Compositions – Compositions containing a single chemical reactant or plural... – Organic reactant
Patent
1986-04-14
1988-06-07
Wax, Robert
Compositions
Compositions containing a single chemical reactant or plural...
Organic reactant
134 38, 252105, 252143, 252146, 252151, 252158, 252542, 252548, 252DIG8, C11D 752
Patent
active
047495103
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.
REFERENCES:
patent: 2507985 (1950-05-01), Kuentzel
patent: 2630409 (1953-03-01), Bruner et al.
patent: 4120810 (1978-10-01), Palmer
patent: 4276186 (1981-06-01), Bakos et al.
Grow Group Inc.
Wax Robert
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