Claims
- 1. 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.
- 2. A marking pen as claimed in claim 1, wherein the white pigment is titanium dioxide or zinc oxide.
- 3. 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.
- 4. 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.
- 5. A marking pen as claimed in claim 1, wherein the ink composition further contains water soluble resins.
- 6. A marking pen as claimed in claim 1, wherein the ink composition further contains water soluble organic solvents.
- 7. A marking pen as claimed in claim 1, wherein the ink composition further contains surfactants.
- 8. 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.
Priority Claims (1)
Number |
Date |
Country |
Kind |
63-288237 |
Nov 1988 |
JPX |
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REFERENCE TO RELATED APPLICATION
The present application is a division of a patent application Ser. No. 07/434,945, filed Nov. 9, 1989 U.S. Pat. No. 4,942,185.
US Referenced Citations (5)
Divisions (1)
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Number |
Date |
Country |
Parent |
434945 |
Nov 1989 |
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