Abstract: A fluorine-containing uridine derivative of the formula: ##STR1## wherein R is lower acyl, fluorine-containing lower acyl or fluorine-containing lower alkyl; and X is hydrogen or hydroxyl, which is prepared by a process which comprises fluorinating 2', 3'-O-isopropylideneuridine with fluorine in a solvent selected from the group consisting of lower carboxylic acids, fluorine-containing lower carboxylic acids and fluorine-containing lower alcohols, and is converted to a 5-fluorouridine derivative of the formula: ##STR2## wherein R and X are as defined above by reacting the fluorine-containing uridine derivative of the formula (I) with a base in an organic solvent at a temperature of 0.degree. to 80.degree. C.

Abstract: A method for preparing lower alkyl .alpha.-fluoro-.alpha.-cyanoacetate and its carbanion by reacting hexafluoropropene with ammonia, and then reacting the obtained product with an alkali hydroxide in a lower alkyl alcohol. The carbanion is prepared by reacting the product .alpha.-fluoro-.alpha.-cyanoacetate with an alkali fluoride.

Abstract: A resist material of positive type having a high sensitivity, a high resolving power and an excellent adhesion property to substrates, which comprises a copolymer of a fluoroalkyl acrylate having the general formula: ##STR1## wherein R.sub.1 is methyl group, ethyl group, a halogen-substituted methyl or ethyl group, a halogen atom or hydrogen atom, R.sub.2 is a bivalent hydrocarbon group having 1 to 6 carbon atoms, and R.sub.f is a fluoroalkyl group having 1 to 15 carbon atoms, with an acrylic comonomer selected from the group consisting of a glycidyl acrylate, an acrylic acid, an acrylamide and an .alpha.-cyanoacrylate.

Abstract: A process for preparing a .beta.-(fluoroalkyl or fluoroalkenyl)-.beta.-hydroxyalkyne represented by the formula ##STR1## wherein R.sub.f represents a fluoroalkyl or fluoroalkenyl group and R represents an aliphatic or aromatic group, comprising reacting an alkyne represented by the formulaR--C.tbd.CH (II)wherein R is the same as defined above with a fluorine containing aldehyde represented by the formulaR.sub.f CHO (III)wherein R.sub.f is the same as defined above in the presence of catalyst under ultrasonic irradiation.A process for preparing an .alpha.-(fluoroalkyl or fluoroalkenyl)allyl alcohol represented by the formula ##STR2## wherein R.sub.f represents a fluoroalkyl or fluoroalkenyl group, R represents an aliphatic or aromatic group and R' represents a hydrogen atom or an aliphatic group, comprising (1) reacting a .beta.-(fluoroalkyl or fluoroalkenyl)-.beta.-hydroxyalkyne represented by the formula ##STR3## wherein R.sub.

Abstract: Working fluids for the Rankine cycle comprising dichlorotetrafluoroethane and a member selected from the group consisting of difluoroethane and dichlorofluoromethane.

Abstract: A fluorine-containing polymer substantially comprising (A) at least one fluorine-containing olefin of the formula:CF.sub.2 =CXYwherein X is a hydrogen atom or a fluorine atom and Y is a hydrogen atom, a chlorine atom, a fluorine atom, a trifluoromethyl group, a difluoromethyl group, a C.sub.1 -C.sub.3 perfluoroalkoxy group or a group of the formula:--(CF.sub.2).sub.m COOMwherein m is an integer of 0 to 3 and M is a hydrogen atom, a C.sub.1 -C.sub.4 alkyl group, a sodium atom or a potassium atom but when X is a hydrogen atom, Y is always a hydrogen atom, (B) one or more C.sub.4 -C.sub.8 fluorine-containing dienes, (C) at least one iodine atom and (D) at least one saturated or unsaturated fluoro or chlorofluorohydrocarbon group, the molar ratio of the diene (B) and the olefin (A) being from 1.times.10.sup.-4 to 5.times.10.sup.-2, the iodine atom(s) (C) being from 0.001 to 10% by weight based on the weight of the polymer and the molar ratio of the group (D) and the olefin (A) being from 1.times.10.sup.-5 to 5.

Abstract: A fluorine-containing copolymer comprising chlorotrifluoroethylene, 2,2,3,3-tetrafluoropropyl vinyl ether and 0 to 25% by mole of a vinyl ether having a functional group selected from the group consisting of hydroxyl glycidyl and amino. The fluorine-containing copolymer has a good compatibility with methyl methacrylate polymers and gives, in combination with methyl methacrylate polymers, products such as coating film, self-supporting film and molded article, which have good stain resistance and transparency.

Abstract: A fluorine-containing 3-oxygenated-.DELTA..sup.3,5 -steroid is prepared in a good yield by fluorinating a steroid with a compound of the formula:RCOOFwherein R is a hydrocarbon group.

Abstract: A fluid flow control system has a capability of operating selectively in a power matching mode, in which power consumption is low, and a maximum flow mode in which high responsivity and high speed features can be appreciated. For this purpose, a mode selector valve is used to switch the system between these two modes.

Abstract: A process for direct fluorination of etherified or unetherified hydroxy group-bearing aromatic compounds, which comprises reacting an etherified or unetherified hydroxy group-bearing aromatic compound with fluorine gas to give the corresponding etherified or unetherified hydroxy group and at least one fluorine atom-bearing aromatic compound.

Abstract: An aqueous coating composition comprising a fluororesin, and (a) molybdic acid or its salt, (b) phosphoric acid or its salt, (c) ammonium hydroxide and (d) colloidal silica, the weight ratio of the fluororesin to the total amount of the ingredients (a), (b), (c) and (d) being 90:10 to 20:80 and the molar ratio of (a) molybdic acid or its salt as converted to MoO.sub.3, (b) phosphoric acid or its salt as converted to orthophosphoric acid, (c) ammonium hydroxide and (d) colloidal silica being 1:1:1:1 to 1:20:15:20 has good adhesivity, good corrosion resistance and heat resistance without exerting any toxicity and causing any pollution problem.

Abstract: A copolymer comprising monomeric units of tetrafluoroethylene, ethylene and at least one monomeric compound selected from the group consisting of 2-trifluoromethylpropylene and 2-methyl-1,1,3,3,3-pentafluoropropylene, which has a improved crack resistance at a high temperature.

Abstract: A cleaning composition containing 1,1,2,2-tetrachloro-1,2-difluoroethane, 1,1,2-trichloro-1,2,2-trifluoroethane and at least one other organic solvent having a melting point of not more than 15.degree. C. and a boiling point of 40.degree. to 150.degree. C. and capable of forming an azeotrope with at least one of said 1,1,2,2-tetrachloro-1,2-difluoroethane and 1,1,2-trichloro-1,2,2-trifluoroethane.

Abstract: A copolymer comprising monomeric units derived from ethylene, tetrafluoroethylene or chlorotrifluoroethylene and a fluorovinyl compound of the formula:CH.sub.2 .dbd.CFRf (I)wherein Rf is a C.sub.2 -C.sub.10 fluoroalkyl group, a molar ratio of ethylene and tetrafluoroethylene or chlorotrifluoroethylene being from 40:60 to 60:40 and the content of the fluorovinyl compound being from 0.1% to 10% by mole having improved thermal resistance and high temperature mechanical properties such as crack resistance.

Abstract: A fluorine-containing aminocarboxylic acid compound of the formula: ##STR1## wherein Rf is a C.sub.3 -C.sub.21 fluorine-containing aliphatic group; R.sub.1 is a hydrogen atom or a C.sub.1 -C.sub.3 acyl group; R.sub.2 is a hydrogen atom or a C.sub.1 -C.sub.5 alkyl group; R.sub.3 is a substituted or unsubstituted C.sub.1 -C.sub.3 alkylene group; M is a cation; and n is an integer of 1 to 5 effectively lowers the surface tension of water and/or organic liquids and the interfacial tensions between them.

Abstract: An acrylic type self-adhesive which comprises a polymer comprising (a) units of at least one compound of the formula: ##STR1## wherein R.sup.1 is a hydrogen atom or a methyl, ethyl or propyl group, 1 is an integer of 1 to 5, s is 0 or 1, and Rf is --(CF.sub.2).sub.m X or --(CF.sub.2).sub.p O(CF.sub.2).sub.n F (wherein m is an integer of 1 to 10, X is a hydrogen or fluorine atom or a hexafluoroisopropyl group, n is an integer of 1 to 5 and p is an integer of 1 to 3), and optionally units of (b) at least one compound of the formula: ##STR2## wherein R.sup.2 is a hydrogen atom or a methyl, ethyl or propyl group and R.sup.3 is --OH, --NH.sub.2, --NHCH.sub.2 OH, ##STR3## --OCH.sub.2 CH.sub.2 OH, ##STR4## or --OCH.sub.2 CH.sub.2 N(CH.sub.3).sub.2, said polymer having an intrinsic viscosity of 0.1 to 1.0, which shows excellent oil resistance and water resistance.

Abstract: 1,1,2-Trifluoro-2-chloroethyl difluoromethyl ether is prepared in a good yield by reacting 1,1,2-trifluoro-2-chloroethyl dichloromethyl ether with hydrogen fluoride at a gaseous phase.

Abstract: A dental casting coated with a tetrafluoroethylene polymer shows suppressed accumulation and easy removability of the plaque, and excellent mechanical endurance.

Abstract: An aqueous fluorine-containing rubber coating composition comprising (a) fluorine-containing rubber, (b) fluorine-containing resin, (c) an aminosilane compound of the formula: ##STR1## wherein R is methyl or ethyl; X is a single bond or --(CH.sub.2).sub.2 --NH--, --CONH-- or --(CH.sub.2).sub.2 --NH--(CH.sub.2).sub.2 --NH--; and n is 2 or 3, and (d) an aqueous liquid vehicle, the weight ratio of the component (a) and the component (b) being from 95:5 to 35:65, which makes the resultant coating film non-adherent and more lubricous.

Abstract: An easily cross linkable fluorine-containing polymer comprising: (1) a polymeric chain comprising one or more polymer segments, at least one polymer segment of which consists of units of at least one fluorine-containing ethylenically unsaturated compound having 2 to 8 carbon atoms, or units of said fluorine-containing ethylenically unsaturated compound and at least one other monomer selected from the group consisting a fluorine-free ethylenically unsaturated compound having 2 to 4 carbon atoms and a fluorine-containing diene having 4 to 8 carbon atoms, (2) at least one bromine atom liberated from a brominated compound of the formula: RBr.sub.x (wherein R is a saturated hydrocarbon residue and x is a number corresponding to the bonding valency of the residue R) in an amount of 0.