Ink for plate pen

• US 6,508,870 B1
• Filed: 08/21/2000
• Issued: 01/21/2003
• Est. Priority Date: 08/25/1999
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Pilot Corporation
• Original Assignee: Kabushiki Kaisha Pilot Corporation
• Inventors: Kiyomoto, Hiroshi, Komatsuzawa, Tadashi
• Primary Examiner(s): Klemanski, Helene
• Assistant Examiner(s): Faison, Veronica F.
• Application Number:
  US09/642,102
• Time in Patent Office: 883 Days
• Field of Search: 106/31.58, 106/31.86, 106/31.27, 106/31.6
• US Class Current: 106/31.27
• CPC Class Codes: C09D 11/16 Writing inks

Abstract

The ink allows to prevent spout of the ink from the nib, and has a good penetrating and drying ability of writing to a material to be written. And the ink comprises a penetrant and a coloring agent, a humectant and water, wherein viscosity at 20° C. is from 1.2 to 10 mPa·s and surface tension is from 35 to 55 dyne/cm. The penetrant can be glycol ether represented by the following formula

R₁—(O—R₂)_x—O—R₃

wherein, R₁ is an alkyl group having 2 to 4 carbon atoms or a phenyl group, R₂ is “—CH₂—CH₂—” or “—CH₂CH(CH₃)—”, R₃ is H or an alkyl group having 1 to 6 carbon atoms, and X is an integer of 2 or 3.

Claims

1. An ink for a plate pen comprising a penetrant at a blending amount from 0.5 to 3.0% by weight, and a coloring agent, a humectant and water, wherein viscosity at 20°

C. is from 1.2 to 10 mPa·

S and surface tension is from 35 to 55 dyne/cm.

2. The ink for a plate pen according to claim 1, wherein the penetrant is composed of a glycol ether represented by the following formula (I):

3. The ink for a plate pen according to claim 1, wherein the penetrant is 3-methyl-3-methoxybutanol.

4. The ink for a plate pen according to claim 1, wherein the penetrant is a glycol ether having a vapor pressure of 0.01 to 0.5 mmHg, a boiling point of 150 to 280°

C., a surface tension of 25 to 35 dyne/cm, and a viscosity of 1.2 to 10 mPa·

s at 20°

C. and 760 mmHg.

5. The ink for a plate pen according claim 1, wherein the coloring agent is present in the ink in an amount of 5 to 15% by weight.

6. The ink for a plate pen according to claim 1, wherein a pH of the ink is from 8 to 11.

7. A plate pen having an ink therein, said ink comprising a penetrant and a coloring agent, a humectant and water, wherein viscosity at 20°

C. is from 1.2 to 10 mPa·

S and surface tension is from 35 to 55 dyne/cm.

10. The plate pen according to claim 7, wherein the penetrant in said ink is a glycol ether having a vapor pressure of 0.01 to 0.5 mmHg, a boiling point of 150 to 280°

C., a surface tension of 25 to 35 dyne/cm, and a viscosity of 1.2 to 10 mPa·

S at 20°

C. and 760 mmHg.

11. The plate pen according to claim 7, wherein the coloring agent is present in said ink in an amount of 5 to 15% by weight.

12. The plate pen according to claim 7, wherein a blending amount of the penetrant in said ink is from 0.5 to 3.0% by weight.

13. The plate pen according to claim 7, wherein a pH of said ink is from 8 to 11.

8. The plate pen according to claimed 7, wherein the penetrant in said ink is composed of a glycol ether represented by the following formula (I):

9. The plate pen according to claim 8, wherein the penetrant in said ink is 3-methyl-3-methoxybutanol.