Abstract: The present invention provides a method for inexpensively, efficiently, safely, and continuously producing COF2, without using highly toxic raw materials such as phosgene or difficult-to-get raw materials, with no risk of explosion or the like. Tetrafluoroethylene gas and oxygen gas are introduced into a reactor, and they are then heated in a gas phase in the absence of nitrogen gas for reaction, so as to produce carbonyl fluoride. The reactor is preferably a tubular reaction tube. As such tetrafluoroethylene gas, unpurified or purified tetrafluoroethylene gas obtained by heating HCFC-22 gas for thermal decomposition can be used. According to the present invention, COF2 that is useful as cleaning gas for CVD devices (chemical vapor deposition method) can be inexpensively, efficiently, and safely produced.

Abstract: A method for the preparation of a novel fluorinated compound, particularly 1,1,1,3,3-pentafluoropropane (HFC-245fa), by using a fluorination catalyst obtained by treating a metal salt containing a chromium salt such as chromium oxide with chlorine gas and/or oxygen gas. Examples of the metal salt may include, besides a chromium salt, one or more catalytically active metal salts selected from magnesium salts, aluminum salts, zinc salts, sodium salts, nickel salts, iron salts, cobalt salts, vanadium salts, manganese salts and copper salts.

Abstract: A porous aluminum fluoride on which SbClxF5-x (wherein x represents a numeral of 0 to 5) is supported, SbClxF5-x being obtainable by supporting SbCl5, or the like on a porous aluminum fluoride and treating it with hydrogen fluoride. The resulting porous aluminum fluoride has a high activity as a fluorinating agent, a fluorination catalyst, or the like, is easy to handle, can be used for a flow-type reaction, and also can be used even at a high temperature.

Abstract: The present invention provides a novel fluorination catalyst that has high stability at high temperatures, is easily regenerated and is superior in catalytic activity and selectivity and a method for the preparation of the fluorination catalyst. The present invention also provides a method for the preparation of a novel fluorinated compound, and particularly, 1,1,1,3,3-pentafluoropropane (HFC-245fa), by using the catalyst. The fluorination catalyst of the present invention is obtained by treating a metal salt containing a chromium salt such as chromium oxide with chlorine gas and/or oxygen gas. Examples of the metal salt may include, besides a chromium salt, one or more catalytically active metal salts selected from magnesium salts, aluminum salts, zinc salts, sodium salts, nickel salts, iron salts, cobalt salts, vanadium salts, manganese salts and copper salts.

Abstract: Porous calcium fluoride having a large surface area, a method for producing the same, a catalyst (for hydrogenation reaction in particular) using the porous calcium fluoride as a carrier with superior activity, selectivity, and durability, and a method for producing trihydrofluorocarbon using the catalyst. The porous calcium fluoride having a BET surface area of 20 m2/g to 200 m2/g is prepared by reacting soda lime with hydrogen fluoride. The carried cataryst (for hydrogenation reaction in particurar) is obtained by causing a metal or metal compound to be carried on carrier formed of the porous calcium fluoride. Trihydrofluorocarbon (2) is produced by causing a fluooroalkene (1) to contact hydrogen in the presence of the catalyst for hydrogenation reaction. wherein X denotes a halogen atom, Rf1 and Rf2 individually denote a fluorine or a parafluoroalkyl group, and Rf1 may be bonded to Rf2 to form a ring.

Abstract: A collective communication apparatus in a multiprocessor system which shortens communication processing time by reducing data transfer that utilizes communication paths of low performance includes a processor group defining unit for defining groups of processors, from a plurality of processors connected by communication paths of various performance levels, that are capable of implementing data transfer on a communication path or paths of equal performance levels, and creating lists of these processor groups; a master-processor registration updating unit for updating the lists by a root processor designation included in a communication request; a collective communication execution control unit for controlling, depending upon the type of collective communication, the order in which the lists are executed; and a list-referring collective communication execution unit for performing collective communication with specific processors using the lists.

Abstract: A multiprocessor system has a transmitting processor and a receiving processor. In response to a transmission request, the transmitting processor implements means for selecting one of two communication buffers of a shared memory in accordance with a given rule; write inhibit means for changing the selected communication buffer to a write-disabled state in order to inhibit writing of the selected communication buffer by other processors; data writing means for copying data from a local memory to the selected communication buffer; write-completion notifying means for notifying a receiving processor of completion of writing; and transmission-end discriminating means for discriminating end of transmission processing.

Abstract: A novel fluorine-containing polymeric compound represented by the general formula--CH.sub.2 --CH[(CH.sub.2).sub.a --NH.sub.2 ]--CH.sub.2 --CH[(CH.sub.2).sub.a --NH--CO--NH--CH.sub.2).sub.a Rf]).sub.n,in which Rf is a perfluoroalkyl group having 6 to 15 carbon atoms, m is a positive integer in the range from 10 to 1500, n is a positive integer smaller than 0.7 m and a is 0 or 1, is prepared by the reaction of, when a is 0, a polyvinylamine of the formula --CH.sub.2 --CHNH.sub.2 ].sub.m, with an alkyl perfluoroalkanoate of the formula Rf--CO--OR, in which R is an alkyl group having 1 to 5 carbon atoms, or, when a is 1, a polyallylamine of the formula [CH.sub.2 --CH(CH.sub.2 --NH.sub.2)].sub.m, with a perfluoroalkylmethyl isocyanate of the formula RfCH.sub.2 --NCO. Despite the high fluorine content, the polymer is soluble in at least one kind of organic solvents so that Langmuir-Blodgett's films can be prepared from a solution of the polymer.

Abstract: A novel fluorine-containing polymeric compound represented by the general formula--CH.sub.2 --CH[(CH.sub.2).sub.a --NH.sub.2 ]}.sub.m-n--CH.sub.2 --CH[(CH.sub.2).sub.a --NH--CO--NH--CH.sub.2).sub.a Rf]}.sub.n,in which Rf is a perfluoroalkyl group having 6 to 15 carbon atoms, m is a positive integer in the range from 10 to 1500, n is a positive integer smaller than 0.7 m and a is 0 or 1, is prepared by the reaction of, when a is 0, a polyvinylamine of the formula --CH.sub.2 --CHNH.sub.2 ].sub.m, with an alkyl perfluoroalkanoate of the formula Rf--CO--OR, in which R is an alkyl group having 1 to 5 carbon atoms, or, when a is 1, a polyallylamine of the formula --CH.sub.2 --CH(CH.sub.2 --NH.sub.2)].sub.m, with a perfluoroalkylmethyl isocyanate of the formula RfCH.sub.2 --NCO. Despite the high fluorine content, the polymer is soluble in at least one kind of organic solvents so that Langmuir-Blodgett's films can be prepared from a solution of the polymer.

Abstract: A novel fluorine-containing polymeric compound represented by the general formula--CH.sub.2 --CH(CH.sub.2 --NH.sub.2)].sub.m-n --CH.sub.2 --CH(CH.sub.2 --NH--CS--NH--Pn--OCH.sub.2 Rf)].sub.n,in which Rf is a perfluoroalkyl group having 6 to 15 carbon atoms, Pn is a 1,2- or 1,4-phenylene group, m is a positive integer in the range from 10 to 1500, n is a positive integer not exceeding m, is prepared by the reaction of one mole of a polyallylamine of the formula--CH.sub.2 --CH(CH.sub.2 --NH.sub.2)].sub.m,in which m has the same meaning as defined above, with n moles of a 2- or 4-(perfluoroalkylmethoxy)phenyl isothiocyanate represented by the general formulaRfCH.sub.2 O--Pn--NCS,in which Rf and Pn each have the same meaning as defined above. Despite the high fluorine content, the polymer is soluble in at least one kind of organic solvents so that Langmuir-Blodgett's films can be prepared from a solution of the polymer.

Abstract: An ethylene polymer is produced with an excellent yield by bringing a feed containing ethylene into contact with a catalyst which comprises (A) a solid catalytic ingredient prepared (a) by reacting a Grignard compound with a reaction product of an aluminum halide with an organic silicon compound of the formula, R.sup.1.sub.n Si(OR.sup.2).sub.4-n, wherein R.sup.1 =C.sub.1-8 alkyl or phenyl, R.sup.2 =C.sub.1-8 alkyl and n=1, 2 or 3 and (b) by bringing the resultant solid reaction product into contact with titanium tetrahalide and (B) another catalytic ingredient consisting of at least one trialkyl aluminum.

Abstract: An .alpha.-olefin polymer having an excellent H.I. is produced with a high yield by bringing, in the presence of an organic acid ester, a feed containing at least one .alpha.-olefin, having 3 or more carbon atoms, into contact with a catalyst composed of:a solid catalytic ingredient which has been prepared in such a manner that an aluminosiloxy compound of the formula, ##STR1## wherein X.sup.1 represents a chlorine atom, a bromine atom or an iodine atom, is reacted with a Grignard compound of the formula R.sup.1 MgX.sup.2 [II] wherein R.sup.1 represents an alkyl radical having 1 to 8 carbon atoms and X.sup.2 represents a halogen atom, the resultant solid reaction product is brought into contact with a titanium tetrahalide, the resultant titanium-containing solid product is treated with an organic acid ester, and the treated solid product is brought into contact with a titanium tetrahalide; anda trialkyl aluminum.

Abstract: An ethylene polymer is produced with an excellent yield by bringing a feed containing ethylene into contact with a catalyst which comprises (A) a solid catalytic ingredient prepared (a) by reacting a Grignard compound with an aluminium halide-tetraalkoxysilane reaction product and (b) bringing the resultant reaction product into contact with titanium tetrahalide and; (B) another catalytic ingredient consisting of a trialkyl aluminium.