Claims
- 1. An erasable writing ink suitable for use in a ball point pen comprising at least 10% by weight of an elastomer selected from the group consisting of polyvinyl acetate, a copolymer of ethylene and vinyl acetate, and mixtures thereof, from about 10% to about 40% by weight of trichloroethylene, and an effective amount of a colorant.
- 2. The ink of claim 1 which contains from about 10% to about 25% by weight of elastomer.
- 3. The ink of claim 1 also comprising at least 5%w of a solvent having a boiling point of at least about 180.degree. C.
- 4. The ink of claims 1 or 3 also comprising at least about 5%w of a second solvent having a boiling point of at least about 270.degree. C.
- 5. The ink of claim 3 wherein the solvent is benzyl alcohol or dipropylene glycol.
- 6. The ink of claim 4 wherein the second solvent is a polyester plasticizer or toluene sulfonamide.
- 7. The ink of claim 1 also comprising from 0-25%w of a white mineral oil having an initial boiling point of at least 270.degree. C.
- 8. The ink of claim 1 comprising from about 10% to about 25%w elastomer, about 10% to about 40%w trichloroethylene, about 5% to about 32%w of a solvent boiling in the range of about 180.degree.-250.degree. C., about 0% to about 25%w of a solvent having a boiling point of at least 270.degree. C., and at least about 10%w of a colorant.
- 9. The ink of claim 8 also comprising at least about 3%w of a tackifying agent.
Parent Case Info
This is a continuation of application Ser. No. 06/320,443, filed Nov. 12, 1981 now U.S. Pat. No. 4,367,966.
US Referenced Citations (5)
Continuations (1)
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Number |
Date |
Country |
Parent |
320443 |
Nov 1981 |
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