Foam dispenser for use in foaming cleaning composition

1. A foam dispenser comprising:

(a) a container comprising a cleaning composition, wherein the cleaning composition comprises about 0.01 wt. % to about 10 wt. % total amount of surfactant, at least about 80 wt. % water, and glycol ether solvent consisting of one or more glycol ethers each having a HLB value of at least about 6.9 and an OHLB value of between about 12 and about 20, wherein the weight ratio of the foam-boosting solvent to the total amount of surfactant is at least about 1:100 and wherein the cleaning composition is substantially free of propellant; and

(b) a mechanical foaming head comprising:

(i) an air and liquid mixing chamber;

(ii) an air inlet for delivering air to the air and liquid mixing chamber;

(iii) a liquid inlet line for delivering the cleaning composition from the container to the air and liquid mixing chamber; and

(iv) an outlet line for delivering a mixture of air and cleaning composition from the air and liquid mixing chamber outside of the mechanical foaming head, wherein the mixture includes at least 50% foam.

2. A foam dispenser unit according to claim 1 , wherein the dispenser head further comprises a screen provided within the outlet line.

3. A foam dispenser according to claim 1 , wherein the cleaning composition comprises between about 0.1 wt. % and about 5 wt. % of the glycol ether.

4. A foam dispenser according to claim 1 , wherein the cleaning composition comprises between about 0.5 wt. % and about 3 wt. % of the glycol ether.

5. A foam dispenser according to claim 1 , wherein the weight ratio of the glycol ether to the total amount of surfactant is between about 1:40 and about 40:1.

6. A foam dispenser according to claim 1 , wherein the weight ratio of the glycol ether to the total amount of surfactant is between about .05:1 and about 20:1.

7. A foam dispenser according to claim 1 , wherein the glycol ether has the formula:

wherein R is a C 1 -C 6 aliphatic or aromatic group, R′ is H, CH 3 , or C 2 H 5 , and n has a value of at least 1.

8. A foam dispenser according to claim 1 , wherein the glycol ether comprises at least one of propylene glycol butyl ether, dipropylene glycol methyl ether, dipropylene glycol propyl ether, ethylene glycol butyl ether diethylene glycol propyl ether, and triethylene glycol methyl ether.

9. A foam dispenser according to claim 1 , wherein the glycol ether comprises a derivative of a glycol ether having the formula:

wherein R is a C 1 -C 6 aliphatic or aromatic group, R′ is H, CH 3 , or C 2 H 5 , n has a value of at least 1, and A comprises at least one of an ester, an amide, and an ether.

10. A foam dispenser according to claim 1 , wherein the derivative of a glycol ether comprises propylene glycol methyl ether acetate.

11. A foam dispenser according to claim 1 , wherein the glycol ether comprises glycol having at least four carbon atoms.

12. A foam dispenser according to claim 1 , wherein the foaming dispenser head comprises a trigger that is constructed to be actuated by finger pressure.

13. A foam dispenser according to claim 1 , wherein the foam dispenser provides a composition containing at least 50 wt. % foam according to a 15 second vertical separation test.

14. A foam dispenser according to claim 1 , wherein the foam dispenser provides a foam having less than 1 ppm non-air containing propellant when measured using a gas chromatographic head space analysis.

15. A foam dispenser comprising:

(a) a container comprising a cleaning composition, wherein the cleaning composition comprises about 0.01 wt. % to about 10 wt. % total amount of surfactant, at least about 80 wt. % water, and glycol solvent selected from the group consisting of n-propoxypropanol, propylene glycol butyl ether, dipropylene glycol methyl ether, dipropylene glycol propyl ether, ethylene glycol butyl ether, dipropylene glycol methyl ether, and triethylene glycol methyl ether, and wherein the cleaning composition is substantially free of a propellant; and

(b) a mechanical foaming head comprising:

(i) an air and liquid mixing chamber;

(ii) an air inlet for delivering air to the air and liquid mixing chamber;

(iii) a liquid inlet line for delivering the cleaning composition from the container to the air and liquid mixing chamber; and

(iv) an outlet line for delivering a mixture of air and the cleaning composition from the air and liquid mixing chamber outside of the mechanical foaming head, wherein the mixture includes at least 50% foam.