US5009536A
Expired / Lapsed
US
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Water base pigment ink compositions for use in marking pens
Assignee: Sakura Color Products Corp
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Filing: 1990-06-08
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Granted: 1991-04-23
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Expires: 2010-06-08
Abstract
Abstract A water base pigment ink composition for use in marking pens which contain an absorbent ink reservoir and a pen tip connected thereto, the ink composition comprising: (a) water in amounts of not less than 50% by weight; (b) an aqueous emulsion of hollow resin particles in amounts of 0.5-40% by weight as solids; (c) a white pigment in amounts of 1-40% by weight; and (d) a water-solubilized α-methylstyrene/styrene/acrylic acid copolymer which has a weight average molecular weight of 1000-10,000 and a distribution of molecular weight of 0.5-3.3, but which contains substantially no components having a weight average molecular weight of not more than 500, in amounts of 0.1-30% by weight, based on the ink compositions, respectively. The ink composition may contain chromatic or achromatic (other than white) pigments in amounts of 0.1-30% by weight based on the ink composition.
Inventors
- 👤 Hiroshi Inoue
- 👤 Wataru Yokono
- 👤 Yasuji Okuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:36
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/16
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
114 words
A marking pen which contains an absorbent ink reservoir impregnated with an ink composition and a pen tip connected thereto, the ink composition comprising: (a) water in amounts of not less than 50% by weight; (b) an aqueous emulsion of hollow resin particles in amounts of 0.5-40% by weight as solids; (c) a white pigment in amounts of 1-40% by weight; and (d) a water-solubilized alpha-methylstyrene/styrene/acrylic acid copolymer which has a weight average molecular weight of 1000-10,000 and a distribution of molecular weight of 0.5-3.3, but which contains substantially no components having a weight average molecular weight of not more than 500, in amounts of 0.1-30% by weight, based on the ink compositions, respectively.
Claim 2
Dependent Claim
114 words
A marking pen which contains an absorbent ink reservoir impregnated with an ink composition and a pen tip connected thereto, the ink composition comprising: (a) water in amounts of not less than 50% by weight; (b) an aqueous emulsion of hollow resin particles in amounts of 0.5-40% by weight as solids; (c) a white pigment in amounts of 1-40% by weight; and (d) a water-solubilized alpha-methylstyrene/styrene/acrylic acid copolymer which has a weight average molecular weight of 1000-10,000 and a distribution of molecular weight of 0.5-3.3, but which contains substantially no components having a weight average molecular weight of not more than 500, in amounts of 0.1-30% by weight, based on the ink compositions, respectively.
Claim 3
Dependent Claim
18 words
A marking pen as claimed in claim 1, wherein the white pigment is titanium dioxide or zinc oxide.
Claim 4
Dependent Claim
32 words
A marking pen as claimed in claim 1, wherein the ink composition further contains chromatic or achromatic (other than white) pigments in amounts of 0.1-30% by weight base on the ink composition.
Claim 5
Dependent Claim
35 words
A marking pen as claimed in claim 1, wherein the hollow resin particles has a specific gravity of not more than one, a particle size of 0.1-1.0 mu m and a refractive index of 1.4-1.6.
Claim 6
Dependent Claim
17 words
A marking pen as claimed in claim 1, wherein the ink composition further contains water soluble resins.
Claim 7
Dependent Claim
18 words
A marking pen as claimed in claim 1, wherein the ink composition further contains water soluble organic solvents.
Claim 8
Dependent Claim
15 words
A marking pen as claimed in claim 1, wherein the ink composition further contains surfactants.
Claim 9
Dependent Claim
128 words
A marking pen which contains an absorbent ink reservoir impregnated with an ink composition and a pen tip connected thereto, the ink composition comprising: (a) water is amounts of not less than 50% by weight; (b) an aqueous emulsion of relatively low specific gravity resin particles in amounts of 0.5-40% by weight as solids; (c) a pigment of relatively high specific gravity in amounts of 1-40% by weight; and (d) a water-solubilized organic polymeric resin which has a weight average molecular weight of 1000-10,000 and a distribution of molecular weight of 0.5-3.3, but which contains substantially no components having a weight average molecular weight of not more than 500, in amounts of 0.1-30% by weight, based on the ink compositions, respectively, said ink composition having a thixotropic structure.
Claim 10
Dependent Claim
128 words
A marking pen which contains an absorbent ink reservoir impregnated with an ink composition and a pen tip connected thereto, the ink composition comprising: (a) water is amounts of not less than 50% by weight; (b) an aqueous emulsion of relatively low specific gravity resin particles in amounts of 0.5-40% by weight as solids; (c) a pigment of relatively high specific gravity in amounts of 1-40% by weight; and (d) a water-solubilized organic polymeric resin which has a weight average molecular weight of 1000-10,000 and a distribution of molecular weight of 0.5-3.3, but which contains substantially no components having a weight average molecular weight of not more than 500, in amounts of 0.1-30% by weight, based on the ink compositions, respectively, said ink composition having a thixotropic structure.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-22 | 1994-10-22 | 1995-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-22 | 1998-10-22 | 1999-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-22 | 2002-10-22 | 2003-04-23 | $7700.00 | Window Closed / Lapsed |