Composition comprising halogenated oil

Details Composition comprising halogenated oil Composition comprising halogenated oil

2001-06-28

2003-03-04

McAvoy, Ellen M. (Department: 1764)

Solid anti-friction devices, materials therefor, lubricant or se

Lubricants or separants for moving solid surfaces and...

Inorganic compound

C508S136000, C508S148000, C508S155000, C508S165000, C508S181000, C508S182000, C508S183000, C508S206000, C508S208000, C508S421000, C508S435000, C508S464000, C508S527000, C508S552000, C508S582000

Reexamination Certificate

active

06528457

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to a composition, which comprises a halogenated oil and a basic thickener and can be used as a lubricant in the presence of strong electric field and high voltage applications.
BACKGROUND OF THE INVENTION
A spark plug boot is the cover over the high voltage terminal and is typically made of a silicone rubber. A lubricant is used to aid placement of the boot and to prevent the boot from sticking to the plug. Presently KRYTOX GPL205 (a grease containing KRYTOX GPL 105 perfluoropolyether oil thickened only with polytetrafluoroethylene) is used to fill the small internal space between the boot and the plug to provide this lubrication. Likewise, similar products are marketed for the same application. Trademarks herein are denoted by upper case names.
Under severe environment, the boot and grease are subject to a high voltage corona discharge. When hydrocarbon or silicone lubricants are used, the silicone rubber boot tends to adhere to the ceramic insulator of the plug.
A variety of types of physical barriers have been used as release agents in the spark plug-to-spark plug boot interface in automotive applications to improve the dielectric capability of the interface and to prevent the spark plug and spark plug boot from bonding to each other. However, such techniques do not meet desired characteristics for a superior release agent.
Heretofore, greases and powders have been put in the boots, and fluorotelomer coatings have been put on spark plugs. U.S. Pat. No. 5,385,686 (hereinafter referred to as “Miller et al” and incorporated herein by reference), which contains a section diagram of the spark plug and boot assembly, discloses use of boot lubricant grease consisting of a PTFE (polytetrafluoroethylene)-based oil and a poly(dimethylsiloxane) extender.
The desired characteristics of a superior release agent, as disclosed in Miller et al, are to (1) provide excellent dielectric capability, (2) prevent spark plug-to-spark plug boot bonding, (3) sustain acceptable engage/disengage forces for the interface, (4) insure no detrimental physical or chemical effects on the interface components, (5) remain operable after elevated temperatures and environmental exposures, (6) process easily and readily, (7) be cost effective; and (8) protect the spark-plug-boot from perfluoropolyether corona discharge products.
The above-described spark plug boot greases do not meet the desired characteristics for one reason or another. Some greases tend to dry up and even fall out of the interface over a period of time resulting in poor dielectric and mechanical properties. Powders often have undesired mechanical properties. Plug coatings, such as fluorotelomer, are usually much too expensive to be commercially utilized in automotive applications. Standard perfluoropolyether (PFPE) greases or admixtures of PFPE greases with silicones cannot protect the spark plug boot from corona discharges found in the current boot environment. Splitting of the boots due to the corona-induced decomposition of PFPEs has been observed in testing and the industry.
Therefore, there is a need to develop a lubricant that can overcome the shortcomings disclosed above.
SUMMARY OF THE INVENTION
According to a first embodiment, there is provided a composition that comprises, consists essentially of, consists of, or is produced by combining, a halogenated oil, a basic thickener, and optionally an additional thickener in which the basic thickener is a metal hydroxide, a metal salt, an ammonium salt, or combinations of two or more thereof.
According to a second embodiment, there is provided a spark plug boot that comprises a composition applied thereto in which the composition can be the same as that disclosed above in the first embodiment of the invention.
DETAILED DESCRIPTION OF THE INVENTION
The term “halogenated oil” used herein referred to a perfluoropolyether, a fluorosilicone, a polytrifluorochloroethylene, or combinations of two or more thereof.
Any perfluoropolyether, known to one skilled in the art can be used in the invention composition. A common characteristic of perfluoropolyethers is the presence of perfluoroalkyl ether moieties. The term “perfluoropolyether” is exchangeable with “PFPE”, “PFPE oil”, “PFPE fluid”, “PFPAE”, or “perfluoropolyalkylether”, as is known to one skilled in the art.
For example, KRYTOX available from E. I. du Pont de Nemours and Company, Wilmington, Delaware is a perfluoropolyether having the formula of CF
3
—(CF
2
)
2
—O—[CF(CF
3
)—CF
2
—O)
s
—R
f
. In the formula, s is 2-100, inclusive and R
f
is CF
2
CF
3
, a C
3
to C
6
perfluoroalkyl group , or combinations thereof.
FOMBLIN and GALDEN fluids, available from Ausimont, Milan, Italy and produced by perfluoroolefin photooxidation, can also be used. FOMBLIN-Y can have the formula of CF
3
O(CF
2
CF(CF
3
)—O—)
m
(CF
2
—O—)
n
—R
1
f
. Also suitable is CF
3
O[CF
2
CF(CF
3
)O]
m
(CF
2
CF
2
O)
o
(CF
2
O)
n
—R
1
f
. In the formulae R
1
f
is CF
3
, C
2
F
5
, C
3
F
7
, or combinations of two or more thereof; (m+n) is 8-45, inclusive; and m
is 20-1000, inclusive. o is>1; (m+n+o) is 8-45, inclusive;m
is 20-1000, inclusive; R
2
f
is CF
3
, C
2
F
5
, or combinations thereof; t is 2-200, inclusive; (p+q) is 40-180, inclusive; and p/q is 0.5-2, inclusive
FOMBLIN-Z can have the formula of CF
3
O(CF
2
CF
2
—O—)
p
(CF
2
—O)
q
CF
3
where (p+q) is 40-180 and p/q is 0.5-2, inclusive.
DEMNUM fluids, available from Daiken Industries, Japan, can also be used. It can be produced by sequential oligomerization and fluorination of 2,2,3,3-tetrafluorooxetane, yielding the formula of F—[(CF
2
)
3
—O]
t
—R
2
f
where R
2
f
is CF
3
, C
2
F
5
, or combinations thereof and t is 2-200, inclusive.
Perfluoropolyethers comprising branched or straight chain perfluoroalkyl radical end groups, each of which having 3 or more carbon atoms per end group can also be used. Examples of such perfluoropolyethers can have the formula of C
r
F
(2r+1)
—A—C
r
F
(2r+1)
in which each r is independently 3 to 6; A can be O—(CF(CF
3
)CF
2
—O)
w
, O—(CF
2
—O)
x
(CF
2
CF
2
—O)
y
, O—(C
2
F
4
—O)
w
, O—(C
2
F
4
—O)
x
(C
3
F
6
—O)
y
, O—(CF(CF
3
)CF
2
—O)
x
(CF
2
—O)
y
, O—(CF
2
CF
2
CF
2
—O)
w
, O—(CF(CF
3
)CF
2
—O)
x
(CF
2
CF
2
—O)
y
—(CF
2
—O)
z
, or combinations of two or more thereof; preferably A is O—(CF(CF
3
)CF
2
—O)
w
, O—(C
2
F
4
—O)
w
, O—(C
2
F
4
—O)
x
(C
3
F
6
—O)
y
, O—(CF
2
CF
2
CF
2
—O)
w
, or combinations of two or more thereof; w is 4 to 100; x and y are each independently 1 to 100. Specific examples include, but are not limited to, F(CF(CF
3
)—CF
2
—O)
9
—CF
2
CF
3
, F(CF(CF
3
)—CF
2
—O)
9
—CF(CF
3
)
2
, and combinations thereof. In such PFPEs, up to 30% of the halogen atoms can be halogens other than fluorine, such as, for example, chlorine atoms.
Fluorosilicones suitable for use in the invention can be any fluorocarbon containing silicone fluid. The preferred fluorosilicone is a fluorosilane, a fluorosiloxane, or combinations thereof. A suitable fluorosilicone can have the formula of R
f
(CH
2
)
n
—Si—R′
3
in which R
f
and n are the same as those disclosed above and each R′ can be independently an alkyl group, an alkoxy group, a thioalkyl group, an amino group, an aryl group, or combinations of two or more thereof. An example of suitable fluorosilicone is DOW CORNING FS-1265 fluorosilicone oil from Dow Corning, Midland, Mich.
Polytrifluorochloroethylenes suitable for use in the invention can have the formula of (—CCl
2
CFCl—)
s
where s is a number of 2 to about 100. Example of suitable polytrifluorochloroethylenes are HALOCARBON oils from Halocarbon, Riveredge, N.J. The preferred polytrifluorochloroethylene is HALOCARBON 200.
The basic thickener is one or more metal hydroxides, ammonium salts, and basic metal salts. The preferred basic thickeners are ammonium salts, alkali metal salts, and alkaline earth metal salts such as, for example, carbonates, bicarbonates, phosphates, carboxylates, or nitrites. The term “phosphate” used herein refers to “phosphate”,

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