Methods for cleaning recyclable substrates or containers
US8153577B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 12, 2010 |
| Grant date | Apr 10, 2012 |
| Priority date | — |
| Expiry date | Aug 12, 2030 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC11D2111/18
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for treating a contaminated substrate comprising the steps of contacting an emulsion to a substrate surface soiled with one or more contaminants, the emulsion comprising a blend of dibasic esters, whereby the emulsion is capable of emulsifying all or some of the contaminants, forming a resulting emulsion; removing substantially all of the resulting emulsion from the substrate surface; and, optionally, in recovering the contaminant, adding an amount of water or a solvent to the resulting emulsion effective to form at least a first phase layer comprising a substantial amount of the contaminant and a second phase layer comprising a substantial amount of the emulsion. The dibasic esters can be a blend of adipic, glutaric, and succinic diacids, and, in one particular embodiment, the blend comprises dialkyl methylglutarate and dialkyl ethylsuccinate, wherein the alkyl groups individually comprise a C1-C12 hydrocarbon group. The one or more surfactants and additional components can be added.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.