Drycleaning method
View Patent ↗A drycleaning method is disclosed. The method uses a composition comprising 30 to 90 wt. % of a dipropylene glycol C 3 -C 4 alkyl ether, 5 to 65 wt. % of one or more C 10 -C 15 hydrocarbons, and 1 to 10 wt. % of water. The method combines acceptable stain removal with faster-than-expected evaporability, particularly at the elevated temperatures used in commercial drycleaning.
1. A method which comprises drycleaning a fabric or fiber at a temperature within the range of 77 to 90° C. using a composition comprising 45 to 80 wt. % of a dipropylene glycol C 3 -C 4 alkyl ether, 20 to 50 wt. % of one or more C 10 -C 15 hydrocarbons, and 2 to 5 wt. % of water.
2. The method of claim 1 wherein the composition comprises 60 to 70 wt. % of the dipropylene glycol C 3 -C 4 alkyl ether.
3. The method of claim 1 wherein the composition comprises 30 to 50 wt. % of the hydrocarbons.
4. The method of claim 1 wherein the hydrocarbons have a flash point greater than 60° C.
5. The method of claim 1 wherein the composition comprises 2.5 to 4 wt. % of water.
6. The method of claim 1 wherein the dipropylene glycol C 3 -C 4 alkyl ether is dipropylene glycol n-propyl ether.
7. The method of claim 1 wherein the dipropylene glycol C 3 -C 4 alkyl ether is dipropylene glycol n-butyl ether.
8. The method of claim 1 wherein the dipropylene glycol C 3 -C 4 alkyl ether is dipropylene glycol t-butyl ether.
9. The method of claim 1 wherein the fabric is used in a garment, bedding, furniture covering, rug, wall covering, drapery, napkin, or tablecloth.
10. The method of claim 1 wherein the fiber is selected from the group consisting of cotton, wool, silk, rayon, polyester, nylon, acetates, polyolefins, acrylics, spandex, and blends thereof.
11. A method which comprises: (a) agitating garments in the presence of a cleaning composition comprising 45 to 80 wt. % of a dipropylene glycol C 3 -C 4 alkyl ether, 20 to 50 wt. % of one or more C 10 -C 15 hydrocarbons, and 2 to 5 wt. % of water; (b) separating most of the cleaning composition from the garments; and (c) contacting the garments with air heated at a temperature within the range of 77 to 90° C. to remove the remaining cleaning composition from the garments.
12. The method of claim 11 wherein the cleaning composition further includes a detergent, anti-static agent, surfactant, fabric softener, brightener, disinfectant, anti-redeposition agent, fragrance, or a mixture thereof.
13. The method of claim 11 further comprising purifying the separated cleaning composition from step (b) by adsorption, distillation, or a combination of these methods.