U.S. patent application number 11/298658 was filed with the patent office on 2006-05-11 for novel hydrogen-absorbing composition, process for its preparation and use as composition for filling optical fibre cables.
This patent application is currently assigned to SOCIETE D' EXPLOITATION DE PRODUITS POUR LES INDUSTRIES CHIMIQUES SEPPIC. Invention is credited to Gerard Trouve.
Application Number | 20060100110 11/298658 |
Document ID | / |
Family ID | 8852148 |
Filed Date | 2006-05-11 |
United States Patent
Application |
20060100110 |
Kind Code |
A1 |
Trouve; Gerard |
May 11, 2006 |
Novel hydrogen-absorbing composition, process for its preparation
and use as composition for filling optical fibre cables
Abstract
Composition, characterized in that it comprises a
hydrocarbonaceous compound or a mixture of hydrocarbonaceous
compounds, a nonzero proportion of one or more transition metals
and a nonzero proportion of at least one slightly polar dispersing
liquid fatty phase, having one or more hydrocarbonaceous chains,
with an HLB of between 0.5 and 9, preferably between 4 and 9. Its
process of preparation and its use as composition for filling
optical fibre cables.
Inventors: |
Trouve; Gerard; (Castres,
FR) |
Correspondence
Address: |
YOUNG & THOMPSON
745 SOUTH 23RD STREET
2ND FLOOR
ARLINGTON
VA
22202
US
|
Assignee: |
SOCIETE D' EXPLOITATION DE PRODUITS
POUR LES INDUSTRIES CHIMIQUES SEPPIC
PARIS CEDEX
FR
|
Family ID: |
8852148 |
Appl. No.: |
11/298658 |
Filed: |
December 12, 2005 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
09897880 |
Jul 5, 2001 |
|
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11298658 |
Dec 12, 2005 |
|
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Current U.S.
Class: |
508/116 |
Current CPC
Class: |
B01J 20/22 20130101;
G02B 6/4492 20130101; B01J 20/26 20130101 |
Class at
Publication: |
508/116 |
International
Class: |
C10M 169/04 20060101
C10M169/04 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 5, 2000 |
FR |
000 8762 |
Claims
1. A composition, comprising a hydrocarbonaceous and/or silicone
compound or a mixture of hydrocarbonaceous and/or silicone
compounds, a nonzero proportion of one or more transition metals
and a nonzero proportion of at least one slightly polar dispersing
liquid fatty-phase, having one or more hydrocarbonaceous chains,
with an HLB of between 0.5 and 9, wherein one or more metal
catalysts are present in an amount up to 5% by weight of said
composition, and wherein the metal catalyst is selected from the
group consisting of palladium powder, platinum powder, nickel
powder, iron pentacarbonyl, chloroplatinic acid, copper chromite,
Raney nickel, palladium supported on active charcoal, palladium
supported on alumina, platinum supported on alumina, and platinum
supported on active charcoal, and wherein a silicone compound is
present and said silicone compound is a silicone oil selected from
the group consisting of poly(alkylsiloxanes) and
poly(dimethyl-siloxanes) with high molecular weights.
2. The composition as defined in claim 1, wherein said composition
comprises from 50% to 90% by weight of hydrocarbonaceous and/or
silicone compound or of mixture of hydrocarbonaceous and/or
silicone compounds.
3. The composition as defined in claim 1, wherein a
hydrocarbonaceous compound is present and the hydrocarbonaceous
compound is a polymer selected from the group consisting of
poly-alpha-olefins, polyisobutene, propylene-ethylene,
propylene-butene and propylene-hexene copolymers,
propylene-butene-ethylene terpolymers and polybutadienes.
4. The composition as defined in claim 1, wherein said composition
comprises up to approximately 5% of a viscosifying polymer.
5. The composition as defined in claim 1, wherein said composition
comprises up to approximately 2% of an antioxidizing agent.
6. The composition as defined in claim 1, wherein the slightly
polar dispersing liquid fatty phase, having one or more
hydrocarbonaceous chains, with an HLB of between 0.5 and 9, is
liquid at ambient temperature.
7. The composition as defined in claim 1, wherein said composition
comprises from 1% to 20% by weight of dispersing fatty phase.
8. The composition as defined in claim 7, wherein the ratio by
weight of the metal catalyst or catalysts to the dispersing fatty
phase in the composition is between approximately 0.01 and
0.20.
9. The composition as defined in claim 1, wherein the dispersing
fatty phase is chosen from vegetable oils.
10. A composition, comprising a hydrocarbonaceous and/or silicone
compound or a mixture of hydrocarbonaceous and/or silicone
compounds, a nonzero proportion of one or more transition metals
and a nonzero proportion of at least one slightly polar dispersing
liquid fatty phase, having one or more hydrocarbonaceous chains,
with an HLB of between 0.5 and 9, wherein the dispersing fatty
phase is selected from the group consisting of methyl esters of
vegetable oils, monoglycerides or diglycerides obtained by
controlled hydrolysis of vegetable oils, weakly alkoxylated
vegetable oils, weakly ethoxylated vegetable oils, propoxylated
vegetable oils, ethoxylated vegetable oils comprising from 1 to 10
ethylene oxide units, weakly alkoxylated methyl esters of vegetable
oils, weakly ethoxylated and/or propoxylated methyl esters of
vegetable oils, and methyl esters of vegetable oils ethoxylated
with 1 to 4 ethylene oxides.
11. The composition as defined in claim 9, wherein the vegetable
oil is selected from the group consisting of sunflower oil,
rapeseed oil, maize oil, soybean oil, castor oil, linseed oil,
coconut oil, groundnut oil, olive oil, palm oil and hydrogenated
palm oil.
12. The composition as defined in claim 7, wherein the dispersing
fatty phase is chosen from surface-active agents having an HLB
number of between 1 and 9.
13. The composition as defined in claim 12, wherein the dispersing
fatty phase is chosen from linear or branched fatty alcohols or
fatty acids comprising from 5 to 30 carbon atoms.
14. The composition as defined in claim 7, wherein the dispersing
fatty phase is chosen from surface-active agents which are liquid
at ambient temperature.
15. The composition as defined in claim 7, wherein the dispersing
fatty phase is chosen from optionally weakly alkoxylated
surface-active agents comprising an oleyl, oleyl/cetyl, linoleyl or
behenyl chain.
Description
[0001] A subject-matter of the invention is novel
hydrogen-absorbing compositions comprising dispersing agents and
their use in the manufacture of optical fibre cables.
[0002] Optical fibres, which make possible the transmission of
increasingly large amounts of information, are laid in cables
liable to be subjected to significant mechanical and chemical
stresses, in particular when they are submarine cables. To restrict
the effects of these stresses, the fibres are protected by metal or
plastic sheathings and are "immersed" in greases which contribute
to cushioning the impacts and to restricting the microcurves which
result therefrom and which interfere with the transmission of the
signals. These microcurves are also caused by the appearance of
hydrogen microbubbles which form inside the grease at the time of
the manufacture of the cable, during welding operations or over
time as an effect of ageing. This is why some greases currently
sold comprise compounds which absorb hydrogen.
[0003] Thus, the French patent application published under the
number 2 607 311 discloses a hydrophobic thixotropic composition
intended for the manufacture of optical fibre cables comprising 100
parts by weight of a lubricating fluid composed of 30% to 100% by
weight of polybutene, preferably hydrogenated polybutene, having a
number-average molecular mass of between 280 and 800 and of 0% to
70% by weight of at least one liquid lubricant chosen from mineral
oils, synthetic oils and silicones and 7 to 20 parts by weight of a
hydrophobic thixotropic agent chosen from a hydrophobic silica and
a hydrophobic bentonite. The use of a polar agent, such as
propylene carbonate, for improving the dispersion of the silicas or
bentonites is disclosed in the patent application. The British
patent application published under the number 2 144 559 discloses
hydrogen-absorbing compositions for optical fibre cables which
comprise polybutene, aromatic hydrocarbons, palladium or active
charcoal. The United States patent published under the U.S. Pat.
No. 4,668,889 discloses hydrogen-absorbing compositions for the
filling of optical fibre cables which comprise the mixture of an
unsaturated silicone with a catalyst chosen from transition metals,
organic salts of transition metals or organometallic compounds of
the said metals and more specifically palladium powder, platinum
powder, nickel powder, iron pentacarbonyl or chloroplatinic acid,
the said metals optionally being supported on inert compounds, such
as animal or vegetable carbon black. The United States patent
published under the U.S. Pat. No. 4,741,592 discloses
hydrogen-absorbing compositions for the filling of optical fibre
cables which comprise the mixture of an unsaturated polymer
obtained by the polymerization of conjugated dienes with a catalyst
chosen from transition metals, organic salts of transition metals
or organometallic compounds of the said metals and more
specifically palladium powder, platinum powder, nickel powder, iron
pentacarbonyl or copper chromite, the said metals optionally being
supported on inert compounds, such as animal or vegetable carbon
black. The European patent application published under the number
EP 0 632 301 discloses hydrogen-absorbing compositions for the
filling of optical fibre cables which comprise the mixture of an
unsaturated hydrocarbonaceous compound, for example polybutene or
propylene-ethylene, propylene-butene and propylene-hexene
copolymers, the propylene-butene-ethylene terpolymer, glyceryl
ricin-oleate or resin oil, with a catalyst chosen from transition
metals, organic salts of transition metals or organometallic
compounds of the said metals and more specifically palladium
powder, platinum powder, nickel powder or iron pentacarbonyl, the
said metals optionally being supported on inert compounds. The
French patent application published under the number 2 763 955
discloses a composition for filling optical fibre cables which
comprises from 75% to 95% by weight of a propoxylated bisphenol
with a molecular weight of less than 3 000, from 5% to 25% by
weight of a thixotropic agent and from 0.1% to 1% by weight of an
antioxidizing agent.
[0004] The palladium-based compounds are provided in the form of
very fine powders with a diameter of approximately ten microns and
with a high specific surface area. In point of fact, these powders
are difficult to disperse homogeneously and have a tendency to form
agglomerates in the greases, which reduces the overall specific
surface area of the catalyst and thus the effectiveness of the
grease in absorbing hydrogen. On the other hand, at equal
effectiveness, a good dispersion of the catalyst in the grease
makes it possible to use smaller amounts of catalyst and thus to
decrease the cost price of these greases. This is why the Applicant
Company has sought to develop novel compositions in which the
catalyst powders are dispersed more homogeneously than in those of
the state of the art.
[0005] A subject-matter of the invention is a composition,
characterized in that it comprises a hydrocarbonaceous and/or
silicone compound or a mixture of hydrocarbonaceous and/or silicone
compounds, a nonzero proportion of one or more transition metals
and a nonzero proportion of at least one slightly polar dispersing
liquid fatty phase, having one or more hydrocarbonaceous chains,
with an HLB of between 0.5 and 9, preferably between 4 and 9.
[0006] The term "hydrocarbonaceous and/or silicone compound or
mixture of hydrocarbonaceous and/or silicone compounds" denotes in
particular hydrocarbons, hydrocarbonaceous polymers, silicone oils
and/or polyol derivatives.
[0007] The composition which is a subject-matter of the present
invention generally comprises from 50% to 90% by weight of
hydrocarbonaceous and/or silicone compound or of mixture of
hydrocarbonaceous and/or silicone compounds.
[0008] Hydrocarbons or hydrocarbonaceous polymers include, for
example, poly-alpha-olefins (PAO) or copolymers of alpha-olefins
comprising from 8 to 12 carbon atoms, polyisobutene (PIB) or
polybutene, obtained by polymerization of isobutene, of 1-butene
and/or of 2-butene, propylene-ethylene, propylene-butene and
propylene-hexene copolymers, propylene-butene-ethylene terpolymers
or polybutadienes. The silicone oils can be chosen from
poly(alkylsiloxanes), in particular poly(dimethylsiloxanes), with
high molecular weights having a viscosity of the order of 10 000 to
30 000 cSt at ambient temperature. The polyol derivatives are
obtained by etherification or esterification of a compound having
several hydroxyl functional groups, such as, for example, glycerol,
TMP or bisphenol, by means of hydrocarbonaceous fatty chains or
alkoxide chains, such as polyethylene glycol, polypropylene glycol
or polybutylene glycol.
[0009] The composition which is a subject-matter of the present
invention also comprises one or more metal catalysts in a
proportion by weight ranging up to 5% by weight of the said
composition. Examples of metal compounds appropriate to the present
invention include, for example, transition metals, organic salts of
transition metals or organometallic compounds of the said metals
and more specifically palladium powder, platinum powder, nickel
powder, iron pentacarbonyl, chloroplatinic acid, copper chromite,
Raney nickel, palladium supported on active charcoal, palladium
supported on alumina, platinum supported on alumina or platinum
supported on active charcoal.
[0010] According to a specific alternative form of the present
invention, the composition comprises up to 1% by weight of
palladium supported on alumina or on active charcoal.
[0011] The composition which is a subject-matter of the present
invention also comprises up to 15% by weight of silica. Hydrophobic
treated silica, such as, for example, Aerosil.TM. R974, can be used
but the preferred silica is hydrophilic silica, for example
hydrophilic pyrogenic silica, such as that sold under the name of
Aerosil.TM. 200, or hydrophilic colloidal silica, such as that sold
under the name of Cab-O-Sil.TM. TS 720.
[0012] The composition which is a subject-matter of the present
invention optionally comprises up to approximately 5% of a
viscosifying polymer. Examples of viscosifying polymer include
styrene, ethylene, propylene, butylene or butadiene polymers or
diblock copolymers of these monomers, such as
polystyrene-polyethylene, polystyrene-[polyethylene+polypropylene],
polystyrene-polyisoprene or polystyrene-polybutene, or triblock
polymers, such as polystyrene-polyethylene-polystyrene,
polystyrene-[polyethylene+polypropylene]-polystyrene,
polystyrene-polyisoprene-polystyrene or
polystyrene-polybutadiene-polystyrene. Polymers of this type are
sold under the trade names Kraton.TM. G or Kraton D, Septon.TM. or
Shellvis.TM..
[0013] The composition which is a subject-matter of the present
invention optionally comprises up to approximately 2% of an
antioxidizing agent chosen, for example, from compounds with a
sterically hindered phenolic structure, such as polymeric
2,2,4-trimethyl-1,2-dihydroquinoline, phenothiazine, octyl
(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, hydroquinone
monomethyl ether or triethylene glycol
bis[3-(3'-tert-butyl-4'-hydroxy-5'-methylphenyl)propionate], sold
under the name of Irganox.TM. 245, or ethylenebis-(oxyethylene)
bis(3-tert-butyl-4-hydroxy-5-methylhydro-cinnamate), Irganox.TM.
1076, or Irganox.TM. 1010.
[0014] The term "slightly polar dispersing liquid fatty phase
having one or more hydrocarbonaceous chains, with an HLB of between
0.5 and 9, preferably between 4 and 9'' is preferably understood to
mean fatty phases which are liquid at ambient temperature.
[0015] The HLB number, or hydrophilic-lipophilic balance, and its
method of determination are known to a person skilled in the art.
This parameter makes it possible to assess the hydrophobic and
hydrophilic natures of a given surface-active agent. In the context
of the present invention, for surface-active agents comprising an
ester functional group, it is determined by the following formula:
HLB=20.times.[1-(SN/AN) in which SN represents the saponification
number of the product, measured according to NFT Standard 60206,
and AN represents the acid number of the precursor acids, measured
according to NFT Standard 60204.
[0016] In the case of surface-active agents comprising an ether
functional group, the HLB is calculated by the equation:
HLB=20.times.(M.sub.h/M) in which M.sub.h is the mass of the
hydrophilic part of the molecule and M is its overall molecular
mass.
[0017] The composition which is a subject-matter of the present
invention comprises from 1% to 20% and preferably between 5% and
10% by weight of dispersing fatty phase.
[0018] According to another specific aspect of the present
invention, the ratio by weight of the metal catalyst or catalysts
to the dispersing fatty phase in the composition is between
approximately 0.01 and 0.20.
[0019] Slightly polar dispersing fatty phase appropriate to the
present invention includes vegetable oils, such as, for example,
sunflower oil, rapeseed oil, maize oil, soybean oil, castor oil,
linseed oil, coconut oil, groundnut oil, olive oil, palm oil or
hydrogenated palm oil, or modified vegetable oils, such as methyl
esters of vegetable oils, monoglycerides or diglycerides obtained
by controlled hydrolysis of vegetable oils, weakly alkoxylated
vegetable oils, in particular weakly ethoxylated and/or
propoxylated vegetable oils, more particularly ethoxylated
vegetable oils comprising from 1 to 10 ethylene oxide units, or
weakly alkoxylated methyl esters of vegetable oils, in particular
weakly ethoxylated and/or propoxylated methyl esters of vegetable
oils and more particularly methyl esters of vegetable oils
ethoxylated with 1 to 4 ethylene oxides. The preparation of these
modified vegetable oils is disclosed in the international patent
applications published under the numbers WO 96/22109 and WO
00/01233.
[0020] The term "weakly alkoxylated" indicates, in the preceding
and in the following, that the alkoxylation number and in
particular the ethoxylation and propoxylation numbers, which
represent respectively the number of ethoxyl units (EO number) and
the number of propoxyl units (PO number) per molecule, is less than
or equal to approximately 15 [EO number=15 or PO number=15 or (EO
number+PO number)=approximately 15].
[0021] Other slightly polar liquid dispersing fatty phase
appropriate to the present invention includes surface-active agents
having an HLB number of between 1 and 9, preferably between 4 and
9, which are miscible with the oils which participate in the
composition of the greases. Examples include linear or branched
fatty alcohols or fatty acids comprising from 5 to 30 carbon atoms
and more particularly from 12 to 22 carbon atoms or the esters of
the said acids, the said alcohols, acids or esters optionally being
weakly alkoxylated. Preference is given, among these, to
surface-active agents which are liquid at ambient temperature, such
as those comprising an oleyl, oleyl/cetyl, linoleyl or behenyl
chain. These compounds are optionally weakly alkoxylated. Examples
of surface-active agents of this nature include sorbitan oleic
esters, oleyl alcohols comprising from 1 to 5 ethylene oxide units
(EO=5), polyethylene glycol (PEG) oleates comprising from 1 to 5
ethylene oxide units (1.ltoreq.EO.ltoreq.5), liquid glucose ethers
or oleic acid comprising from 1 to 5 ethylene oxide units.
[0022] According to another aspect of the present invention, a
subject-matter of the latter is a process for producing the
composition as defined above comprising a stage of dispersing the
catalyst in the dispersing agent as defined above, followed by
mixing the dispersion in the other constituents of the composition
which is a subject-matter of the present invention.
[0023] The process as defined above is a preferred route but it is
possible to mix the dispersing phase with the oils of the grease,
to add the palladium powder and then to add the other
components.
[0024] According to a final aspect of the present invention, a
subject-matter of the latter is the use of the composition as
defined above as composition for filling optical fibre cables.
[0025] The following examples illustrate the invention without,
however, limiting it.
A) Demonstration of the Influence of the Dispersing Fatty Phase on
the Amount of Hydrogen Absorbed by the Composition
[0026] The examples in Tables 1a to 1e are obtained from a model
grease composed of: [0027] 5 or 10% by weight of a dispersing fatty
phase (referred to as DFP) [0028] 3.8% by weight of a viscosifying
polymer (Shellvis.TM. 40), [0029] 6.5% by weight of hydrophilic
silica (Cab-O-Sil.TM. TS 720), [0030] 0.4% of an antioxidant
(Irganox.TM. 1076), [0031] 0.6% of palladium supported on alumina
catalyst, [0032] q.s. for 100% of poly-alpha-olefin (PAO).
[0033] The measured characteristics of the compositions are as
follows: [0034] the volatility, after residence in an oven at
150.degree. C. for 24 h, [0035] the release of oil (exsudation) ,
after residence in an oven at 150.degree. C. for 24 hours, [0036]
the viscosity at a high shear gradient (approximately 2 500 Pas),
measured on a Carrimed viscometer with a cone with a diameter of 2
cm and an angle of 2.degree., [0037] the hydrogen absorption per
gram of grease at 24 hours and at 48 hours, in a cell under an
initial hydrogen pressure of 400 mm of mercury at ambient
temperature.
[0038] The results reveal that all the greases formulated with 5 to
10% of a polar fatty phase have viscosities, exsudations and
volatilities close to those of the control formula but that the
hydrogen absorption is, on the other hand, markedly improved, in
particular when the dispersing fatty phase has an HLB number in the
region of 4 or greater than 4. Additives not possessing a long
hydrocarbonaceous fatty chain, such as oxypropylated bisphenol A
(comparative example), give results which are only slightly better
than those of the control. TABLE-US-00001 TABLE 1a Examples Control
Ex. 1 DFP (nature; amount as %; HLB) None Methyl ester of rapeseed
oil; 5% HLB = 0.5 Volatility 1.17% 4.16% Exsudation 0% 0% Plastic
viscosity 0.90 Pa s at 0.78 Pa s at 2534 Pa 2445 Pa H.sub.2
pressure at T = 0 h 405 mmHg (0) 401 mmHg (0) in mmHg, at T = 24 h
322 mmHg (1.08) 204 mmHg (3.27) H.sub.2 absorption at T = 48 h 321
mmHg (1.39) 174 mmHg (3.76) in ml/g
[0039] TABLE-US-00002 TABLE 1b Examples Ex. 2 Ex. 3 DFP (nature;
amount as %; HLB) Ethoxylated (2 Rapeseed oil; EO) oleyl/cetyl 5%;
alcohol; 5%; HLB = 0.5 HLB = 6 Volatility 2.67% 1.81% Exsudation 0%
0% Plastic viscosity 0.81 Pa s at 0.83 Pa s at 2093 Pa 2394 Pa
H.sub.2 pressure at T = 0 h 406 mmHg (0) 400 mmHg in mmHg, at T =
24 h 277 mmHg (2.14) 304 mmHg (1.59) H.sub.2 absorption at T = 48 h
246 mmHg (2.65) 277 mmHg (2.04) in ml/g
[0040] TABLE-US-00003 TABLE 1c Examples Ex. 4 Ex. 5 DFP (nature;
amount as Ethoxylated (4 Alkoxylated (5 %; HLB) EO) maize oil; 5%;
EO 4 PO 5 EO) HLB = 5 oleic acid; 5%; HLB = 3 Volatility 1.6% 2.01%
Exsudation 0% 0% Plastic viscosity 0.90 Pa s at 0.88 Pa s at 2125
Pa 2494 Pa H.sub.2 pressure at T = 0 h 400 mmHg 405 mmHg in mmHg,
at T = 24 h 304 mmHg (1.7) 299 mmHg (1.76) H.sub.2 absorption at T
= 48 h 277 mmHg (2.24) 291 mmHg (1.89) in ml/g
[0041] TABLE-US-00004 TABLE 1d Examples Ex. 6 Comparative DFP
(nature; amount as Ethoxylated (5 Oxypropylated %; HLB) EO) oleic
acid; 5%; bisphenol A 10%; HLB = 8.7 HLB = 1 Volatility 1.43% 1.71%
Exsudation 0% 0.06% Plastic viscosity 0.90 Pa s at 0.91 Pa s at
2344 Pa 2394 Pa H.sub.2 pressure at T = 0 h 402 mmHg 403 mmHg in
mmHg, at T = 24 h 279 mmHg (2.03) 315 mmHg (1.45) H.sub.2
absorption at T = 48 h 249 mmHg (2.53) 309 mmHg (1.55) in ml/g
[0042] TABLE-US-00005 TABLE 1e Examples Ex. 7 Ex. 8 DFP (nature;
amount as %; HLB) Sorbitan Ethoxylated (10 oleate; 10%; EO) oleic
acid; HLB = 4.3 HLB = 8.7 Volatility 2.22% 2.0% Exsudation 1.94% 0%
Plastic viscosity 0.85 Pa s at 0.89 Pa s 1994 Pa H.sub.2 pressure
at T = 0 h 403 mmHg 401 mmHg in mmHg, at T = 24 h 284 mmHg (1.97)
255 mmHg (2.4) H.sub.2 absorption at T = 48 h 249 mmHg (2.54) 221
mmHg (2.97) in ml/g
B) Demonstration of the Influence of the Catalyst/Dispersing Fatty
Phase Ratio by Weight on the Amount of Hydrogen Absorbed by the
Composition
[0043] The examples in Tables 2a to 2c are obtained from a model
grease composed of: [0044] 5% by weight of ethoxylated (5 EO) oleic
acid with an HLB of 8.7, [0045] 3.8% by weight of a viscosifying
polymer (Shellvis.TM. 40), [0046] 6.5% by weight of hydrophilic
silica (Cab-O-Sil.TM. TS720), [0047] 0% to 0.6% of palladium
supported on alumina catalyst, [0048] q.s. for 100% of
poly-alpha-olefin (PAO).
[0049] In all cases, the amounts of hydrogen absorbed in 48 h are
greater than those absorbed by the control not comprising
dispersing phase while comprising 0.6% of catalyst. TABLE-US-00006
TABLE 2a Examples Control Ex. 9 Catalyst/DFP ratio by weight 0 0.04
Catalyst (% by weight) 0% Pd/Al.sub.2O.sub.3; 0.20% Volatility 1.3%
1.3% Exsudation 0% 0% Plastic viscosity 0.90 Pa s at 0.90 Pa s at
2344 Pa 2344 Pa H.sub.2 pressure at T = 0 h 403 mmHg (0) 402 mmHg
(0) in mmHg, at T = 48 h 402 mmHg (0) 295 mmHg (1.78) H.sub.2
absorption in ml/g
[0050] TABLE-US-00007 TABLE 2b Examples Ex. 10 Ex. 11 Catalyst/DFP
ratio by weight 0.08 0.12 Catalyst (% by weight)
Pd/Al.sub.2O.sub.3; 0.40% Pd/Al.sub.2O.sub.3; 0.60% Volatility 1.9%
1.9% Exsudation 0% 0% Plastic viscosity 0.90 Pa s at 0.90 Pa s at
2344 Pa 2344 Pa H.sub.2 pressure at T = 0 h 403 mmHg (0) 402 mmHg
(0) in mmHg, at T = 48 h 244 mmHg (2.59) 173 mmHg (3.78) H.sub.2
absorption in ml/g
[0051] TABLE-US-00008 TABLE 2c DFP-free Examples Ex. 12 control
Catalyst/DFP ratio by weight 0.06% 8 Catalyst (% by weight)
Pd/Al.sub.2O.sub.3; 0.30% Pd/Al.sub.2O.sub.3; 0.60% Volatility
1.43% 1.17% Exsudation 0% 0% Plastic viscosity 0.90 Pa s at 0.90 Pa
s at 2344 Pa 2344 Pa H.sub.2 pressure at T = 0 h 401 mmHg (0) 405
mmHg (0) in mmHg, at T = 48 h 221 mmHg (2.97) 321 mmHg (1.39)
H.sub.2 absorption in ml/g
[0052] The examples in Tables 3a to 3c are obtained from a model
grease composed of: [0053] 10% by weight of vegetable oil (HLB
0.5), [0054] 3.8% by weight of a viscosifying polymer (Shellvis.TM.
40), [0055] 6.5% by weight of hydrophilic silica (Cab-O-Sil.TM.
TS720), [0056] 0% to 0.3% of palladium supported on alumina
catalyst, [0057] q.s. for 100% of poly-alpha-olefin (PAO).
[0058] In all cases where the catalyst/DFP ratio by weight is
greater than 0.01, the amounts of hydrogen absorbed in 48 h are
greater than those absorbed by the control not comprising
dispersing phase while comprising 0.6% of catalyst. TABLE-US-00009
TABLE 3a Examples Control Ex. 13 Catalyst/DFP ratio by weight 0
0.01 Catalyst (% by weight) 0% Pd/Al.sub.2O.sub.3; 0.10% Volatility
1.8% 1.8% Exsudation 0% 0% Plastic viscosity 0.87 Pa s at 0.89 Pa s
at 2550 Pa 2556 Pa H.sub.2 absorption at T = 0 h 0 0 in ml/g at T =
48 h 0.05 0.98
[0059] TABLE-US-00010 TABLE 3b Examples Ex. 14 Ex. 15 Catalyst/DFP
ratio by weight 0.02 0.03 Catalyst (% by weight)
Pd/Al.sub.2O.sub.3; 0.20% Pd/Al.sub.2O.sub.3; 0.30% Volatility 1.8%
1.8% Exsudation 0% 0% Plastic viscosity 0.88 Pa s at 0.87 Pa s at
2550 Pa 2560 Pa H.sub.2 absorption at T = 0 h 0 0 in ml/g at T = 48
h 1.9 2.3
[0060] TABLE-US-00011 TABLE 3c DFP-free Examples Ex. 16 control
Catalyst/DFP ratio by weight 0.06% 8 Catalyst (% by weight)
Pd/Al.sub.2O.sub.3; 0.60% Pd/Al.sub.2O.sub.3; 0.60% Volatility 1.8%
1.17% Exsudation 0% 0% Plastic viscosity 0.83 Pa s at 0.90 Pa s at
2394 Pa 2344 Pa H.sub.2 absorption at T = 0 h 0 0 in ml/g at T = 48
h 2 1.4
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