Photo bleach lipophilic fluid cleaning compositions
The present invention relates to compositions comprising photosenitizer that can be used to provide lipophilic fluids with bleaching capabilities, lipophilic fluid cleaning compositions having bleaching capabilities and processes of making and using same. Such compositions provide the cleaning benefits of typical lipophilic solvents and additional cleaning benefits that include bleaching.
1. A cleaning composition prepared by a process of dissolving:
a.) from about 1 ppm to about 1000 ppm of a sensitizer selected from the group consisting porphyrins, phthalocyanines, C 8 -C 70 aromatics, superoxide sensitizers, and mixtures thereof; and
b.) from about 100 ppm to about 10,000 ppm of an extender selected from the group consisting of furan, substituted furans, alkyl ethoxylates, polyethoxylates, alkyl polyethoxylates, polynuclear aromatics, imidazole, substituted imidazoles, pyrrole, substituted pyrroles, and mixtures thereof; into
c.) the balance of said cleaning composition, said balance consisting essentially of a siloxane lipophilic fluid, and optionally an adjunct ingredient; wherein said composition comprises less than about 1×10 −4 moles per liter of oxygen introduced into said composition during said process; and
d.) wherein said process is conducted while avoiding exposure to light.
2. A cleaning composition according to claim 1 comprising:
a.) from about 5 ppm to about 500 ppm of said sensitizer;
b.) from about 200 ppm to about 5,000 ppm of said extender.
3. A cleaning composition according to claim 2 comprising:
a.) from about 10 ppm to about 300 ppm of said sensitizer;
b.) from about 500 ppm to about 2,000 ppm of said extender.
4. The cleaning composition of claim 1 wherein:
a.) said sensitizer is selected from the group consisting of thioxanthone, acetonaphthone, and mixtures thereof;
b.) said extender is selected from the group consisting of alkyl ethoxylates, imidazole, 2,5 dimethyl furan, and mixtures thereof.
5. A cleaning composition according to claim 1 wherein said siloxane lipophilic fluid consists essentially of more than 50% by weight of decamethylcyclopentasiloxane.
6. A method of cleaning a fabric or surface comprising the steps of;
a.) providing the cleaning composition of claim 1 with sufficient oxygen such that said cleaning composition comprises oxygen at a level of 1×10 −9 moles per liter of said cleaning composition and sufficient light energy to generate bleaching species; and
b.) contacting said fabric or surface with said cleaning composition during or after said bleaching species are generated.
7. The method of claim 6 wherein said light energy is, based on light having a wavelength that is absorbed by the sensitizer employed, sufficient to yield greater than 1×10 −4 milliwatts/square meter of solution surface exposed to said light.
8. The method of claim 6 wherein said light energy is provided by a light source located in a domestic appliance suitable for cleaning fabrics.