Claims
- 1. A NEON board comprising a transparent panel of polymethyl methacrylate which has impervious surfaces and a water base ink composition forming erasable and light-scattering writings on said surfaces, said ink composition comprising:
- (a) water in an amount of not less than 50% by weight;
- (b) hollow resin particles providing a light scattering agent and a colorant in the form of an aqueous emulsion which have a particle size of 0.1-1.0 microns and a refractive index of 1.4-1.6 dispersed in the water in an amount of 0.5-50% by weight;
- (c) a resin which is water soluble and film-forming at room temperatures in an amount of 0.5-30% by weight; and
- (d) an aqueous emulsion of a nonvolatile aliphatic carboxylic acid ester in a dry amount of 0.5-25% by weight.
- 2. The NEON board as claimed in claim 1 wherein the water soluble resin is polyvinyl alcohol.
- 3. The NEON board as claimed in claim 1 wherein the ink composition further contains a water soluble polyhydric alcohol in an amount of not more than 20% by weight based on the ink composition.
- 4. The NEON board as claimed in claim 1 wherein the ink composition further contains a lower aliphatic alcohol in an amount of not more than 15% by weight based on the ink composition.
- 5. The NEON board as claimed in claim 1 wherein the aliphatic carboxylic acid ester is a monobasic carboxylic acid ester, a dibasic carboxylic acid diester, a mono- or diester of a dihydric alcohol, or a mono-, di- or triester of a trihydric alcohol.
- 6. The NEON board as claimed in claim 1 wherein the ink composition further contains surfactants.
- 7. The NEON board as claimed in claim 1 wherein the ink composition further includes a chromatic pigment or a dye as an additional colorant in an amount of not more than 20% by weight.
- 8. A method for preparing a neon board having a transparent panel of polymethyl methacrylate resin which has impervious surfaces with erasable and light-scattering writings thereon, which comprises forming the writings on the impervious surface with a marking pen which contains an absorbent ink reservoir therein impregnated with an ink composition and a pen tip connected thereto, the ink composition comprising:
- (a) water in an amount of no less than 50% by weight;
- (b) hollow resin particles as a light scattering agent and a colorant in the form of aqueous emulsion which have a particle size of 0.1-1.0 microns and a refractive index of 1.4-1.6 dispersed in the water in an amount of 0.5-50% by weight;
- (c) a resin which is by nature water insoluble and film-forming at room temperatures, but is either made water soluble by salt formation with bases, or is in the form of aqueous emulsions or hydrosols in an amount of 0.5-30% by weight; wherein the resin is selected from the group consisting of polyvinyl acetate and vinyl acetate copolymers; and
- (d) an aqueous emulsion of a nonvolatile aliphatic carboxylic acid ester in a dry amount of 0.5-25% by weight.
- 9. The method as claimed in claim 8 wherein the ink composition further contains a water soluble polyhydric alcohol in an amount of not more than 20% by weight based on the ink composition.
- 10. The method as claimed in claim 8 wherein the ink composition further contains a lower aliphatic alcohol in an amount for not more that 15% by weight based on the ink composition.
- 11. The method as claimed in claim 8 wherein the aliphatic carboxylic acid ester is monobasic carboxylic acid ester, a dibasic carboxylic acid diester, a mono or diester of dihydric alcohol, or a mono-, di- or triester of a trihydric alcohol.
- 12. The method as claimed in claim 8 wherein the ink composition further contains surfactants.
- 13. The method as claimed in claim 8 wherein the ink composition further contains a chromatic pigment or a dye as an additional colorant in an amount of not more than 20% by weight.
Parent Case Info
This is a divisional of application Ser. No. 08/106,526, filed Aug. 16, 1993, which is a continuation of Ser. No. 07/822,603, filed Jan. 17, 1992, now abandoned, which was a continuation of Ser. No. 07/434,958 filed Nov. 9, 1989, now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4954174 |
Imagawa |
Sep 1990 |
|
5004763 |
Imagawa |
Apr 1991 |
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Divisions (1)
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Number |
Date |
Country |
Parent |
106526 |
Aug 1993 |
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Continuations (2)
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Number |
Date |
Country |
Parent |
822603 |
Jan 1992 |
|
Parent |
434958 |
Nov 1989 |
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