Invention Grant
- Patent Title: Method for printing and printer
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Application No.: US16888133Application Date: 2020-05-29
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Publication No.: US11235609B2Publication Date: 2022-02-01
- Inventor: Hiroshi Gotou
- Applicant: RICOH COMPANY, LTD.
- Applicant Address: JP Tokyo
- Assignee: RICOH COMPANY, LTD.
- Current Assignee: RICOH COMPANY, LTD.
- Current Assignee Address: JP Tokyo
- Agency: Grüneberg and Myers PLLC
- Priority: JPJP2019-108942 20190611
- Main IPC: B41M5/00
- IPC: B41M5/00 ; C09D11/54 ; B41J2/21

Abstract:
A method for printing is provided including: applying a pretreatment liquid containing a compound that aggregates an anionic compound on a print medium, and applying an ink containing water, an organic solvent, and a resin particle on the print medium to which the pretreatment liquid has been applied. The resin particle includes a polyurethane resin particle. The ink contains a cyclic ester having a structure represented by the following general formula (I). After the ink is left to stand and stored under a room temperature environment (25±5° C.) for a month, a rate of content of crystals of the cyclic ester having a particle diameter of 1 μm or larger in the ink is lower than 4 ppm.
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