C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
149/28
C09D 9/00 (2006.01)
Patent
CA 1322321
ABSTRACT OF THE DISCLOSURE A paint stripper composition comprising of N-methyl-2- pyrrolidone and an aromatic, high flash hydrocarbon solvent applied to a paintedsurface for stripping paint. Accelerators useful in the mixture an organic acidsuch as formic acid or an amine such as monoethanolamine. The paint stripper composition may also include an oil 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° F. flash aromatichydrocarbon 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 ethycellulose. 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.
547919
Grow Group Inc.
Macrae & Co.
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