The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 07, 1988
Filed:
Apr. 14, 1986
Henry J Nelson, Grosse Pointe Woods, MI (US);
Grow Group, Inc., Troy, MI (US);
Abstract
A paint stripper composition comprising a mixture of N-methyl-2-pyrrolidone and an aromatic, high flash hydrocarbon solvent applied to a painted surface for stripping paint. Accelerators useful in the mixture are an organic acid such as formic acid or an amine such as monoethanolamine. The paint stripper composition may also include an oil soluble surfactant to aid in wetting the surface of the object to be stripped. Also, a water soluble surfactant may be added to facilitate water rinsing the composition and loosened paint from the surface. The paint stripper may be thickened by addition of ethylcellulose to form a paint stripping composition having a thickness appropriate for immersion, spray, brush or knife application. The composition of the paint stripper may comprise from 20-90% by weight of N-methylpyrrolidone, 30-70% by weight 140.degree. F. flash aromatic hydrocarbon solvent, 2-15% by weight formic acid, 0-3% by weight corrosion inhibitor, 0-5% by weight oil soluble nonionic surfactant and 2-6% by weight of water soluble nonionic surfactant and from 0-6% by weight of ethylcellulose. Instead of the acid and corrosion inhibitor, an amine may be added as an accelerator in the amount of 1 to 5% by weight. The preferred method of making the paint stripper composition includes vigorously mixing the aromatic solvent as the ethylcellulose is sifted slowly into the solvent. Then, N-methyl-2-pyrrolidone, the surfactants, and amine are added or, alternatively, the acid is added prior to adding the surfactants instead of the amine.