Cleaning and liquid contact with solids – Processes – Paints – varnishes – lacquers – or enamels – removal
Patent
1988-06-03
1990-03-06
Pal, Asok
Cleaning and liquid contact with solids
Processes
Paints, varnishes, lacquers, or enamels, removal
134 40, 134 42, 252364, 252542, 252DIG8, B08B 308
Patent
active
049063030
ABSTRACT:
The invention relates to a process for the cleaning of articles or surfaces using a liquid cleaner of low viscosity containing N-methyl-2-pyrrolidone by immersion into a bath containing said cleaner. According to the invention the water content of the cleaner is kept at desired low values by means of a water absorption preventing layer applied on the surface of the cleaner and comprising at least one liquid, aliphatic hydrocarbon, which is immiscible with N-methyl-2-pyrrolidone and has a straight, branched or ring-closed carbon chain, or comprising microballoons or microspheres of a hydrophobic material which is insoluble in N-methyl-2-pyrrolidone.
REFERENCES:
patent: 4055515 (1977-10-01), Kirch
patent: 4085059 (1978-04-01), Smith et al.
patent: 4120810 (1978-10-01), Palmer
patent: 4276186 (1981-06-01), Bakos et al.
patent: 4428871 (1984-01-01), Ward et al.
patent: 4744834 (1988-05-01), Haq
patent: 4812255 (1989-03-01), Swoala
patent: 4828569 (1989-05-01), Heath et al.
patent: 4836950 (1989-06-01), Madsen et al.
"NMP. N-Methyl-2-Pyrrolidone, Handbook", GAF Corporation, International Operations, New York, U.S.A. (1972).
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