A copolymer of polyalkylphenyl siloxane and alkylfluoroalkyl siloxane obtainable by reacting a dispersion of ingredient (i) an alkylfluoroalkyl siloxane and ingredient (ii) one or more polyalkylphenyl siloxane(s) in the presence of ingredient (iii) a basic catalyst at a temperature of between 40 C. to 300 C.

A copolymer of polyalkylphenyl siloxane and alkylfluoroalkyl siloxane obtainable by reacting a dispersion of ingredient (i) an alkylfluoroalkyl siloxane and ingredient (ii) one or more polyalkylphenyl siloxane(s) in the presence of ingredient (iii) a basic catalyst at a temperature of between 40 C. to 300 C.

A method of using lubricant compositions to reduce wear between two surfaces exposed to a load condition of at least 1 GPa is provided. The lubricant compositions comprise polysiloxane base oils having alkylaryl or a combination of alkyl and aryl functionality. The polysiloxane base oils may be defined according to the formula: ##STR00001##
wherein R, R, and R are independently selected, such that R is an alkyl group having between 1-3 carbon atoms; R is an alkylaryl group comprising alkyl functionality with 3-12 carbon atoms and aryl functionality with 6 to 12 carbon atoms; R is an alkyl group having between 1-3 carbon atoms or an alkylaryl group comprising alkyl functionality with 3-12 carbon atoms and aryl functionality with 6 to 12 carbon atoms; and m and n are integers, such that 8<(m+n)<500.

The present disclosure relates to polysiloxanes, processes for preparing polysiloxanes, and hydraulic fluids comprising polysiloxanes. This disclosure also relates to hydraulic fluids comprising one or more polysiloxane compounds and diphosphonate compounds, and to the use of diphosphonate compounds in hydraulic fluids or as additives or components in various compositions, for example to provide fire retardant properties to a fluid or composition. This disclosure also relates to use of the compositions as hydraulic fluids, which may be used in various machines, vehicles and craft, including aircraft.

Disclosed herein are biodegradable compositions comprising 1,3-propanediol, wherein the 1,3-propanediol in said biodegradable composition has a bio-based carbon content of about 1% to 100%. In addition, it is preferred that the 1,3-propanediol be biologically-derived, and wherein upon biodegradation, the biologically-derived 1,3-propanediol contributes no anthropogenic CO2 emissions to the atmosphere.

Biodegradable pharmaceutical compositions comprising 1,3-propanediol and its esters are provided. The 1,3-propanediol and its esters in the pharmaceutical composition are biologically derived, and as such, the pharmaceutical compositions exhibit a low anthropogenic CO.sub.2 emission profile.

The present disclosure relates to polysiloxanes, processes for preparing polysiloxanes, and hydraulic fluids comprising polysiloxanes. This disclosure also relates to hydraulic fluids comprising one or more polysiloxane compounds and diphosphonate compounds, and to the use of diphosphonate compounds in hydraulic fluids or as additives or components in various compositions, for example to provide fire retardant properties to a fluid or composition. This disclosure also relates to use of the compositions as hydraulic fluids, which may be used in various machines, vehicles and craft, including aircraft.

Lubricating compositions are provided. The lubricating compositions can include a lubricating agent, a flexibilizer, a dispersing agent, and a charge imparting agent. The lubricating compositions can optionally include a carrier.

New compositions of matter that provide lubricant properties when cured into a coating on a substrate. The compositions are low molecular weight structured polysilicate compositions that have high silanol contents. The polysilicates are combined with a condensation catalyst and allowed to cure on the appropriate substrate. The cured coating has lubricant properties.

The invention provides a silicone grease composition where the high friction properties are improved, with no decrease of the wear preventive characteristics. The silicone grease composition contains a thickener, a base oil containing a silicone oil in an amount of 50 mass % or more of the total mass of the base oil, and a metallic oxide with a Mohs hardness of 6 or less as a friction modifier.