Bottlewash additive comprising an alkyl diphenylene oxide disulfonate
View Patent ↗An alkaline bottlewashing concentrate effective for removal of mold and for protecting polyethylene terephthalate containers including at least one cleaning/protecting surfactant which is a C 4 to C 20 alkyl diphenylene oxide disulfonate, an ethoxylated alcohol sulfonate, an alkyl polyether phosphate ester, an aryl polyether phosphate ester, an alkylaryl polyether phosphate ester, a polycarboxylated ethylene oxide condensate of a fatty alcohol, or a mixture thereof. The cleaning composition is compatible with polyethylene terephthalate.
1. A method of cleaning and protecting polyalkylene terephthalate containers, the method comprising the step of contacting said polyalkylene terephthalate containers with an alkaline composition comprising, the alkaline composition formed by diluting a concentrate, the concentrate comprising
about 1% to about 20% of at least one C 16 to C 20 alkyl diphenylene oxide disulfonate and mixtures thereof;
about 1% to about 20% of a nonionic defoamer; and
about 1% to about 40% of at least one sequestrant selected from the group consisting of phosphonates, gluconates, phosphates and mixtures thereof.
2. The method of claim 1 wherein said alkaline composition comprises at least one first sequestrant which is a phosphonate sequestrant and at least one second sequestrant which is a phosphate sequestrant, a phosphonate sequestrant, a gluconate sequastrant or mixture thereof.
3. The method of claim 2 wherein said alkaline composition comprises at least one first sequestrant which is a phosphonate sequestrant and at least one second sequestrant which is a gluconate sequestrant.
4. The method of claim 1 wherein said C 16 to C 20 alkyl diphenylene oxide disulfonate and mixtures thereof is present in said alkaline composition at a concentration of about 0.002 wt-% to about 2 wt-% alter diluting said concentrate.
5. The method of claim 1 wherein said nonionic defoamer is a block copolymer of ethylene oxide and propylene oxide.
6. The method of claim 1 wherein said alkaline composition comprises at least one C 16 alkyl diphenylene oxide disulfonate.