Silicone compositions useful as green tire lubricants
AssigneeGeneral Electric Company
InventorsGordon T. VanVleck, Frank J. Traver
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Abstract
An improved process for producing a silicone composition useful as a green tire lubricant with improved lubricity properties comprising mixing initially the diorganopolysiloxane with a mica filler to form a homogeneous mixture and then subsequently adding to this mixture the other necessary ingredients such as a polyol, a mineral clay, an emulsifying agent and finally adding water and mixing the mixture to produce a dispersion. There is a second improved process in accordance with the present invention in which the viscosity of the final green tire lubricant mixture irrespective of how it is prepared is decreased by the addition of buffering agents.
Claims21
A process for producing a silicone composition useful as a green tire lubricant with improved lubricity properties comprising:
- a. mixing 20 to 55 parts by weight of a mica filler with 2 to 20 parts by weight of a linear diorganopolysiloxane of a viscosity varying from 500 to 200,000 centipoise at 25.degree. C where the organo group is selected from the class consisting of monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals to form a homogeneous mixture;
- b. adding to said mixture 2 to 20 parts by weight of an alkylene oxide polyol, 0.05 to 10 parts by weight of a mineral clay and 0.05 to 10 parts by weight of a first emulsifying agent selected from the class consisting of anionic, cationic and non-ionic emulsifying agents and forming a second mixture and
- c. adding to said second mixture sufficient water to form an emulsion after the second mixture is thoroughly mixed with said added water.
A process for controlling the viscosity of a silicone composition useful as a green tire lubricant comprising,
- a. mixing from 20 to 55 parts by weight of a mica filler with 2 to 20 parts by weight of linear diorganopolysiloxane having a viscosity varying from 500 to 200,000 centipoise at 25.degree. C where the organo group is selected from the class consisting of monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals and with 2 to 20 parts by weight of an alkylene oxide polyol, 0.05 to 10 parts by weight of a mineral clay, 0.05 to 10 parts by weight of an emulsifying agent selected from the class consisting of anionic, cationic and non-ionic emulsifying agents and 10 to 60 parts of water to form an emulsion, and
- b. adding an effective amount of a buffering agent to the emulsion so as to reduce the viscosity to the desired level.
Dependencies are inferred from the claim text.