公开(公告)号：EP1802714A1

公开(公告)日：2007-07-04

申请号：EP04792892.4

申请日：2004-10-18

申请人： Canon Finetech Inc.

发明人： INOUE, Hitoshi, c/o CANON FINETECH INC. ,  YAMAMOTO, Tomoya, c/o CANON FINETECH INC. ,  TACHIBANA, Yukiko, c/o CANON FINETECH INC. ,  OOKAWA, Takayuki, c/o CANON FINETECH INC. ,  MORIOKA, Junko, c/o CANON FINETECH INC.

IPC分类号： C09D11/00

CPC分类号： C09D11/326 ,  C09D11/30

摘要： A water-based ink for inkjet printers contains at least a water-insoluble colorant, a block copolymer of a polyvinyl ether structure comprising at least one kind of hydrophilic segments and at least one kind of hydrophobic segments, water and an alkali. Each of the hydrophilic segments contains acidic groups. A content of the alkali is such that, when an infrared absorption intensity ascribable to ionic groups to be formed upon addition of an excess amount of the alkali to the block copolymer is supposed to be 100%, an infrared absorption intensity ascribable to ionic groups formed by dissociation of the acidic groups contained in the block copolymer becomes at least 80%, with a proviso that the content does not exceed twice as much as a smallest amount of the alkali that an infrared absorption intensity ascribable to ionic groups to be formed from the block copolymer becomes 100%.