| (19) |
 |
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(11) |
EP 0 675 191 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
13.12.1995 Bulletin 1995/50 |
| (43) |
Date of publication A2: |
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04.10.1995 Bulletin 1995/40 |
| (22) |
Date of filing: 30.03.1995 |
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| (84) |
Designated Contracting States: |
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DE FR GB NL |
| (30) |
Priority: |
30.03.1994 JP 85857/94
|
| (71) |
Applicants: |
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- COSMO RESEARCH INSTITUTE
Tokyo (JP)
- COSMO OIL COMPANY, LTD
Tokyo (JP)
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| (72) |
Inventors: |
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- Ueda, Sanae,
c/o Cosmo Res. Inst.
Satte-shi,
Saitama (JP)
- Takagi, Yukio,
c/o Cosmo Res. Inst.
Satte-shi,
Saitama (JP)
- Yamaoka, Shinji,
c/o Cosmo Res. Inst.
Satte-shi,
Saitama (JP)
|
| (74) |
Representative: Hansen, Bernd, Dr. Dipl.-Chem. et al |
|
Hoffmann, Eitle & Partner,
Patentanwälte,
Arabellastrasse 4
81925 München
81925 München (DE) |
|
| |
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| (54) |
Petroleum additive and process for producing alkaline earth metal salt of an aromatic
hydroxy-carboxylic acid |
(57) A petroleum additive containing an alkaline earth metal salt of an aromatic hydroxy-carboxylic
acid, wherein the alkaline earth metal salt is substantially free of an alkali metal
and the ratio of salicylic acid skeleton to total benzene nuclei is 0.4:1 to 0.95:1.
Also, a process for producing an alkaline earth metal salt of an aromatic hydroxy-carboxylic
acid involving: i) reacting an alkaline earth metal salt of a phenol with carbon dioxide;
ii) reacting the resulting free phenol with an alkaline earth metal reagent in the
presence of 2.0 to 15.0 mol of a dihydric alcohol per 1 mol of the alkaline earth
metal reagent (when no water is added) or in the presence of 0.01 to 10.0 mol of water
and 1.5 to 10.0 mol of a dihydric alcohol each per 1 mol of the alkaline earth metal
reagent; and iii) repeating the reaction with carbon dioxide.