EP0119641A1
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EP
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Aqueous alkaline cleaning composition
Assignee: Unilever PLC
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Filing: 1984-02-07
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Granted: —
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Expires: 2004-02-07
Abstract
Abstract An alkaline composition and method of cleaning aluminium surfaces is disclosed which avoids discoloring or tarnishing of the metal surface. The composition comprises a mixture of alkali metal metasilicate and a compound chosen from the group consisting of sodium carbonate, potassium carbonate, lithium carbonate, potassium orthophosphate and sodium orthophosphate and mixtures thereof, wherein the metasilicate salt is present in an effective amount up to about 3% by weight of the composition and wherein the pH ranges above about 12.0.
Inventors
- 👤 Fred K. Rubin
- 👤 David Van Blarcom
- 👤 Daniel Joseph Fox
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 20:34
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/14; C23G1/22
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
83 words
An alkaline cleaning composition for aluminum surfaces which avoids discoloring or tarnishing of the metal surface, optionally comprising a surfactant and conventional adjunct materials characterized in that it comprises a mixture of alkali metal metasilicate and a compound chosen from the group consisting of sodium carbonate, potassium carbonate, lithium carbonate, potassium orthophosphate and sodium orthophosphate and mixtures thereof, the metasilicate salt is present in an effective amount up to about 3% by weight of the composition and the pH ranges above about 12.0.
Claim 2
Dependent Claim
83 words
An alkaline cleaning composition for aluminum surfaces which avoids discoloring or tarnishing of the metal surface, optionally comprising a surfactant and conventional adjunct materials characterized in that it comprises a mixture of alkali metal metasilicate and a compound chosen from the group consisting of sodium carbonate, potassium carbonate, lithium carbonate, potassium orthophosphate and sodium orthophosphate and mixtures thereof, the metasilicate salt is present in an effective amount up to about 3% by weight of the composition and the pH ranges above about 12.0.
Claim 3
Dependent Claim
57 words
A composition according to claim 1 characterized in that it comprises a mixture of sodium carbonate and sodium metasilicate in the ratio of about 20:1 to about 1:2, respectively, the sodium metasilicate is present in an effective amount up to about 1% by weight of the composition and the pH ranges from about 12.0 to about 12.7.
Claim 4
Dependent Claim
42 words
A composition according to claim 2 characterized in that the ratio of sodium carbonate to sodium metasilicate is about 3.5:1 to about 1:4 and the sodium metasilicate is present in an effective amount up to about 2% by weight of the composition.
Claim 5
Dependent Claim
57 words
A composition according to claim 1 characterized in that it comprises a mixture of potassium carbonate and sodium metasilicate in the ratio of about 10:1 to about 1:1, respectively, the sodium metasilicate is present in an effective amount up to about 2% by weight of the composition and the pH ranges from about 12.0 to about 13.1.
Claim 6
Dependent Claim
41 words
A composition according to claim 4 characterized in that the potassium carbonate to sodium metasilicate ratio is about 4:1 to about 2.8:1 and the sodium metasilicate is present in an effective amount up to about 2.5% by weight of the composition.
Claim 7
Dependent Claim
57 words
A composition according to claim 1 characterized in that it comprises a mixture of lithium carbonate and sodium metasilicate in the ratio of about 1:2 to about 1:3, respectively, the sodium metasilicate is present in an effective amount up to about 2% by weight of the composition and the pH is from about 12.0 to about 12.5.
Claim 8
Dependent Claim
57 words
A composition according to claim 1 characterized in that it comprises a mixture of potassium orthophosphate and sodium metasilicate in the ratio of about 30:1 to about 1:1, respectively, the sodium metasilicate is present in an effective amount up to about 1% by weight of the composition and the pH ranges from about 12.0 to about 13.1.
Claim 9
Dependent Claim
51 words
A composition according to claim 7 characterized in that the ratio of potassium orthophosphate to sodium metasilicate is about 10:1 to about 1:2, the sodium metasilicate is present in an effective amount up to about 2% by weight of the composition and the pH ranges from about 12.7 to about 13.1.
Claim 10
Dependent Claim
51 words
A composition according to claim 1 characterized in that the ratio of sodium orthophosphate to sodium metasilicate is about 10:1 to about 1:1, the sodium metasilicate is present in an effective amount up to about 2% by weight of the composition and the pH ranges from about 12.5 to about 12.8.
Claim 11
Dependent Claim
57 words
A composition according to claim 9 characterized in that it comprises a mixture of sodium orthophosphate and sodium metasilicate in the ratio of about 10:1 to about 2:1, respectively, the sodium metasilicate is present in an effective amount up to about 1% by weight of the composition and the pH ranges from about 12.4 to about 12.7.
References Cited (Backward Citations)
US3655582A
Cited
US4093566A
Cited
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