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CA2299080C - Fluorescent tracer dyes - Google Patents

Fluorescent tracer dyes Download PDF

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Publication number
CA2299080C
CA2299080C CA002299080A CA2299080A CA2299080C CA 2299080 C CA2299080 C CA 2299080C CA 002299080 A CA002299080 A CA 002299080A CA 2299080 A CA2299080 A CA 2299080A CA 2299080 C CA2299080 C CA 2299080C
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Prior art keywords
dye
composition
alkyloxyalkyl
refrigerant
groups
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Expired - Fee Related
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CA002299080A
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French (fr)
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CA2299080A1 (en
Inventor
Michael Robert Friswell
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Rohm and Haas Co
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Rohm and Haas Co
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    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M133/00Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen
    • C10M133/02Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen having a carbon chain of less than 30 atoms
    • C10M133/38Heterocyclic nitrogen compounds
    • C10M133/40Six-membered ring containing nitrogen and carbon only
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    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09BORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B57/00Other synthetic dyes of known constitution
    • C09B57/08Naphthalimide dyes; Phthalimide dyes
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09BORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B67/00Influencing the physical, e.g. the dyeing or printing properties of dyestuffs without chemical reactions, e.g. by treating with solvents grinding or grinding assistants, coating of pigments or dyes; Process features in the making of dyestuff preparations; Dyestuff preparations of a special physical nature, e.g. tablets, films
    • C09B67/0033Blends of pigments; Mixtured crystals; Solid solutions
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    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M171/00Lubricating compositions characterised by purely physical criteria, e.g. containing as base-material, thickener or additive, ingredients which are characterised exclusively by their numerically specified physical properties, i.e. containing ingredients which are physically well-defined but for which the chemical nature is either unspecified or only very vaguely indicated
    • C10M171/007Coloured or dyes-containing lubricant compositions
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    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28Esters
    • C10M2207/281Esters of (cyclo)aliphatic monocarboxylic acids
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    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28Esters
    • C10M2207/282Esters of (cyclo)aliphatic oolycarboxylic acids
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28Esters
    • C10M2207/283Esters of polyhydroxy compounds
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28Esters
    • C10M2207/286Esters of polymerised unsaturated acids
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/22Heterocyclic nitrogen compounds
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/22Heterocyclic nitrogen compounds
    • C10M2215/221Six-membered rings containing nitrogen and carbon only
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/22Heterocyclic nitrogen compounds
    • C10M2215/225Heterocyclic nitrogen compounds the rings containing both nitrogen and oxygen
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/22Heterocyclic nitrogen compounds
    • C10M2215/225Heterocyclic nitrogen compounds the rings containing both nitrogen and oxygen
    • C10M2215/226Morpholines
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    • C10M2215/00Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/30Heterocyclic compounds
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    • C10NINDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00Specified use or application for which the lubricating composition is intended
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    • C10NINDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00Specified use or application for which the lubricating composition is intended
    • C10N2040/30Refrigerators lubricants or compressors lubricants
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    • C10NINDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00Specified use or application for which the lubricating composition is intended
    • C10N2040/32Wires, ropes or cables lubricants
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10NINDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00Specified use or application for which the lubricating composition is intended
    • C10N2040/34Lubricating-sealants
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10NINDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00Specified use or application for which the lubricating composition is intended
    • C10N2040/36Release agents or mold release agents
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    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10NINDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00Specified use or application for which the lubricating composition is intended
    • C10N2040/38Conveyors or chain belts
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    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10NINDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00Specified use or application for which the lubricating composition is intended
    • C10N2040/40Generators or electric motors in oil or gas winning field
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    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10NINDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00Specified use or application for which the lubricating composition is intended
    • C10N2040/42Flashing oils or marking oils
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10NINDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00Specified use or application for which the lubricating composition is intended
    • C10N2040/44Super vacuum or supercritical use
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    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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    • C10N2040/00Specified use or application for which the lubricating composition is intended
    • C10N2040/50Medical uses

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Lubricants (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

A dye composition has the formula:
(see formula I) where R1 and R2 are the same or different and are selected from (A) C2-C12 alkyloxyalkyl, and (B) C9-12alkyl, (A) comprising from about 30 to 80 mole % of the R groups, (B) comprising 20 to about 70 mole % of the R groups. The dye composition is useful as a fluorescent tracer in refrigerant lubricants of the polyol ester types used in non-Freon refrigerants.

Description

Exp:ess :'lair La~e~ .~~.: E,L062 ~1:3L;S
Date of failing: rlarch 4, 199H
PATENT

FLUORESCENT TRACER DYES
The invention is directed to fluorescent tracer dyes for refrigerant lubricants.
Background of the Invention To detect leaks in refrigeration systems, it is customary to provide fluorescent tracer TM
dyes to refrigerant lubricants. Formerly, the refrigerant of choice was Freon which tolerated petroleum-based lubricants, in particular mineral oil. However, environmental concerns about TM TM
the ozone-depleting nature of Freon has required alternative Freon-free refrigerating and air-conditioning system, e.g., such as refrigerant gases sold under the tradenames R-134 and R-134a. Due to this change, special components, gaskets, seals, etc. are required, particularly z o in automotive applications. These systems are incompatible with petroleum-based lubricating systems.
TM
Alternative lubricants for Freon-free system are polyalkylene glycols .and polyol esters.
These are marketed by various companies, e.g. under trade names of Castrol SW20, Castrol AC flush and Mobile EAL 22. Most recently polyol esters have become the lubricants of choice for the industry. Up to this point, however, satisfactory dye molecules, which have liquid stability as a concentrate, have not been available. Dye manufacturers have unsuccessfully attempted to fluidize Solvent Yellow 43, a dye which is used for use in plastics, but has insufficient solubility in refrigerant lubricants for leak detection purposes.
Due to the sensitive nature, both environmentally and functionally, of refrigeration 2o systems, the industry desires.a fluorescent liquid colorant soluble in polyol ester type lubricants without the use of co-solvents. Formulating with co-solvents, particularly of an aromatic nature, may or may not help the liquid of a solid dye, such as C.I.
Solvent 43, but this does not meet the stringent requirements of the industry.

PATENT

Published PMN for Morton Yellow 10160 describes compounds having the formulae:
NC3Ho0,CH3 N-C3H60C2H40CH3 NHC3H60CH3 NHC3HbOC2H40CH3 ~C3H60C2H40CH3 ~C3H60CH3 N

+ ~ +

U.S. Patent No. 5,858,930 describes dyes useful for refrigerant lubricants having the general formula:
R' N
O= C C=O
;~~-' ,r ~i NH
Rz wherein R~ and RZ are each independently selected from branched alkyl groups containing 7 to PATENT

8 carbon atoms and alkyloxyalkyl groups containing 4 to 24 carbon atoms. These compositions are found to be weaker than desired and less stable than desired.
Summayy of the Invention In accordance with the invention there is provided a napthylimide dye composition having the formula:
R' /N\
O= C C=O
-,-. ~' ~1 NH.
R~
where R' and RZ are the same or different and are selected from (A) CZ-C,2 alkyloxyalkyl, and (B) C9.,Zalkyl, (A) comprising from about 30 to 80 mole % of the R groups, (B) comprising 20 to about 70 mole % of the R groups in a mixture of compounds of the above formula.
Preferably the alkyloxyalkyl moiety has 3-8 carbons. Preferably (B) is C9 alkyl, most 1 o preferably isononyl. Solutions of the dye composition in polyol ester lubricants of at least about 20 wt % , preferably at least about 25 wt % are achievable.
Surprisingly, when (B) has at least 9 carbon atoms, both strength and stability are meaningfully enhanced relative to the compounds of above-referenced U.S.
Patent No.
5,858,930, which disparages the use of isononyl.
PATENT

Detailed Description of Certain Preferred Embodiments Synthesis of the dye composition is by reaction of 4-halo, 1,8 naphthalic anhydride, preferably 4-chloro, l,8 naphthalic anhydride with an alkyloxyalkylamine or a mixture of an alkyloxyalkylamine and an alkylamine. The alkyl and alkylene groups may be straight or branched. Preferably, the molar ratio of alkyloxyalkylamine and alkyl amine is between about 2:1 and about 1:2, most preferably in the range of about 1:1.
The alkyloxyalkyl group preferably contains 1-12 carbon atoms, more preferably carbon atoms. The alkyloxyalkyl groups may contain multiple ether linkages.
Typical examples of alkyloxyalkyl groups include 2-ethylhexyloxypropy, methyloxypropyl, propyloxypropyl, 4-ethylhexyloxyethyl, methyloxyhexyloxypropyl and the like. A preferred alkyloxyalkylamine for forming the dye is methoxypropylamine. The preferred alkylamine for forming the dye is isononylamine. The currently preferred dye composition is prepared from a l: l molar ratio of methoxypropylamine and isononylamine.
The dye compositions of the present invention are generally soluble in polyol esters at levels of 20 wt % and above, most being soluble at levels of 25 wt % or above.
The high solubility in polyol esters is seen as very commercially attractive for reasons ~ of shipping and storage efficiencies. Importantly, the dye compositions of the present invention are insoluble in water because refrigerant systems must be moisture-free to avoid water, and water-insolubility helps to ensure that the dye does not retain moisture. When used in a 2 o refrigeration system, the dye concentrate is diluted to bring the dye to an end-use concentration as required by the end-user.
The dye compounds can be used in various oil and lubricant compositions as a dye for identification purposes, aesthetic reasons, or leak detection. Preferably the dye is used in a refrigerant lubricant. This includes the conventional refrigerant lubricants based on mineral 2 5 oils or other hydrocarbon compounds as well as the new refrigerant lubricants. The term "new refrigerant lubricants" refefs to the lubricant compositions formulated to accommodate non-chlorine-containing refrigerants. Preferably the new refrigerant lubricants are "R-134a PATENT

lubricants", meaning that the refrigerant R-134a (I,1,1,2-tetrafluoroethane) is fully miscible and compatible (no phase separation) with the lubricant over a temperature range of from 20°C.to 50 ° C at essentially all mixing ratios, such as from 1 /99 to 99/ 1.
The refrigerant lubricant is comprised mainly or solely of natural and/or synthetic oils.
The oils include naphthalenic oils such as alkyl naphthalenes; paraffinic oils; alkylated benzene oils; polyalkyl silicate oils; polyglycols such as polyalkylene glycols, polyoxyalkylene glycols and etherfied or polyol adducts thereof; esters such as polyol esters, dibasic acid esters, and polyesters; polyether polyols; polyvinyl ethers, polycarbonates; fluorinated silicones such as fluorinated polysiloxanes; perfluoroethers; and aromatic compounds with fluoroalkyloxy or 1 o fluoroalkylthio substituents. These oils are described in the following U.S. Pat. Nos. and in the references cited therein: 5,447,647, 5,512,198, 5,486,302, 5,616,812, 5,565,129, 5,378,385, and TM
5,547,593. Specific oils include polyethylene glycol esters such as RETRO 100 (which is a blend of polyethylene glycol esters) sold by Castrol Industrial North America, Inc.
The lubricant may be a mixture of two or more oils and may further contain other 1 S additives as is conventional in the art.
The liquid dye compounds are readily miscible with the refrigerant oil or lubricant composition and can be directly added thereto. The amount of the dye compound contained in the lubricant of the present invention is determined by the amount of fluorescent response desired. Generally the dye compound is contained in an amount of from about 100 ppm to 800 2 0 ppm, preferably from 150 ppm to 600 ppm and most preferably from 250 ppm to 400 ppm. If the dye concentration is too low, then the total fluorescent response will not be bright enough thereby rendering visual identification of the leak difficult. An excessively high concentration of the dye is wasteful and could potentially increase the chance of the dye falling out of solution at cold temperatures. The dye should be stable in the lubricant composition and preferably does not 2 5 crystallize or freeze out of the liquid lubricant composition above -25 ° C.
Although the dye compound is a liquid and thus can be added directly to the oil or lubricant composition, it is sometimes desirable to dilute the pure liquid compound with an PATENT

appropriate solvent such as a high boiling point organic solvent.
The high boiling point organic solvents useful for diluting the dye compounds are those which exhibit a boiling point (or flash point) above 65 ° C. and will not adversely effect a refrigerant composition or system, i.e., they are inert. Typically the dilution solvent is an aromatic hydrocarbon although any of the above mentioned oils can be used as the dilution solvent. Preferred dilution solvents include naphthalenic oils, paraffinic oils, alkylated benzene oils, and polyalkyl silicate oils. Alkyl naphthalenes are particularly preferred as the dilution solvent.
The amount of dilution depends in part on the fluorescent efficiency of the dye compound l0 or compounds. The dilution amount in the present invention is typically such that the fluorescent response is equivalent to the fluorescent response of a 10 to 50% (w/w) Solvent Yellow 43 concentrate, more preferably a 20 to 40% concentrate. That is, the coloring component of.the diluted solution, which comprises a mixture or dye compound of the .~~~ove formula, is present in an amount such that the total amount of light released by fluorescence is equal to the total amount of light released by fluorescence of the stated amount (e.g. 10%) of Solvent Yellow 43 in the same solvent. Typically the actual amount of the compounds is from 15 to 70% w/w. These diluted solutions are easy to handle and transport and have excellent resistance to crystallization, even when stored for up to 12 months at 0° F (-18°C).
Furthermore, they are immediately and instantly miscible with further refrigerant fluid and show no signs of crystallization even in the 2 0 presence of trace amounts of water.
The lubricant composition can be combined with a refrigerant in the usual manner and used in a refrigeration system. The refrigerants include fluorocarbons (meaning perfluoro- or hydrofluorocarbon) such as R-134a, and chlorofluorocarbons such as 1,1-dichloro-1,1-difluoromethane.
2 5 Fluorocarbons are preferred due to environmental factors.
The invention will how be described in greater detail by way of specific example.
4~
PATENT

Examl 1L
Mixed isononvl amino/3-methoxypropvl a_minc, ~t ~ t molar ratipZ~~~vlimide To a 500 gal. kettle was charged: 300 lbs. isobutyl alcohol 25 lbs. propylene glycol 1 lb. cupric acetate.
Agitation was begun and the kettle further charged with: 45 lbs. sodium acetate powder 116 lbs. 4-chloro, 1,8 napthalic anhydride.
Over 30 minutes was added: 67 lbs. 3-methoxypropyl amine 108 lbs. isononyl amine;
The kettle was maintained below 40°C during amine addition, the reaction exhibiting a slight exotherm. Once all the amine was added, the kettle was steam heated to a temperature of 105-110°C and the reaction refluxed at this temperature for 30 minutes.
Following a 24 hold at 70 ° C, there was added:
72 gal. water 40 lbs hydrochloric acid.
The mixture was heated to 80°C. 5 pounds of tretolite 330- was added.
The mixture was agitated for two minutes and let sit for 30 minutes. The water phase was removed.
Next, 72 gallons of water were added with agitation, the mixture heated to 80°C, and 5 pounds 2 0 of tretolite 3300 added. Agitation was stopped and the mixture let stand for 30 minutes. The water phase was separated. The organic phase was stripped and dried to 120°C and cooled immediately to 90°C. 200 lbs Mobil EAL 22 POE solvent was added and the mixture stirred for 15 minutes. The dye solution was at 25 wt% concentration.

' CA 02299080 2000-02-22 _ , -, r PATENT

Example 2 (comparative) A 25 wt% dye concentration was synthesized substituting ethylhexyl amine (Ca amine) for isononyl amine according to the method of Example 1. Both dye compositions were stored at 0°C. The isononyl composition was stable. Crystallization was observed in the ethylhexyl composition after 14 days.

Claims (15)

1. ~A dye composition comprising a mixture of dye compounds having the formula:
where R1 and R2 are the same or different and are selected from (A) C2-C12 alkyloxyalkyl, and (B) C9-C12 alkyl, wherein from about 30 to 80 mole % of the R1 and R2 groups in the composition are C2-C12 alkyloxyalkyl and from~
about 20 to 70 mole % of the R1 and R2 groups in the composition are C9-C12 alkyl, with the proviso that when (B) is C9 alkyl, (B) is iso-nonyl.
2. ~A solution of the dye composition of Claim 1 in a polyol ester lubricant.
3. ~A solution of at least about 20 wt % of the dye composition of Claim 1 in a polyol ester lubricant.
4. ~A solution of at least about 25 wt% of the dye composition of Claim 1 in a polyol ester lubricant.
5. ~The composition according to Claim 1 wherein (B) is iso-nonyl.
6. ~The composition according to Claim 1 wherein (A) is C3-C8 alkyloxyalkyl.
7. ~The composition according to Claim 1 wherein (A) is 3-Methoxypropyl.
8. ~A dye composition comprising a mixture of dye compounds having the formula:
where R1 and R2 are the same or different and are selected from (A) C2-C12 alkyloxyalkyl, and (B) C9-C12 alkyl, wherein from about 30 to 68 mole % of the R1 and R2 groups in the composition are C2-C12 alkyloxyalkyl and from about 32 to 70 mole % of the R1 and R2 groups in the composition are C9-C12 alkyl.
9. ~A solution of the dye composition of Claim 8 in a polyol ester lubricant.
10. A solution of at least about 20 wt % of the dye composition of Claim 8 in a polyol ester lubricant.
11. A solution of at least about 25 wt% of the dye composition of Claim 8 in a polyol ester lubricant.
12. The composition according to Claim 8 wherein (B) is C9 alkyl.
13. The composition according to Claim 8 wherein (B) is iso-nonyl.
14. The composition according to Claim 8 wherein (A) is C3-C8 alkyloxyalkyl.
15. The composition according to Claim 8 wherein (A) is 3-Methoxypropyl.
CA002299080A 1999-03-04 2000-02-22 Fluorescent tracer dyes Expired - Fee Related CA2299080C (en)

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Application Number Priority Date Filing Date Title
US09/262,729 US6150306A (en) 1999-03-04 1999-03-04 Fluorescent tracer dyes
US09/262,729 1999-03-04

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CA2299080C true CA2299080C (en) 2005-05-10

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ES2225022T3 (en) 2005-03-16
CA2299080A1 (en) 2000-09-04
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EP1033391A2 (en) 2000-09-06

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