Claims
- 1. An aqueous cleaning solution consisting essentially of:
- a) from about 1% by weight to about 12% by weight of caustic based on total solution;
- b) from about 0.1% by weight to about 1% by weight of phosphate builder on total solution;
- c) from about 0.05% by weight to about 3% by weight of chelating agent based on total solution;
- d) from about 0.1% by weight to about 6% by weight of solubilizer based on total solution;
- e) from about 1% by weight to about 7% by weight of nonionic surfactant based on total solution; and
- f) the balance of the total solution being water to 100%.
- 2. The solution of claim 1 wherein the caustic is sodium hydroxide or potassium hydroxide.
- 3. The solution of claim 2 wherein the chelating agent is selected from the group consisting of nitrilotriacetic acid, ethylenediamine tetraacetic acid and salts of said acids.
- 4. The solution of claim 3 wherein the builder is trisodium phosphate or tetrapotassium pyrophosphate.
- 5. The solution of claim 4 wherein the nonionic surfactant is an ethoxylated alcohol or an ethoxylated alkylphenol.
- 6. An aqueous cleaning solution consisting essentially of:
- a) from about 6% by weight to about 10% by weight of caustic based on the total solution;
- b) from about 0.1% by weight to about 1% by weight of phosphate builder based on total solution;
- c) from about 0.5% by weight to about 3% by weight of solubilizer based on total solution;
- d) from about 0.1% by weight to about 1% by weight of chelating agent based on total solution;
- e) from about 2% by weight to about 7% by weight of nonionic surfactant based on total solution; and
- f) the balance of the total solution being water to 100%.
- 7. The composition of claim 6 wherein the phosphate builder is sodium phosphate or tetrapotassium pyrophosphate.
- 8. The solution of claim 7 wherein the caustic is sodium hydroxide or potassium hydroxide.
- 9. The solution of claim 8 wherein the chelating agent is selected from the group consisting of nitrilotriacetic acid, ethylenediamine tetracetic acid and the salts of said acids.
- 10. The solution of claim 9 wherein the nonionic surfactant is an ethoxylated alcohol or an ethoxylated alkylphenol.
- 11. The solution of claim 10 wherein
- (a) the solubilizer is an
- i) alkali metal or ammonium salt of alkylbenzenesulfonic acid or
- ii) partial salt of partially estified phosphoric acid of the formula
- X.sub.n+2 P.sub.n O.sub.3n+1
- wherein X is alkali metal, ammonium, R or R--(O--CH.sub.2 CH.sub.2 --) y--wherein R is alkyl of up to 18 carbon atoms and x is an average number from 1 to about 12 inclusive, or mixtures thereof, and
- (b) the nonionic surfactant is of the formula
- R"--(OCH.sub.2 CH.sub.2 --)--OH
- wherein R" is alkyl of from about 8 to about 24 carbon atoms inclusive or alkylphenyl wherein the alkyl moiety has from about 8 to about 12 carbon atoms and y is an average number from 1 to about 12.
- 12. The method of removing polymeric residues from mechanical equipment used in the production or processing of polymers, which comprises soaking said equipment at ambient temperatures in an aqueous cleaning solution consisting essentially of:
- a) from about 1% by weight to about 12% by weight of caustic based on total solution;
- b) from about 0.1% by weight to about 1% by weight of phosphate builder based on total solution;
- c) from about 0.05% by weight to about 3% by weight of chelating agent based on total solution;
- d) from about 0.1% by weight to about 6% by weight of solubilizer based on total solution;
- e) from about 1% by weight to about 7% by weight of nonionic surfactant based on total solution; and
- f) the balance of the total solution being water to 100%.
- 13. The method of claim 12 wherein the caustic is sodium hydroxide or potassium hydroxide.
- 14. The method of claim 13 wherein the chelating agent is selected from the group consisting of nitrilotriacetic acid or ethylenediamine tetraacetic acid or the salts of said acids.
- 15. The method of claim 14 wherein the builder is trisodium phosphate or tetrapotassium pyrophosphate.
- 16. The method of claim 15 wherein the nonionic surfactant is an ethoxylated alcohol or an ethoxylated alkylphenol.
- 17. The method of claim 12, wherein said aqueous cleaning solution consist essentially of:
- a) from about 6% by weight to about 10% by weight of caustic based on total solution;
- b) from about 0.1% by weight to about 1% by weight of phosphate builder based on total solution;
- c) from about 0.1% by weight to about 1% by weight of chelating agent based on total solution;
- d) from about 0.5% by weight to about 3% by weight of solubilizer based on total solution;
- e) from about 2% by weight to about 7% by weight of nonionic surfactant based on total solution; and
- f) the balance of the total solution being water to 100%.
- 18. The method of claim 17, wherein the caustic is sodium hydroxide or potassium hydroxide and the phosphate builder is sodium phosphate or tetrapotassium phyrophosphate.
- 19. The method of claim 18, wherein the chelating agent is selected from the group consisting of nitrilotriacetic acid, ethylenediamine tetracetic acid and the salts of said acids.
- 20. The method of claim 19, wherein
- (a) the solubilizer is an
- i) alkali metal or ammonium salt of alkylbenzenesulfonic acid, or
- ii) partial salt of partially esterified phosphoric acid of the formula
- X.sub.n+2 P.sub.n O.sub.3n+1
- wherein X is alkali metal, ammonium, R or R--(O--CH.sub.2 CH.sub.2).sub.y -- wherein R is allyl of up to 18 carbon atoms and x is an average number from 1 to about 12 inclusive, or mixtures thereof, and
- (b) the nonionic surfactant is of the formula
- R"--(OCH.sub.2 CH.sub.2 --).sub.y --OH
- wherein R" is alkyl of from about 8 to about 24 carbon atoms inclusive or alkylphenyl wherein the alkyl moiety has from about 8 to about 12 carbon atoms and y is an average number from 1 to about 12.
Parent Case Info
This is a continuation-in-part of application Ser. No. 07/576,039 filed Aug. 31, 1990 now abandoned Jan. 24, 1992.
US Referenced Citations (9)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
576039 |
Aug 1990 |
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