RU2437922C2 - Lubricant composition - Google Patents

Abstract

FIELD: chemistry. ^ SUBSTANCE: composition contains the following in wt %: a) one or more phosphoric esters 10-85; b) one or more carboxylic esters 5-60; c) one or more C6-C22 fatty acids, possibly ethoxylated with 1-20 moles of ethylene oxide 0.1-30; and/or d) one or more C6-C22 fatty acids, possibly ethoxoylated with 1-20 moles of ethylene 0.1-30; e) water - up to 100. The lubricant composition is used in form of an aqueous composition diluted 2-10000 times on volume. Lubricant compositions can be used in conveyor systems for glass and/or plastic bottles, such as polyethylene terephthalate (PET) or polycarbonate (PC); tin cans, glass containers, casks, cardboard containers and similar articles. ^ EFFECT: low coefficient of friction for glass, as well as polyethylene terephthalate bottles. ^ 19 cl, 11 tbl, 6 ex

Description

FIELD OF THE INVENTION

The present invention relates to lubricating compositions, wherein the above lubricating compositions are particularly preferred for conveyor systems, especially in the food industry, which are suitable for lubricating, cleaning and disinfecting transport systems. In a more particular case, the invention relates to the use of such compositions as lubricants, especially in conveyor systems for glass and / or plastic bottles, such as polyethylene terephthalate (PET) or polycarbonate (PC) bottles; cans, glass containers, barrels, cardboard containers and the like.

KNOWN LEVEL OF TECHNOLOGY

Typically, bottle and barrel mills of beverage manufacturers and food packaging use articulated flat conveyor belts or other conveying systems. These systems are kept lubricated to reduce the mechanical strength of the bottles and containers and cleaned to remove dirt and avoid contamination by microorganisms, using suitable water-based lubricants, preferably applied with automatic lubrication systems for conveyor belts or other transportation systems equipped with a spray system.

Usually, soap-based lubricants (based on inorganic or organic alkaline salts of a fatty acid or a mixture of fatty acids that contain at least 8 carbon atoms) were used for this purpose.

However, soap-based lubricants have some drawbacks.

- Complexation in hard water, that is, the lubricant must contain appropriate amounts of ethylenediaminotetraacetic or nitrile triacetic acid. This will prevent the formation of calcium salts, which can block the nozzle of the lubrication system.

- For harder water, a greater amount of complexing agent is required in the lubricating compositions, making it necessary to reduce the soap content in the final product. However, this reduces the lubricating effect of the composition.

- Lubricant compositions on a soap basis have a relatively intensive foaming, since it is very difficult to extinguish the soap foam that has already formed. The excess foam produced by the lubricant disappears when the conveyor belts are lubricated and can penetrate into the transported products. On the other hand, foaming on conveyor belts prevents the automatic control of such objects.

- The use of softened water to prevent the formation of calcium soap foam in products in the absence of a complexing agent or with a small amount of this agent increases the cost of using these products.

Ethylenediaminetetraacetic acid (EDTA) is poorly biodegradable with standard biodegradability tests (ASTM or OECD readiness or biodegradability criteria).

Due to these drawbacks, soap-based lubricants are largely replaced by

greases based on fatty amines and / or diamines, or

- phosphorus ester based lubricants.

Moreover, alkyl esters of carboxylic acids or carboxylates have also been used in lubricating compositions for conveyor systems, either directly or in combination with other chemical compounds.

For example, patent EP-A-044458 describes mainly soap-free lubricants adapted for use as conveyor belt lubricants, which consist of:

a) a non-ionic carboxylate compound of the general formula R- [O- (CH ₂ ) _m ] _n -COOM, in which R is a saturated or unsaturated alkyl group, m = 2-3, n = 3-7, and M is H, an alkali metal or alkanolamine cation,

b) an acyl sarcosinate of the general formula RCON (CH ₃ ) CH ₂ COOM, in which R is an C ₁₁ -C ₁₉ alkyl or alkenyl group and M is H, an alkali metal or alkanolamine cation, and

c) water, and possibly a publicly available non-ionic surfactant that shows an HLB value of 10 to 12 to improve the detergent action.

DE-A-4244536 describes lubricating compositions for bottle conveyor belts that contain N-alkyldiamine, a salt thereof obtained by reaction with an organic acid, and possibly an organic acid and a carboxylic acid ester of the formula R- (OC ₂ H ₄ ) _x O (CH ₂ ) _y COOH in which R is a C ₁₀ -C ₂₀ alkyl group (preferably C ₁₆ -C ₁₈ ), x = 1-20 (preferably 5-15) and finally y = 0-5 (preferably 1 )

DE-A-19642598 describes an amine based lubricant concentrate for conveyor belts in the food industry, including: i) one or more amines, ii) one or more carboxylic acid esters, iii) one or more polyethylene glycols, and iv) up to 99 % by weight of conventional additives and activators. The carboxylic acid esters described are compounds of the general formula R- (O (CH ₂ ) _m ) _n OCH ₂ COO ^- M ⁺ , in which R is selected from the group consisting of a saturated unbranched or branched C ₁ -C ₂₂ alkyl residue, mono or polyunsaturated a linear or branched, alkenyl or alkynyl radical having from 2 to 22 carbon atoms in a chain, and a mono or poly C ₁ -C ₂₂ alkyl or C ₂ -C ₂₂ alkenyl or alkenyl substituted aryl radical; m is 2 or 3; n is a positive number from 1 to 30, and M is hydrogen or an alkali metal.

US-A-5062979 describes an optically pure, water-based lubricant composition, substantially free of soap, having a pH in the range of 6 to 8, including water and:

(a) from 0.02 to 15% by weight of the total composition of alkylbenzenesulfonate molecules containing 10-18 carbon atoms in the alkyl part and having cations selected from the group consisting of alkali metal ions, ammonium ions and alkanolammonium ions containing from 1 to 14 carbon atoms in the alkanolamine moiety;

(b) from 0.02 to 15% by weight of the total composition of a partially esterified phosphonic acid or phosphate molecules of the corresponding general formula R ₁ - (O (CH ₂ —CH (R ₂ ) —O) _n —PO ₃ X, in which R ₁ is selected from the group consisting of aliphatic monovalent hydrocarbon radicals containing from about 12 to 18 carbon atoms, R ₂ is H or CH ₃ , X is hydrogen or an alkali metal, and n is an integer in the range of 8 to 12, and

(c) from 0.01 to 10% by weight of the total composition of molecules selected from the group consisting of aliphatic carboxylic acids containing from 6 to 22 carbon atoms and having a titer of not more than 20 ° C; and at will

(d) commonly used solubilizers, solvents, foam inhibitors, disinfectants or mixtures thereof, wherein component (a) and component (b) are present in a weight ratio of 3: 1 to 1: 3, and component (c) is present in a weight ratio to the sum of components (a) and (b) from 1:20 to 1: 4.

DE-A-19846991 describes a lubricant for conveyor and transport system chains, including water, a surfactant selected from the group consisting of:

a) a monoalkyl-polyalkylene glycolic carboxylic acid ester of the following formula R ₁ (OC ₂ H ₄ ) _m (OC ₃ H ₅ ) _n O- (CH ₂ ) _p CHR ₂ C (O) OR ₃ in which R ₁ is saturated straight or branched C ₁ -C ₁₂ -alkyl radical, mono- or polyunsaturated unbranched or branched alkenyl or alkynyl radical having from 2 to 22 carbon atoms, or an aryl radical, possibly substituted once or several times by C ₁ -C ₂₂ -alkyl or alkenyl or alkynyl groups; m denotes a number in the range from 0 to 30; n denotes a number in the range from 0 to 30; p denotes a number in the range from 0 to 4; R ₂ is a hydroxyl group or hydrogen and R ₃ is hydrogen, a methyl group or an alkali metal;

b) alkylbenzenesulfonic acid or one of its salts of the following general formula R ₄ -C ₆ H ₆ -SO ₃ M (II), in which R ₄ is an unbranched or branched C ₁ -C ₂₂ alkyl radical or a mono- or polyunsaturated unbranched or branched an alkenyl or alkynyl radical having from 2 to 22 carbon atoms, and M is hydrogen or an alkali metal;

c) a monoalkyl-polyalkylene glycol mono- or phosphoric acid diester of the general formula (R ₅ - (OC ₂ H ₄ ) _q - (OC ₃ H ₅ ) _r -O) _s -PO ₂ R ₆ H, in which R ₅ is a straight, saturated, unbranched or a branched C ₁ -C ₂₂ alkyl radical or a mono- or polyunsaturated unbranched or branched alkenyl or alkynyl radical having from 2 to 22 carbon atoms, or an aryl radical optionally substituted once or several times by C ₁ -C ₂₂ alkyl or alkenyl, or alkynyl groups; q denotes a number in the range from 0 to 30; r denotes a number in the range from 0 to 30; s denotes a number in the range from 0 to 2; R ₆ denotes a hydroxyl group, if s is 1, and if s is 2, then R _{6 is} absent; and

d) mixtures thereof;

and disinfecting agents, as well as activators and filler materials, in which the aforementioned disinfecting agent contains chlorine dioxide.

Patent ES-A-2206052 describes the use as a lubricant of carboxylic acid esters of the formula R- (OCH ₂ CH ₂ ) _n O-CH ₂ COOX, in which R is an alkyl, alkenyl or alkynyl residue containing from 12 to 22 carbon atoms; n is a number from 0.3 to 15, and X is hydrogen, an alkali metal, an ammonium cation or a hydroxyalkylammonium cation.

According to ES-A-2206052, the described carboxylic acid esters can in particular be used in conveyor systems.

Patent EP-A-1652909 describes agents that inhibit corrosion of functional fluids, which are fluids used as lubricants, abrasives, coolants for the metal industry, in particular hydraulic fluids (HF or HFA). EP-A-1652909 describes in tables 1-3 concentrates miscible with water, which can be used as corrosion inhibitors. Thus, example 3 and comparative example C EP-A-1652909 describes concentrates miscible with water, including polyglycol ether of fatty alcohols (3.6% by weight), oleyl ether (5 EO) of carboxylic acid (1.8% by weight ), tallow oil fatty acid (0.8% by weight) and 2-ethylhexylphosphoric acid (2.0% by weight). Although these compositions may exhibit the properties of lubricants, the discovery of the polyglycolic ester of fatty alcohols does not reveal a C ₆ -C ₂₂ fatty alcohol, possibly ethoxylated with 1-20 moles of ethylene oxide, as claimed in the present invention.

US-A-4895668 describes a water-based lubricant composition that contains one or more carboxylated surfactants and one or more non-carboxylated surfactants in combination with a soap lubricant. Table 2 of US-A-4895668 describes lubricating compositions containing nonylphenol ethoxylated with 9 molecules of ethylene oxide (5.0% by weight), sodium oleyl ether (5 EO) of carboxylic acid (5.5% by weight), tall oil fatty acid (20.0% by weight). US-A-4895668 failed to disclose the phosphoric acid esters of the present invention. Moreover, the disclosure of ethoxylated nonylphenol does not imply a C ₆ -C ₂₂ fatty alcohol, optionally ethoxylated with 1-20 moles of ethylene oxide, as claimed in this patent application. As a result, the lubricating properties of the compositions described in US-A-4895668 are not suitable for glass bottles or PET bottles.

Fatty amines and / or diamines are chemicals that pose a hazard to the environment. In order to protect the environment and human health, chemical compounds are tested and classified according to their potential hazard. An important criterion is the classification by hazard class, regarding water pollution, of the German Federal Environment Agency (Umweltbundesamt). Three hazard classes of substances for water pollution (WGK) are defined.

1. Low hazard substances for water pollution.

2. Hazardous substances for water pollution.

3. Extremely hazardous substances for water pollution.

One of the most widely used diamine conveyor systems, oleyl diamine (N-oleyl-1,3-diaminopropane) has been classified as a chemical compound extremely dangerous for water contamination (hazard class 3 for water contamination).

Phosphoric esters, on the other hand, exhibit stability problems (2-phase formation) when they are obtained by dilution from a concentrated composition and they are sensitive to water hardness. Moreover, phosphoric acid esters alone do not show significant lubricity in conveyor systems for plastic bottles such as polyethylene terephthalate (PET) or polycarbonate (PC).

It can be concluded on the basis of the existing prior art that the industry still needs improvements in the field of lubricant compositions for conveyor systems that do not contain fatty amines and / or diamines that could be obtained by dilution from a concentrated composition without problems with stability, which would not depend on the hardness of the water and which could be applied to other materials (glass, PET, cans, etc.), being more universal.

SUMMARY OF THE INVENTION

The present invention provides an effective solution to the problems encountered in the prior art by providing a lubricating composition containing the following elements:

a) one or more esters of phosphoric acid of the formula (I) in which

R ¹ is an unbranched or branched, saturated or unsaturated C ₆ -C ₂₂ alkyl or alkenyl group, or R ³ (OCH ₂ CH ₂ ) _m group;

- R ² denotes hydrogen, a straight or branched, saturated or unsaturated C ₆ -C ₂₂ alkyl or alkenyl group, or R ³ (OCH ₂ CH ₂ ) _m group;

- R ³ represents hydrogen or a straight or branched, saturated or unsaturated C ₆ -C ₂₂ alkyl or alkenyl group;

- m is a number from 1 to 15; and

- z is hydrogen or a suitable cation;

b) one or more esters of carboxylic acids of the formula (II) in which

RO- (CH ₂ CH ₂ O) _n -CH ₂ COOM (Ii)

- R is an unbranched or branched, saturated or unsaturated C ₆ -C ₂₂ alkyl or alkenyl group;

- n denotes a number from 0.5 to 20; and

- M is hydrogen or a suitable cation selected from the group consisting of alkali metal, alkaline earth metal, ammonium, alkylammonium, alkanolammonium or glucammonium; and

c) one or more C ₆ -C ₂₂ fatty acids, possibly ethoxylated with 1-20 moles of ethylene oxide; and / or

d) one or more C ₆ -C ₂₂ fatty alcohols, possibly ethoxylated with 1-20 moles of ethylene oxide;

e) water; and

in which the mass ratio of component (a) to component (b) is in the range from 9: 1 to 1: 3, preferably in the range from 5: 1 to 1: 3, more preferably in the range from 2: 1 to 1: 2.

The object of the present invention not only includes concentrated water-based lubricating compositions, but also diluted water-based lubricating compositions obtained by diluting existing lubricating compositions.

The present invention also provides a method for lubricating conveyor systems, comprising applying the diluted water-based lubricant composition in accordance with the invention to the conveyor system continuously or at intervals.

The present invention also provides the use of lubricant compositions for lubricating conveyor systems.

DETAILED DESCRIPTION OF THE INVENTION

Phosphoric esters

Phosphoric esters according to the present invention can be obtained by reacting C ₆ -C ₂₂ fatty alcohols with phosphorus pentoxide (P ₂ O ₅ ) in an aqueous medium.

C ₆ -C ₂₂ fatty alcohols are preferably derived from natural fat and oil, as well as from a synthetic source. Preferred fats and oils include palm oil, coconut oil, sunflower oil, rapeseed oil, castor oil, olive oil, soybean oil; and animal fat, such as tallow, bone oil, fish oil, and their solidified fats, semi-solidified fats; and mixtures thereof. Due to its natural origin, C ₆ -C ₂₂ fatty alcohols that react with phosphorus pentoxide (P ₂ O ₅ ) can contain a wide variety of alkyl and / or alkenyl groups, the above groups being branched or unbranched, saturated or unsaturated.

Particularly preferred are C ₆ -C ₂₂ fatty alcohols derived from coconut oil, palm oil or olive oil. It is particularly preferred that the C ₆ -C ₂₂ fatty alcohols react with phosphoric acid esters derived from olive oil.

The phosphoric acid esters obtained by the reaction of C ₆ -C ₂₂ fatty alcohols with phosphorus pentoxide (P ₂ O ₅ ) are a mixture of phosphoric monoesters (monoalkyl ethers) and phosphoric diesters (dialkyl ethers), and the resulting products and reaction are well known to those skilled in the art (O'Lenick et al., Soap Cosmetics and Chemical Specialties, July 1986, p. 26)

In accordance with the present invention, it is preferable that the weight ratio of phosphoric monoesters to phosphoric diesters is from 50:50 to 95: 5, more preferably from 55:45 to 90:10.

According to the present invention, in the formula of phosphoric acid esters (I) Z represents hydrogen or a corresponding cation, wherein the above cation is preferably selected from the group consisting of alkali metal, alkaline earth metal, ammonium, alkylammonium, alkanolammonium or glucammonium. Most preferably, Z is hydrogen or an alkali metal, preferably lithium, sodium or potassium.

In accordance with the present invention, it is also preferable that the C ₁₆ -C ₁₈ proportion in the alkyl and / or alkenyl groups of phosphoric acid esters is higher than 70%, preferably higher than 80%, and most preferably higher than 85%.

If desired, C ₆ -C ₂₂ fatty alcohols are ethoxylated having an average degree of ethoxylation from 1 to 10, preferably from 2 to 8.

Examples of commercially available phosphoric acid esters are FOSFODET ^® 20 M (potassium salt of phosphoric ester of lauric alcohol, ratio of monoester to diester 80:20); FOSFODET ^® 20 D (potassium salt of phosphoric ester of lauric alcohol, the ratio of monoester to diester 50:50); FOSFODET ^® 8050 (phosphoric ester of hydrogenated tall oil, the ratio of monoester to diester 60:40); FOSFODET ^® FJZ 903 (ethoxylated (3 EO) phosphate ester of oleyl alcohol, 55:45 ratio of monoester to diester), all are available on the KAO Chemicals Europe market.

Esters of carboxylic acids

The carboxylic esters of formula (II) are products well known in the art. They are usually prepared by alkoxylation and subsequent carboxymethylation of fatty alcohols, as described by Meijer and Smid in Polyether Carboxylates; Anionic Surfactants; Surfactant Sciencie Series, Vol. 56 (p. 313-361), edited by Helmut W. Stache, ISBN: 0-8247-9394-3.

The process is divided into two stages. The first step is the alkoxylation of alcohols under standard conditions known to those skilled in the art. For example, a polyoxyethylene group is obtained by adding ethylene oxide to fatty alcohols, in most cases with an alkaline catalyst such as NaOH, KOH or NaOCH ₃ , giving a wide distribution of polyoxyethylene oxide (wide degree of ethoxylation). For special applications, ethoxylation can be catalyzed by Lewis acids or by using metallic Na or NaH to achieve a narrow distribution spectrum (narrow degree of ethoxylation).

However, the process can also be started with commercially available ethoxylated alcohols.

In a second step, ethoxylated alcohols are reacted with a strong base, such as sodium or potassium hydroxide, in the presence of a reducing agent, for example sodium borohydride, to give the corresponding alkoxylate, which is carboxymethylated with sodium monochloracetate (SMCA).

Esters of carboxylic acids of formula (II) are obtained from C ₆ -C ₂₂ fatty alcohols, which are preferably obtained from natural fat and oil, as well as from a synthetic source. Preferred fats and oils include palm oil, coconut oil, sunflower oil, rapeseed oil, castor oil, olive oil, soybean oil; and animal fat, such as tallow, bone oil, fish oil, and their solidified fats, semi-solidified fats; and mixtures thereof. Due to its natural origin, C ₆ -C ₂₂ fatty alcohols that are alkoxylated and subsequently carboxymethylated can contain a wide variety of alkyl and / or alkenyl groups, the above groups being branched or unbranched, saturated or unsaturated.

Particularly preferred are C ₆ -C ₂₂ fatty alcohols derived from coconut oil, palm oil or olive oil. It is particularly preferred that the C ₆ -C ₂₂ fatty alcohols react with phosphoric acid esters derived from olive oil.

Particularly preferred are C ₆ -C ₂₂ fatty alcohols derived from coconut oil, palm oil or olive oil. It is particularly preferred that C ₆ -C ₂₂ fatty alcohols that are alkoxylated and subsequently carboxymethylated are obtained from olive oil.

In accordance with the present invention, it is preferable that in formula (II) of carboxylic acid esters n is in the range of 1 to 10, preferably in the range of 1 to 7, and M is hydrogen, sodium or potassium.

Moreover, it is also preferred that in the C ₁₆ -C ₁₈ alkyl and / or alkenyl group in the carboxylic acid esters of the formula (II) C ₁₆ -C _{18 the} proportion is higher than 80%, more preferably higher than 80%, and most preferably higher 85%

Examples of commercially available esters of carboxylic acids of formula (II) are AKYPO ^® RO 10 VG (oleyl ether carboxylic acid having an average degree of ethoxylation of one); AKYPO ^® RO 20 VG (carboxylic acid oleyl ester with an average degree of ethoxylation of 2); AKYPO ^® RO 50 VG (carboxylic acid oleyl ester with an average degree of ethoxylation of 5) and AKYPO ^® RO 90 VG (carboxylic acid oleyl ester with an average degree of ethoxylation of 9) are all available on the KAO Chemicals Europe market.

Fatty acid

In accordance with the present invention, C ₆ -C ₂₂ fatty acids can be selected from a natural and / or synthetic source. Accordingly, natural fatty acids can also be used in addition to synthetic fatty acids. Naturally, natural acids are not found in pure form and, therefore, are preferably used for the purposes of the present invention in the form of mixtures that can be obtained from various natural sources. Accordingly, fatty acids are preferably selected from caproic acid, enanthic acid, caprylic acid, pelargonic acid, 9-hexadecenoic acid, 9,12-octadecadienoic acid, 9,12,15-octadecatrienoic acid, 5,8,11,14-eicosatetraenoic acids, 4,8,12,15,19-docosapentaenoic acid, spermaceti acid acid, coconut oil acid, oleic acid, melt oil acid, sunflower oil acid, linseed oil acid and / or canola oil.

C ₆ -C ₂₂ fatty acids are optionally ethoxylated with 1-20 moles of ethylene oxide, preferably 1-10 moles of ethylene oxide.

Preferably, the C ₁₆ -C ₁₈ proportion in the fatty acids of the present invention is higher than 70%, preferably higher than 80%, most preferably higher than 85%.

Fatty alcohols

Fatty alcohols are aliphatic alcohols derived from natural fats and oils. Due to their aliphatic nature, fatty alcohols behave like non-ionic surfactants. They find application as emulsifiers, emollients and thickeners in the cosmetic and food industries.

Fatty alcohols are a well-known component of wax, in most cases in the form of esters of fatty acids, but also directly in the form of alcohols.

Examples of C ₆ -C ₂₂ fatty alcohols include caprylic alcohol (1-octanol), pelargonol (1-nonanol), capric alcohol (1-decanol), lauryl alcohol (1-dodecanol), myristyl alcohol (1-tetradecanol), cetyl alcohol alcohol (1-hexadecanol), palmitoleyl alcohol (cis-9-hexadecan-1-ol), stearyl alcohol (1-octadecanol), isostearyl alcohol (16-methylheptadecan-1-ol), elaidyl alcohol (9E-octadecene-1- ol), oleyl alcohol (cis-9-octadecene-1-ol), linoleyl alcohol (9E, 12Z-octadecadien-1-ol), elaidolinoleyl alcohol (9E, 12E-octadecadien-1-ol), linolenyl alcohol (9Z, 12Z, 1 5Z-octadecatrien-1-ol), elaidolinolenyl alcohol (9E, 12E, 15E-octadecatrien-1-ol), ricinoleyl alcohol (12-hydroxy-9-octadecene-1-ol), arachidyl alcohol (1-neucosanol), behenyl alcohol (1-dososanol) and erucil alcohol (cis-13-docosen-1-ol).

C ₆ -C ₂₂ fatty alcohols are optionally ethoxylated with 1-20 moles of ethylene oxide, preferably 1-10 moles of ethylene oxide.

Preferably, the C ₁₆ -C ₁₈ proportion in the fatty acids of the present invention is higher than 70%, preferably higher than 80%, most preferably higher than 85%.

Lubricant composition

Preferably, the lubricating composition in accordance with the present invention contains the following elements,

a) one or more phosphoric acid esters of the formula (I) in which

- R ¹ denotes a straight or branched, saturated or unsaturated C ₆ -C ₂₂ alkyl or alkenyl group, or R ³ (OCH ₂ CH ₂ ) _m group;

- R ² is hydrogen, a straight or branched, saturated or unsaturated C ₆ -C ₂₂ alkyl or alkenyl group, or R ³ (OCH ₂ CH ₂ ) _m group;

- R ³ is hydrogen or a straight or branched, saturated or unsaturated C ₆ -C ₂₂ alkyl or alkenyl group;

- m is a number from 1 to 15; and

- z is hydrogen or a suitable cation;

b) one or more esters of carboxylic acids of the formula (II) in which

RO- (CH ₂ CH ₂ O) _n -CH ₂ COOM (Ii)

- R is an unbranched or branched, saturated or unsaturated C ₆ -C ₂₂ alkyl or alkenyl group;

- n denotes a number from 0.5 to 20; and

- M is hydrogen or a suitable cation selected from the group consisting of alkali metal, alkaline earth metal, ammonium, alkylammonium, alkanolammonium or glucammonium; and

c) one or more C ₆ -C ₂₂ fatty acids, possibly ethoxylated with 1-20 moles of ethylene oxide; and / or

d) one or more C ₆ -C ₂₂ fatty alcohols, possibly ethoxylated with 1-20 moles of ethylene oxide;

e) water; and

in which the mass ratio of component (a) to component (b) is in the range from 9: 1 to 1: 3, preferably in the range from 5: 1 to 1: 3, more preferably in the range from 2: 1 to 1: 2.

An object of the present invention also includes a concentrated water-based lubricating composition comprising, expressed in weight percent:

a) 10-85% phosphoric acid esters of the formula (I),

b) 5-60% of carboxylic acid esters of the formula (II),

c) 0.1-30% fatty acids,

d) 0.1-30% fatty alcohols,

e) water added to 100%.

In accordance with the present invention, it is preferred that the carboxylic acid esters of formula (II) are mixtures of a water-based lubricant composition

I) C ₆ -C ₁₀ alkyl and / or alkenyl esters of carboxylic acids having an average degree of ethoxylation from 2 to 8

II) C ₁₂ -C ₁₈ alkyl and / or alkenyl esters of carboxylic acids having an average degree of ethoxylation from 1 to 10, preferably from 1 to 7.

Most preferably, the concentrated lubricant water-based composition in accordance with the present invention contains, expressed in weight percent:

a) 15-55% phosphoric acid esters of the formula (I),

b ₁ ) 5-20% C ₆ -C ₁₀ alkyl and / or alkenyl esters of carboxylic acids having an average degree of ethoxylation from 2 to 8,

b ₂ ) 10-45% C ₁₂ -C ₁₈ alkyl and / or alkenyl esters of carboxylic acids having an average degree of ethoxylation from 1 to 10,

c) 1-20% fatty acids,

d) 1-20% fatty alcohols,

e) water added to 100%.

Preferably, the weight ratio of C ₁₂ -C ₁₈ alkyl and / or alkenyl esters of carboxylic acids to C ₆ -C ₁₀ alkyl and / or alkenyl esters of carboxylic acids in the aqueous lubricant concentrated composition in accordance with the present invention is in the range of 8 : 1 to 1: 5, preferably in the range of 5: 1 to 1: 2.

The active substance content of the concentrated aqueous lubricant composition in accordance with the present invention is preferably at least 30% by weight, more preferably at least 50% by weight, most preferably at least 65% by weight, the active substance of the composition is significant degree is provided by components (a), (b), (c) and (d).

According to the present invention, a water-based lubricant diluted composition can be obtained by diluting a water-based lubricant concentrated composition, as described previously, from 2 to 10,000 times by volume, preferably from 5 to 1000 times. The above dilution can be performed directly in the first stage or through intermediate partially diluted compositions, that is, starting from the concentrate, diluting it from 2 to 100 times and, ultimately, diluting it again to the desired final concentration. This procedure is widely used because it avoids the transportation and storage of highly diluted compositions.

Water-based lubricant compositions are usually applied in a very dilute form such that the concentration of the active substance deposited on the conveyor systems is in the range of 0.01% to 2% by weight. The total content of active substance (largely represented by components (a), (b), (c) and (d)) in the lubricated diluted composition is in the range from 0.01 to 1%, preferably from 0.02 to 0.5 % by weight. Dilution of the concentrated lubricating composition to obtain diluted lubricating compositions, those that are directly applied to conveyor systems, can be performed with hard water, semi-hard water or soft water.

The water-based lubricant compositions of the present invention may also contain additives such as ionic surfactants, nonionic surfactants, amphoteric surfactants, foaming inhibitors, foaming regulators, foaming stabilizers, complexing agents, chelating agents agents, solubilizers, emulsifiers, biocides, bactericides, disinfectants, fungicides, antioxidants, corrosion inhibitors and pH regulators, or in the form of mazochnyh concentrated compositions on aqueous basis or in the form of diluted lubricating composition on a water basis.

The pH level of these water-based lubricant compositions for conveyor systems is preferably between 6.0 and 8.5, more preferably between 6.5 and 8.0.

The viscosity of the concentrated aqueous lubricant compositions of the present invention is in the range of 50 to 20,000 mPa · s at 20 ° C., more preferably from 100 to 10,000 mPa · s at 20 ° C.

When the lubricated concentrated water-based composition of the present invention was partially diluted to obtain a partially diluted composition, for example, in the range of 8 to 10% by weight, the viscosity of the above partially diluted composition was in the range of 100 to 6000 mPa · s at 20 ° C. and preferably less than 1000 MPa · s at 20 ° C.

The lubricated diluted water-based composition of the present invention has a viscosity equivalent to or similar to the viscosity of water at 20 ° C.

As solubilizers, the compositions of the present invention may contain solubilizers that can be mixed with water or dissolved in water. The preferred solubilizers are urea, ethanol, n-propanol, i-propanol, n-butanol, ethylene glycol and / or butyldiglycol, propylene glycol, polyethylene glycol, lower or higher molecular weight polyethylene glycols [HO- (CH ₂ -CH ₂ - O) _n -H] such as PEG-150, PEG-300, PEG-500, PEG-2000, PEG-3500 or PEG-8000, methoxypolyethylene glycols [CH ₃ O- (CH ₂ -CH ₂ -O) _n - H] having an average molecular weight in the range of 150 to 5000, such as MPEG-350, MPEG-500, MPEG-750, MPEG-1000, MPEG-2000, MPEG-3000 or MPEG-5000, vegetable oils, mixtures of alkoxylated glycerides derived from carbon acids containing from 6 to 22 carbons and alkoxylated glycerol, such as those commercially available under the brand name LEVENOL ^® and marketed by KAO Chemicals Europe, alkylated, preferably ethoxylated glycerol, etc., in an amount corresponding to 10 -40% by weight of one or more of these solubilizers, relative to 100 parts by weight of the total amount of compounds a), b), c) and d). Such solubilizers are suitable, in the context of the present invention, provided that they do not reduce the lubricating effect of the water-based lubricating composition.

Disinfectants that may be contained in water-based lubricant compositions for conveyor systems are, for example, those described in Guia de Plaguicidas utilizados en Higiene Alimentaria y Salud Publica, published by the Ministry of Health of Spain (ISBN: 84-7607-499 -2). Preferably, in accordance with the present invention, disinfectants should be used when there is a risk of the presence of microorganisms in reserve containers or on conveyor systems. These disinfectants or mixtures thereof can be used in amounts of 5 to 50 parts by weight, relative to 100 parts by weight of the total amount of compounds a), b), c) and d). A preferred disinfectant in accordance with the present invention is chlorine dioxide (ClO ₂ ).

An object of the present invention also includes a method for lubricating conveyor systems, comprising applying a diluted water-based lubricant composition of the invention to the conveyor system continuously or at intervals.

Conveyor systems that can be lubricated by the method of this invention can be systems for glass bottles, plastic bottles such as polyethylene terephthalate (PET) or polycarbonate (PC) bottles, cans, glass containers, barrels, cardboard containers and the like. Preferably, the systems are suitable for glass bottles, polyethylene terephthalate (PET) bottles and cans.

The subject of the present invention also includes the use of a diluted water-based lubricant composition according to the invention for lubricating conveyor systems. The above systems can be systems for glass bottles, plastic bottles such as polyethylene terephthalate (PET) or polycarbonate (PC) bottles, cans, glass containers, barrels, cardboard containers and the like. Preferably, the systems are suitable for glass bottles, polyethylene terephthalate (PET) bottles and cans.

The following examples are given in order to provide those skilled in the art with a sufficiently clear and complete explanation of the present invention, but should not be construed as limiting the essential aspects of this subject matter as described in the previous parts of this description.

EXAMPLES

Example 1. Water-based lubricant compositions

The following water-based lubricant compositions were obtained. Values are presented in weight percent.

Table 1 Lubricating compositions of the present invention (components as active substances) one 2 3 four 5 6 Polyoxyethylene (3) oleyl phosphate ester ¹ 72.7 54.1 36.1 32.8 29.5 42,4 Polyoxyethylene (2) carboxylic acid oleyl ester ² 10,4 22.0 33.7 30.7 27.6 39.6 Polyoxyethylene (5) carboxylic acid oleyl ester ³ 8.4 6.3 4.2 3.8 3.4 4.9 Polyoxyethylene (8) Caprylic ester of carboxylic acid ⁴ --- --- --- 8.4 16.7 --- Oleic acid 4.6 9.7 14.8 13,4 12.1 --- Oleyl ether 2.7 5.8 8.8 8.1 7.3 10.3 Deionized water 1.8 2.1 2,4 2.9 3.4 2,8 ¹ Phosphate ester of ethoxylated (3 EO) oleyl alcohol, the ratio of monoester to diester 55:45
² Carboxylic acid oleic ester with an average degree of ethoxylation 2
³ Carboxylic acid oleic ester with an average degree of ethoxylation 5
⁴ Carboxylic ester of carboxylic acid with an average degree of ethoxylation 8

table 2 Comparative experiments (components as active substances) C1 C2 C3 Polyoxyethylene (3) oleyl phosphate ester ¹ 36.1 99.3 --- Oleic acid 14.8 --- --- Oleyl alcohol 8.8 --- --- Polyoxyethylene (2) carboxylic acid oleyl ester ² --- --- 95.0 Sodium dodecylbenzenesulfonate ³ 37.9 --- --- Deionized water 2,4 0.7 5,0 ¹ Phosphate ester of ethoxylated (3 EO) oleyl alcohol, the ratio of monoester to diester 55:45
² Carboxylic acid oleic ester with an average degree of ethoxylation 1
³ As described in US-A-5062979

Example 2. Lubrication in conveyor systems for glass bottles

Tests for measuring friction resistance were carried out on a stainless steel bottle conveyor belt under the following conditions:

- resistance measurement of 7 Ale beer bottles of 0.5 L each filled with water, a tensile tester was used as a tensile force. These bottles were placed in a plastic beer crate, which allowed them to rotate on a conveyor belt, but did not allow them to tip over.

- bottle speed: approximately 0.5 m / s.

- continuous irrigation of a bottle conveyor belt with a lubricant solution of 0.03% by weight.

- nozzle irrigation volume: approximately 3.5 l / h.

The dynamic coefficient of friction (µ) was defined as the coefficient between the tensile force measured for a bottle and the weight of this bottle, expressed in grams. This coefficient was determined when a constant value was obtained.

Foam formation was observed visually. The compositions of the present invention did not foam or show slight foaming.

Dilution of the lubricating compositions of the present invention (Table 1, Example 1), as well as comparative experiments (Table 2, Example 1), were performed using tap water from Emmerich am Rhein (Germany), in particular with a hardness of 17 dH (German degrees), in accordance with UNE-EN 12829 standard.

Table 3 shows the friction coefficients obtained for the lubricating compositions described in table 1 and table 2 of example 1.

Table 3 Coefficients of friction for glass bottles (µ) Lubricating compositions µ one 0.10 2 0.11 3 0.12 four 0.10 5 0.10 6 0.13 C1 0.16 C2 0.13 C3 0.16 C4 * 0.17 * Commercial product based on:
- N-oleyl-1,3-diaminopropane,
- With ₁₃ branched alcohol with an average degree of ethoxylation of 8,
- acetic acid and
- carboxylic acid oleic ester with an average degree of ethoxylation of 9

Example 3. Lubrication in conveyor systems for PET bottles

Tests for measuring friction resistance were carried out on a stainless steel bottle conveyor belt under the following conditions:

- measuring the resistance of 6 PET bottles of the Weiße Brunnen-Einheitsflaschen 0.5 L type each (Rostiprimpac) filled with water, a tensile tester was used as a tensile force. These bottles were placed in a steel frame for PET bottles, which allowed them to rotate on a conveyor belt, but prevented them from tipping over;

- bottle speed: approximately 0.5 m / s;

- continuous irrigation of a bottle conveyor belt with a lubricant solution of 0.03% by weight;

- nozzle irrigation volume: approximately 3.5 l / h.

The dynamic coefficient of friction (µ) was defined as the coefficient between the tensile force measured for a bottle and the weight of this bottle, expressed in grams. This coefficient was determined when a constant value was obtained.

Foam formation was observed visually. The compositions of the present invention did not foam or show slight foaming.

Dilution of the lubricating compositions of the present invention (Table 1, Example 1), as well as comparative experiments (Table 2, Example 1), was performed with tap water from Emmerich am Rhein (Germany), in particular with a hardness of 17 ° dH (German degrees), in accordance with UNE-EN 12829.

Table 4 shows the friction coefficients obtained for the lubricating compositions described in table 1 and table 2 of example 1.

Table 4 Coefficients of friction for PET bottles (µ) Lubricating compositions µ one 0.15 2 0.13 3 0.13 four 0.11 5 0.13 6 0.16 C1 0.17 C2 0.20 C3 0.18

From the results of the experiment it is seen that the lubricating compositions corresponding to the present invention can reduce the friction of the conveyor system (low friction coefficients) in comparison with comparative experiments for both glass bottles and PET bottles.

Thus, more versatile lubricant compositions for conveyor systems can be obtained.

Compositions 1 and 2 are particularly preferred for glass bottles.

Moreover, compositions 4 and 5, in which the carboxylic acid ester is a mixture

I) C ₈ carboxylic acid ester having an average degree of ethoxylation of 8, and

Ii) an oleyl ester of a carboxylic acid having an average degree of ethoxylation of 2, and

Iii) an oleyl ester of a carboxylic acid having an average degree of ethoxylation of 5,

are particularly preferred for both glass and PET bottles.

Example 4. The viscosity of the lubricating compositions for conveyor systems

Some of the water-based lubricant compositions for conveyor systems of Table 1 of Example 1 were slightly diluted to obtain intermediate partially diluted compositions (8% by weight of the active component). Their viscosity at 20 ° C was measured with a Brookfield viscometer (supplied by Brookfield Engineering Laboratories Inc. Stoughton, MA, USA) in accordance with DIN 1341 (spindle 2 at 30 rpm for viscosities up to 1000 mPa * s; spindle 3 at 12 rpm for viscosities in the range from 1000 to 7000 mPa * s; spindle 4 at 12 rpm for viscosities of more than 7000 mPa * s).

Dilution of the lubricant compositions of the present invention was performed with tap water from Emmerich am Rhein (Germany), in particular with a hardness of 17 ° dH (German degrees), in accordance with UNE-EN 12829.

Table 5 Viscosity Values (20 ° C) Lubricating compositions
(8 wt.% A.m.) Viscosity (MPa * s) one 5100 2 500 3 300 four 150

All compositions are visually transparent without the formation of any deposits, sediment or oil layer.

From the results of the experiments, it can be concluded that the water-based lubricant compositions for conveyor systems of the present invention are pumpable and homogeneous at room temperature. Moreover, it should be noted that compositions in which the carboxylic acid ester is a mixture

I) C ₈ carboxylic acid ester having an average degree of ethoxylation of 8, and

Ii) an oleyl ester of a carboxylic acid having an average degree of ethoxylation of 2, and

Iii) an oleyl ester of a carboxylic acid having an average degree of ethoxylation of 5,

are particularly preferred in terms of viscosity (better succumb to pumping).

Example 5. Other lubricating compositions corresponding to the invention

Table 6 Other lubricating compositions of the present invention (components as active substance) 7 8 9 10 eleven 12 Polyoxyethylene (3) octyl ether phosphoric acid ¹ 30,0 --- --- --- --- --- Polyoxyethylene (2,5) phosphoric acid lauryl myristyl ester ² --- 30,0 --- --- --- --- Polyoxyethylene (2) oleyl ester of phosphoric acid ³ --- --- 30,0 --- --- --- Polyoxyethylene (3) phosphoric acid oleyl ester ⁴ --- --- --- 30,0 --- --- Polyoxyethylene (5) phosphoric acid oleyl ester ⁵ --- --- --- --- 30,0 --- Polyoxyethylene (9) phosphoric acid oleyl ester ⁶ --- --- --- --- --- 30,0 Polyoxyethylene (2) carboxylic acid oleyl ester ⁷ 27.8 27.8 27.8 27.8 27.8 27.8 Polyoxyethylene (5) carboxylic acid oleyl ester ⁸ 3,5 3,5 3,5 3,5 3,5 3,5 Polyoxyethylene (8) Caprylic acid carboxylic ester ⁹ 15.6 15.6 15.6 15.6 15.6 15.6 Oleic acid 12,2 12,2 12,2 12,2 12,2 12,2 Oleyl alcohol 7.3 7.3 7.3 7.3 7.3 7.3 Deionized water Up to 100 Up to 100 Up to 100 Up to 100 Up to 100 Up to 100 ¹ Phosphate ester of ethoxylated (3 OE) octanol, ratio of monoester to diester 65:35
² Phosphate ester of ethoxylated (2.5 OE) lauryl-myristyl alcohol, ratio of monoester to diester 60:40
³ Phosphate ester of ethoxylated (2 OE) oleyl alcohol, the ratio of monoester to diester 60:40
⁴ Phosphate ester of ethoxylated (3 OE) oleyl alcohol, the ratio of monoester to diester 67:33
⁵ Phosphate ester of ethoxylated (5 OE) oleyl alcohol, ratio of monoester to diester 60:40
⁶ Phosphate ester of ethoxylated (9 OE) oleyl alcohol, ratio of monoester to diester 65:35
⁷ Carboxylic acid oleic ester with an average degree of ethoxylation 2
⁸ Carboxylic acid oleic ester with an average degree of ethoxylation 5
⁹ Caprylic ester of carboxylic acid with an average degree of ethoxylation 8

Table 7 Other lubricating compositions of the present invention (components as active substance) 13 fourteen fifteen 16 17 eighteen Phosphoric Lauryl Myristyl Ether ¹ 30,0 --- --- --- --- --- Polyoxyethylene (12) phosphoric acid lauryl myristyl ether ² --- 30,0 --- --- --- --- Phosphoric Cetyl Ether ³ --- --- 30,0 --- --- --- Polyoxyethylene (12) phosphoric acid cetyl ester ⁴ --- --- --- 30,0 --- --- Phosphoric Oleyl Ether ⁵ --- --- --- --- 30,0 --- Polyoxyethylene (5) phosphoric acid oleyl ester ⁶ --- --- --- --- --- 30,0 Polyoxyethylene (2) carboxylic acid oleyl ester ⁷ 27.8 27.8 27.8 27.8 27.8 27.8 Polyoxyethylene (5) carboxylic acid oleyl ester ⁸ 3,5 3,5 3,5 3,5 3,5 3,5 Polyoxyethylene (8) Caprylic acid carboxylic ester ⁹ 15.6 15.6 15.6 15.6 15.6 15.6 Oleic acid 12,2 12,2 12,2 12,2 12,2 12,2 Oleyl alcohol 7.3 7.3 7.3 7.3 7.3 7.3 Deionized water Up to 100 Up to 100 Up to 100 Up to 100 Up to 100 Up to 100 ¹ Lauryl-myristyl ether of phosphoric acid, the ratio of monoester to diester 55:45
² Phosphate ester of ethoxylated (12 OE) lauryl myristyl alcohol, ratio of monoester to diester 67:33
³ Phosphoric acid cetyl ether, ratio of monoester to diester 67:33
⁴ Phosphate ester of ethoxylated (12 OE) cetyl alcohol, the ratio of monoester to diester 67:33
⁵ Oleyl ester of phosphoric acid, the ratio of monoester to diester 55:45
⁶ Phosphate ester of ethoxylated (12 OE) oleyl alcohol, the ratio of monoester to diester 67:33
⁷ Carboxylic acid oleic ester with an average degree of ethoxylation 2
⁸ Carboxylic acid oleic ester with an average degree of ethoxylation 5
⁹ Caprylic ester of carboxylic acid with an average degree of ethoxylation 8

Table 8 Other lubricating compositions of the present invention (components as active substance) 19 twenty 21 22 23 24 25 Polyoxyethylene (3) phosphoric acid oleyl ester ¹ 30,0 30,0 30,0 30,0 30,0 30,0 30,0 Polyoxyethylene (2) carboxylic acid oleyl ester ² 31,4 --- --- --- --- --- 27.8 Polyoxyethylene (5) carboxylic acid oleyl ester ³ --- 30.5 --- --- --- --- 3,5 Polyoxyethylene (9) carboxylic acid oleyl ester ⁴ --- --- 29.8 --- --- --- --- Polyoxyethylene (2,5) carboxylic acid lauryl myristyl ether ⁵ --- --- --- 31,4 --- --- --- Polyoxyethylene (4,5) carboxylic acid lauryl myristyl ether ⁶ --- --- --- --- 30.5 --- --- Polyoxyethylene (3) carboxylic acid octyl ester ⁷ --- --- --- --- --- 30.8 --- Polyoxyethylene (8) Caprylic Carboxylic Acid ⁸ 15.6 15.6 15.6 15.6 15.6 15.6 --- Polyoxyethylene (8) caprylic ester of carboxylic acid ⁸ + Polyoxyethylene (3) hexyl ester of carboxylic acid ⁹ --- --- --- --- --- --- 15.6 Oleic acid 12,2 12,2 12,2 12,2 12,2 12,2 Oleyl alcohol 7.3 7.3 7.3 7.3 7.3 7.3 Deionized water Up to 100 Up to 100 Up to 100 Up to 100 Up to 100 Up to 100 ¹ Phosphate ester of ethoxylated (3 OE) oleyl alcohol, ratio of monoester to diester 55:45
² Carboxylic acid oleic ester with an average degree of ethoxylation 2
³ Carboxylic acid oleic ester with an average degree of ethoxylation 5
⁴ Carboxylic acid oleic ester with an average degree of ethoxylation 9
⁵ Carboxylic acid lauryl myristyl ether with an average degree of ethoxylation of 2.5
⁶ Carboxylic acid lauryl myristyl ether with an average degree of ethoxylation of 4.5
⁷ Carboxylic acid octyl ester with an average degree of ethoxylation 3
⁸ Medium ethoxylated caprylic ester of carboxylic acid 8
⁹ Medium ethoxylation hexyl ester of carboxylic acid 3

Table 9 Other lubricating compositions of the present invention (components as active substance) 26 27 28 29th thirty 31 32 Polyoxyethylene (3) phosphoric acid oleyl ester ¹ 30,0 30,0 30,0 30,0 30,0 30,0 30,0 Polyoxyethylene (2) carboxylic acid oleyl ester ² 27.8 27.8 27.8 27.8 --- --- --- Polyoxyethylene (5) carboxylic acid oleyl ester ³ 3,5 3,5 3,5 3,5 --- --- --- Polyoxyethylene (8) Caprylic ester of carboxylic acid ⁴ 15.6 15.6 15.6 15.6 15.6 15.6 15.6 Oleic acid --- 12,2 12,2 12,2 12,2 12,2 Coconut Oil Fatty Acid 12,2 --- --- --- --- --- --- Tall oil fatty acid --- 12,2 --- --- --- --- --- Oleyl alcohol 7.3 7.3 --- --- 7.3 7.3 7.3 Lauryl alcohol --- --- 7.3 --- --- --- --- Octyl alcohol --- --- --- 7.3 --- --- --- Polyoxyethylene (2) ether
Oleyl alcohol ⁵ --- --- --- --- 33.1 --- --- Polyoxyethylene (5) ether
oleyl alcohol ⁶ --- --- --- --- --- 33.1 --- Polyoxyethylene (9) ether
oleyl alcohol ⁷ --- --- --- --- --- --- 33.1 Deionized water Up to 100 Up to 100 Up to 100 Up to 100 Up to 100 Up to 100 Up to 100 ¹ Phosphate ester of ethoxylated (3 OE) oleyl alcohol, ratio of monoester to diester 55:45
² Carboxylic acid oleic ester with an average degree of ethoxylation 2
³ Carboxylic acid oleic ester with an average degree of ethoxylation 5
⁴ Carboxylic ester of carboxylic acid with an average degree of ethoxylation 8
⁵ Ethoxylated oleyl alcohol with an average degree of ethoxylation 2
⁶ Ethoxylated oleyl alcohol with an average degree of ethoxylation 5
⁷ Ethoxylated oleyl alcohol with an average degree of ethoxylation 9

Example 6. Lubricating compositions described in US-A-4895668

Got the lubricating composition described in US 4895668 (composition C5), and a similar lubricating composition, but containing phosphoric acid ester and fatty alcohol (example 33). These compositions are shown in table 10. Values are expressed in weight percent (components as active substances).

Table 10 C5 33 Sodium salt of xylene sulfonic acid (30% water. R-R) 13.00 13.00 EDTA tetrasodium salt (30% water. Solution) 20.00 20.00 Nonylphenol ethoxylated (9 EA) 5.00 --- Isopropanol 10.00 10.00 Unbranched alkylbenzenesulfonic acid 4.25 4.25 Sodium polyoxyethylene (4) carboxylic acid oleyl ester ¹ 5.00 3.75 Monoethanolamine 5.40 5.40 Tall oil fatty acid 20.00 20.00 Polyoxyethylene (3) phosphoric acid oleyl ester ² --- 1.25 Ethoxylated Lauryl Alcohol (9 EA) --- 5.00 Deionized water 17.35 17.35 ¹ Sodium oleic ester of a carboxylic acid with an average degree of ethoxylation 4
² Phosphate ester of ethoxylated (3 EO) oleyl alcohol, the ratio of monoester to diester 55:45

The dynamic friction coefficient (µ) for glass bottles and PET bottles for the above compositions was measured following the methods described in examples 2 and 3. The results are shown in table 11.

Table 11 Friction Coefficients for PET and Glass Bottles (µ) Lubricating compositions µ glass µ PET 33 0.14 0.16 C5 0.17 0.18

These results show that the composition of the present invention surpasses the composition of US Pat. No. 4,895,668 in lubricity for both glass and PET bottles.

Claims (19)

1. Lubricating composition containing the following essential elements:
a) one or more phosphoric acid esters of the formula (I) in which

R ¹ denotes a straight or branched, saturated or unsaturated C ₆ -C ₂₂ alkyl and / or alkenyl group, or R ³ (OCH ₂ CH ₂ ) _m group;
R ² is hydrogen, a straight or branched, saturated or unsaturated C ₆ -C ₂₂ alkyl and / or alkenyl group, or R ³ (OCH ₂ CH ₂ ) _m group;
R ³ is hydrogen or a straight or branched, saturated or unsaturated C ₆ -C ₂₂ alkyl and / or alkenyl group;
m is a number from 1 to 15; and
Z is hydrogen or a cation,
b) one or more carboxylic acid esters of formula (II) in which
RO- (CH ₂ CH ₂ O) n-CH ₂ COOM (Ii)
R is an unbranched or branched, saturated or unsaturated C ₆ -C ₂₂ alkyl and / or alkenyl group;
n is a number from 0.5 to 20; and
M is hydrogen or a cation selected from the group consisting of alkali metal, alkaline earth metal, ammonium, alkylammonium, alkanolammonium or glucammonium; and e) water; and
c) one or more C ₆ -C ₂₂ fatty acids, possibly ethoxylated with 1-20 moles of ethylene oxide; and / or
d) one or more C ₆ -C ₂₂ fatty alcohols, possibly ethoxylated with 1-20 moles of ethylene oxide;
where the content of the essential elements of the lubricating composition in percent by weight is:
a) 10-85% phosphoric acid esters of the formula (I)
b) 5-60% of carboxylic acid esters of formula (II)
c) 0.1-30% fatty acids
d) 0.1-30% fatty alcohols
e) water added to 100%. 2. A water-based lubricating composition according to claim 1, wherein the weight ratio of component (a) to component (b) is in the range of 5: 1 to 1: 3. 3. A water-based lubricating composition according to claim 1 or 2, wherein the phosphoric acid esters of formula (I) contain a mixture of mono-and diesters. 4. A water-based lubricating composition according to claim 3, in which the weight ratio of phosphoric acid monoesters to phosphoric acid diesters is from 50:50 to 95: 5. 5. The water-based lubricating composition according to claim 1, in which the C ₁₆ -C ₁₈ proportion in the alkyl and / or alkenyl groups of phosphoric acid esters is higher than 70%. 6. The water-based lubricating composition according to claim 1, wherein the phosphoric acid esters of formula (I) are ethoxylated having an average degree of ethoxylation of 2 to 8. 7. The water-based lubricating composition according to claim 1, wherein in the carboxylic acid esters of formula (II) n is in the range of 1 to 10, and M is hydrogen, sodium or potassium. 8. The water-based lubricating composition according to claim 1, in which the C ₁₆ -C ₁₈ proportion in fatty acids is higher than 70%. 9. The water-based lubricating composition according to claim 1, wherein the C ₁₆ -C ₁₈ proportion in fatty alcohols is higher than 70%. 10. The water-based lubricating composition according to claim 1, in which the weight ratio of phosphoric acid monoesters to phosphoric acid diesters is 50:50 to 95: 5, in which the C ₁₆ -C ₁₈ proportion in the alkyl and / or alkenyl groups of phosphoric acid esters higher than 70%, and in which the esters of phosphoric acid of the formula (I) are ethoxylated having an average degree of ethoxylation from 2 to 8. 11. A water-based lubricating composition according to claim 1, wherein the carboxylic acid esters of formula (II) are mixtures
I) C ₆ -C ₁₀ alkyl and / or alkenyl esters of carboxylic acids having an average degree of ethoxylation from 2 to 8
II) C ₁₂ -C ₁₈ alkyl and / or alkenyl esters of carboxylic acids having an average degree of ethoxylation from 1 to 10. 12. A water-based lubricating composition according to claim 11, containing expressed in weight percent,
a) 15-55% phosphoric acid esters of the formula (I)
b ₁ ) 5-20% C ₆ -C ₁₀ alkyl and / or alkenyl esters of carboxylic acids having an average degree of ethoxylation from 2 to 8
b ₂ ) 10-45% C ₁₂ -C ₁₈ alkyl and / or alkenyl esters of carboxylic acids having an average degree of ethoxylation from 1 to 10
c) 1-20% of the fatty acids defined in claim 1,
d) 1-20% fatty alcohols as defined in claim 1,
e) water added to 100%. 13. The concentrated water-based lubricating composition according to claim 11, in which the weight ratio of C ₁₂ -C ₁₈ alkyl and / or alkenyl ethers of carboxylic acids to C ₆ -C ₁₀ alkyl and / or alkenyl ethers of carboxylic acids ranges from 8: 1 to 1: 5. 14. A water-based lubricating composition according to claim 11, containing expressed in weight percent,
a) 15-55% phosphoric acid esters of the formula (I)
b ₁ ) 5-20% C ₆ -C ₁₀ alkyl and / or alkenyl esters of carboxylic acids having an average degree of ethoxylation from 2 to 8
b ₂ ) 10-45% C ₁₂ -C ₁₈ alkyl and / or alkenyl esters of carboxylic acids having an average degree of ethoxylation from 1 to 10
c) 1-20% of the fatty acids defined in claim 1,
d) 1-20% fatty alcohols as defined in claim 1,
e) water added to 100%,
where the weight ratio of C ₁₂ -C ₁₈ alkyl and / or alkenyl ethers of carboxylic acids to C ₆ -C ₁₀ alkyl and / or alkenyl ethers of carboxylic acids is in the range from 8: 1 to 1: 2. 15. A water-based lubricating composition obtained by diluting the water-based lubricating composition according to claim 1 from 2 to 10,000 times by volume, preferably from 5 to 1000. 16. A method for lubricating conveyor systems, comprising applying the lubricated diluted water-based composition of claim 15 to the conveyor system continuously or at intervals. 17. The method according to clause 16, in which the conveyor system is designed for glass bottles, plastic bottles, such as bottles of polyethylene terephthalate (PET) or polycarbonate (PC), cans, glass containers, barrels, cardboard containers and similar containers. 18. The use of a diluted water-based lubricant composition according to claim 15 for lubricating conveyor systems. 19. The use of claim 18, wherein the conveyor system is for glass bottles, plastic bottles such as polyethylene terephthalate (PET) or polycarbonate (PC) bottles, cans, glass containers, barrels, cardboard containers, and the like.