Patent EP0385588A2 successfully refreshed from Google Patents.
Patent US2430038A successfully refreshed from Google Patents.
US4460727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water base pigment ink composition for writing
Assignee: Dainichiseika Color and Chemicals Mfg Co Ltd
•
Filing: 1982-10-21
•
Granted: 1984-07-17
•
Expires: 2002-10-21
Abstract
Abstract A water base pigment ink composition for writing comprises a pigment, a dispersing agent, an anti-drying agent and an aqueous medium, in which said dispersing agent is a water soluble amine salt or ammonium salt of a copolymer comprises at least 50 molar % of a hydrophobic addition-polymerizable monomer and less than 50 molar % of acrylic acid or methacrylic acid, and said anti-drying agent is urea, thiourea or a derivative thereof.
Inventors
- 👤 Yukito Shoji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:45
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/16; Y; Y10; Y10S; Y10S260/00; Y10S260/38
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
172 words
A water based pigment ink composition for writing, comprising: (1) from 3 to about 30% by weight of a pigment, based on the total ink composition; (2) from 5 to 300 parts by weight of a dispersing agent, based on 100 parts by weight of pigment in the ink composition, which is a copolymer of from 5 to less than 50 mol % of a water-soluble amine salt or ammonium salt of acrylic acid or methacrylic acid with the remaining monomer being at least one ester of acrylic or methacrylic acid, styrene or styrene derivative; (3) from 0.5 to 50% by weight of urea, thiourea or derivative thereof as an anti-drying agent, based on the total ink composition; and (4) from 15 to 75% by weight of an aqueous medium, based on the total amount of ink composition, containing from 2 to 50 parts by weight of ethylene glycol, glycerine, diethylene glycol, propylene glycol and/or dipropylene glycol per 100 parts by weight of water, as a high boiling point water-soluble organic solvent.
Claim 2
Dependent Claim
172 words
A water based pigment ink composition for writing, comprising: (1) from 3 to about 30% by weight of a pigment, based on the total ink composition; (2) from 5 to 300 parts by weight of a dispersing agent, based on 100 parts by weight of pigment in the ink composition, which is a copolymer of from 5 to less than 50 mol % of a water-soluble amine salt or ammonium salt of acrylic acid or methacrylic acid with the remaining monomer being at least one ester of acrylic or methacrylic acid, styrene or styrene derivative; (3) from 0.5 to 50% by weight of urea, thiourea or derivative thereof as an anti-drying agent, based on the total ink composition; and (4) from 15 to 75% by weight of an aqueous medium, based on the total amount of ink composition, containing from 2 to 50 parts by weight of ethylene glycol, glycerine, diethylene glycol, propylene glycol and/or dipropylene glycol per 100 parts by weight of water, as a high boiling point water-soluble organic solvent.
Claim 3
Dependent Claim
30 words
The ink composition according to claim 1 which contains from about 10 to about 100 parts by weight of the dispersing agent per 100 parts by weight of the pigment.
Claim 4
Dependent Claim
22 words
The ink composition according to claim 1 which contains from about 2.5 to 40% by weight of the anti-drying agent (3) .
Claim 5
Dependent Claim
19 words
The ink composition according to claim 1 which contains from 40 to 60% by weight of the aqueous medium.
Claim 6
Dependent Claim
36 words
The ink composition according to claim 1 wherein the copolymer comprises from 60 to 95 molar % of the hydrophobic addition polymerizable monomer and from 5 to 40 molar % of acrylic acid or methacrylic acid.
References Cited (Backward Citations)
US4101480A
Cited
JPS5628256A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-17 | 1988-01-16 | 1988-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-17 | 1992-01-16 | 1992-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-17 | 1996-01-16 | 1996-07-17 | $7700.00 | Window Closed / Lapsed |