Abstract: A vacuum envelope for display which reduces a stress and a deflection in a screen area of a panel face portion and has a light weight and which is suitable for a cathode ray tube or a field emission display, wherein the screen area is composed of a complex layer member comprising a glass layer as an inner layer and a transparent resin as an outer layer, and the proportion of the Young's modulus of the transparent resin to the Young's modulus of the glass layer is {fraction (1/10)}-⅕.

Abstract: A process for producing 1,1-dichloro-1,2,2,2-tetrafluoroethane, which comprises isomerizing 1,1,2-trichloro-1,2,2-trifluoroethane to form 1,1,1-trichloro-2,2,2-trifluoroethane, followed by fluorination with hydrofluoric acid.

Abstract: A hydrochlorofluorocarbon azeotropic or azeotropic-like mixture comprising at least one member selected from the group consisting of hydrogen-containing fluoropropanes of the formula I:CH.sub.a Cl.sub.b F.sub.c CF.sub.2 CH.sub.x Cl.sub.y F.sub.z (I)wherein a+b+c=3, x+y+z=3, a+x.gtoreq.1, b+y.gtoreq.1, and 0.ltoreq.a,b,c,x,y,z.ltoreq.3, and at least one member selected from the group of compounds II consisting of halogenated hydrocarbons having a boiling point of from 20.degree. to 85.degree. C. other than said hydrochlorofluoropropanes, hydrocarbons having a boiling point of from 20.degree. to 85.degree. C. and alcohols having from 1 to 4 carbon atoms.

Abstract: A process for producing a hydrogen-containing 2,2-difluoropropane of the following formula (2), which comprises subjecting a 2,2-difluoropropane of the following formula (1) to hydrogen reduction:C.sub.3 H.sub.a Cl.sub.b F.sub.c (1)C.sub.3 H.sub.a+x Cl.sub.b-y F.sub.c-z (2)wherein a, b, c, x, y and z are integers satisfying the following conditions:a.gtoreq.0, b.gtoreq.1, c.gtoreq.2, x.gtoreq.1, y.gtoreq.0, z.gtoreq.0, a+b+c=8, x=y+z b-y.gtoreq.0, and c-z.gtoreq.2.

Abstract: A process for producing 1,1,1,2-tetrafluoroethane, which comprises reacting 2,2-dichloro-1,1,1,2-tetrafluoroethane, 2-chloro-1,1,1,2-tetrafluoroethane or a mixture thereof with hydrogen in the presence of a hydrogenation catalyst consisting essentially of a Group VIII element as the main component and at least one element selected from the group consisting of Group IB elements, lanthanum and lanthanide elements, as an additional component.

Abstract: A hydrochlorofluoropropane azeotropic or azeotropic-like composition comprising at least two members selected from the group consisting of hydrochlorofluoropropanes of the formula I:CH.sub.a Cl.sub.b F.sub.c CF.sub.2 CH.sub.x Cl.sub.y F.sub.z (I)wherein a+b+c=3, x+y+z=3, a+x.gtoreq.1, b+y.gtoreq.1, and 0.ltoreq.a,b,c,x,y,z.ltoreq.3.

Abstract: A solvent consisting essentially of a compound of the formula:CH.sub.a Cl.sub.b F.sub.c CF.sub.2 CH.sub.x Cl.sub.y F.sub.z(I)wherein a+b+c=3, x+y+z=3, a+x.gtoreq.1, b+y.gtoreq.1, and 0.ltoreq.a, b, c, x, y, z.ltoreq.

Abstract: A solvent consisting essentially of a compound of the formula:CH.sub.a Cl.sub.b F.sub.c CF.sub.2 CH.sub.x Cl.sub.y F.sub.z(I)wherein a+b+c=3, x+y+z=3, a+x.gtoreq.1, b+y.gtoreq.1, and 0.ltoreq.a, b, c, x, y, z.ltoreq.3.

Abstract: A process for producing a 2,2-difluoropropane of the following formula (2), which comprises fluorinating a chlorine-containing 2,2-halogenopropane of the following formula (1) by hydrogen fluoride or a fluorinating agent:C.sub.3 H.sub.a Cl.sub.b F.sub.c (1)C.sub.3 H.sub.a Cl.sub.b-x F.sub.c+x (2)wherein a, b, c and x are integers satisfying the following conditions:a.gtoreq.0, b.gtoreq.1, c.gtoreq.0, x.gtoreq.1, a+b+c=8.

Abstract: A method for cleaning a surface of a substrate which comprises treating the surface with a dichloro-pentafluoro-propane solvent. The method is specifically directed to the use of 1,1-dichloro-2,2,3,3,3-pentafluoro propane and 1,3-dichloro-1,1,2,2,3-pentafluoropropane as the cleaning solvent.

Abstract: A method for cyclic polymerization, wherein a fluorine-containing monomer is subjected to cyclic polymerization, the fluorine-containing monomer having two carbon-carbon multiple bonds, each having different polymerizability, as linked by a linking chain having a straight chain portion to from 2 to 7 atoms, and having a fluorine content of at least 10% by weight.

Abstract: A fluorine-containing thermoplastic resinous polymer which consist essentially of a group (a) of repeating units of a cyclic structure to be represented by the following general formula: ##STR1## (where: n is an integer of 1 to 2); the polymer having a molecular weight such that the intrinsic viscosity thereof may become at least 0.1.A fluorine-containing thermoplastic resinous polymer which consists essentially of:(i) a group (a) of repeating units to be represented by the following general formula: ##STR2## (where: n is an integer of 1 or 2), and (ii) a group (b) of repeating units to be represented by the following general formula:--CF.sub.2 --CFX)--(where: X is selected from fluorine, chlorine. O--CF.sub.2 CF.sub.2 CF.sub.3, O--CF.sub.2 CF(CF.sub.3)OCF.sub.2 CF.sub.2 SO.sub.2 F, and O--CF.sub.2 CF.sub.2 CF.sub.2 COOCH.sub.

Abstract: A process for producing a perfluoroacrylic acid ester represented by the general formula CF.sub.2 .dbd.CFCOOR where R is a monovalent organic substituent, which comprises pyrolyzing a monoester of perfluorosuccinyl fluoride represented by the general formula FOCCF.sub.2 CF.sub.2 COOR where R is as defined above, in a vapor phase.

Abstract: A difluorohaloacetyl fluoride is produced by (a) producing an intermediate having a group of the formulaXCF.sub.2 CFYOSO.sub.2.sup.-wherein X is I or Br, Y is F, Cl, Br or I; by reacting a polyfluoroethylene of the formulaCF.sub.2 .dbd.CFYwith a reagent obtained by mixing sulfur trioxide with a halogen selected from iodine and bromine; and (b) decomposing said intermediate into said product.

Abstract: A fluorinated vinyl ether having an ester group which has the formulaCF.sub.2 .dbd. CFOCF.sub.2 (CF(CF.sub.3)OCF.sub.2).sub.n-1 (Rf).sub.m CO.sub.2 Rwherein n represents an integer of 1 to 5; m represents 0 or 1; Rf represents a C.sub.1 -C.sub.10 bifunctional perfluoro group and R represents an alkyl group, is produced by reacting fluorinated acyl fluoride having an ester group which has the formulaFOC(CF(CF.sub.3)OCF.sub.2).sub.n (Rf).sub.m CO.sub.2 Rwith an alkali metal carbonate to produce an alkali metal salt of fluorinated carboxylic acid having an ester group which has the formulaMOOC(CF(CF.sub.3)OCF.sub.2).sub.n (Rf).sub.m CO.sub.2 Rwherein M represnts an alkali metal;And then, thermally decomposing the alkali metal salt of fluorinated carboxylic acid having an ester group.

Abstract: An oxygen-containing cyclicfluoro compound selected from the group consisting of a perfluorolactone having the formula ##STR1## a perfluorocyclic ether having the formula ##STR2## and mixtures thereof is produced by reacting an .alpha.,.omega.-diiodoperfluoroalkane having the formulaI (CF.sub.2).sub.n Iwith fuming sulfuric acid, wherein n is all formulas ranges from 3 to 5.

Abstract: A perfluorolactone having the formula ##STR1## wherein n is an integer of 2 to 4, is produced by reacting a fluoro compound having the formulaI(CF.sub.2).sub.n COXwherein n is an integer of 2 to 4 and X represents a halogen atom, --OR or --NR.sup.1 R.sup.2, and R, R.sup.1 and R.sup.2 respectively represent hydrogen atom or a C.sub.1 - C.sub.10 alkyl group, with fuming sulfuric acid.