Improved cleaning solvent containing non-azeotropic mixtures of

Details Improved cleaning solvent containing non-azeotropic mixtures of Improved cleaning solvent containing non-azeotropic mixtures of

1976-12-10

1978-04-25

Pitlick, Harris A.

Compositions

Water-softening or purifying or scale-inhibiting agents

134 31, 134 38, 134 40, C23G 502, C11D 750, C11D 730

Patent

active

040861791

ABSTRACT:
Improved cleaning compositions for the removal of various forms of contamination from printed circuit boards and other related electronic equipment in vapor cleaning processes are disclosed, including major amounts of 1,1,1-trichloroethane and an amount of normal propanol less than that in the true azeotropic mixture of these components, generally from about 1.0 to less than 4.75 weight percent of the normal propanol. In addition, vapor cleaning processes utilizing such solvent compositions are also disclosed, and in a preferred embodiment, the composition includes about 96.0 weight percent of the 1,1,1-trichloroethane and about 4.0 weight percent of the normal propanol.

REFERENCES:
patent: 2371644 (1945-03-01), Petering et al.
patent: 3192273 (1965-06-01), Bissinger
patent: 3637513 (1972-01-01), Schneider
patent: 3767585 (1973-10-01), Sawabe et al.
patent: 3932297 (1976-01-01), Clementson et al.

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