Claims
- 1. A graffiti remover which comprises:
- (a) from about 20 to about 60 wt. % of a dye solvent selected from the group consisting of pyrrolidones and lactones;
- (b) from about 40 to about 80 wt. % of a dye non-solvent selected from the group consisting of glycol ether esters and glycol diethers; and
- (c) from about 0.1 to about 10 wt. % of a dye bleaching agent selected from the group consisting of main group metal hydrides, transition metal hydrides, and alkali metal hydrosulfites.
- 2. The graffiti remover of claim 1 further comprising up to about 10 wt. % of a thickener.
- 3. The graffiti remover of claim I further comprising up to about 10 wt. % a surfactant.
- 4. The graffiti remover of claim 1 wherein the dye solvent is selected from the group consisting of N-methyl-2-pyrrolidone, .gamma.-butyrolactone, and mixtures thereof.
- 5. The graffiti remover of claim 1 wherein the dye non-solvent is dipropylene glycol methyl ether acetate.
- 6. The graffiti remover of claim 1 wherein the dye bleaching agent is an alkali metal borohydride.
- 7. The graffiti remover of claim I comprising from about 30 to about 50 wt. % of the dye solvent, from about 50 to about 70 wt. % of the dye non-solvent, and from about 0.5 to about 5 wt. % of the dye bleaching agent.
- 8. A graffiti remover which comprises:
- (a) from about 20 to about 60 wt. % of a dye solvent selected from the group consisting of N-methyl-2-pyrrolidone, .gamma.-butyrolactone, and mixtures thereof;
- (b) from about 40 to about 80 wt. % of a dye non-solvent selected from the group consisting of glycol ether acetates and C.sub.1 -C.sub.4 diethers of C.sub.2 -C.sub.6 glycols; and
- (c) from about 0.1 to about 10 wt. % of a dye bleaching agent selected from the group consisting of main group metal hydrides, transition metal hydrides, and alkali metal hydrosulfites.
- 9. The graffiti remover of claim 1 further comprising up to about 10 wt. % of a thickener.
- 10. The graffiti remover of claim 8 further comprising up to about 10 wt. % a surfactant.
- 11. The graffiti remover of claim 8 wherein the dye bleaching agent is an alkali metal borohydride.
- 12. A method which comprises applying to a graffiti-marked surface the graffiti remover of claim 1 in an amount effective to allow subsequent removal of the graffiti from the surface.
- 13. A method which comprises removing permanent ink graffiti from a painted surface without substantially altering the surface and without leaving behind a graffiti ghost by treating the surface with a graffiti remover which comprises:
- (a) from about 20 to about 60 wt. % of a dye solvent selected from the group consisting of pyrrolidones and lactones;
- (b) from about 40 to about 80 wt. % of a dye non-solvent selected from the group consisting of glycol ether esters and glycol diethers; and
- (c) from about 0.1 to about 10 wt. % of a dye bleaching agent selected from the group consisting of
- (1) a reducing agent selected from the group consisting of main group metal hydrides, transition metal hydrides, and alkali metal hydrosulfites; and
- (2) an oxidizing agent selected from the group consisting of hypochlorites, persulfates, perbenzoates, inorganic peroxyacids, percarbonates, and peracids.
- 14. The method of claim 13 wherein the graffiti remover comprises from about 30 to about 50 wt. % of the dye solvent, from about 50 to about 70 wt. % of the dye non-solvent, and from about 0.5 to about 5 wt. % of the dye bleaching agent.
- 15. The method of claim 13 wherein the dye solvent is N-methyl-2-pyrrolidone, the dye non-solvent is dipropylene glycol methyl ether acetate, and the bleaching agent is sodium borohydride.
- 16. The method of claim 13 wherein the graffiti and graffiti remover are rinsed from the treated surface with water.
Parent Case Info
This is a continuation of application Ser. No. 08/345,098, filed Nov. 28, 1994, now abandoned.
US Referenced Citations (20)
Foreign Referenced Citations (2)
Number |
Date |
Country |
2191501A |
Dec 1987 |
GBX |
WO8808445 |
Nov 1988 |
WOX |
Continuations (1)
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Number |
Date |
Country |
Parent |
345098 |
Nov 1994 |
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