U.S. patent application number 12/575354 was filed with the patent office on 2010-04-15 for food grade rotary screw compressor lubricant.
Invention is credited to Troy F. Paquette, Eric J. Peter.
Application Number | 20100093572 12/575354 |
Document ID | / |
Family ID | 42099412 |
Filed Date | 2010-04-15 |
United States Patent
Application |
20100093572 |
Kind Code |
A1 |
Paquette; Troy F. ; et
al. |
April 15, 2010 |
Food Grade Rotary Screw Compressor Lubricant
Abstract
Embodiments of the invention provide a food grade lubricant,
such as one of synthetic or mineral oil origin, which can be used
for the lubrication of rotary screw compressors. The lubricant
composition can include a blend of incidental food contact
authorized ester or a distilled, acetylated monoglyceride. The
lubricant composition can also include an incidental food contact
authorized polyether polyol having an average molecular weight
number greater than about 1500. The blend can be compounded with
additives including one or more of antioxidants, corrosion
inhibitors, metal passivators, and anti-foam agents that are
cleared for incidental food contact.
Inventors: |
Paquette; Troy F.;
(Hartland, WI) ; Peter; Eric J.; (Elm Grove,
WI) |
Correspondence
Address: |
GREENBERG TRAURIG (PHX)
INTELLECTUAL PROPERTY DEPARTMENT, 2450 COLORADO AVENUE , SUITE 400E
SANTA MONICA
CA
90404
US
|
Family ID: |
42099412 |
Appl. No.: |
12/575354 |
Filed: |
October 7, 2009 |
Related U.S. Patent Documents
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
|
|
61195367 |
Oct 7, 2008 |
|
|
|
Current U.S.
Class: |
508/208 ;
508/501 |
Current CPC
Class: |
C10M 169/04 20130101;
C10M 2209/1085 20130101; C10M 2209/1055 20130101; C10M 2223/047
20130101; C10M 2215/065 20130101; C10M 2219/084 20130101; C10M
2215/064 20130101; C10M 2207/2895 20130101; C10M 2209/1045
20130101; C10M 2207/026 20130101; C10N 2030/62 20200501; C10M
2215/04 20130101; C10M 2215/223 20130101; C10M 2207/283 20130101;
C10M 2207/2835 20130101; C10M 2223/043 20130101; C10M 2215/06
20130101; C10M 2215/224 20130101; C10M 2229/02 20130101; C10M
2209/1075 20130101 |
Class at
Publication: |
508/208 ;
508/501 |
International
Class: |
C10M 169/04 20060101
C10M169/04; C10M 129/76 20060101 C10M129/76 |
Claims
1. A food grade lubricant composition for use with a rotary screw
compressor, the lubricant composition comprising: about 5 to about
95 weight percent of a distilled, acetylated monoglyceride; and
about 95 to about 5 weight percent of at least one of a polyglycol
with a minimum molecular weight of about 1500;
[alpha]-Butyl-omega-hydroxypoly(oxypropylene);
[alpha]-Butyl-omega-hydroxypoly(oxyethylene) poly(oxypropylene);
and [alpha]-Hydro-omega-hydroxypoly(oxyethylene)
poly(oxypropylene).
2. The lubricant composition of claim 1 wherein the
[alpha]-Butyl-omega-hydroxypoly(oxyethylene) poly(oxypropylene) is
produced by random condensation of an approximately 1:1 mixture by
weight of ethylene oxide and propylene oxide with butanol.
3. The lubricant composition of claim 1 wherein the
[alpha]-Hydro-omega-hydroxypoly (oxyethylene) poly(oxypropylene) is
produced by random condensation of mixtures of ethylene oxide and
propylene oxide including about 25 to about 75 percent by weight of
ethylene oxide.
4. The lubricant composition of claim 1 wherein any polyoxyalkylene
glycols include homopolymers.
5. The lubricant composition of claim 1 wherein any polyoxyalkylene
glycols include random copolymers.
6. The lubricant composition of claim 1 wherein any polyoxyalkylene
glycols include block copolymers.
7. The lubricant composition of claim 1 and further comprising at
least one of: an effective amount of at least one antioxidant; an
effective amount of at least one ferrous metal corrosion inhibitor;
an effective amount of a cuprous deactivator; an effective amount
of at least one anti-wear/lubricity additive; and an effective
amount of an antifoam agent.
8. The lubricant composition of claim 1 and further comprising at
least one of: about 0.25% to about 2.0% weight percent of an
aromatic amine antioxidant; about 0.25% to about 2.0% weight
percent of a phenolic antioxidant; about 0.05% to about 2.0% weight
percent of at least one ferrous metal corrosion inhibitor; about
0.05% to about 0.10% weight percent of a cuprous metal deactivator;
about 0.25% to about 0.50% weight percent of at least one anti-wear
and lubricity additive; and about 20 parts per million to about 100
parts per million of a dimethylpolysiloxane antifoam additive.
9. A method of lubricating a rotary screw air compressor wherein
the compressor is continuously run for long time intervals without
changing out the lubricant which comprises using as the lubricant
the composition of claim 7.
10. A method of lubricating a rotary screw air compressor wherein
the compressor is continuously run for long time intervals without
changing out the lubricant which comprises using as the lubricant
the composition of claim 8.
Description
RELATED APPLICATIONS
[0001] This application claims priority under 35 U.S.C. .sctn.119
to U.S. Provisional Patent Application No. 61/195,367 filed on Oct.
7, 2008, the entire contents of which is incorporated herein by
reference.
BACKGROUND
[0002] This invention relates to lubricants and, more particularly,
to food grade lubricating oils which are especially useful as
compressor oils for equipment in the food service industry.
[0003] The equipment used in the food processing industry varies by
segment with the three leading segments being meat and poultry,
beverages, and dairy. While the equipment varies from segment to
segment, the majority of manufacturing operations require
significant amounts of compressed air. Due to the importance of
ensuring and maintaining safeguards and standards of quality for
food products, the food industry must comply with the rules and
regulations set forth by the United States Department of
Agriculture (USDA), originally under The Food Safety and Inspection
Service (FSIS), as part of the Federal Food, Drug and Cosmetic Act
(FFDCA), which holds responsibility for all programs for the
inspection, grading, and standardization of meat, poultry, eggs,
dairy products, fruits, and vegetables.
[0004] Under the FFDCA, specifically section 21 CFR 178.3570,
lubricants which are susceptible to incidental food contact are
considered indirect food additives under USDA regulations.
Lubricants classified as "H1" are authorized for incidental food
contact. H1 authorized lubricating oil and the term "food grade"
will be used interchangeably herein and in the appended claims.
[0005] Several market factors accentuate the need for a superior
food grade lubricating oil. Some manufacturers prefer to use only
H1 authorized oils to avoid the possibility of noncompliance.
Reducing contamination risks and inventory carrying costs
associated with stocking multiple inventories of varying
viscosity/FDA approval level oils also provides an economic
incentive for exclusive use of H1 authorized oils. Furthermore,
other firms, reliant upon company image as a marketing resource,
may elect to take the conservative approach to health and safety
issues and utilize only H1 authorized oils. All of these concerns
are addressed by the exclusive use of H1 authorized oils.
[0006] In addition to meeting the requirements for safety set by
federal regulatory agencies, the product must be an effective
lubricant. Lubricating oils for food processing plants should
lubricate machine parts, resist viscosity change, resist oxidation,
protect against rusting and corrosion, provide wear protection,
prevent foaming, and resist the formation of sludge in service. The
product should also perform effectively at various lubrication
regimes ranging from hydrodynamic thick film regimes to boundary
thin film regimes.
[0007] The oxidation, thermal, and hydrolytic stability
characteristics of lubricating oil help predict how effectively an
oil will maintain its lubricating properties over time and resist
sludge formation. Hydrocarbon oils are partially oxidized when
contacted with oxygen at elevated temperatures for prolonged
periods of time. The oxidation process produces acidic bodies
within the lubricating oil which are corrosive to metals often
present in food processing equipment. Many metals present in food
processing equipment and in contact with both the oil and the air
are effective oxidation catalysts which further increase the rate
of oxidation. Oxidation products contribute to the formation of
sludge which can clog valves, plug filters, and result in the
over-all breakdown of the viscosity characteristics of the
lubricant. Under some circumstances, sludge formation can result in
plugging, complete loss of oil system flow, and failure or damage
to machinery.
[0008] The thermal and hydrolytic stability characteristics of
lubricating oil reflect primarily on the stability of the
lubricating oil additive package. The stability criteria monitor
sludge formation, viscosity change, acidity change, and the
corrosion tendencies of the oil. Hydrolytic stability assesses
these characteristics in the presence of water. Inferior stability
characteristics result in the lubricating oil losing lubricating
properties over time and precipitating sludge.
SUMMARY
[0009] In light of the problems discussed above, it is desirable to
provide an improved food grade lubricating oil. Some embodiments of
the invention provide a food grade lubricant, such as a lubricating
oil of synthetic or mineral oil origin, which can be used for the
lubrication of rotary screw compressors. The lubricant composition
can include a blend of incidental food contact authorized ester or
distilled, acetylated monoglyceride. The lubricant composition can
also include an incidental food contact authorized polyether polyol
having an average molecular weight number greater than about 1500.
The blend can be compounded with additives including one or more of
antioxidants, corrosion inhibitors, metal passivators, and
anti-foam agents that are cleared for incidental food contact.
DETAILED DESCRIPTION
[0010] Before any embodiments of the invention are explained in
detail, it is to be understood that the invention is not limited in
its application to the details set forth in the following
description. The invention is capable of other embodiments and of
being practiced or of being carried out in various ways. Also, it
is to be understood that the phraseology and terminology used
herein is for the purpose of description and should not be regarded
as limiting. The use of "including," "comprising," or "having" and
variations thereof herein is meant to encompass the items listed
thereafter and equivalents thereof as well as additional items.
[0011] The following discussion is presented to enable a person
skilled in the art to make and use embodiments of the invention.
Various modifications to the embodiments will be readily apparent
to those skilled in the art, and the generic principles herein can
be applied to other embodiments and applications without departing
from embodiments of the invention. Thus, embodiments of the
invention are not intended to be limited to embodiments described,
but are to be accorded the widest scope consistent with the
principles and features disclosed herein. Skilled artisans will
recognize the examples provided herein have many useful
alternatives and fall within the scope of embodiments of the
invention.
[0012] Some embodiments of the invention provide a lubricant, such
as one of synthetic or mineral oil origin, which can be used for
the lubrication of rotary screw compressors where enhanced
oxidative stability, improved wear protection, corrosion inhibition
and varnish control are desired. The lubricant of some embodiments
of the invention can provide an excellent balance of these
performance properties.
[0013] The lubricant of some embodiments of the invention can be
used to replace rotary screw compressor lubricants that do not meet
the incidental food contact requirements. The food grade lubricant
of some embodiments meets and exceeds all requirements necessary
for incidental food contact (H1) approval as determined by the
FFDCA. The lubricant of some embodiments can include an incidental
food contact authorized synthetic lubricating fluid for use in
rotary screw compressor applications that conforms to the
requirements for incidental food contact as defined under 21 CFR
178.3570.
[0014] In some embodiments, the lubricant composition can include a
blend of incidental food contact authorized ester (e.g., derived
from hindered mono/polyhydric alcohols and one or more alkanoic
acid constituents) or distilled, acetylated monoglyceride. The
lubricant composition can also include an incidental food contact
authorized polyether polyol having an average molecular weight
number greater than about 1500. The blend can be compounded with
additives including one or more of antioxidants, corrosion
inhibitors, metal passivators, and anti-foam agents that are
cleared for incidental food contact.
[0015] Current incidental food contact lubricants utilized in this
equipment provide inferior varnish control. Some embodiments of the
invention can substantially reduce or eliminate varnishing, extend
lubricant drain intervals, and significantly enhance equipment life
and operation. The lubricant can provide significant performance
improvements in oxidation stability, elastomer compatibility,
hydrolytic stability, improved wear protection, corrosion
inhibition and varnish control. It can also provide superior
protection from sludging, rust and corrosion protection, and foam
resistance. In some embodiments, to achieve these objectives, the
high performance food grade lubricant can include synthetic food
grade base oils and a sufficient amount of an additive package to
impart exceptional performance characteristics to the lubricating
fluid.
Base Oil
[0016] In some embodiments, the base oils for use in the lubricant
composition can include FFDCA authorized distilled, acetylated
monoglyceride, produced by the distillation of mono-diglycerides
produced from the esterification between a triglyceride with
glycerol, and food grade polyglycols derived from ethylene oxide,
propylene oxide, 1-2, or 2-3 butylene oxide. The above oxides can
be polymerized alone (i.e., homopolymerized) or in combination. The
combined oxides can also be combined in a random or block addition.
While some of the above compounds may be of a hydrophyllic nature,
those of a hydrophobic nature are preferred, such as those derived
from propylene oxide, butylene oxides, or combinations thereof.
Examples of suitable materials include, but are not limited to,
[alpha]-Butyl-omega-hydroxypoly(oxypropylene), minimum molecular
weight about 1,500; [alpha]-Butyl-omega-hydroxypoly(oxyethylene)
poly(oxypropylene) produced by random condensation of a 1:1 mixture
by weight of ethylene oxide and propylene oxide with butanol,
minimum molecular weight about 1,500; and
[alpha]-Hydro-omega-hydroxypoly(oxyethylene) poly(oxypropylene)
produced by random condensation of mixtures of ethylene oxide and
propylene oxide containing 25 to 75 percent by weight of ethylene
oxide, minimum molecular weight about 1,500. The foregoing
polyglycols can have a flash point greater than about 375.degree.
F. and preferably greater than about 450.degree. F. They can also
have a minimum average molecular weight of about 1500. In some
embodiments, the polyglycols can be blended to give a base
lubricant composition containing about 5 weight percent to about 95
weight percent of the distilled acetylated monoglycerides and about
95 weight percent to about 5 weight percent of the polyglycols,
respectively.
[0017] The lubricant composition when used in a rotary screw air
compressor can be selected to have a viscosity in the range of
about 15 centistokes to about 100 centistokes at about 40 degrees
Celsius and a pour point in the range of about 0 degrees Celsius to
about minus 40 degrees Celsius.
Additive Technology
[0018] In some embodiments, the lubricant composition can include
effective amounts of one or more of the following additives:
antioxidants, corrosion inhibitors, metal deactivators, lubricity
additives, dispersants, antifoam agents, and other such additives
as may be desired.
Antioxidants
[0019] The antioxidant package for the lubricant composition can
include a combination of food grade phenolic and aminic
antioxidants. The class of phenolic antioxidants which can be
employed include food grade, oil-soluble, sterically hindered
phenols and thio-phenols. Included within the definition of
phenolic and thiophenolic antioxidants are sterically hindered
phenolics such as hindered phenols and bis-phenols, hindered
4,4'-thiobisphenols, hindered 4-hydroxy- and 4-thiolbenozoic acid
esters and dithio esters, and hindered bis(4-hydroxy- and
4-thiolbenzoic acid and dithio acid) alkylene esters. Examples of
sterically hindered phenols include 2,6-di-tert-butyl-p-cresol,
2,6-di-tert-amyl-p-cresol, and
2-tert-butyl-6-tert-amyl-p-cresol.
[0020] A second group of hindered phenolic antioxidants are the
hindered bisphenols. Examples of these compounds include
4,4'-methylene bis(2,6-bi-tert-butylphenol), 4,4'-dimethylene
bis(2,6-di-tert-butyl phenol), 4,4'-trimethylene
bis(2,2-di-tert-amyl phenol),
hexamethylenebis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate),
tetrakis[methylene(3,5-di-tert-butyl-4-hydroxyhydro-cinnamate)]methane,
and 4,4'-trimethylene bis(2,6-di-tert-butyl phenol).
[0021] Additional hindered phenolic antioxidants utilized include a
group of hindered thio bis-phenols, (i.e., where the sulfur is
connected to another phenolic group). Examples of these compounds
include 4,4'-thio bis(2,6-di-sec-butyl phenol), 4,4'-thio
bis(2-tert-butyl-6-isopropyl phenol),
thiodiethylenebis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate), and
4,4'-thio bis(2-methyl-6-t-butyl phenol).
[0022] A fourth group of hindered phenolic antioxidants are the
alkoxy phenols. Examples of these compounds include butylated
hydroxy anisole (BHA) and butylated hydroquinone.
[0023] Suitable food grade, oil-soluble aromatic amine antioxidants
include phenyl-[alpha]- and/or phenyl-[beta]-naphthylamines,
naphthyl phenyl amines, alkylated phenyl naphthyl amines, and
alkylated diphenyl amines. Examples of aromatic amine antioxidants
include, N-phenyl-ar-(1,1,3,3-tetramethylbutyl)-1-naphthalenamine,
N-phenyl-alpha-naphthylamine,
N-p-methyl-phenyl-alpha-naphthylamine, N-phenylbenzenamine,
reaction products with 2,4,4-trimethylpentene and the
diphenylamines such as disecbutyldiphenylamine, and
dioctyldiphenylamine.
[0024] The phenolic and aromatic amine combination can range in
ratio by weight from about 20:1 to about 1:20, although the
preferred ratio ranges from about 4:1 to about 1:1. Treat rates can
range from about 0.25% to about 2.0% by weight of the lubricating
fluid. Oxidation stability performance is superior and fairly
consistent over the preferred ratio range. Additional performance
increase is made available by the utilization of
tris(2,4-di-tert-butylphenyl)phosphite as a secondary peroxide
decomposer.
Corrosion Inhibitors
[0025] The anti-rust additive package for the lubricant composition
can include a combination of food grade surface active anti-rust
ingredients. Anti-rust lubricating additives which can be employed
include food grade phosphoric acid, mono and dihexyl ester
compounds with tetramethyl nonyl amines. Examples include
phosphoric acid, mono- and diisooctyl esters, reacted with
tert-alkyl and (C.sub.12-C.sub.14) primary amines and phosphoric
acid, mono- and dihexyl esters compounded with
tetramethylnonylamines and (C.sub.12-C.sub.14) alkyl amines.
[0026] Additional corrosion inhibition is provided by utilization
of 2-(8-Heptadecenyl)-4,5-dihydro-1H-imidazole-1-ethanol alone or
in synergistic combination with
N-Methyl-N-(1-oxo-9-octadecenyl)glycine. In some embodiments, the
food grade anti-rust additives can include about 0.05% to about
2.0% by weight of the lubricating oil.
[0027] Additional performance benefits can be obtained by the
addition of
N,N-Bis(2-ethylhexyl)-ar-methyl-1H-benzotriazole-1-methanamine, a
cuprous metal deactivator, at about 0.10% by weight of the
lubricating oil.
Anti-Wear Additives
[0028] Anti-wear additives for the lubricant composition can
include food grade oil-soluble sulfur and/or phosphorus containing
compounds. Compounds meeting this criteria include triphenyl
phosphorothionate, tri[2(or 4)-C.sub.9-10-branched
alkylphenyl]phosphorothioate and phosphorothioic acid,
O,O,O-triphenyl ester, tert-butyl derivatives, alone or in
combination, including about 0.25% to about 0.5% by weight of the
lubricating fluid.
Anti-Foam
[0029] A dimethylpolysiloxane (viscosity greater than 300
centistokes (cSt)) for use in the lubricant composition can provide
antifoam performance at treat rates ranging from about 20 to about
100 parts per million (PPM).
[0030] In some embodiments, effective amounts of the foregoing
additives for use in a rotary screw air compressor is generally in
the range from about 0.1 to about 3 weight percent for the
antioxidants, about 0.05 to about 1.5 weight percent for the
corrosion inhibitors, and about 0.05 to about 0.1 weight percent
for the metal deactivators. Antiwear additization can be generally
in the range of about 0.25 to about 0.50 weight percent. These
weight percentages are based on the total weight of the lubricating
fluid. More of less of the additives can be used depending upon the
circumstances for which the final compositions are to be used.
[0031] The following examples illustrate the practice of specific
embodiments of the invention and comparison cases. These examples
should not be interpreted as limitations of the scope of the
invention.
Example 1
[0032] A food grade compressor fluid was prepared in a beaker by
adding: [0033] a) 4.67% by weight of a distilled, acetylated
monoglyceride with a viscosity of 15 cSt at 40.degree. C. and
88.73% by weight of a food grade polyglycol base fluid with a
viscosity of 100.3 cSt at 40.degree. C.; [0034] b) 0.50% by weight
of Hexamethylenebis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate);
[0035] c) 0.50% by weight of N-phenylbenzenamine, reaction products
with 2,4,4-trimethylpentene; [0036] d) 0.50% by weight of
Thiodiethylenebis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate);
[0037] e) 0.50% by weight of
Tetrakis[methylene(3,5-di-tert-butyl-4-hydroxyhydro-cinnamate)]methane;
[0038] f) 0.50% by weight of
N-phenyl-ar-(1,1,3,3-tetramethylbutyl)-1-naphthalenamine; [0039] g)
0.50% by weight of BHT (butylated hydroxyl toluene,
2,6-di-tert-butyl-p-cresol); [0040] h) 0.50% by weight of BHA
(butylated hydroxy anisole); [0041] i) 0.50% by weight of
phosphoric acid, mono- and diisooctyl esters, reacted with
tert-alkyl and (C.sub.12-C.sub.14) primary amines; [0042] j) 0.50%
by weight of phosphoric acid, mono- and dihexyl esters compounded
with tetramethylnonylamines and (C.sub.12-C.sub.14) alkyl amines;
[0043] k) 0.50% by weight of Triphenyl phosphorothionate; [0044] l)
0.50% by weight of
2-(8-Heptadecenyl)-4,5-dihydro-1H-imidazole-1-ethanol; [0045] m)
0.50% by weight of N-Methyl-N-(1-oxo-9-octadecenyl)glycine; [0046]
n) 0.10% by weight of
N,N-Bis(2-ethylhexyl)-ar-methyl-1H-benzotriazole-1-methanamine; and
[0047] o) 40 Parts Per Million (PPM) of a dimethylpolysiloxane.
Viscometrics of the sample were:
TABLE-US-00001 [0047] Viscosity 100.degree. C. 18.3 centistokes
(cSt); Viscosity 40.degree. C. 91.3 centistokes (cSt); and
Viscosity Index 222.
Example 2
[0048] A food grade compressor fluid was prepared in a beaker by
adding: [0049] a) 19.18% by weight of a distilled, acetylated
monoglyceride with a viscosity of 15 cSt at 40.degree. C. and
74.72% by weight of a food grade polyglycol base fluid with a
viscosity of 100.3 cSt at 40.degree. C.; [0050] b) 0.50% by weight
of Hexamethylenebis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate);
[0051] c) 0.50% by weight of N-phenylbenzenamine, reaction products
with 2,4,4-trimethylpentene; [0052] d) 0.50% by weight of
Thiodiethylenebis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate);
[0053] e) 0.50% by weight of
Tetrakis[methylene(3,5-di-tert-butyl-4-hydroxyhydrocinnamate)]methane;
[0054] f) 0.50% by weight of
N-phenyl-ar-(1,1,3,3-tetramethylbutyl)-1-naphthalenamine; [0055] g)
0.50% by weight of BHT (butylated hydroxyl toluene,
2,6-di-tert-butyl-p-cresol); [0056] h) 0.50% by weight of BHA
(butylated hydroxy anisole); [0057] i) 0.50% by weight of
phosphoric acid, mono- and diisooctyl esters, reacted with
tert-alkyl and (C.sub.12-C.sub.14) primary amines; [0058] j) 0.50%
by weight of phosphoric acid, mono- and dihexyl esters compounded
with tetramethylnonylamines and (C.sub.12-C.sub.14) alkyl amines;
[0059] k) 0.25% by weight of Tri[2(or 4)-C.sub.9-40-branched
alkylphenyl]phosphorothioate; [0060] l) 0.50% by weight of
2-(8-Heptadecenyl)-4,5-dihydro-1H-imidazole-1-ethanol; [0061] m)
0.25% by weight of N-Methyl-N-(1-oxo-9-octadecenyl)glycine; [0062]
n) 0.10% by weight of
N,N-Bis(2-ethylhexyl)-ar-methyl-1H-benzotriazole-1-methanamine; and
[0063] o) 40 Parts Per Million (PPM) of a dimethylpolysiloxane.
Viscometrics of the sample were:
TABLE-US-00002 [0063] Viscosity 100.degree. C. 13.9 centistokes
(cSt); Viscosity 40.degree. C. 68.7 centistokes (cSt); and
Viscosity Index 212.
Example 3
[0064] A food grade compressor fluid was prepared in a beaker by
adding: [0065] a) 37.86% by weight of a distilled, acetylated
monoglyceride with a viscosity of 15 cSt at 40.degree. C. and
56.04% by weight of a food grade polyglycol base fluid with a
viscosity of 100.3 cSt at 40.degree. C.; [0066] b) 0.50% by weight
of Hexamethylenebis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate);
[0067] c) 0.50% by weight of N-phenylbenzenamine, reaction products
with 2,4,4-trimethylpentene; [0068] d) 0.50% by weight of
Thiodiethylenebis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate);
[0069] e) 0.50% by weight of
Tetrakis[methylene(3,5-di-tert-butyl-4-hydroxyhydro-cinnamate)]methane;
[0070] f) 0.50% by weight of
N-phenyl-ar-(1,1,3,3-tetramethylbutyl)-1-naphthalenamine; [0071] g)
0.25% by weight of BHT (butylated hydroxyl toluene,
2,6-di-tert-butyl-p-cresol); [0072] h) 0.50% by weight of BHA
(butylated hydroxy anisole); [0073] i) 0.50% by weight of
phosphoric acid, mono- and diisooctyl esters, reacted with
tert-alkyl and (C.sub.12-C.sub.14) primary amines; [0074] j) 0.50%
by weight of phosphoric acid, mono- and dihexyl esters compounded
with tetramethylnonylamines and (C.sub.12-C.sub.14) alkyl amines;
[0075] k) 0.25% by weight of Phosphorothioic acid, O,O,O-triphenyl
ester, tert-butyl derivatives; [0076] l) 0.50% by weight of
2-(8-Heptadecenyl)-4,5-dihydro-1H-imidazole-1-ethanol; [0077] m)
0.50% by weight of N-Methyl-N-(1-oxo-9-octadecenyl)glycine; [0078]
n) 0.10% by weight of
N,N-Bis(2-ethylhexyl)-ar-methyl-1H-benzotriazole-1-methanamine; and
[0079] o) 40 Parts Per Million (PPM) of a dimethylpolysiloxane.
Viscometrics of the sample were:
TABLE-US-00003 [0079] Viscosity 100.degree. C. 9.7 centistokes
(cSt); Viscosity 40.degree. C. 47.0 centistokes (cSt); and
Viscosity Index 197.
Example 4
[0080] A food grade compressor fluid was prepared in a beaker by
adding: [0081] a) 56.94% by weight of a distilled, acetylated
monoglyceride with a viscosity of 15 cSt at 40.degree. C. and
38.36% by weight of a food grade polyglycol base fluid with a
viscosity of 100.3 cSt at 40.degree. C.; [0082] b) 0.50% by weight
of Hexamethylenebis(3,5-di-tent-butyl-4-hydroxyhydrocinnamate);
[0083] c) 0.50% by weight of N-phenylbenzenamine, reaction products
with 2,4,4-trimethylpentene; [0084] d) 0.50% by weight of
Thiodiethylenebis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate);
[0085] e) 0.50% by weight of
Tetrakis[methylene(3,5-di-tert-butyl-4-hydroxyhydro-cinnamate)]methane;
[0086] f) 0.50% by weight of
N-phenyl-ar-(1,1,3,3-tetramethylbutyl)-1-naphthalenamine; [0087] g)
0.50% by weight of BHT (butylated hydroxyl toluene,
2,6-di-tert-butyl-p-cresol); [0088] h) 0.50% by weight of BHA
(butylated hydroxy anisole); [0089] i) 0.50% by weight of
phosphoric acid, mono- and diisooctyl esters, reacted with
tert-alkyl and (C.sub.12-C.sub.14) primary amines; [0090] j) 0.10%
by weight of phosphoric acid, mono- and dihexyl esters compounded
with tetramethylnonylamines and (C.sub.12-C.sub.14) alkyl amines;
[0091] k) 0.10% by weight of
N,N-Bis(2-ethylhexyl)-ar-methyl-1H-benzotriazole-1-methanamine; and
[0092] l) 40 Parts Per Million (PPM) of a dimethylpolysiloxane.
Viscometrics of the sample were:
TABLE-US-00004 [0092] Viscosity 100.degree. C. 6.7 centistokes
(cSt); Viscosity 40.degree. C. 32.2 centistokes (cSt); and
Viscosity Index 173.
Example 5
[0093] A food grade compressor fluid was prepared in a beaker by
adding: [0094] a) 75.92% by weight of a distilled, acetylated
monoglyceride with a viscosity of 15 cSt at 40.degree. C. and
18.98% by weight of a food grade polyglycol base fluid with a
viscosity of 100.3 cSt at 40.degree. C.; [0095] b) 0.50% by weight
of Hexamethylenebis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate);
[0096] c) 0.50% by weight of N-phenylbenzenamine, reaction products
with 2,4,4-trimethylpentene; [0097] d) 0.50% by weight of
Thiodiethylenebis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate);
[0098] e) 0.50% by weight of
Tetrakis[methylene(3,5-di-tert-butyl-4-hydroxyhydro-cinnamate)]methane;
[0099] f) 0.50% by weight of
N-phenyl-ar-(1,1,3,3-tetramethylbutyl)-1-naphthalenamine; [0100] g)
0.50% by weight of BHT (butylated hydroxyl toluene,
2,6-di-tert-butyl-p-cresol); [0101] h) 0.50% by weight of BHA
(butylated hydroxy anisole); [0102] i) 0.50% by weight of
phosphoric acid, mono- and diisooctyl esters, reacted with
tert-alkyl and (C.sub.12-C.sub.14) primary amines; [0103] j) 0.50%
by weight of phosphoric acid, mono- and dihexyl esters compounded
with tetramethylnonylamines and (C.sub.12-C.sub.14) alkyl amines;
[0104] k) 0.10% by weight of
N,N-Bis(2-ethylhexyl)-ar-methyl-1H-benzotriazole-1-methanamine; and
[0105] l) 40 Parts Per Million (PPM) of a dimethylpolysiloxane.
Viscometrics of the sample were:
TABLE-US-00005 [0105] Viscosity 100.degree. C. 4.7 centistokes
(cSt); Viscosity 40.degree. C. 22.0 centistokes (cSt); and
Viscosity Index 132.
Example 6
[0106] A food grade compressor fluid was prepared in a beaker by
adding: [0107] a) 90.16% by weight of a distilled, acetylated
monoglyceride with a viscosity of 15 cSt at 40.degree. C. and 4.75%
by weight of a food grade polyglycol base fluid with a viscosity of
100.3 cSt at 40.degree. C.; [0108] b) 0.50% by weight of
Hexamethylenebis(3,5-di-tent-butyl-4-hydroxyhydrocinnamate); [0109]
c) 0.50% by weight of N-phenylbenzenamine, reaction products with
2,4,4-trimethylpentene; [0110] d) 0.50% by weight of
Thiodiethylenebis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate);
[0111] e) 0.50% by weight of
Tetrakis[methylene(3,5-di-tert-butyl-4-hydroxyhydro-cinnamate)]methane;
[0112] f) 0.50% by weight of
N-phenyl-ar-(1,1,3,3-tetramethylbutyl)-1-naphthalenamine; [0113] g)
0.50% by weight of BHT (butylated hydroxyl toluene,
2,6-di-tert-butyl-p-cresol); [0114] h) 0.50% by weight of BHA
(butylated hydroxy anisole); [0115] i) 0.50% by weight of
phosphoric acid, mono- and diisooctyl esters, reacted with
tert-alkyl and (C.sub.12-C.sub.14) primary amines; [0116] j) 0.50%
by weight of phosphoric acid, mono- and dihexyl esters compounded
with tetramethylnonylamines and (C.sub.12-C.sub.14) alkyl amines;
[0117] k) 0.10% by weight of
N,N-Bis(2-ethylhexyl)-ar-methyl-1H-benzotriazole-1-methanamine; and
[0118] l) 40 Parts Per Million (PPM) of a dimethylpolysiloxane.
Viscometrics of the sample were:
TABLE-US-00006 [0118] Viscosity 100.degree. C. 3.6 centistokes
(cSt); Viscosity 40.degree. C. 16.3 centistokes (cSt); and
Viscosity Index 88.
[0119] It will be appreciated by those skilled in the art that
while the invention has been described above in connection with
particular embodiments and examples, the invention is not
necessarily so limited, and that numerous other embodiments,
examples, uses, modifications and departures from the embodiments,
examples and uses are intended to be encompassed by the claims
attached hereto. The entire disclosure of each patent and
publication cited herein is incorporated by reference, as if each
such patent or publication were individually incorporated by
reference herein. Various features and advantages of the invention
are set forth in the following claims.
* * * * *