Substantially phosphate free mildly acidic cleaner for plastics

Details Substantially phosphate free mildly acidic cleaner for plastics Substantially phosphate free mildly acidic cleaner for plastics

1992-11-10

1995-02-14

Lieberman, Paul

Compositions

Water-softening or purifying or scale-inhibiting agents

252106, 252142, 252559, 134 40, C11D 104, C11D 122

Patent

active

053892836

ABSTRACT:
An effective phosphate free and organic solvent free aqueous acidic cleaner for soiled plastic surfaces is an aqueous solution or dispersion that has a pH in the range from about 4.4--about 6.1; that has a buffering capacity sufficiently high that at least 0.06 milliequivalents of a strong alkali per liter of the composition must be added to raise the pH of the composition by 0.1 pH unit; and that consists essentially of water and:
(A) from about 0.4 to about 10 milliequivalents per kilogram of total composition ("mEq/kg") of acids selected from the group consisting of hydroxycarboxylic and dicarboxylic acids;
(B) from about 1.4 to about 20 mEq/kg of salts containing anions of acids selected from the group consisting of hydroxycarboxylic and dicarboxylic acids; and
(C) from about 0.21 to about 3.3 grams per kilogram of total composition ("g/kg") of nonionic surfactant; and, optionally,
(D) an amount of hydrotrope material that is from about 0.25 to about 0.75 times the amount in g/kg of component (C); and
(E) a sufficient amount of biocidal material to inhibit growth of any bacteria and fungi that may be present in the composition.

REFERENCES:
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patent: 3928249 (1975-12-01), Nunziata et al.
patent: 4079020 (1978-03-01), Mills et al.
patent: 4144201 (1979-03-01), Wintertham et al.
patent: 4235752 (1980-11-01), Rossall et al.
patent: 4247408 (1989-01-01), Imamura et al.
patent: 4569782 (1986-02-01), Disch et al.
patent: 4895658 (1990-01-01), Amjad

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