US 12,441,900 B2
Writing gel ink for pens without follower
Caffier Guillaume, Wegscheid (FR); and Liu Wing Yam, Montevrain (FR)
Assigned to SOCIÉTÉ BIC, Clichy (FR)
Appl. No. 17/904,260
Filed by SOCIÉTÉ BIC, Clichy (FR)
PCT Filed Feb. 26, 2021, PCT No. PCT/EP2021/054852
§ 371(c)(1), (2) Date Aug. 15, 2022,
PCT Pub. No. WO2021/170810, PCT Pub. Date Sep. 2, 2021.
Claims priority of application No. 20315026 (EP), filed on Feb. 28, 2020.
Prior Publication US 2023/0093346 A1, Mar. 23, 2023
Int. Cl. C09D 11/18 (2006.01); C08K 3/36 (2006.01); C09D 11/16 (2014.01)
CPC C09D 11/18 (2013.01) [C08K 3/36 (2013.01); C09D 11/16 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A writing instrument having a writing tip, the writing instrument comprising a non-aqueous writing ink which is contained in a tubular ink cartridge, wherein the tubular ink cartridge has an inner diameter of between 1 mm and 2.5 mm, a first open end, and a second open end, wherein the first open end is connected with the writing tip and the second open end is connected with external surroundings of the writing instrument,
wherein the non-aqueous writing ink contained in a tubular ink cartridge is in fluid communication with the writing tip via the first open end and with the external surroundings of the writing instrument via the second open end, and
wherein the non-aqueous writing ink comprises a solvent, a resin, a coloring agent, and a gelling agent, wherein the gelling agent comprises a mixture of silica particles and of a fatty acid amide wax, and wherein the resin is used in amounts of above 3 wt.-%, relative to a total weight of the ink.