Claims
- 1. A liquid coolant composition comprising:
- 85-99 weight % of water selected from the group consisting of alcohols and glycols; and
- 1-15 weight % of a rust preventive composition which contains both calcium nitrate and magnesium nitrate and at least one rust preventative selected from the group consisting of phosphates, borates, nitrates, molybdates, benzoates, silicates, triazoles, thiazoles, sebacic acid and octylic acid, said calcium nitrate and said magnesium nitrate together being contained by 0.00005-0.01 weight % at elemental metal concentration.
- 2. The liquid coolant composition of claim 1 wherein the amount of said calcium nitrate and magnesium nitrate at elemental metal concentration is 0.00005-0.005 weight %.
- 3. The liquid coolant composition of claim 1 containing said calcium nitrate and said magnesium nitrate at weight ratio of about 1/2.
- 4. The liquid coolant composition of claim 2 containing said calcium nitrate and said magnesium nitrate at weight ratio of about 1/2.
- 5. The liquid coolant composition of claim 1 wherein said rust preventive composition further contains 0,001-0,02 weight % of at at least one acid selected from the group consisting of polyphosphoric acids and polycarboxylic acids.
- 6. The liquid coolant composition of claim 2 wherein said rust preventive composition further contains 0.001-0.02 weight % of at at least one acid selected from the group consisting of polyphosphoric acids and polycarboxylic acids.
- 7. The liquid coolant composition of claim 1 wherein each of said at least one rust preventative is contained by less than 5 weight %.
- 8. The liquid coolant composition of claim 1 further comprising less than 4 weight % of water.
- 9. The liquid coolant composition of claim 1 having pH value between 7.0 and 11.0.
- 10. The liquid coolant composition of claim 5 wherein each of said at least one rust preventative is contained by less than 5 weight %.
- 11. The liquid coolant composition of claim 6 wherein each of said at least one rust preventative is contained by less than 5 weight %.
- 12. The liquid coolant composition of claim 5 further comprising less than 4 weight % of water.
- 13. The liquid coolant composition of claim 6 further comprising less than 4 weight % of water.
- 14. The liquid coolant composition of claim 5 having pH value between 7.0 and 11.0.
- 15. The liquid coolant composition of claim 6 having pH value between 7.0 and 11.0.
- 16. The liquid coolant composition of claim 5 containing said calcium nitrate and said magnesium nitrate at weight ratio of about 1/2.
Priority Claims (1)
Number |
Date |
Country |
Kind |
6-098691 |
May 1994 |
JPX |
|
Parent Case Info
This is a continuation-in-part of application Ser. No. 08/384,075, Feb. 6, 1995 now abandoned.
US Referenced Citations (5)
Foreign Referenced Citations (1)
Number |
Date |
Country |
0552988 |
Jul 1993 |
EPX |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
384075 |
Feb 1995 |
|