Claims
- 1. The process of cleaning a polycarbonate surface that includes
- (a) washing the surface with a composition consisting essentially of an aqueous basic solution containing the members: alkali metal carbonate, alkali metal bi-carbonate and a mixture of mono and di esters of phosphoric acid,
- (b) then rinsing the surface with water, and
- (c) said members being in the relative weight percent proportions:
- (i) between 84 and 91% alkali metal carbonate
- (ii) between 8 and 12% alkali metal bi-carbonate
- (iii) between 0.5 and 1.5% of said mixture of mono and di esters of phosphoric acid.
- 2. The process of claim 1 wherein the solution pH is at or below 11.0.
- 3. The process of claim 1 wherein the solution pH is about 10.5.
- 4. The process of cleaning a polycarbonate surface that includes
- (a) washing the surface with a composition consisting essentially of an aqueous basic solution containing the members: alkali metal carbonate, alkali metal bi-carbonate and a mixture of mono and di esters of phosphoric acid,
- (b) then rinsing the surface with water,
- (c) and said members being in the relative weight % proportions:
- about 88% sodium carbonate
- about 11% sodium bi-carbonate
- about 1% of said mixture of mono and di esters of phosphoric acid.
- 5. The process of claim 4 wherein the balance of the solution consists of water.
- 6. The process of one of claims 1-4 wherein the solution consists of a relatively small volume of concentrate containing said members added to a relatively large volume of water.
- 7. The process of claim 6 wherein said small and large volumes are in the relative proportions 1.6 to 2 ounces of concentrate per gallon of water.
- 8. The process of claim 1 wherein said washing comprises spraying the surface with said solution.
- 9. The process of claim 8 wherein said spraying is continued for a time interval between 1.5 and 3.0 minutes.
- 10. The process of one of claims 1 and 8 which the temperature of the solution is between 120.degree. F. and 150.degree. F.
- 11. The process of claim 1 wherein said alkali metal carbonate is selected from the group consisting of sodium carbonate, potassium carbonate and lithium carbonate, and said alkali metal bi-carbonate is selected from the group consisting of sodium bi-carbonate, potassium bi-carbonate and lithium bi-carbonate.
- 12. The process of one of claims 1-5, 7-9 and 11, wherein the surface is defined by a container.
- 13. The process of one of claims 1-5, 7-9 and 11, wherein the surface has been previously exposed to ozone treated water.
- 14. The process of one of claims 1-5, 7-9 and 11, wherein said mono and di esters are selected from the formula group (A) and (B), as folows: ##STR2## where: R is an ethoxylated linear alcohol,
- n is an integer between 1 and 10, chosen for water solubility and low foaming.
BACKGROUND OF THE INVENTION
This application is a continuation-in-part of my prior application Ser. No. 402,778 filed July 28, 1982, now U.S. Pat. No. 4,434,069.
US Referenced Citations (19)
Non-Patent Literature Citations (1)
Entry |
Technical Bulletin, 7543-096, General Aniline and Film Corporation. |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
402778 |
Jul 1982 |
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