IE58575B1 - Cleaning compositions - Google Patents
Cleaning compositionsInfo
- Publication number
- IE58575B1 IE58575B1 IE114186A IE114186A IE58575B1 IE 58575 B1 IE58575 B1 IE 58575B1 IE 114186 A IE114186 A IE 114186A IE 114186 A IE114186 A IE 114186A IE 58575 B1 IE58575 B1 IE 58575B1
- Authority
- IE
- Ireland
- Prior art keywords
- builder
- soil release
- composition according
- acid
- release polymer
- Prior art date
Links
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
- C11D1/02—Anionic compounds
- C11D1/04—Carboxylic acids or salts thereof
- C11D1/08—Polycarboxylic acids containing no nitrogen or sulfur
-
- 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
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/20—Organic compounds containing oxygen
- C11D3/2075—Carboxylic acids-salts thereof
- C11D3/2082—Polycarboxylic acids-salts thereof
-
- 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
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/37—Polymers
- C11D3/3703—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C11D3/3715—Polyesters or polycarbonates
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)
- Emergency Medicine (AREA)
- Detergent Compositions (AREA)
Abstract
Laundry compositions comprise a mixture of alkoxylated phthalate ester polymers and dicarboxylate detergency builders. The polymers provide a soil release benefit on fabrics and enhance the grease removal preperties of detergent compositions built with dicarboxylate builders.
Description
The subject matter of this invention relates to cleaning compositions which contain alkyl- or alkenyl-carboxy late materials, especially alkyl- or alkenyl-succinates, in combination with polyester soil-release agents, as performance boosting ingredients.
The patent literature describes the use of alkyl- and alkenyl-succinates as surfactants: US 2.283.214;
detergency boosters Patent Specification No. 33650; in various liquid cleaners/GB 1.528.171, US 4.277.378; builders US 2.462.758 and the like. See also US 3.784.486.
A variety of substituted succinates and sulfur-succinates are described for various similar uses; US 3.912.663, US 4.152.515 and US 3.725.286.
The use of various succinates in combination with certain detergency ingredients is also known; see EP 79191 and EP 70190, as well as DE 32 05 791 and DE 33 17 337 or French 2 372 227.
Indeed, the use of carboxylate materials of various types in solid and liquid cleaners is well-known : see GB 1.514.276 for amine soap mixtures; Patent Specification No. 39431 for zeolite/polycarboxylate mixtures: US 2.264.103 for citrate and other carboxylate plus soap mixtures; US 3.634.392 for polysaccharidic carboxylate detergency builders; US 3.898.187 for various sulfur-succinates in dishwashing detergents; and Patent Specification No..37908 for use with clay softeners.
Various polymers have been suggested for use in detergent compositions. Patent Specification No. 3285/87 is an intermediate document and discloses soil release polymers.
There is a continuing search for improved cleaning compositions of all types, and the present invention boosts the performance of such compositions as described more fully hereirafter.
It is a major advantage of the present invention that superior product performance is achieved by the proper, and heretofore unrecognized, combination of various known carboxylate ingredients with effective soil-release polymers.
All percentages, ratios or proportions of ingredients disclosed hereinafter are by weight, unless otherwise specified.
The present invention relates to detergent compositions designed especially for laundering fabrics. Said compositions may be formulated in liquid, solid, or granular form; the liquid form is preferred and such liquid-form compositions are hereinafter referred to as heavy-duty liquids or HDL's, since they are designed to remove even the heaviest soil loads from fabrics when used in a conventional laundering operation.
The fully-formulated laundry compositions herein comprise a conventional alkyl- or alkenyl-dicarboxylate detergency builder (typically 1 % - 35 %; preferably 5 % 20 %) conventional anionic, nonionic, cationic or zwitterionic detersive surfactants (typically 1 % - 35 %; preferably 5 % - 20 %) and, optionally, conventional detersive adjunct and carrier materials, and are characterized in that they contain at least 0.01 %, preferably 0.075 % to 5 %, most preferably 0.1 % to 1.5 %, of a soil-release polymer which is an alkoxylated ester of phthalic acid, as described more fully, hereinafter.
In a method aspect, the invention comprises a method for laundering fabrics by agitating said fabrics in an aqueous laundering liquor, said liquor containing at least 0.05 % by weight of a composition of the foregoing type.
Laundry additive-type products which comprise a mixture of the aforesaid builder and soil-release polymer (generally, at a ratio of 100:1 to 1:100, preferably a ratio of builder to soil-release polymer of at least 5:1) are also contemplated by this invention. Such compositions are designed to be used in combination with conventional, commercial laundry detergents.
The essential components of the present compositions are the di-carboxylate builder and the soil release polymer. The detersive surfactants, optional detersive adjunct ingredients, as well as the carriers, fillers, etc., are all well-known to workers in this field.
The detergent compositions herein are preferably formulated as heavy duty liquids, but may also be formulated in solid forms as flakes, chips, powders, bars or spray-dried granules.
The detergent additive compositions may be in any of the foregoing forms.
Articles which conprise the detergent compositions or the laundry additive compositions releasably-affixed to a sheet substrate or releasably-contained in a sachet or pouch in pre-measured form, suitable for use in an aqueous laundry bath, are also contemplated by this invention.
Dicarboxylate Builder : The preferred builders herein are of the general formula R-CH(COOH)CH2 (COOH) i.e. derivatives of succinic acid, wherein R is C^q-C2q alkyl or alkenyl, preferably ^-^2^167 or where:’-n R be substituted with hydroxyl, sulfo, sulfoxy or sulfone substituents, all as described in the above-mentioned patents.
The succinate builders are preferably used in the form of their water-soluble salts, including the sodium, potassium, ammonium and alkanolammonium salts.
Specific examples of succinate builders include: lauryl succinate, myristyl succinate, palmityl succinate, 2-dodecenyl succinate (preferred), 2-pentadecenyl succinate, and the like.
Soil-Release Polymer : The soil release polymer used herein is of a very special type, and has the generic formula:
O O O 0 <1 1 J* 2 Η 1 H
X- (OCH2CH2) n (O-C-R-C-OR ) (O-C-R -C-O) (CH^l^) n~X in which X can be any suitable capping group, with each X being selected from the group consisting of H, and alkyl or acyl groups containing from 1 to about4 carbon atoms, n is selected for water solubility and generally is from about 6 to about 120, preferably from about 10 to about 50. u is critical to formulation in a liquid detergent having a relatively high ionic strength. There should be very little material in which u is greater than 5. Furthermore there should be at least 20 %, preferably at least 40 % of material in which u ranges from 3 to 5.
Hie R3· moieties are essentially 1,4-phenylene moieties. As used herein, the term the Rx moieties are essentially 1,4-phenylene moieties refers to compounds where the R^ moieties consist entirely of 1,4-phenylene moieties, or are p>artially substituted with other arylene or alkarylene moieties, alkylene moieties, alkenylene moieties, or mixtures thereof. Arylene and alkarylene moieties which can be partially substituted for
1.4- phenylene include 1,3-phenylene, 1,2-phenylene,1.8- naphthylene, 1,4-naphthylene, 2,2-biphenylene,
4.4- biphenylene and mixtures thereof. Alkylene and alkenylene moieties which can be partially substituted include ethylene, 1,2-propylene, 1,4-butylene,
1.5- pentylene, 1,6-hexamethylene, 1,7-heptamethylene,
1.8- octamethylene, 1,4-cyclohexylene, and mixtures thereof.
For the r! moieties, the degree of partial substitution with moieties other than 1,4-phenylene should be such that the soil release properties of the compound are not adversely affected to any great extent. Generally, the degree of partial substitution which can be tolerated will depend upon the backbone length of the compound, i.e., longer backbones can have greater partial substitution for 1,4-phenylene moieties. Usually, compounds where the R^ comprise from about 50 to 100 %
1,4-phenylene moieties (from 0 to about 50 % moieties other than 1,4-phenylene) have adequate soil release activity. For example, polyesters made according to the present invention with a 40:60 mole ratio of isophthalic (1,3-phenylene) to terephthalic (1,4-phenylene) acid have adequate soil release activity. However, because most polyesters used in fiber making comprise ethylene terephthalate units, it is usually desirable to minimize the degree of partial substitution with moieties other than 1,4-phenylene for best soil release activity. Preferably, the R^ moieties consist entirely of (i.e., comprise 100 %) 1,4-phenylene moieties, i.e. each R1 moiety is 1,4-phenylene. (Irrespective of the mechanism of action, it is surprising that the soil release pelymers do show excellent benefits on fabrics other than polyester fabrics and the compositions herein are designed to clean all manner of fabrics and textiles.)
For the R moieties, suitable ethylene or substituted ethylene moieties include ethylene,-1.2- propylene, 1,2-butylene,
1.2- hexylene,3-methoxy-l, 2-propylene and mixtures thereof. Preferably, the R moieties are essentially ethylene moieties, 1,2-propylene moieties or mixtures thereof. Inclusion of a greater percentage of ethylene moieties tends to improve the soil release activity of the compounds. Surprisingly, inclusion of a greater percentage of 1,2-propylene moieties tends to improve the water solubility of the compounds.
For this invention, the use of 1,2-propylene moieties or a similar branched equivalent is essential for incorporation of any substantial part of the soil release component in the heavy duty liquid detergent compositions. Preferably, from about 75 % to about 100 %, more preferably from about 90 % to about 100 % of the R moieties are 1,2-propylene moieties.
The value for each n is at least about 6, but is preferably at least about 10. The value for each n usually ranges from about 12 to about 113. Typically, the value for each n is in the range of from about 12 to about 43.
A preferred process for making the preferred soil release component comprises the step of extracting a polymer having a normal distribution in which a substantial portion comprises a material in which u is greater than 6 with essentially anhydrous ethanol at low temperatures, e.g. from about 10°C to about 15°C. The ethanol soluble fraction is substantially free of the longer polymers and is much easier to formulate into isotropic heavy duty liquids, especially those with higher ionic strengths, e.g. more than about 10 % of the succinate builder.
Although the polymers wherein u is less than about ‘3 are essentially of no value in providing soil release effects, they seem to importantly affect the overall product performance. In particular, the grease-removal performance of compositions containing succinate builders can be sub-optimal; whereas when soil-release polymers are present, this performance is restored to more acceptable levels.
Detersive Surfactants - The detergent compositions of this invention will contain organic surface-active agents (surfactants) to provide the usual cleaning benefits associated with the use of such materials.
Detersive surfactants useful herein include well-known synthetic anionic, nonionic, amphoteric and zwitterionic surfactants. Typical of these are the alkyl benzene sulfonates, alkyl- and alkylether sulfates, paraffin sulfonates, olefin sulfonates, amine oxides, alpha-sulfonates of fatty acids and of fatty acid esters, ethoxylated alcohols and ethoxylated alkyl phenols, and the like, which are well-known from the detergency art. In general, such detersive surfactants contain an alkyl group in the Cg-C-^θ range; the anionic detersive surfactants can be used in the form of their sodium, pjotassium or triethanolammonium salts. Standard texts such as the McCutcheon’s Index contain detailed listings of such typical detersive surfactants. alkyl benzene sulfonates, ^12^18 paraffin-sulfonates and C i -C ί θ alkyl sulfates are especially preferred in the compositions of the present type.
Also useful herein are the water-soluble soaps, e.gi~ the common sodium and potassium coconut or tallow soaps well-known in the art.
The surfactant component can comprise as little as 1 % of the laundry detergent compositions herein, but generally the compositions will contain 5 % to 40 %, preferably 6 % to 30 %, of surfactant. Mixtures of the anionics, such as the alkyl benzene sulfonates, alkyl sulfates and paraffin sulfonates, with Cg-C^ ethoxylated alcohol surfactants are preferred for through-the-wash cleansing of a broad spectrum of soils and stains from fabric.
Detersive Adjuncts - The compositions herein can contain other ingredients which aid in their cleaning performance. For example, it is highly preferred that the laundry compositions herein also contain enzymes to enhance their through-the-wash cleaning performance on a variety of soils and stains. Amylase and protease enzymes suitable for use in detergents are well-known in the art and in commercially available liquid and granular detergents. Commercial detersive enzymes (preferably a mixture of amylase and protease) are typically used at levels of 0.001 % to 2 %, and higher, in the present compositions.
Moreover, the compositions herein can contain, in addition to ingredients already mentioned, various other optional ingredients typically used in commercial products to provide aesthetic or additional product performance benefits. Typical ingredients include pH regulants, perfumes, dyes, bleaches, optical brighteners, soil suspending agents, hydrotropes and gel-control agents, freeze-thaw stabilizers, bactericides, preservatives, suds control agents, bleach activators and the like.
In a through-the-wash laundry mode, the compositions are typically used at a concentration of at least 500 ppm, preferably 0.10 % to 2.c %, in an aqueous laundry bath at pH 7-11 to launder fabrics. The laundering can be carried out by agitating fabrics with the present compositions over the range from 5°C to the boil, with excellent results.
The following examples are typical of the preferred compositions of this invention, but are not intended to limit the scope of the invention.
EXAMPLE I
A preferred HDL is as follows:
Ingredient
2-Dodecenyl Succinate
Soil Release Polymer *
Diethylentr iamine Penta(methylenephosphonate) CaCl2
Formate (Na)
Tr iethanolamine
NaOH **
Ethanol C12 Alkyl Benzene Sulfonate
Coconutalkyl Sulfate
Ethoxylated Cp3_^5 Alcohol (EO7)
Oleic Acid
Enzymes
Water and Minors to
Product pH 7.6
Percent (Wt)
.00
0.50
0.85
0.01
0.9
.00
.6
9.0
.2
3.88
11.6
3.88
0.15
100
7.7 * Prepared by esterifying 1,4 phthalic acid (chloride) with 1,2-propane diol and ethoxylating the polymer with ethylene oxide. The resulting polymer mix is fractionated in cold (15°C) ethanol to provide a cold-ethanol soluble fraction having a u value predominately in the 3 to 5 range. Average ethoxylation value (n) ranges from 12-43.
** Viscosity may be modified by replacing some of the NaOH with KOH, according to the desires of the formulator. A stable homogeneous isotropic product is secured.
It has been discovered that diluting the composition of
Example I with water rapidly reduces its viscosity. This is in direct contrast with many HDL's, whose viscosity increases when water is added. The rapid reduction in viscosity upon addition of water helps the HDL compositions of this invention avoid the problem of dispenser clogging in automatic washing machines or other laundry detergent dispensers.
EXAMPLE II
A laundry additive product is prepared by admixing 15 grams of lauryl succinate with 1 gram of the soil release polymer of Example I. The composition is placed in a flexible polyethylene bag which is sealed along one edge with water-soluble polyvinyl alcohol adhesive. In use, the pouch is simply dropped into an aqueous laundry liquor, together with any conventional laundry detergent, to provide additional builder and soil-release benefits, including the removal of clay and particulate soils from cotton and polyester fabrics.
EXAMPLE III
A granular detergent composition comprises the following ingredients:
Ingredient Percent (Wt)
Alkyl Benzene Sulfonate 8.0
0-^2^13 Alcohol Ethoxy late (EO 6.5) 5.0
Tallow Alcohol Sulfate 3.0
Sodium Perborate (41^0) 19.0
Mixed ^32^14 A^-kenY^ Succinate 20.0
1q Sodium Sulfate 40.0
NaOH/KOH to crutcher pH 10.2
Enzyme Mix * 0.25
Soil Release Polymer ** 0.75
TAED *** 1.0
Water and Minors Balance * Alcalase/Maxatase 1:1 (dry mix) ** Per example I (dry mix) *** Tetraacetyl ethylenediamine (dry mix)
An aqueous crutcher mix is prepared and spray-dried.
The Enzyme Mix, Soil Release Polymer and TAED bleach activator are dry-mixed with the resulting granules.
Claims (9)
1. A laundry detergent composition comprising - conventional detersive surfactants, and; - from 1% to 35% by weight of an alky1-or-alkenyldicarboxylate detergency builder and; - optional conventional detergent adjuncts; characterized in that said composition also contains - at least 0.01% by weight of a soil-release polymer which is a polyethoxylated ester of phthalic acid, in which at least 50% of the phthalic acid is terephthalic acid.
2. A composition according to claim 1 wherein the dicarboxylate builder is a C 12 ~ C 16 alkyl-or-alkenyl succinic-acid or a water-soluble salt thereof.
3. A composition according to claim 2 which comprises 5% to 20% by weight of said succinate material as builder.
4. A composition according to any of the previous claims wherein the soil release polymer is of the formula : O O O 0 X-(OCH_CH_) CO-C-I^-C-OR 2 ) (0-0-^-0-0) (CH CH-O-) -X 2 2 n u z z n wherein R 1 is 1,4-phenylene; R 2 is 1,2-propylene; X is hydrogen? n is an integer of 6 to 120; u is generally an integer of 5 or less, with at least 20%, preferably at least 40% of the material having u ranging from 3 to 5.
5. A liquid detergent according to claim 4.
6. A laundry additive comprising an alkyl-or-alkeny1 dicarbcxylate detergency builder; 5 characterized in that it further - comprises a soil release polymer which is a polyethoxylated ester of phthalic acid in which at least 50% of the phthalic-acid is terephthalic-acid and; 10 - it has a weight ratio of builder : soil release polymer of 100:1 to 1:100
7. A composition according to claim 6 comprising the soil release polymer of claim 4 and the builder of claim 2, at a weight ratio of builder : soil release 15 polymer of at least 5:1.
8. A composition according to claim 1 or 6, releasablycontained in a sachet or pouch, or releasably-affixed to a sheet substrate.
9. A method of laundering fabrics by agitating fabrics 20 with an aqueous bath containing at least 500 ppm of a composition according to any of the foregoing claims.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB858511089A GB8511089D0 (en) | 1985-05-01 | 1985-05-01 | Cleaning compositions |
Publications (2)
Publication Number | Publication Date |
---|---|
IE861141L IE861141L (en) | 1986-11-01 |
IE58575B1 true IE58575B1 (en) | 1993-10-06 |
Family
ID=10578512
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IE114186A IE58575B1 (en) | 1985-05-01 | 1986-04-30 | Cleaning compositions |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0201124B1 (en) |
CA (1) | CA1285449C (en) |
DE (1) | DE3684809D1 (en) |
DK (1) | DK164115C (en) |
FI (1) | FI83232C (en) |
GB (1) | GB8511089D0 (en) |
GR (1) | GR861144B (en) |
IE (1) | IE58575B1 (en) |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0776965A3 (en) | 1995-11-30 | 1999-02-03 | Unilever N.V. | Polymer compositions |
DE19959119A1 (en) | 1999-12-08 | 2001-06-13 | Clariant Gmbh | Emulsions |
GB2385857B (en) * | 2002-02-27 | 2004-04-21 | Reckitt Benckiser Nv | Washing materials |
HUE025312T2 (en) | 2010-04-01 | 2016-02-29 | Unilever Nv | Structuring detergent liquids with hydrogenated castor oil |
EP2495300A1 (en) | 2011-03-04 | 2012-09-05 | Unilever Plc, A Company Registered In England And Wales under company no. 41424 of Unilever House | Structuring detergent liquids with hydrogenated castor oil |
EP2476743B1 (en) | 2011-04-04 | 2013-04-24 | Unilever Plc, A Company Registered In England And Wales under company no. 41424 of Unilever House | Method of laundering fabric |
WO2013139702A1 (en) | 2012-03-21 | 2013-09-26 | Unilever Plc | Laundry detergent particles |
BR112017019942A2 (en) | 2015-04-02 | 2018-06-12 | Unilever Nv | liquid laundry detergent composition and polymer release for dirt release |
WO2017133879A1 (en) | 2016-02-04 | 2017-08-10 | Unilever Plc | Detergent liquid |
EP3469130A1 (en) | 2016-06-09 | 2019-04-17 | Unilever PLC | Laundry products |
US20190136162A1 (en) | 2016-06-09 | 2019-05-09 | Conopco, Inc., D/B/A Unilever | Laundry products |
WO2018127390A1 (en) | 2017-01-06 | 2018-07-12 | Unilever N.V. | Stain removing composition |
BR112019026011A2 (en) | 2017-06-09 | 2020-06-23 | Unilever N.V. | LIQUID DISPENSING SYSTEM FOR TISSUE WASHING AND CONTAINER FOR USE WITH THE DISPENSING SYSTEM |
WO2019038187A1 (en) | 2017-08-24 | 2019-02-28 | Unilever Plc | Improvements relating to fabric cleaning |
WO2019038186A1 (en) | 2017-08-24 | 2019-02-28 | Unilever Plc | Improvements relating to fabric cleaning |
CN111164192B (en) | 2017-09-29 | 2022-08-26 | 联合利华知识产权控股有限公司 | Laundry products |
WO2019068473A1 (en) | 2017-10-05 | 2019-04-11 | Unilever Plc | Laundry products |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1538607A (en) * | 1976-11-26 | 1979-01-24 | Unilever Ltd | Process for manufacture of detergent powders |
DE3585505D1 (en) * | 1984-12-21 | 1992-04-09 | Procter & Gamble | BLOCK POLYESTER AND SIMILAR COMPOUNDS, USED AS A DETOIL REMOVER IN DETERGENT COMPOSITIONS. |
-
1985
- 1985-05-01 GB GB858511089A patent/GB8511089D0/en active Pending
-
1986
- 1986-04-24 DE DE8686200704T patent/DE3684809D1/en not_active Expired - Fee Related
- 1986-04-24 EP EP19860200704 patent/EP0201124B1/en not_active Expired
- 1986-04-29 GR GR861144A patent/GR861144B/en unknown
- 1986-04-30 DK DK198586A patent/DK164115C/en not_active IP Right Cessation
- 1986-04-30 CA CA000508048A patent/CA1285449C/en not_active Expired - Fee Related
- 1986-04-30 IE IE114186A patent/IE58575B1/en not_active IP Right Cessation
- 1986-04-30 FI FI861819A patent/FI83232C/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
DK198586A (en) | 1986-11-02 |
DK164115B (en) | 1992-05-11 |
FI83232B (en) | 1991-02-28 |
DE3684809D1 (en) | 1992-05-21 |
DK164115C (en) | 1992-10-12 |
EP0201124A2 (en) | 1986-11-12 |
IE861141L (en) | 1986-11-01 |
GB8511089D0 (en) | 1985-06-12 |
FI861819A (en) | 1986-11-02 |
EP0201124B1 (en) | 1992-04-15 |
EP0201124A3 (en) | 1989-06-14 |
CA1285449C (en) | 1991-07-02 |
FI861819A0 (en) | 1986-04-30 |
GR861144B (en) | 1986-08-11 |
DK198586D0 (en) | 1986-04-30 |
FI83232C (en) | 1991-06-10 |
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Legal Events
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MM9A | Patent lapsed through non-payment of renewal fee |