EP0238635B1 - Composition detergente non ionique pour materiaux textiles fins - Google Patents
Composition detergente non ionique pour materiaux textiles fins Download PDFInfo
- Publication number
- EP0238635B1 EP0238635B1 EP19860906122 EP86906122A EP0238635B1 EP 0238635 B1 EP0238635 B1 EP 0238635B1 EP 19860906122 EP19860906122 EP 19860906122 EP 86906122 A EP86906122 A EP 86906122A EP 0238635 B1 EP0238635 B1 EP 0238635B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- surfactant
- alkyl
- alkenyl
- amine oxide
- glycoside
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 45
- 239000003599 detergent Substances 0.000 title claims abstract description 31
- 239000004744 fabric Substances 0.000 title claims abstract description 20
- 239000004094 surface-active agent Substances 0.000 claims abstract description 66
- 150000001412 amines Chemical class 0.000 claims abstract description 37
- 229930182470 glycoside Natural products 0.000 claims abstract description 30
- 150000002338 glycosides Chemical class 0.000 claims abstract description 29
- 125000000217 alkyl group Chemical group 0.000 claims description 38
- 239000000463 material Substances 0.000 claims description 21
- 239000004615 ingredient Substances 0.000 claims description 20
- 125000003342 alkenyl group Chemical group 0.000 claims description 14
- 125000004432 carbon atom Chemical group C* 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- -1 alkenyl di (2-hydroxyethyl) amine Chemical compound 0.000 claims description 13
- 238000004900 laundering Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 7
- 150000001720 carbohydrates Chemical class 0.000 claims description 5
- UTTVXKGNTWZECK-UHFFFAOYSA-N n,n-dimethyloctadecan-1-amine oxide Chemical group CCCCCCCCCCCCCCCCCC[N+](C)(C)[O-] UTTVXKGNTWZECK-UHFFFAOYSA-N 0.000 claims description 5
- 239000004677 Nylon Substances 0.000 claims description 4
- 229920001778 nylon Polymers 0.000 claims description 4
- 229920000728 polyester Polymers 0.000 claims description 4
- 210000002268 wool Anatomy 0.000 claims description 4
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 claims description 3
- 238000013019 agitation Methods 0.000 claims description 3
- 239000008103 glucose Substances 0.000 claims description 3
- 239000004215 Carbon black (E152) Substances 0.000 claims description 2
- 229930195733 hydrocarbon Natural products 0.000 claims description 2
- 125000004430 oxygen atom Chemical group O* 0.000 claims 1
- 239000007864 aqueous solution Substances 0.000 abstract description 2
- 239000002736 nonionic surfactant Substances 0.000 description 7
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 5
- 230000003068 static effect Effects 0.000 description 5
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical group C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 3
- 239000003945 anionic surfactant Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 150000002191 fatty alcohols Chemical class 0.000 description 3
- 238000009472 formulation Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 125000000954 2-hydroxyethyl group Chemical group [H]C([*])([H])C([H])([H])O[H] 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical group CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 150000001298 alcohols Chemical class 0.000 description 2
- 125000001931 aliphatic group Chemical group 0.000 description 2
- 125000003545 alkoxy group Chemical group 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- SYELZBGXAIXKHU-UHFFFAOYSA-N dodecyldimethylamine N-oxide Chemical compound CCCCCCCCCCCC[N+](C)(C)[O-] SYELZBGXAIXKHU-UHFFFAOYSA-N 0.000 description 2
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 125000005024 alkenyl aryl group Chemical group 0.000 description 1
- 125000002877 alkyl aryl group Chemical group 0.000 description 1
- 125000002947 alkylene group Chemical group 0.000 description 1
- 125000005018 aryl alkenyl group Chemical group 0.000 description 1
- 125000003710 aryl alkyl group Chemical group 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 150000001721 carbon Chemical group 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 239000003093 cationic surfactant Substances 0.000 description 1
- 150000001860 citric acid derivatives Chemical class 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229930182478 glucoside Natural products 0.000 description 1
- 150000008131 glucosides Chemical class 0.000 description 1
- 125000005020 hydroxyalkenyl group Chemical group 0.000 description 1
- 125000002768 hydroxyalkyl group Chemical group 0.000 description 1
- CBLJNXZOFGRDAC-UHFFFAOYSA-N n,n-bis(2-hydroxyethyl)octadecan-1-amine oxide Chemical compound CCCCCCCCCCCCCCCCCC[N+]([O-])(CCO)CCO CBLJNXZOFGRDAC-UHFFFAOYSA-N 0.000 description 1
- ONLRKTIYOMZEJM-UHFFFAOYSA-N n-methylmethanamine oxide Chemical compound C[NH+](C)[O-] ONLRKTIYOMZEJM-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000002304 perfume Substances 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 125000001453 quaternary ammonium group Chemical group 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000003760 tallow Substances 0.000 description 1
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 125000005270 trialkylamine group Chemical group 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/66—Non-ionic compounds
- C11D1/75—Amino oxides
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/66—Non-ionic compounds
- C11D1/662—Carbohydrates or derivatives
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/66—Non-ionic compounds
- C11D1/825—Mixtures of compounds all of which are non-ionic
Definitions
- the present invention relates to aqueous liquid detergent compositions and to the use of same in the laundering of fabric materials in general and, in particular, to the laundering under relatively mild washing conditions of fine fabric materials such as nylon, polyester, wool, silk, and the like.
- Alkyl glycoside materials such as, for example, higher alkyl monoglycosides and higher alkyl polyglycosides are known materials; are known, at least in certain circumstances, to function as nonionic surfactants; and have been suggested as being suitable for use in certain specially formulated detergent compositions. See in this regard, for example, Published European Patent Application Numbers 0070074; 0070075; 0070076; and 0070077, all of which published on January 19, 1983 as well as Published European Patent Application Numbers 0076994; 0076995; and 0075996 which published on April 6, 1983.
- Patent 4,493,773 (issued January 15, 1985) which discloses laundry detergent compositions which contain a conventional nonionic detergent surfactant, an alkylpolyglycoside detergent surfactant and a quaternary ammonium cationic fabric softening surfactant and which are said to be capable of including a wide variety of conventional laundry detergent additives such as relatively small amounts of detergent builders, detergency co- surfactants such as trialkyl amine oxides, solvents such as ethanol, and the like.
- the various glycoside surfactant-containing laundry detergent compositions suggested to date generally involve the use of said glycoside surfactant in combination with various anionic surfactant materials and/or with various conventional non-glycosidic ethoxylated nonionic surfactant materials and/or in conjunction with one or more of a variety of detergent builder ingredients.
- glycoside surfactant-based detergent compositions can be suitably prepared by properly formulating one or more glycoside surfactants with certain antistatic amine oxide surfactants in the absence of (or at least substantially in the absence of) conventionally employed laundry detergent ingredients such as anionic surfactant ingredients, non-glycosidic ethoxylated nonionic surfactant ingredients and conventional detergent builder materials.
- the present invention in one of its aspects, is a substantially builder-free fine fabric laundry detergent composition, containing less than 10 weight percent of builder ingredients, which comprises, on a total composition weight basis:
- this latter embodiment is essentially a process for laundering soiled fabric materials, said process comprising immersing said fabric material, with at least mild agitation, in a substantially builder-free washing medium comprising, on a total washing medium weight basis, less than 200 parts per million of builder ingredients and from 200 parts per million to 1250 parts per million of a surfactant component consisting of a combination of a glycoside surfactant and the antistatic amine oxide surfactant as defined above, in a glycoside surfactant to amine oxide surfactant weight ratio of from 3:1 to 10:1.
- composition and process of the present invention are especially well suited to and beneficial for the laundering under relatively mild washing conditions (e.g., mild or gentle machine agitation or hand washing and at low or cold wash water temperature) of fine fabric materials such as silk, nylon, polyester and wool.
- relatively mild washing conditions e.g., mild or gentle machine agitation or hand washing and at low or cold wash water temperature
- fine fabric materials such as silk, nylon, polyester and wool.
- the aforementioned antistatic amine oxide surfactant materials provide, at a given usage level of same, substantially more pronounced or enhanced antistatic control within the subject glycoside surfactant-based formulations than they do in comparable compositions wherein conventional ethoxylated alcohol nonionic surfactants are employed in place of said glycoside surfactant component.
- Glycoside surfactants suitable for use in the practice of the present invention include those of the formula: wherein R is a monovalent organic radical (e.g., a monovalent saturated aliphatic, unsaturated aliphatic or aromatic radical such as alkyl, hydroxyalkyl, alkenyl, hydroxyalkenyl, aryl, alkylaryl, hydroxyalkylaryl, arylalkyl, alkenylaryl, arylalkenyl, etc.) containing from 6 to 30 (preferably from 8 to 18 and more preferably from 9 to 13) carbon atoms; R' is a divalent hydrocarbon radical containing from 2 to 4 carbon atoms such as ethylene, propylene or butylene (most preferably the unit (R'O)y represents repeating units of ethylene oxide, propylene oxide and/or random or block combinations thereof); y is a number having an average value of from 0 to 12; Z represents a moiety derived from a reducing saccharide containing 5 or 6 carbon
- Glycoside surfactants suitable for use herein also include those of the Formula A above in which one or more of the normally free (i.e., unreacted hydroxyl groups of the saccharide moiety, Z, have been alkoxylated (preferably, ethoxylated or propoxylated) so as to attach one or more pendant alkoxy or poly (alkoxy) groups in place thereof.
- the amount of alkylene oxide (e.g., ethylene oxide, propylene oxide, etc.) employed will typically range from 1 to 20 (preferably from 3 to 10) moles thereof per mole of saccharide moiety within the Formula A glycoside material.
- the RO(R 1 0)y group is generally bonded or attached to the number 1 carbon atom of the saccharide moiety, Z.
- the free hydroxyls available for alkoxylation are typically those in the number 2, 3, 4 and 6 positions in 6-carbon atom saccharides and those in the number 2, 3 and 4 positions in 5-carbon atom saccharide species.
- the number 2 position hydroxyls in 5-carbon saccharides, and the number 2 and 6 position hydroxyls in 6-carbon saccharides are substantially more reactive or susceptible to alkoxylation than those in the number 3 and 4 positions. Accordingly, alkoxylation will usually occur in the former locations in preference to the latter.
- Glycoside surfactants especially preferred for use herein include those of the Formula A above wherein R is an alkyl group containing from 8 to 18 (especially from 9 to 13) carbon atoms; y is zero; Z is glucose or a moiety derived therefrom; and x has an average value of from 1.5 to 5 (especially from 1.5 to 3).
- Glycoside surfactants of particular interest for use in the practice of the present invention preferably have a hydrophilic-lipophilic balance (HLB) in the range of from 10 to 18 and most preferably in the range of from 12 to 14.
- HLB hydrophilic-lipophilic balance
- amine oxide surfactants suitable for use herein are selected from:
- An especially preferred antistatic amine oxide surfactant for use herein is stearyl dimethyl amine oxide.
- the total amount of surfactant ingredient employed in the compositions hereof is in the range of from 10 to 70 (preferably from 15 to 40 and most preferably from 15 to 30) weight percent on a total composition weight basis.
- said surfactant ingredient consists of a combination of a glycoside surfactant and an antistatic amine oxide surfactant in a glycoside to amine oxide weight ratio of from 3:1 to 10:1 and is preferably from 3:1 to 6:1.
- the water content of the subject detergent compositions is from 30 to 90 weight percent and is preferably from 60 to 85 (and most preferably from 70 to 85) weight percent, said ranges all being stated on a total composition weight basis.
- the surfactant ingredient concentration within the diluted wash water is from 200 to 1250 ppm on a total wash water weight basis.
- the manner in which the detergent compositions hereof are prepared or formulated is not particularly critical and such can be readily accomplished in any convenient fashion as may be desired in a given instance.
- the aforementioned glycoside and amine oxide surfactant ingredients are conveniently prepared, purchased or otherwise obtained in the form of relatively concentrated (e.g., 40 to 80 weight percent active) aqueous solutions of same and it is therefore generally convenient to admix them together (in the desired active ingredient ratios or proportion) in that form and to thereafter dilute the resulting mixture (if and when necessary or desired) with water to the desired total active surfactant ingredient content.
- compositions can optionally (and frequently will desirably) contain relatively minor amounts, typically less than 5 (more typically less than 2 and most typically less than 1) weight percent (total composition weight basis) of the usual types of non-builder, non-surfactant auxiliary ingredients as are commonly or customarily employed in conventional laundry detergent compositions such as, for example, perfumes; optical brighteners; pearlescing agents; colorants; viscosifying agents; and the like.
- compositions hereof are desirably “substantially free” of detergency builder ingredients, it is nonetheless contemplated that relatively minor amounts (i.e., less than 10, preferably less than 5 and most preferably less than 2, weight percent on a total composition weight basis) of builder ingredients such as alkali metal salts of citrates, phosphates, carbonates and the like can nonetheless be included therein without deviating or departing from the scope of the instantly claimed invention.
- a series of fine fabric detergent compositions are prepared by dissolving a C 12 - 13 alkyl polyglucoside surfactant having a degree of polymerization of about 2.5 (APG 23-3) and an amine oxide surfactant, specifically stearyl dimethyl amine oxide, in water and the resulting compositions are then evaluated for cleaning and/or static control effectiveness in the laundering of wool, polyester and nylon fabric materials.
- the total surfactant ingredient content of the compositions prepared and tested is 20 weight percent on a total composition weight basis and the APG:amine oxide ratio employed therein is as shown in Table A below.
- experimental formulations are also prepared and evaluated in which there is employed as the surfactant ingredient: the APG alone; a linear alkyl ethoxylate (LAE) alone (i.e., an ethoxylated C,2_,5 fatty alcohol, 7 moles ethylene oxide per mole fatty alcohol); and the LAE in combination with the amine oxide.
- APG alkyl ethoxylate
- LAE linear alkyl ethoxylate
- the cleaning effectiveness is determined with a Tergotometer apparatus using a 10 minute wash cycle at a water temperature of 85°F (29.4°C) a water hardness of 120 ppm and an agitator speed of 75 rpm.
- the static electricity build-up is quantitatively determined using a Simco O Electrostatic Locator, Model SS2 (Simco is a registered trade mark of Simco Nederland, Lochem (NL)) and is qualitatively evaluated by observing the degree of "static cling" exhibited by the laundered fabric upon removal from the dryer.
- the antistatic amine oxide surfactant provides notably better static control when used in conjunction with the glucoside surfactant than it does when used with the conventional ethoxylated alcohol nonionic surfactant material.
- Examples 1 and 2 The procedure of Examples 1 and 2 is repeated using lauryl dimethyl amine oxide in place of the stearyl dimethyl amine oxide.
- lauryl dimethyl amine oxide needs to be employed at an amine oxide:APG weight ratio in excess of 1:1 (more specifically at a ratio of about 2:1) in order to achieve substantial or acceptable antistatic effectiveness.
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Detergent Compositions (AREA)
Abstract
Claims (8)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US78127285A | 1985-09-26 | 1985-09-26 | |
US781272 | 1985-09-26 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0238635A1 EP0238635A1 (fr) | 1987-09-30 |
EP0238635A4 EP0238635A4 (fr) | 1988-01-07 |
EP0238635B1 true EP0238635B1 (fr) | 1990-10-31 |
Family
ID=25122218
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19860906122 Expired EP0238635B1 (fr) | 1985-09-26 | 1986-09-19 | Composition detergente non ionique pour materiaux textiles fins |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0238635B1 (fr) |
JP (1) | JPS63501642A (fr) |
CA (1) | CA1280664C (fr) |
DE (1) | DE3675383D1 (fr) |
WO (1) | WO1987002051A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2084591T3 (es) * | 1988-08-04 | 1996-05-16 | Kao Corp | Composicion detergente. |
US5230835A (en) * | 1988-08-04 | 1993-07-27 | Kao Corporation | Mild non-irritating alkyl glycoside based detergent compositions |
FR2690709B1 (fr) * | 1992-04-30 | 1997-07-25 | Seppic Sa | Procede d'excavation de tunnels, utilisation d'un agent moussant et nouvel agent moussant. |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3547828A (en) * | 1968-09-03 | 1970-12-15 | Rohm & Haas | Alkyl oligosaccharides and their mixtures with alkyl glucosides and alkanols |
GR76287B (fr) * | 1981-09-28 | 1984-08-04 | Procter & Gamble | |
DE3275202D1 (en) * | 1981-09-28 | 1987-02-26 | Procter & Gamble | Detergent compositions containing mixture of alkylpolysaccharide and amine oxide surfactants and fatty acid soap |
US4483780A (en) * | 1982-04-26 | 1984-11-20 | The Procter & Gamble Company | Detergent compositions containing polyglycoside and polyethoxylate detergent surfactants |
US4483779A (en) * | 1982-04-26 | 1984-11-20 | The Procter & Gamble Company | Detergent compositions comprising polyglycoside and polyethoxylate surfactants and anionic fluorescer |
US4536318A (en) * | 1982-04-26 | 1985-08-20 | The Procter & Gamble Company | Foaming surfactant compositions |
US4493773A (en) * | 1982-05-10 | 1985-01-15 | The Procter & Gamble Company | Low phosphate, softening laundry detergent containing ethoxylated nonionic, alkylpolysaccharide and cationic surfactants |
US4446042A (en) * | 1982-10-18 | 1984-05-01 | The Procter & Gamble Company | Brightener for detergents containing nonionic and cationic surfactants |
US4606850A (en) * | 1985-02-28 | 1986-08-19 | A. E. Staley Manufacturing Company | Hard surface cleaning composition and cleaning method using same |
-
1986
- 1986-09-17 CA CA000518417A patent/CA1280664C/fr not_active Expired - Lifetime
- 1986-09-19 WO PCT/US1986/001959 patent/WO1987002051A1/fr active IP Right Grant
- 1986-09-19 DE DE8686906122T patent/DE3675383D1/de not_active Expired - Fee Related
- 1986-09-19 JP JP50532186A patent/JPS63501642A/ja active Pending
- 1986-09-19 EP EP19860906122 patent/EP0238635B1/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
WO1987002051A1 (fr) | 1987-04-09 |
JPS63501642A (ja) | 1988-06-23 |
EP0238635A4 (fr) | 1988-01-07 |
CA1280664C (fr) | 1991-02-26 |
DE3675383D1 (de) | 1990-12-06 |
EP0238635A1 (fr) | 1987-09-30 |
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