Patent ID: 6623399
Filing Date: 2003-09-23
Classification: C08G,C10M,C10N

Abstract:
A method for transmitting torque in a traction drive system having at least two relatively rotatable members in a torque transmitting relationship comprising disposing on the tractive surfaces of the members a traction fluid comprising at least one siloxane composition chosen from(I) 33 to 80 mole percent units of formula (R3SiO1/2), 0.2 to 66.8 mole percent units of formula (RSiO3/2), and 66.8 to 0.2 mole percent units of formula (SiO4/2) having a viscosity of from 1.0 to 50,000 mPaÂ·s at 40Â° C., where each R is independently selected from alkyl groups comprising 1 to 18 carbon atoms and aryl groups comprising 6 to 18 carbon atoms provided from 10 to 70 mole percent of R groups are not methyl; (II) 33 to 75 mole percent units of formula (R3SiO1/2) and 67 to 25 mole percent units of formula (RSiO3/2) having a viscosity of from 2.0 to 20,000 mPaÂ·s at 40Â° C., where each R is independently selected from alkyl groups comprising 1 to 18 carbon atoms and aryl groups comprising 6 to 18 carbon atoms provided from 10 to 70 mole percent of R groups are not methyl; (III) 33 to 80 mole percent units of formula (R3SiO1/2) and 67 to 20 mole percent units of formula (SiO4/2) having a viscosity of from 1.0 to 70,000 mPaÂ·s at 40Â° C., where each R is independently selected from alkyl groups comprising 1 to 18 carbon atoms and aryl groups comprising 6 to 18 carbon atoms provided from 10 to 70 mole percent of R groups are not methyl; (IV) 0 to 28 mole percent units of formula (R3SiO1/2), 37 to 93 mole percent units of formula (R2SiO2/2), and 6 to 56 mole percent units of formula (RSiO3/2) having a viscosity of from 5.0 to 10,000 mPaÂ·s at 40Â° C. , where each R is independently selected from alkyl groups comprising 1 to 18 carbon atoms and aryl groups comprising 6 to 18 carbon atoms provided from 10 to 70 mole percent of R groups are not methyl and provided further that at least one of the R groups which is not methyl is chosen from alkyl groups comprising 7 to 18 carbon atoms and aryl groups comprising 7 to 18 carbon atoms; (V) 1 to 100 mole percent units of formula (R3SiO1/2) and 99 to 0 mole percent units of formula (R2SiO2/2) having a viscosity of from 1.0 to 50,000 mPaÂ·s at 40Â° C., where each R is independently selected from alkyl groups comprising 1 to 18 carbon atoms and aryl groups comprising 6 to 18 carbon atoms provided from 10 to 70 mole percent of R groups are not methyl and provided further that at least one of the R groups which is not methyl is chosen from alkyl groups comprising 7 to 18 carbon atoms and aryl groups comprising 7 to 18 carbon atoms; and (VI) cyclosiloxanes of formula (R2SiO2/2)a having a viscosity of from 2.0 to 50,000 mPaÂ·s at 40Â° C., where a is an integer ranging from 3 to 20, each R is independently selected from alkyl groups comprising 1 to 18 carbon atoms and aryl groups comprising 6 to 18 carbon atoms provided from 10 to 70 mole percent of R groups are not methyl.