Title:
WATER-BASED INK COMPOSITION FOR BALLPOINT PEN
Document Type and Number:
WIPO Patent Application WO/2019/004084
Kind Code:
A1
Abstract:
Provided is a water-based ink composition for a ballpoint pen, the ink composition having exceptional ink discharge properties when starting writing (writing-start properties) even if the nib is exposed for an extended period of time. The water-based ink composition for a ballpoint pen is characterized by: being constituted by (a) a polyoxyalkylene alkyl ether unit represented by formula (I), (b) a maleic anhydride unit, and (c) a styrene unit; the composition ratio of these units being (a):(b):(c) = 25-75:25-75:0-50; and containing at least 0.1-5 mass% of a grafted product of an allyl alcohol/maleic anhydride/styrene copolymer having a mass average molecular weight of 1000-50,000 and a polyoxyalkylene monoalkyl alcohol, 5-40 mass% of resin particles, and water. (In formula (I), R represents a C1-5 alkyl group, and m is a positive integer from 5-50.)
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Inventors:
HIRAYAMA AKIKO (JP)
OGURA KOUSUKE (JP)
MIYOSHI KANA (JP)
OGURA KOUSUKE (JP)
MIYOSHI KANA (JP)
Application Number:
PCT/JP2018/023827
Publication Date:
January 03, 2019
Filing Date:
June 22, 2018
Export Citation:
Assignee:
MITSUBISHI PENCIL CO (JP)
International Classes:
C09D11/18; C08L29/10; C08L35/06; C08L35/08
Foreign References:
| JPH10298480A | 1998-11-10 | |||
| JP2017082154A | 2017-05-18 | |||
| JP2005290197A | 2005-10-20 | |||
| JPH03207772A | 1991-09-11 | |||
| JPH0413783A | 1992-01-17 | |||
| JP2007238736A | 2007-09-20 | |||
| JP2012046637A | 2012-03-08 | |||
| JP2011178973A | 2011-09-15 | |||
| JP2016132749A | 2016-07-25 |
Other References:
See also references of EP 3647379A4
Attorney, Agent or Firm:
FUJIMOTO Eisuke et al. (JP)
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