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US5324764A
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US
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Erasable ink composition for writing on impervious surface
Assignee: Sakura Color Products Corp
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Filing: 1993-01-19
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Granted: 1994-06-28
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Expires: 2013-01-19
Abstract
Abstract An erasable ink composition for writing on an impervious writing surface comprising an organic solvent, a resin, a pigment, and a separating agent which comprises: (a) a polyoxyethylene polyoxypropylene block copolymer, as a first separating agent, which is liquid at normal temperatures in an amount of 5-20% by weight, and (b) at least one organic compound selected from the group consisting of a carboxylic acid ester, a polyoxypropylene monoalkyl ether and a polyoxyethylene polyoxypropylene monoalkyl ether, as a second separating agent, which is liquid at normal temperatures in an amount of 2-10% by weight.
Inventors
- 👤 Hisanori Fujita
- 👤 Mikihiko Nakanishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:41
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/16
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
155 words
A liquid, erasable ink composition for writing on an impervious writing surface comprising: (a) at least one organic solvent selected from the group consisting of an aliphatic alcohol of 1 to 4 carbons and a glycol monoalkyl ether wherein the glycol has 2 to 4 carbons: (b) at least one resin selected from the group consisting of polyvinyl butyral resin, acrylic resin, styrene-acrylic copolymer resin, styrene-maleic acid copolymer resin, shellac resin and rosin-maleic acid copolymer resin; (c) a pigment; and (d) a separating agent which comprises: (i) a polyoxyethylene polyoxypropylene block copolymer, as a first separating agent, which is liquid at ambient temperatures in an amount of 5-20% by weight, and (ii) at least one organic compound selected from the group consisting of a carboxylic acid ester, a polyoxypropylene monoalkyl ether and a polyoxyethylene polyoxypropylene monoalkyl ether, as a second separating agent, which is liquid at ambient temperatures in an amount of 2-10% by weight.
Claim 2
Dependent Claim
155 words
A liquid, erasable ink composition for writing on an impervious writing surface comprising: (a) at least one organic solvent selected from the group consisting of an aliphatic alcohol of 1 to 4 carbons and a glycol monoalkyl ether wherein the glycol has 2 to 4 carbons: (b) at least one resin selected from the group consisting of polyvinyl butyral resin, acrylic resin, styrene-acrylic copolymer resin, styrene-maleic acid copolymer resin, shellac resin and rosin-maleic acid copolymer resin; (c) a pigment; and (d) a separating agent which comprises: (i) a polyoxyethylene polyoxypropylene block copolymer, as a first separating agent, which is liquid at ambient temperatures in an amount of 5-20% by weight, and (ii) at least one organic compound selected from the group consisting of a carboxylic acid ester, a polyoxypropylene monoalkyl ether and a polyoxyethylene polyoxypropylene monoalkyl ether, as a second separating agent, which is liquid at ambient temperatures in an amount of 2-10% by weight.
Claim 3
Dependent Claim
38 words
The ink composition as claimed in claim 1 wherein the carboxylic acid ester is an alkyl ester of a saturated or an unsaturated carboxylic acid wherein the carboxylic acid has 8-20 carbons and the alkyl has 2-20 carbons.
Claim 4
Dependent Claim
35 words
The ink composition as claimed in claim 1 wherein the carboxylic acid ester is an aliphatic dibasic carboxylic acid dialkyl ester or an aromatic dibasic carboxylic acid dialkyl ester wherein the alkyl has 2-20 carbons.
Claim 5
Dependent Claim
24 words
The ink composition as claimed in claim 3 wherein the aliphatic dibasic carboxylic acid dialkyl ester is a succinate, an adipate or a sebacate.
Claim 6
Dependent Claim
19 words
The ink composition as claimed in claim 3 wherein the aromatic dibasic carboxylic acid dialkyl ester is a phthalate.
Claim 7
Dependent Claim
35 words
The ink composition as claimed in claim 1 wherein the carboxylic acid ester is an ester of an aliphatic polyhydric alcohol of 4-8 carbons and a saturated or an unsaturated fatty acid of 6-24 carbons.
Claim 8
Dependent Claim
20 words
The ink composition as claimed in claim 6 wherein the polyhydric alcohol is glycerine, trimethylol propane, pentaerythritol or propylene glycol.
Claim 9
Dependent Claim
26 words
The ink composition as claimed in claim 1 which contains the first and the second separating agents in conjunction in an amount of 10-23% by weight.
Claim 10
Dependent Claim
23 words
The ink composition as claimed in claim 1 wherein the organic solvent is ethyl alcohol or isopropyl alcohol, or a mixture of these.
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) | 1997-06-27 | 1997-12-27 | 1998-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-06-27 | 2001-12-27 | 2002-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-06-27 | 2005-12-27 | 2006-06-28 | $7700.00 | Window Closed / Lapsed |