Note: Descriptions are shown in the official language in which they were submitted.
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1 ACA 5737 :~
POLYPHENYLENE ETHER LUBRICANT CONTAINING
HYDROCARBYL BIS(DIHYDROCARBYLPHOSPHATE) COMPOUND
BACKGROUND OF THE INVENTION
Polyphenylene ether luhricants represent very stable
organic structures which meet the needs of jet engines, high
temperature hydraulic systems, nuclear power plants, and as
the fluid component o~ high temperature greases~ Although :
this class of lubricant is thermally and oxidati~ely stable, :
they can cause significant wear of high-alloy steels that are
typically used in supersonic and hyper~onic aircraft jet
engines. :~
Polyphenylene ether lubricants have been proposed which
contain various additives for a variety of purposes. A
representative, non-limiting listing of additives which have
been proposed is as followso
- chelates of a heavy metal of Groups I~IV and VI-VIII
of the Periodic Table of the ~lements for wear and oxidation - ~
resistance and non-sludging behavior (U.S. Patent No. : :
3,360,467); -
- organolead compounds for increased resistance to :~ :
oxidation, improved viscosity stability, and increased color
stability (U.SO Patent No. 3,423,4693;
- perfluorinated aliphatic dibasic acids for enhanced
lubrication under high load at high temperatures (U.S. Patent
No. 3,704,277);
- phenoxyphenylphosphinic acid for enhanced lubrication
under high load at high temperature (U.S. Patent No.
3,706l668).
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2 ACA 5737
SUMMARY OF THE INVENTION
The present invention relates to a polyphenylene ether
lubricant comprising an effective amount of a hydrocarbyl
bis(dihydrocarbylphosphate) compound a~ an anti~wear
additive. These additives have been unexpectedly ~ound not
to significantly affect the excellent thermal stability of
the polyphenylene ether lubricant. Hydrocarbyl bis(dihydro-
carbylphosphate) compounds have been used as additives in
fuels for internal combustion engines (U.S. Patent No.
3,254,973), as extreme pressure and anti-wear additives in
oleaginous or petroleum based lubricants (U.S. Patent No.
3,492,373; also see U.S. Patent No. 3,360,467 at Col. 1, line ::
58 to Col. 2, line 2, for the non-predictablD behavior of
such additives when in a polyphenylene either fluid), and a~
a low flammability hydraulic oil, in general (U.S. Patent No.
4,212,832).
DESCRIPTION OF PREFERRED EMBODIMENTS :
The polyphenylene ether lubricant of the present .
invention comprises, as the base stock, a polyphenylene ether :~
of the formula
Ar-O-[Ar-O]n-Ar
where Ar stands for a phenyl ring, n is a whole number of
generally from 2 to 5. This class of lubricant is well known
to persons of ordinary skill in the art with the following
patents, which are incorporated herein by reference,
providing further disclosure: U.S. Patent Nos. 3,360,467;
3,423,469; 3,476,~15;`3,704,277; and 3,70~,668. Generally
speaking, the polyphenylene ether base stock will comprise
from about 90% to about 99.5%, by weight, of the entire ;~
lubricant composition.
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3 ACA 5737 -
The hydrocarbyl(bisdihydrocarbylphosphate) compounds
which are used as an anti-wear additive with the previously
described polyphenylene ether base stock are of the fsrmula
RO O O OR ~: -
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PO-A-OP
-~
RO OR
, where ~ is either unsubstituted or substituted hydrocarbyl
such as alkyl or aryl and A is a bridging group containing
alkylene, haloalkylene, arylene, two arylene groups joined by
a bridging group (e.g., -C(CH3), -S02 or CO), or a bridging
group containing biarylene. Such compounds are a known class
of flame retardant in polymers and, as indicated above, have
had some degree of use in certain fuel and lubricant ~ :~
compositions. Preferred R groups are phenyl with A also
being phenylene, such a6 derived from a monoaromatic diol,
such as either resorcinol of hydroquinoneO Generally, such :~:
diphosphate additive is present in relatively low amount such
as about 0.1% to about 10%, by weight of the composition.
The polyphenylene ether lubricants of the present
invention can contain other additives, particularly those
recognized for use in fluids of that type. Inclusive of such -~
additives are pour point depressants, viscosity index -~
improvers, dyes, rust inhibitors, other anti-wear additives,
and the like. - ~ x
The present invention is further illustrated by the
Examples which follow.
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4 ACA 5737
EXAMPLE 1
This Example sets forth the wear data at various
temperatures and loads (Four-Ball Wear scar at 600 rpm for
two hours, two runs) for a control polyphenylene ether fluid
and similar flu~ds containing certain bisphosphate additives:
Bisphosphate in ~ Temperature, Load, Steel --~
Sample (%~ 75CL40 kgLA** 204C/10 kq~B** 260C/10 kq/B**
None* (0%) 1.13; 1.20 1.44; 0.99 N.D.
NGBDP (1%) 0.71; 0.73 N.D. N.D.
BABDP (1%) 0.92; 0.91 N.D. N.D.
RBDP (1%) 0.87, 0.86N.D. N.D.
NGBDP (3~) 0.69; 0.68 N.D. N.D.
BABDP (3%) 0.70; 0.69 N.D. N.D.
RBDP ~3%) 0.80; 0.720.65; 0.670.43; 0.54 ~ :
NGBDP (5%) 0.70; 0.71 N.D. N.D.
BABDP (5%) 0.70; 0.70 N.D. N.D.
RBDP (5%) 0.78; 0.770.73; 0.79 N.D. ; `~
. ................. ....................................................... ... .. : . i
N.D. = not determined.
* = The control fluid was a po].yphenylene ether fluid
containing antioxidants ancl metal deactivators at a
total concentration o~ leiss than 5~ by weight. It .
conformed to MIL-L-87100 speci~icationO
** = A = 521000 a high-carbon ~teel, aircraft grade,
meeting QQ-S-624 specification.
B = M50: tool steel, meeting AMS 6490 specification. ~
NGEIDP = Neopentyl glycol bis (diphenyl phosphate) O ! : BABDP = Bisphenol A bis(diphenyl phosphate~.
R~DP = Resorcinol bis(diphenyl phosphate).
:
All three of the bisphosphate additives tested showed good -~
performance in the Four-Ball wear test. :~
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6 ACA 5737 : :
The above data illustrate the poorer performance for the
neopentyl glycol bis(diphenyl phosphate additive ("NGBDP") as
compared to either the bisphenol A or resorcinol derived ~:
bisphosphates ("BABDP" and '~RBDP", respectively).
The foregoing Examples should not be construed in a
limiting sense since they merely serve to illustrate certain
embodiments of the invention. The scope of protection sought
is set forth in the claims which follow.
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