Mineral or synthetic, hydrogen-based greases, having improved properties

A method for improving the minium working temperature and maximum working temperature of greases containing a lubricating oil selected from the group consisting of a hydrocarbon based mineral oil, an animal oil or vegetable oil, polyesters, polyalphaolefins, silicone, and polyglycols;

• comprising adding thereto a fluoropolyethereal oil and an organic or inorganic thickening agent, the weight ratio of the lubricating oil+fluoropolyethereal oil/thickening agent ranges from 97:3 to 80:20 and the weight ratio of lubricating oil/fluoropolyethereal oil ranges from 95:5 to 60:40, and said fluoropolyethereal oil has a viscosity range from 10 to 4000 cst and are selected from the following structures:
• ##STR6## wherein X is --F, --CF.sub.3 ;
• A' and A are the same or different from each other and are --CF.sub.3, ##STR7## wherein T is H or Cl, the units (CF.sub.2 CF(CF.sub.3)O) and (CFXO) are statistically distributed along the perfluoropolyethereal chain, m and n are integers wherein the ratio of m/n is 20-1000;
• ##STR8## wherein B is CF.sub.3 --C.sub.2 F.sub.5, --C.sub.3 F.sub.7, and m' is a positive integer;
• ##STR9##
• wherein m" is an integer;
• 4. A"O›CF.sub.2 CF(CF.sub.3)O!.sub.q' (C.sub.2 F.sub.4 O).sub.s' (CFXO).sub.r' A"'
• wherein A" and A"' are the same or different and are selected from the group consisting of CF.sub.3, C.sub.2 F.sub.5, C.sub.3 F.sub.7 ;
• X is F, CF.sub.3 ;
• r', q' and s' are integers and can be also equal to 0, with the proviso that the viscosity of the perfluoropolyether is within the range indicated above;
• the ratios r'/(r'+s'+q').ltoreq.1/10;
• q'/s' is between 0.2 to 6;
• 5. CF.sub.3 O(C.sub.2 F.sub.4 O).sub.p (CF.sub.2 O).sub.q --CF.sub.3
• wherein p and q are integers which are the same or different and with the proviso that the p/q ratio is comprised between 0.1 and 5 and such that the viscosity is within the limits above indicated;
• 6. A.sup.iv O--›CF.sub.2 CF.sub.2 CF.sub.2 O).sub.m"' A.sup.v
• wherein A.sup.iv and A.sup.v, are the same or different and are selected from the group consisting of C.sub.2 F.sub.5, C.sub.3 F.sub.7 and m"' is an integer;
• 7. DO--(CF.sub.2 --CF.sub.2 O).sub.r D'
• wherein D and D' are the same or different and are selected from the group consisting of CF.sub.3, C.sub.2 F.sub.5, and r is an integer;
• ##STR10## wherein R'.sub.f is a perfluoroalkyl, R.sub.f is F or a perfluoroalkyl, n' is an interger.