Lubricant compositions for power transmitting fluids
An additive composition may comprise at least one phosphorus- and boron-containing dispersant, at least one boron-containing dispersant, and at least one detergent. Such composition may be useful in power transmissions to provide improved anti-shudder performance and/or improved friction durability.
1 . An additive composition comprising:
(a) at least one first phosphorus- and boron-containing dispersant in an amount of about 20 wt % or more in the additive composition;
(b) at least one second boron-containing dispersant, free of phosphorus; and
(c) at least one detergent.
2 . The additive composition of claim 1 , wherein the first dispersant comprises a phosphorylated and boronated polyisobutylene succinimide, bis-succinimide, or mixture thereof.
3 . The additive composition of claim 2 , wherein the polyisobutylene has a molecular weight of about 900 amu.
4 . The additive composition of claim 1 , wherein the second dispersant comprises a boronated polyisobutylene succinimide, bis-succinimide, or mixture thereof.
5 . The additive composition of claim 4 , wherein the polyisobutylene has a molecular weight of about 900 amu to about 1300 amu.
6 . The additive composition of claim 1 , wherein the detergent comprises an overbased detergent.
7 . The additive composition of claim 1 , wherein the detergent comprises a sulfonate or a phenate.
8 . The additive composition of claim 1 , wherein the detergent comprises one or more of calcium sulfonate, magnesium sulfonate, sodium sulfonate, calcium phenate, and zinc phenate.
9 . The additive composition of claim 1 , wherein the detergent comprises a calcium sulfonate having about 1.5 wt % to about 20 wt % calcium.
10 . The additive composition of claim 1 , wherein the calcium sulfonate comprises a TBN of about 250 mgKOH/g to about 450 mgKOH/g.
11 . The additive composition of claim 1 , wherein the detergent comprises a calcium phenate having about 2.5 wt % to about 8.5 wt % calcium.
12 . The additive composition of claim 1 , wherein the detergent comprise a calcium phenate having a TBN of about 50 mgKOH/g to about 300 mgKOH/g.
13 . The additive composition of claim 1 , further comprising one or more of an antioxidant, an extreme pressure additive, a corrosion inhibitor, an antiwear additive, a metal deactivator, an antifoam agent, a viscosity index improver, a pour point depressant, an air entrainment additive, a metallic detergent, and a seal swell agent.
14 . The additive composition of claim 1 , wherein the additive composition is suitable for use in a transmission employing one or more of a slipping torque converter, a lock-up torque converter, a starting clutch and one or more shifting clutches.
15 . The additive composition of claim 14 , wherein the additive composition is suitable for use in a belt, chain, or disk-type continuously variable transmission.
16 . A power transmitting fluid, comprising:
(a) a major amount of a base oil; and
(b) an additive composition comprising
(i) at least one first phosphorus- and boron-containing dispersant in an amount of about 2.0 wt % or more in the fluid;
(ii) at least one second boron-containing dispersant, free of phosphorus; and
(iii) at least one detergent.
17 . The power transmitting fluid of claim 16 , wherein the first dispersant comprises a phosphorylated and boronated polyisobutylene succinimide, bis-succinimide, or mixture thereof.
18 . The power transmitting fluid of claim 17 , wherein the polyisobutylene has a molecular weight of about 900 amu.
19 . The power transmitting fluid of claim 16 , wherein the second dispersant comprises a boronated polyisobutylene succinimide, bis-succinimide, or mixture thereof.
20 . The power transmitting fluid of claim 19 , wherein the polyisobutylene has a molecular weight of about 900 amu to about 1300 amu.
21 . The power transmitting fluid of claim 16 , wherein the detergent comprises an overbased detergent.
22 . The power transmitting fluid of claim 16 , wherein the detergent comprises a sulfonate or a phenate.
23 . The power transmitting fluid of claim 16 , wherein the detergent comprises one or more of calcium sulfonate, magnesium sulfonate, sodium sulfonate, calcium phenate, and zinc phenate.
24 . The power transmitting fluid of claim 16 , wherein the detergent comprises a calcium sulfonate having about 1.5 wt % to about 20 wt % calcium.
25 . The power transmitting fluid of claim 16 , wherein the calcium sulfonate comprises a TBN of about 250 mgKOH/g to about 400 mgKOH/g.
26 . The power transmitting fluid of claim 16 , wherein the detergent comprises a calcium phenate having about 2.5 wt % to about 8.5 wt % calcium.
27 . The power transmitting fluid of claim 16 , wherein the detergent comprise a calcium phenate having a TBN of about 50 mgKOH/g to about 300 mgKOH/g.
28 . The power transmitting fluid of claim 16 , further comprising one or more of an antioxidant, an extreme pressure additive, a corrosion inhibitor, an antiwear additive, a metal deactivator, an antifoam agent, a viscosity index improver, a pour point depressant, an air entrainment additive, a metallic detergent, and a seal swell agent.
29 . The power transmitting fluid of claim 16 , wherein the additive composition is suitable for use in a transmission employing one or more of a slipping torque converter, a lock-up torque converter, a starting clutch and one or more shifting clutches.
30 . The power transmitting fluid of claim 29 , wherein the additive composition is suitable for use in a belt, chain, or disk-type continuously variable transmission.
31 . A continuously variable transmission fluid comprising
(a) a major amount of a base oil; and
(b) an additive composition comprising
(i) at least one first phosphorus- and boron-containing dispersant in an amount of about 2.0 wt % or more in the fluid;
(ii) at least one second boron-containing dispersant, free of phosphorus; and
(iii) at least one detergent.
32 . A method of increasing steel-on-steel friction comprising:
lubricating a transmission having steel-on-steel friction with a lubricating composition comprising a major amount of a base oil and an additive composition comprising:
(a) at least one first phosphorus- and boron-containing dispersant in an amount of about 2.0 wt % or more in the fluid;
(b) at least one second boron-containing dispersant, free of phosphorus; and
(c) at least one detergent.
33 . A method of improving anti-shudder comprising:
lubricating a transmission having shudder with a lubricating composition comprising a major amount of a base oil and an additive composition comprising:
(a) at least one first phosphorus- and boron-containing dispersant in an amount of about 2.0 wt % or more in the fluid;
(b) at least one second boron-containing dispersant, free of phosphorus; and
(c) at least one detergent.
34 . A method of stabilizing steel-on-paper friction comprising:
lubricating a transmission having steel-on-paper friction with a lubricating composition comprising a major amount of a base oil and an additive composition comprising:
(a) at least one first phosphorus- and boron-containing dispersant in an amount of about 2.0 wt % or more in the fluid;
(b) at least one second boron-containing dispersant, free of phosphorus; and
(c) at least one detergent.