Abstract: Method of X-raying animals using as a contrast agent a perfluorobromoalkyl ether of the formula C.sub.m F.sub.2m+1 OC.sub.n F.sub.2n Br where m and n independently are integers of from 2 to 6, wherein the ether is used either neat or in an aqueous dispersion such as an emulsion.

Abstract: Fluorinated phosphines having the general formula ##STR1## wherein R.sub.f OR.sub.f -- is a perfluoroalkylether group containing at least one ether linkage are useful as antioxidation additives for perfluorinated fluids.

Abstract: A lubricant composition comprising a base fluid having the general formulaF[CF(CF.sub.3)CF.sub.2 O].sub.n CHFCF.sub.3wherein n is an integer, and a corrosion inhibiting amount of an aromatic phosphine with perfluorinated polyalkylether substituents having the general formula ##STR1## wherein R.sub.f OR.sub.f -- is a perfluoroalkylether group containing at least one ether linkage.

Abstract: A lubricant composition comprising a base fluid having the general formulaR.sub.f O(CF.sub.2 CF.sub.2 O).sub.m (CF.sub.2 O).sub.n R.sub.fwherein R.sub.f is CF.sub.3 or C.sub.2 F.sub.5, m and n are integers whose sum is between 2 and 200, and the ratio of m to n is between 0.1 and 10, and a corrosion inhibiting amount of an aromatic phosphine with perfluorinated polyalkylether substituents having the general formula ##STR1## wherein R.sub.f OR.sub.f - is a perfluoroalkylether group containing at least one ether linkage.

Abstract: A lubricant composition comprising a base fluid having the general formulaC.sub.3 F.sub.7 [CF(CF.sub.3)CF.sub.2 O].sub.n CF.sub.2 CF.sub.3wherein n has a value ranging from 5 to 50, and a corrosion-inhibiting amount of an aromatic phosphine with perfluorinated polyalkylether substituents having the general formula ##STR1## wherein R.sub.f OR.sub.f -- is a perfluoroalkylether group containing at least one ether linkage.

Abstract: A grease composition comprising a major amount of a polyfluoroalkylether base fluid of the general formulaC.sub.3 F.sub.7 [CF(CF.sub.3)CF.sub.2)].sub.n CF.sub.2 CF.sub.3 (a)wherein n is an integer having a value in the range of 5 to 50, orF[CF(CF.sub.3)CF.sub.2 O].sub.p CHFCF.sub.3 (b)wherein p is an integer having a value of 1 to 17, a minor amount of a thickener and an oxidation inhibiting amount of a perfluoroalkylether phenylphosphine of the general formula(O).sub.a --P--Ar-CF.sub.2 -R.sub.f OR.sub.f).sub.3wherein a has a value of zero or 1, Ar is a phenylene or perfluorophenylene group, and --R.sub.f OR.sub.f is a perfluoroalkylether group containing at least one ether linkage.

Abstract: A grease composition comprising a major amount of a polyfluoroalkylether base fluid of the general formulaAO(CF.sub.2 CF.sub.2 O).sub.m (CF.sub.2 O).sub.n Bwherein A and B are --CF.sub.3 or --C.sub.2 F.sub.5, and m and n are integers and the sum of m+n is between 2 and 200 and the ratio n/m is in the range of 0.1:1 to 10:1, a minor amount of a thickener and an oxidation inhibiting amount of a perfluoroalkylether phenylphosphine of the general formula ##STR1## wherein a has a value of zero or 1, Ar is a phenylene or perfluorophenylene group, and --R.sub.f OR.sub.f is a perfluoroalkylether group containing at least one ether linkage.

Abstract: A mixture of tetraalkylsilanes is prepared by reacting a mixture of at least two organometallic compounds with a silicon tetrahalide or an alkyl silicon trihalide. The mixture of silanes is useful as a hydraulic fluid.

Abstract: An antirust, anticorrosion grease composition comprising a major amount of a fluorinated polysiloxane base fluid, a minor amount of a fluorocarbon polymer thickening agent, and a rust and corrosion inhibiting amount of a benzimidazole.

Abstract: An antirust, anticorrosion grease composition comprising a major amount of a polyfluoroalkylether base fluid, a minor amount of a fluorocarbon polymer thickening agent, and a rust and corrosion inhibiting amount of a benzimidazole.

Abstract: Benzimidazoles substituted in the 2-position with a perfluoroalkyleneether radical. The compounds are useful as antirust and anticorrosion additives in grease formulations based on fluorine-containing fluids.

Abstract: An antirust, anticorrosion grease composition comprising a major proportion of a perfluorinated polyalkylether base fluid, a minor proportion of a fluorocarbon polymer thickening agent, and a rust and corrosion inhibiting amount of a fluorine-containing benzoxazole.

Abstract: Benzoxazoles substituted in the 2-position with a perfluoroalkylether radical and bis-benzoxazoles in which the 2-position carbon atoms of the benzoxazole rings are attached to one another with a perfluoroalkylene or perfluoroalkyleneether radical. The compounds are useful as anti-rust additives in grease formulations based on fluorine-containing fluids.

Abstract: A lubricant composition comprising (1) a base fluid having the following formula:R.sub.f O(CF.sub.2 CF.sub.2 O).sub.m (CF.sub.2 O).sub.n R.sub.f,wherein R.sub.f is a perfluoroalkyl group, m and n are integers whose sum is between 2 and 200 and the ratio of n to m is between 0.1 and 10; and (2) a minor amount of a perfluoroalkylether substituted aryl phosphine.

Abstract: Omega-carbomethoxyperfluoroalkylene ether iodides are reacted with metallic zinc to yield alpha-omega perfluoroalkyleneether diesters. The diesters are reacted with ammonia to form diamides, the diamides are reacted with phosphorus pentoxide to form dinitriles, and the dinitriles are esterified with methanol to form diimidate esters. The diimidate esters are particularly useful as monomers in synthesizing perfluoroalkylene ether bibenzoxazole polymers possessing thermooxidative stability and outstanding low temperature viscoelastic properties.

Abstract: A lubricant comprising a perfluorinated polyalkylether base fluid and a minor amount of a perfluoroalkylether substituted aryl phosphine.

Abstract: Fluorinated ethers are provided that contain two functional end groups (ester and iodide groups) separated by a plurality of difluoromethylene, fluoro-trifluoromethylmethylene and oxygen groups. The compounds are useful as intermediates, particularly in the synthesis of fluoroalkylether difunctional compounds which can be used in the preparation of improved thermally stable polymers.

Abstract: Omega-carbomethoxyperfluoroalkylene ether iodides are reacted with metallic zinc to yield alpha-omega perfluoroalkyleneether diesters. The diesters are reacted with ammonia to form diamides, the diamides are reacted with phosphorus pentoxide to form dinitriles, and the dinitriles are esterfied with methanol to form diimidate esters. The diimidate esters are particularly useful as monomers in synthesizing perfluoroalkylene ether bibenzoxazole polymers possessing thermooxidative stability and outstanding low temperature viscoelastic properties.

Abstract: Fluorinated phosphines having the following formula: ##STR1## , where R is a perfluoroalkylether group of fluorine with two of the R's being fluorine, and n is 1, 2 or 3. The fluorinated phosphines are especially useful as anticorrosion and antioxidation additives for perfluorinated fluids.