Ink composition including a modified polymer or copolymer additive
US-2018010003-A1 · Jan 11, 2018 · US
Aqueous ink composition for ballpoint pen
US11634601B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11634601-B2 |
| Application number | US-201816627568-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 22, 2018 |
| Priority date | Jun 30, 2017 |
| Publication date | Apr 25, 2023 |
| Grant date | Apr 25, 2023 |
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Abstract
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To provide an aqueous ink composition for ballpoint pen having excellent ink discharge properties at the initial writing (initial touch) even after exposure of the pen tip for a long period of time. The aqueous ink composition for ballpoint pen contains at least 0.1 to 5% by mass of a graft compound of an allyl alcohol-maleic anhydride-styrene copolymer composed of: (a) a polyoxyalkylene alkyl ether unit represented by Formula (I), (b) a maleic anhydride unit, and (c) a styrene unit, the allyl alcohol-maleic anhydride-styrene copolymer having the composition ratio (a):(b):(c) of 25 to 75:25 to 75:0 to 50% by mol and having a mass average molecular weight from 1000 to 50000, and polyoxyalkylene monoalkyl alcohol; 5 to 40% by mass of resin particles; and water; wherein in Formula (I), R represents an alkyl group having 1 to 5 carbons, and m is a positive number of 5 to 50.
First claim
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The invention claimed is: 1. An aqueous ink composition for a ballpoint pen, wherein the aqueous ink composition comprises at least: 0.1 to 5% by mass of a graft compound of an allyl alcohol-maleic anhydride-styrene copolymer and polyoxyalkylene monoalkyl alcohol, composed of (a) a polyoxyalkylene alkyl ether unit represented by Formula (I), (b) a maleic anhydride unit, and (c) a styrene unit, the allyl alcohol-maleic anhydride-styrene copolymer having the composition ratio (a):(b):(c) of 25 to 75:25 to 75:0 to 50% by mol and having a mass average molecular weight from 1000 to 50000; 5 to 40% by mass of resin particles; and water; wherein in Formula (I), E represents an alkyl group having 1 to 5 carbons, and m is a positive number of 5 to 50, and wherein the resin particles comprise colored resin particles. 2. The aqueous ink composition according to claim 1 , wherein the graft compound is at least one represented by Formula (II) wherein m=11 to 28, n=18 to 20, and it has a mass average molecular weight of 15000 to 40000. 3. The aqueous ink composition according to claim 1 , wherein the graft compound is at least one represented by Formula (III) wherein m=11, n=14, and it has a mass average molecular weight of 10000. 4. The aqueous ink composition according to claim 1 , wherein the ink composition further includes a water-soluble organic solvent. 5. The aqueous ink composition according to claim 1 , wherein the graft compound is at least one represented by Formula (II) wherein m=11 to 28, n=18 to 20, and it has a mass average molecular weight of 15000 to 40000. 6. The aqueous ink composition according to claim 1 , wherein the graft compound is at least one represented by Formula (III) wherein m=11, n=14, and it has a mass average molecular weight of 10000. 7. The aqueous ink composition according to claim 1 , wherein the ink composition further includes a water-soluble organic solvent.
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- What does patent US11634601B2 cover?
- To provide an aqueous ink composition for ballpoint pen having excellent ink discharge properties at the initial writing (initial touch) even after exposure of the pen tip for a long period of time. The aqueous ink composition for ballpoint pen contains at least 0.1 to 5% by mass of a graft compound of an allyl alcohol-maleic anhydride-styrene copolymer composed of: (a) a polyoxyalkylene alkyl …
- Who is the assignee on this patent?
- Mitsubishi Pencil Co
- What technology area does this patent fall under?
- Primary CPC classification C09D11/18. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Apr 25 2023 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).