EP0199131A2
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Surfactants derived from citric acid
Assignee: Raffineria Olii Lubrificanti "rol" SpA
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Filing: 1986-03-25
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Granted: —
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Expires: 2006-03-25
Abstract
Abstract Surfactants derived from citric acid having the wherein: R, R', R 2 are equal or different from each other and are H, an alkaline metal, alkaline-earth metal or - NH4 cation, a cation of an organic ammonium base or a group having the formula: general formula: wherein: A is a C 2- C 4 oxyalkylene group, n is a number ranging from 1 to 20 and R 3 is a C 8 -C 20 alkyl group, at least one of said R, R', R 2 being an -A n -R 3 group, and wherein the -OH group of the compound of formula (I) can be esterified or etherified.
Inventors
- 👤 Luigi Turchini
- 👤 Salvatore Dr. Garlisi
- 👤 Aurelio Dr. Albanini
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 19:27
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/66; A; A61; A61K; A61K8/00; A61K8/18; A61K8/30; A61K8/33; A61K8/37; C11; C11D; C11D1/00; C11D1/02; C11D1/04; C11D1/08; C11D1/66; C11D1/667; A61Q; A61Q19/00; A61Q19/10; A61Q5/00; A61Q5/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
93 words
Citric acid esters having the general formula wherein: R, R', R 2 are equal or different from each other and represent a hydrogen atom, an alkaline metal,alkaline-earth metal or ammonium cation, a cation of an organic ammonium base, or a group having the formula: wherein: A is a C 2 -C 4 oxyalkylene group, n is a number ranging between 1 and 20 and R 3 is a C 8 -C 20 alkyl group, with the proviso that at least one of R, R', R 2 is an -A n -R 3 group.
Claim 2
Dependent Claim
93 words
Citric acid esters having the general formula wherein: R, R', R 2 are equal or different from each other and represent a hydrogen atom, an alkaline metal,alkaline-earth metal or ammonium cation, a cation of an organic ammonium base, or a group having the formula: wherein: A is a C 2 -C 4 oxyalkylene group, n is a number ranging between 1 and 20 and R 3 is a C 8 -C 20 alkyl group, with the proviso that at least one of R, R', R 2 is an -A n -R 3 group.
Claim 3
Dependent Claim
46 words
Esters according to claim 1, wherein in group - An -R 3 (II), A is an oxyethylene group -CH 2 CH 2 O-, n is a number ranging between 4 and 8, and R 3 is an alkyl group containing from 10 to 16 carbon atoms.
Claim 4
Dependent Claim
44 words
Esters according to claim 1, wherein R is -A n -R 3 and R' and R 2 are sodium, potassium, magnesium or ammonium cations or wherein R' is -A n -R 3 and R and R 2 are sodium, potassium, magnesium or ammonium cations.
Claim 5
Dependent Claim
45 words
Esters according to claim 1, wherein R and R' are -A n -R 3 and R 2 is a sodium, potassium, magnesium or ammonium cation or R and R 2 are -A n -R 3 and R' is a sodium, potassium, magnesium or ammonium cation.
Claim 6
Dependent Claim
24 words
Esters according to claim 1, wherein the -OH group of the ester of formula (I) has been esterified or etherified according to conventional methods.
Claim 7
Dependent Claim
77 words
A process for the preparation of esters having the formula (I) according to claim 1, which comprises esterifying citric acid with an aliphatic polyoxyalkylated alcohol having the formula: wherein: R 3 , A and n are defined as in claim 1, at a temperature of from 150 to 190°C, with continuous removal of the reaction water, and optionally converting the obtained product into a salt by means of an alkaline, alkaline-earth or ammonium base or an amine.
Claim 8
Dependent Claim
46 words
A process according to claim 6, wherein in the alcohol of formula (III),A is an oxyethylene group - CH 2 CH 2 O-, n is a number ranging between 4 and 8, and R 3 is an alkyl group containing from 10 to 16 carbon atoms.
Claim 9
Dependent Claim
28 words
A process according to claim 6 or 7, wherein the base is selected from sodium, potassium, magnesium or ammonium hydroxide, sodium or potassium carbonate or bicarbonate and triethanolamine.
Claim 10
Dependent Claim
23 words
Cosmetic and detergent compositions containing one or more citric acid esters of formula (I) according to any one of claims 1 to 5.
Claim 11
Dependent Claim
21 words
Use of the citric acid esters of formula (I) according to any one of claims 1 to 5 as surface-active agents.
References Cited (Backward Citations)
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