Paint removing composition
AssigneeWilliam L. Brown
InventorMartin J. Plishka
Life of this patent
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Abstract
A composition for removing paint, particularly graffiti, is described which contains an alkylene carbonate, which may be propylene carbonate, butylene carbonate or mixtures thereof; propylene glycol as a hydrotrope, and a polypropylene glycol having a molecular weight of at least 200. In one embodiment, the composition also contains a hydroxyalkylcellulose thickener, for example, at least 0.5 volume percent hydroxymethylcellulose may be present. In another embodiment, the composition contains no N-methylpyrrolidone, amine, DMSO, isocetyl alcohol or surfactant, unlike some prior graffiti-removing compositions.
Claims3
A surfactant-free composition for removing paint consisting essentially of:
- from about 15 to about 90 volume percent of an alkylene carbonate selected from the group consisting of propylene carbonate, butylene carbonate and mixtures thereof;
- from about 3 to about 50 volume percent of propylene glycol;
- and
- from about 2 to about 30 volume percent of a polypropylene glycol having a molecular weight of at least 200
- wherein the total amount of said alkylene carbonate, propylene glycol, and polypropylene glycol in said composition is essentially 100% by volume.
A surfactant-free composition for removing paint consisting essentially of:
- from about 20 to about 80 volume percent of propylene carbonate;
- from about 5 to about 45 volume percent of propylene glycol;
- from about 2 to about 30 volume percent of a polypropylene glycol having a molecular weight of at least 200;
- and
- at least 0.1 volume percent of a hydroxyalkylcellulose thickener, where the hydroxyalkylcellulose thickener is selected from the group consisting of hydroxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hydroxybutylcellulose, and mixtures thereof
- wherein the total amount of said alkylene carbonate, propylene glycol, polypropylene glycol, and hydroxyalkycellulose thickener in said composition is essentially 100% by volume.
Dependencies are inferred from the claim text.