Claims
- 1. An antifreeze mixture for internal combustion engines based on ethylene glycol and/or propylene glycol which is free of nitrite and phosphate, consisting essentially of
- a) 1-5% by weight of an alkali metal salt of a C.sub.4 -C.sub.16 -alkenylsuccinic acid,
- b) 0.1-1% by weight of silicate of the formula II
- (MO).sub.q SiO.sub.4-q/2 (II)
- where
- M is an alkali metal and
- q is from 0.4 to 4,
- c) 0.01-0.2% by weight of a silicate stabilizer,
- d) 0-0.5% by weight of an alkali metal nitrate,
- e) 0.05-2.0% by weight of benzotriazole or tolutriazole,
- f) 0.5-2% by weight of borax,
- g) 0.05-1% by weight of NaOH,
- h) 0.01-0.15% by weight of an oligo- or polycarboxylic acid having a molecular weight of 1000 to 100,000, and
- i) ethylene glycol and/or propylene glycol.
- all the percentages being based on the amount of ethylene glycol and/or propylene glycol present in the antifreeze mixture.
- 2. The antifreeze mixture of claim 1, wherein component (a) is the sodium salt of a C.sub.8 -, C.sub.9 - or C.sub.12 -alkenylsuccinic acid or a mixture thereof.
- 3. The antifreeze mixture of claim 1, wherein component (c) is a silicate stabilizer of the formula ##STR4## where Y is a divalent aliphatic or cycloaliphatic radical of from 1 to 10 carbon atoms or a phenylenealkylene group of from 7 to 10 carbon atoms and
- n is 1 or 2, wherein, when n=1, X is an OR.sup.3 group where R.sup.3 is straight-chain, branched or cyclic alkyl of from 1 to 13 carbon atoms which may be interrupted by oxygen atoms or acyl of up to 9 carbon atoms, and R.sup.1 and R.sup.2, which are identical or different, are each a straight-chain or branched or cyclic alkyl of from 1 to 13 carbon atoms which may be interrupted by oxygen, or aryl or aralkyl of up to 20 carbon atoms, and when n=2, X is oxygen, R.sup.1 is an alkali metal and R.sup.2 is as defined above.
Priority Claims (1)
Number |
Date |
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Kind |
3832592 |
Sep 1988 |
DEX |
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Parent Case Info
This application is a continuation of application Ser. No. 409,344, filed on Sept. 19, 1989, now abandoned.
US Referenced Citations (7)
Foreign Referenced Citations (6)
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0283806 |
Mar 1988 |
EPX |
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DEX |
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DEX |
2943963 |
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DEX |
3440194 |
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DEX |
205183 |
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JPX |
Non-Patent Literature Citations (3)
Entry |
Kirth-Othmer Encyclopedia of Chemical Technology, Third Edition, vol. 3, pp. 79-95. |
Kirth-Othmer Encyclopedia of Chemical Technology, Third Edition, vol. 20, p. 864. |
Ullmanns Encyklopadie der technischen Chemie, 3rd Ed., vol. 20, p. 864. |
Continuations (1)
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Number |
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Parent |
409344 |
Sep 1989 |
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