09D11/322 ,  C09D11/38

Abstract: The present invention relates to [1] a water-based ink for ink-jet printing containing titanium oxide (A) and a pigment dispersant (B), in which the pigment dispersant (B) contains a constitutional unit derived from an anionic group-containing monomer (a) and a constitutional unit derived from a polyalkylene glycol (meth)acrylate (b); an average molar number of addition of an alkyleneoxide in the polyalkylene glycol (meth)acrylate (b) is from 15 to 100; an acid value of the pigment dispersant (B) is from 100 to 400 mgKOH/g; and a content of the pigment dispersant (B) in the water-based ink is from 0.3 to 18 parts by mass on the basis of 100 parts by mass of the titanium oxide (A), and [2] an ink-jet printing method of ejecting the water-based ink described in the above item [1] onto a printing medium using an ink-jet printing apparatus to print characters or images on the printing medium. According to the present invention, there are provided a water-based ink for ink-jet printing which contains titanium oxide as a pigment, and is excellent in redispersibility, and an ink-jet printing method.

公开(公告)号：US11142661B2

公开(公告)日：2021-10-12

申请号：US16626215

申请日：2018-06-15

Applicant: KAO CORPORATION

Inventor： Tomoaki Il ,  Isao Tsuru ,  Norihiro Yoshida ,  Yoshiharu Niizeki ,  Jun Tairadate ,  Kimiya Yamada ,  Hideki Sakai

IPC: C09D11/322 ,  B41J11/00 ,  C09D11/326 ,  C09D11/40

Abstract: The present invention relates to an ink-jet printing method using an apparatus including a printing means for ejecting a black ink to a printing substrate to print characters or images on the printing substrate, and a drying means disposed on a downstream side of a transportation direction of the printing substrate, in which the printing substrate is a label printing substrate; the black ink is a water-based composite black ink; the water-based composite black ink contains a composite black pigment containing carbon black, and a content of the carbon black in the composite black pigment is not more than 25% by mass; and the drying means is an infrared heater for heating the water-based composite black ink ejected onto the printing substrate to a temperature of not lower than 95° C. and not higher than 125° C. According to the ink-jet printing method of the present invention, it is possible to obtain a good printed material that is free of color migration or deformation of a printing substrate even when printed on a label printing substrate.

公开(公告)号：US11505709B2

公开(公告)日：2022-11-22

申请号：US16957189

申请日：2018-12-25

Applicant: KAO CORPORATION

Inventor： Daiki Kawata ,  Masashi Inoue ,  Tomoaki Il

IPC: C09D11/107 ,  B41M5/00 ,  C09D11/033 ,  C09D11/322 ,  B41J2/01 ,  B41J2/21

Abstract: The present invention relates to [1] a water-based ink containing water-insoluble polymer particles (A), an organic solvent (B) and water, in which a polymer constituting the water-insoluble polymer particles (A) is in the form of a crosslinked polymer; the organic solvent (B) contains a polyhydric alcohol ether; and a rate of change in viscosity of the organic solvent (B) as calculated according to the formula (1) is not more than 140%, and [2] a printing method of printing characters or images on a printing medium using the water-based ink described in the above [1], in which a water absorption of the printing medium per a unit surface area thereof as measured by contacting the printing medium with pure water for 100 milliseconds is not less than 0 g/m2 and not more than 10 g/m2.