Hydrocarbonoxy-containing silicone fluids useful as hydraulic fluids

• US 4,056,546 A
• Filed: 07/30/1976
• Issued: 11/01/1977
• Est. Priority Date: 05/24/1972
• Status: Expired due to Term

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Brown, Edgar D. Jr.
• Primary Examiner(s): Pitlick, Harris A.
• Application Number:
  US05/710,090
• Time in Patent Office: 459 Days
• Field of Search: 252/78.3, 252/49.6, 260/448.8 R, 260/448.2 E
• US Class Current: 556/446
• CPC Class Codes: C08G 77/04 Polysiloxanes
• CPC Class Codes: C10M 2201/02 Water
• CPC Class Codes: C10M 2215/042 containing hydroxy groups; Alkoxylated derivatives thereof
• CPC Class Codes: C10M 2215/062 containing hydroxy groups bound to the aromatic ring
• CPC Class Codes: C10M 2215/066 Arylene diamines
• CPC Class Codes: C10M 2215/16 Nitriles
• CPC Class Codes: C10M 2229/045 containing silicon-to-hydroxyl bonds
• CPC Class Codes: C10M 2229/046 containing silicon-oxygen-carbon bonds
• CPC Class Codes: C10M 2229/047 containing alkylene oxide groups
• CPC Class Codes: C10M 2229/048 containing carboxyl groups
• CPC Class Codes: C10M 2229/05 containing atoms other than silicon, hydrogen, oxygen or carbon
• CPC Class Codes: C10M 2229/051 containing halogen
• CPC Class Codes: C10M 2229/052 containing nitrogen
• CPC Class Codes: C10M 3/00 Liquid compositions essentially based on lubricating components other than mineral lubricating oils or fatty oils and their use as lubricants; Use as lubricants of single liquid substances compositions in general essentially based on macromolecular compounds C08L
• CPC Class Codes: C10N 2020/01 Physico-chemical properties
• CPC Class Codes: C10N 2040/06 Instruments or other precision apparatus, e.g. damping fluids
• CPC Class Codes: C10N 2040/08 Hydraulic fluids, e.g. brake-fluids

Abstract

A silicone polymer fluid useful as a brake fluid comprising a polymer or monomer having 0 to 100 mole percent of polymeric or monomeric units selected from R₂ Si(OM)₂ units, ##STR1## AND R₂ SiO units, 0 to 100 mole percent of polymeric and monomeric units selected from RSi(OM)₃ units, ##STR2## AND RSiO_3/2 units, 0 to 10 mole percent of units selected from the class consisting of (MO)₃ SiO_1/2 units, (MO)₂ SiO units, (MO)SiO_3/2 units and SiO₂ units and 0 to 5 mole percent of units selected from R₃ SiO_1/2 units wherein the viscosity of the polymer may vary from 2 to 400 centistokes at 25° R is a monovalent hydrocarbon radical, M is selected from alkyl, alkoxy, alkylene, alkoxyalkyleneoxyalkylene and alkyl polyether substituent radicals, wherein the preferred substituent for M is 2-methoxy-2-ethoxy-ethylene or higher and R is preferably methyl.

Claims

1. A silicone fluid useful as a hydraulic fluid consisting essentially of a polymer having 75 to 95 mole percent by weight of polymeric units selected from the class consisting of from ##STR22## and R₂ SiO units and mixtures thereof, 5 to 25 mole percent of polymeric units selected from the class consisting of ##STR23## and RSiO_3/2 units and mixtures thereof with trace amounts of other units selected from the class consisting of (MO)₃ SiO_1/2 units, (MO)₂ SiO units, MOSiO_3/2 units, SiO₂ units and R₃ SiO_3/2 units and substantially free of disiloxanes, wherein the molar amount of MO groups present based on the total moles of R and MO groups present may vary from 5 to 95 mole percent, wherein the viscosity of the polymer may vary from 2 to 400 centistokes at 25°

C, R is a lower alkyl radical, M is selected from the class consisting of ROR'"'"'--, ROR'"'"'OR'"'"'--, and R(OC_x H_2x)_n -- such that R is as previously defined, R'"'"' is selected from the class consisting of alkylene and arylene radicals of 1 to 10 carbon atoms, x varies from 2 to 4 and n varies from 4 to 100.

2. The silicone fluid of claim 1 wherein R is selected from methyl.

3. The silicone fluid of claim 1 wherein there is present in said fluid polymer 20% by weight to 48% by weight of MO groups based on the total weight of the fluid.

4. The silicone fluid of claim 1 wherein R is lower alkyl having from 1 to 8 carbon atoms.

5. The silicone fluid of claim 1 wherein M is 2-methoxy-2-ethoxy ethylene and R is methyl.