Abstract: Compounds suitable for being used as lubricants, having general formula:RO--(C.sub.3 F.sub.6 O).sub.m --(CFXO).sub.n --CFX--L, (I)orR"CFXO--(C.sub.3 F.sub.6 O).sub.x (CFXO).sub.y --(C.sub.2 F.sub.4 O).sub.z--CFX--L, (II)whereR=--CF.sub.3, --C.sub.2 F.sub.5, --C.sub.3 F.sub.7X=F, --CF.sub.3R"=F, --CF.sub.3, --C.sub.2 F.sub.5m=an integer from 3 to 100n=a finite integer, or=zero, wherefore m+n ranges from 3 to 100, provided that, if n is finite, m/n ranges from 5 to 20 and R is preferably=CF.sub.3, if n=zero, R is preferably --C.sub.2 F.sub.5 or --C.sub.3 F.sub.7x=a finite integer, or=zeroy, z=finite integers, such that x+y+z ranges from 5 to 200, while (x+z)/y ranges from 5 to 0.5, provided that when x=zero, z/y ranges from 1 to 0.05 and y+z ranges from 5 to 200 n while X is preferably F, and R"=LL=group A--Y, whereA=--CH.sub.2 O--, --CH.sub.2 --O--CH.sub.2, --CF.sub.2, --CF.sub.2 O,Y=an organic radical covered by one of the following formulas: ##STR1## R.sub.1, R.sub.2 =alkyls C.sub.1 -C.sub.3, E=CHR.sub.

Abstract: Polymers of alpha-olefins of formulaR--CH.dbd.CH.sub.2wherein R=alkyl of from 1 to 6 C atoms, or of their mixtures with minor amounts of ethylene are obtained by adopting catalysts comprising:(A) a solid component obtained by treating an emulsion (a) in a perfluoropolyether liquid of a liquid compound of magnesium, of titanium or of another transition metal, either liquid or in solution, with possibly using an electron-donor compound, with (b) a reducing and/or halogenating agent capable of forming an insoluble solid product, after which, if such a product is a precursor of the catalytic components, it is treated with a tetravalent-titanium halide, or with a halide of another transition metal;(B) an aluminum-alkyl compound;(C) an outer electron-donor compound (c).

Abstract: A process for preparing titanium dioxide in the form of spherical particles having the particle size distribution indicated by dw/dn.ltoreq.2, by hydrolysis of strongly acid solutions of Ti(IV), wherein the molar ratio SO.sub.4.sup.= /Ti(IV) is at least 1.5, and in the presence of cationic polyelectrolytes having a molecular weight higher than 1 million and a ionicity of at least 3 milliequivalents per gram.

Abstract: A cutting device for the hot granulation of thermoplastic polymers including a rotary driving shaft, a blade-carrying disc rigidly keyed on the driving shaft and blades not rigidly mounted on said disc and sliding on the cutting plate, each blade being paired to an opposing element which opposes any sudden action tending to move the blade away from the plate.This invention relates to a cutting device for the hot granulation of thermoplastic polymers.More in particular, the present invention relates to a cutting device for the hot granulation of thermoplastic polymers, in which cutting of polymer monofilaments leaving the die plate is accomplished directly on the face of said die plate.

Abstract: Process for the preparation of (2,2)-paracyclophane or derivatives thereof by the Hofmann elimination of p-methylbenzyltrimethylammonium hydroxide or derivatives thereof, in an aqueous solution of an alkali metal hydroxide, wherein said elimination is carried out in the presence of a dialkylether of mono- and poly-ethylene glycols having the formula:R--O--CH.sub.2 CH.sub.2 O--.sub.n R' (I)wherein R and R', which may be the same or different, represent alkyl groups having from 1 to 5 carbon atoms, and n is an integer from 1 to 5.

Abstract: This invention relates to novel compounds having antidotal activity so as to be useful in the protection of cultivations of agrarian interest from the toxic action of non-selective weed-killers. The novel compounds of this invention have the formula: ##STR1## wherein R=alkyl, phenyl; R.sup.1 =OR.sup.4 =alkyl, cycloalkyl, cyclohexylmethyl, allyl, propargyl, phenyl or benzyl, optionally substituted; R.sup.2 =H or R.sup.1 and R.sup.2 together form a bond between carbonyl and the nitrogen atom which they are linked to; X=O, S; R.sup.3 is the same are R.sup.4, but is different from 3,5-dichlorophenyl.

Abstract: A process for the dissociation of high molecular weight perfluoropolyethers to obtain low molecular weight perfluoropolyethers which comprises treating a perfluoropolyether with 0.1-10% by weight of a catalyst consisting of Ti, Cr, Mn, Fe, Co, Ni, V, Cu, Mo, Sn, Sb, Zr, Zn oxides at temperatures comprised between 150.degree. and 380.degree. C.

Abstract: Process for the adhesion of para-xylylene vapors to solid substrates by the use of an unsaturated ester of phosphoric acid of the formula: ##STR1## wherein at least one of the radicals R.sub.1, R.sub.2 and R.sub.3 is hydrogen and at least one of said radicals is:M--O--D--with M being a methacrylyl or acrylyl radical and D a straight or branched alkylene radical containing 2 to 6 carbon atoms, optionally halogen-substituted.

Abstract: There is disclosed a process for the preparation of halogenated (2,2)-paracyclophanes by Hofmann elimination, in an alkaline medium, from p.methylbenzyltrimethylammonium hydroxide halogen-substituted in the nucleus.

Abstract: Undoped GaAs single crystals with low dislocation density, low impurity content, 0.20-1 Kg in weight and constant diameter of 1"-2" (inches), said single crystals being obtained with LEC technology at low or high pressure with synthesis of the polycrystal in situ and subsequent growth of the single crystal.

Abstract: Polyacetylene having an apparent density at 20.degree. C. greater than 0.6 g/ccm and a surface area below 60 m.sup.2 /g is prepared by polymerizing gaseous acetylene in the presence of a catalytic system consisting of:(a) an oxygenized compound of Ti or V, containing at least one metal-oxygen bond;(b) an organometallic compound of aluminum containing at least one hetero-atom, of the formula: ##STR1## wherein: ##STR2## while R=a hydrocarbon radical with 1-18 carbon atoms, and where R'.dbd.R, or halogen or alcoxyl.

Abstract: New fungicides which are N-aryl-N-acyl-3-amino-oxazolidin-2-ones and use thereof in fighting infections of useful plants by fungi are disclosed. The compounds of the invention have a high fungicidal activity combined with a good compatibility with the plants to be defended against attack by fungi.

Abstract: There are disclosed compounds having the formula (I) and (II): ##STR1## wherein: R' and R", equal to or different from each other, are a C.sub.1 -C.sub.7 alkyl, a C.sub.3 -C.sub.7 cycloalkyl, a heterocycloalkyl, alkoxyalkyl, dialkoxyalkyl, haloalkyl;X is a halogen, a C.sub.1 -C.sub.4 alkyl, a haloalkyl, alkoxyl, phenyl; andY is H or a halogen.

Abstract: Block copolymers of ethylene and/or alpha-olefins, in particular propylene, with vinyl aromatic monomers, comprising at least two polymeric blocks, one of which being a polyolefinic block and the other having a stereoregular structure and being formed by vinyl aromatic monomer units.

Abstract: There is described the preparation of S(+) alpha-aryl-alkanoic acids by means of the reaction of a racemic ester(R,S) of the formula: ##STR1## wherein: R is a group selected from the group consisting of --C.tbd.CH, a --CH.dbd.CH.sub.2, --CN; --COCH.sub.3, --COO alkyl C.sub.1 C.sub.4 and --CH.sub.2 --O alkyl C.sub.1 -C4 group, Ar is a group selected from the group consisting of an aryl group and an aryl substituted or condensed with other groups, in particular a group selected from the group consisting of groups of the formula: ##STR2## wherein: R' is selected from the group consisting of C.sub.1 -C.sub.8 linear or branch of chain alkyl, C.sub.1 -C.sub.4 alkenyl, alkoxy, phenyl, phenoxy, tenoyl and heterocyclic;R" is selected from the group consisting of hydrogen or halogen;R"' is a C.sub.1 -C.sub.4 alkyl,with an esterase, produced by microorganisms capable of selectively hydrolizing the S(+) form of said racemic ester and by successively separating the S(+) acid from the unreacted ester.

Abstract: A method for passivating the surface of the strippers of the urea plants, where the temperatures are very high, where the pressures range from 120 to 240 Kg/cm.sup.2 and where the effluent process flow from the synthesis reactor undergoes one or more falling-film evaporations, preferably in countercurrent with a driving gas consisting of NH.sub.3 or CO.sub.2, characterized by the fact that the passivation is carried out by means of a sinergistic combination of oxygen, preferably injected into the bottom of at least one stripper, and of a second passivating agent, preferably injected into the process flow entering the head of at least one stripper, wherein said second passivating agent is injected in the liquid state or as a liquid solution, before or contemporaneously to the start of the evaporation.

Abstract: Compounds suitable for being used as lubricants, having general formula:(I) RO--(C.sub.3 F.sub.6 O).sub.m --(CFXO).sub.n --CFX--L,or(II) R"CFXO--(C.sub.3 F.sub.6 O).sub.x (CFXO).sub.y --(C.sub.2 F.sub.4 O).sub.z --CFX--L,whereR=--CF.sub.3, --C.sub.2 F.sub.5, --C.sub.3 F.sub.7X=F, --CF.sub.3R"=F, --CF.sub.3, --C.sub.2 F.sub.5m=an integer from 3 to 100n=a finite integer, or=zero, wherefore m+n ranges from 3 to 100, provided that, if n is finite, m/n ranges from 5 to 20 and R is preferably=CF.sub.3, if n=zero, R is preferably --C.sub.2 F.sub.5 or --C.sub.3 F.sub.7x=a finite integer, or=zeroy, z=finite integers, such that x+y+z ranges from 5 to 200, while (x+z)/y ranges from 5 to 0.5, provided that when x=zero, z/y ranges from 1 to 0.5 and y+z ranges from 5 to 200 n while X is is preferably F, and R"=LL=group Y-Z,where:Y=--CH.sub.2 O--, --CH.sub.2 --OCH.sub.2, --CF.sub.2, --CF.sub.

Abstract: Titanates of barium, strontium, or mixed barium and strontium consisting essentially of solid, non-aggregated particles having diameters ranging from 0.05 to 1 micron and a narrow particle size distribution expressed by the polydispersity index, dw/dn, not greater than 1.20, where dw is the weight average diameter and dn is the number average diameter, said particles being essentially perfectly spherical with a total mean axial ratio of at least 0.93. These titanates are prepared by a process which comprises precipitating of a peroxidic precursor having the same morphological characteristics of the titanates. The peroxidic precursor is obtained by heating an alkaline solution comprising a complex of a titanium compound with a peroxidic compound, an M.sup.2+ compound, wherein M is Ba, Sr or mixtures thereof, and a compound Z capable of complexing with the M.sup.

Abstract: Polymeric blends containing 20-80% by weight of a modified vinyl-aromatic polymer containing from 5 to 15% by weight of an ethylenically unsaturated nitrile, and 80-20% by weight of at least one resin containing aromatic groups selected from aromatic polycarbonates and crystalline aromatic polyesters.

Abstract: A falling-film process and apparatus for the cocurrent evaporation of a solution is disclosed. The process utilizes a tube-bundle heat exchanger in which the upper ends of the individual tubes of the tube-bundle are closed. Apertures, preferably in the form of slots, are formed adjacent the closed-end of the individual tubes. A liquid heel is maintained above the highest of said apertures and flows into the interior of the tubes through said apertures. Upon entering the tubes the liquid and any vapor released therefrom flows cocurrently in a downward direction. The vapors released from the liquid are recycled to a point above the liquid heel through conduit means separate from the individual tubes.