Method and composition to inhibit staining of porcelain surfaces by manganese

Claim 3

The method of claim 1 wherein said oxidizing agent is a source of hypochlorite ions.

Claim 4

The method of claim 2 wherein 1 ppm to 5 ppm of said copolymers are dispensed into said water.

Claim 5

The method of claim 3 wherein about 3 ppm to about 4 ppm of said copolymers are dispensed into said water.

Claim 6

The method of claim 2 wherein said oxidizing agent is independently dispensed into said water concurrently with said copolymers.

Claim 7

In an integrated toilet tank dispenser with independent first and second dispensing means, wherein said first dispensing means is adapted to dispense ingredients which provide at least 3 ppm of available chlorine to the water of a toilet bowl, and wherein said second dispensing means is adapted to receive a cake of second ingredients and to disperse a sufficient portion of said second ingredients to a toilet to provide 2 ppm to 30 ppm of said second ingredients to a toilet bowl, the improvement wherein said cake of second ingredients is a solid cake comprising: A. 5% to 30% of a material adapted to inhibit manganese staining, consisting essentially of copolymers of alternating ethylene and maleic acid anhydride having a molecular weight between about 20,000 and 100,000 atomic mass units; B. 50% to 90% of a water-soluble surfactant selected from the group consisting of the hypochlorite-stable alkyl sulfates and paraffin sulfonates; and C. 0% to 45% of optional ingredients selected from the group consisting of dyes, perfumes, water-soluble salts, and mixtures thereof; wherein said cake of second ingredients is essentially free of manganese (II) oxidating material and phosphate esters.

Claim 8

In an integrated toilet tank dispenser with independent first and second dispensing means, wherein said first dispensing means is adapted to dispense ingredients which provide at least 3 ppm of available chlorine to the water of a toilet bowl, and wherein said second dispensing means is adapted to receive a cake of second ingredients and to disperse a sufficient portion of said second ingredients to a toilet to provide 2 ppm to 30 ppm of said second ingredients to a toilet bowl, the improvement wherein said cake of second ingredients is a solid cake comprising: A. 5% to 30% of a material adapted to inhibit manganese staining, consisting essentially of copolymers of alternating ethylene and maleic acid anhydride having a molecular weight between about 20,000 and 100,000 atomic mass units; B. 50% to 90% of a water-soluble surfactant selected from the group consisting of the hypochlorite-stable alkyl sulfates and paraffin sulfonates; and C. 0% to 45% of optional ingredients selected from the group consisting of dyes, perfumes, water-soluble salts, and mixtures thereof; wherein said cake of second ingredients is essentially free of manganese (II) oxidating material and phosphate esters.

Claim 9

The invention of claim 6 wherein said optional ingredients include isobornyl acetate at a ratio of said surfactant to isobornyl acetate of from about 4:1 to about 50:1.

Claim 10

The invention of claim 6 wherein said optional ingredients include a water-soluble salt selected from the group consisting of sodium bromide, sodium chloride and other water-soluble salts of a similar nature.