Abstract: A new process for preparing oxalyl- and oxamyl-hydrazides which comprises contacting oxamide or diacetyloxamide with the corresponding hydrazine derivative of formulaR.sub.1 R.sub.2 N--NHR.sub.3wherein R.sub.1 represents a hydrogen atom or an optionally substituted alkyl, cycloalkyl, aryl, or aryl-alkyl group, R.sub.2 is a hydrogen atom or an optionally substituted alkyl group, or R.sub.1 and R.sub.2 taken together with the adjacent nitrogen atom represent a saturated heterocyclic ring, and R.sub.3 is a hydrogen atom or an optionally substituted alkyl group.

Abstract: Alpha-olefin polymers and copolymers are prepared by polymerizing the monomers in the presence of a catalyst obtained by bringing into contact:a) a compound definable by the formula: ##STR1## wherein: M is represents a metal of group 4.beta. of the periodic table of elements;each R independently represents halogen atom; a linear or branched C.sub.1 -C.sub.10 alkyl group; or an aryl group; andeach Cp independently represents the cyclopentadienyl, indenyl or fluorenyl, group, possible carrying one or more C.sub.1 -C.sub.4 alkyl substituents, which Cp groups can also be connected together by a carbon atom or alkylsilane bridge structure;b) a trialkylaluminium: ##STR2## wherein each R' independently represents a linear or branched C.sub.1 -C.sub.10 alkyl group, or an aryl group; andc) a distannoxane: ##STR3## where each R" independently reprepsent a linear or branched C.sub.1 -C.sub.

Abstract: The disposal of chlorinated pitches is carried out by a process which employs two treatments with an alcohol, which are carried out in cascade.Such treatments cause the precipitation of the suspended matter to take place. This is then caused to settle, and is separated and pyrolized, while the supernatant is distilled in order to separate the alcohol, which is recycled back to the process, from other organic components, which are sent to further uses.

Abstract: Ethylene homopolymers and ethylene copolymers with alpha-(C.sub.3 -C.sub.10)-olefins are obtained by polymerizing the monomers with a polymerization catalyst formed by:a) an alkyl-aluminum; andb) a modified solid catalyst component obtained by treating with a Lewis' base a non-modified solid component to be defined by means of the following formula, expressed as atomic proportions:Ti(1), hf(0.5-3), Si (1-6), Mg (0.5-15) Al (0.5-15),X (20-60, ROH (1-10)wherein:X represents either chlorine and bromine, andR represents either a linear or branched alkyl radical of from 1 to 6 carbon atoms.The catalyst is particularly useful for controlling the molecular weight and the molecular weight distribution of ethylene hompolymers and copolymers.

Abstract: A solid catalyst component for the low-pressure polymerization of ethylene and C.sub.3 -C.sub.10 alpha-olefins into very high molecular weight polyolefins is in the form of a spherical granular solid having a surface area of between 20 and 40 m.sup.2 /g, a mean pore radius of between 5,000 and 40,000 .ANG. and a porosity of between 40 and 90 vol %, and is definable by the following formula (in atomic proportions:X (1), Mg (1-8), Al (0.2-0.8), Cl (5-20), (Et+OEt+OR) (1-3);where: X=Hf or Zr; Et=ethyl group; OEt=ethoxy group; and OR=alkoxy group containing from 2 to 8 carbon atoms in the linear or branched alkyl portion.Such a catalyst component is obtained by preparing a solid spherical granular support by spray-drying an ethanolic solution of magnesium chloride, reacting said support with a hafnium or zirconium alkoxide or halogenalkoxide, and finally reacting the thus treated support with an alkyl aluminum chloride.

Abstract: A method of removing copper from oxamide obtained through a process which involves the use of copper catalysts, by contacting it with an aqueous solution of a suitable complexing agent, which is capable of forming copper-containing water-soluble complexes and imparts to the aqueous solution a pH comprised between 2 and 8, optionally repeating the contacting step and, finally, recovering the purified oxamide by solid-liquid separation techniques.The claimed process affords oxamide containing less than 25 ppm of copper.

Abstract: A process is disclosed for the purification of the diamide of oxalic acid obtained by means a process wherein copper catalysts are used, by means of the washing with aqueous solutions of an ammonium salt of an organic or inorganic acid, operating at a pH value comprised within the range of from 2 to 8, and at a temperature comprised within the range of from 40.degree. to 150.degree. C.

Abstract: The present invention relates to a new method of synthesis of 2,2'-bis.DELTA..sup.2 -oxazoline, which consists of three steps:in the first step,N,N'-bis-(2-hydroxyethyl)-oxamide (I) is reacted with hydrogen chloride and a nitrile of formula RCN in which R.dbd.H, alkyl, aryl, arylalkyl, alkylaryl, in order to yield the correspondingN,N'-bis-(2-iminoacyloxyethyl)oxamide.2HCl (II).In the second step, the compound (II) is pyrolyzed in order to yieldN,N'-bis-(2-chloroethyl)oxamide (III) which in the third step generates, by means of the treatment with a base, the desired product 2,2'-bis-.DELTA..sup.2 -oxazoline.

Abstract: A solid catalyst component for the polymerization of ethylene and the copolymerization of ethylene with C.sub.3 -C.sub.10 alpha-olefins, contains titanium, vanadium and chlorine, is substantially definable by the formula (in atomic proportions):V (1), Ti (n), Cl (4n)where n varies from 1 to 3, and is prepared by reacting titanium tetrachloride with a vanadium arene [V.degree.(arene).sub.2 ] (arene=benzene or mono-, di- or tri-alkyl substituted benzene) in accordance with the equation:V.degree.(arene).sub.2 +nTiCl.sub.4 .fwdarw.VTi.sub.n Cl.sub.4n +2 arenepossibly followed by treatment with an alkyl aluminum chloride. This catalyst component, when associated with a trialkyl aluminium, is highly active in the production of ethylene polymers and copolymers by low temperature, low pressure methods in suspension, or by high temperature, high pressure methods conducted in a tubular reactor or pressure vessel, or by high temperature methods conducted in solution.

Abstract: A homogeneous composition for road surfacing contains a bitumen for road use and a quantity of a mixture of thermoplastic organic polymers of up to 20 parts by weight per 100 parts by weight of the bitumen, said mixture containing not less than 40% and up to 70% by weight of one or more polyolefins, the remaining percentage consisting essentially of polyvinylchloride, polyethylene terephthalate and polystyrene.This mixture of thermoplastic polymers can be obtained by recovering and recycling the plastics material contained in solid urban refuse or in industrial waste.

Abstract: A new process is described for the preparation of oxalic acid esters and amides of general formula (I) ##STR1## wherein Z designates an --OR or --NR.sup.1 R.sup.2 group, wherein R represents substituted or unsubstituted alkyl, alkenyl, cycloalkyl, aryl, or aryl-alkyl, R.sup.1 is hydrogen or substituted or unsubstituted alkyl, alkenyl, cycloalkyl, aryl, or aryl-alkyl, R.sup.2 represents substituted or unsubstituted alkyl, alkenyl, cycloalkyl, aryl, or aryl-alkyl, or R.sup.1 and R.sup.2 taken together with the adjacent nitrogen atom represent a saturated 5-, 6-, 7-, or 8-membered heterocyclic ring, which may contain an additional heteroatom selected from --O--, --S--, and --N(H, Alkyl)--, and optionally bear one or more alkyl or alkenyl substituents, andZ.sup.1 designates an --OR or --NR.sup.1 R.sup.2 group, wherein R, R.sup.1, and R.sup.2 are as defined before, or a group --NHCOCH.sub.3, which comprises the base-catalysed reaction of diacetyloxamide with an alcohol ROH or/and an amine HNR.sup.1 R.sup.2.

Abstract: Vanadium-arenes [V(arene).sub.2 ] (arene=benzene or mono-, di-, or poly-alkyl-substituted benzene) are obtained, with a high yield, by means of the reduction of a vanadium-arene iodide with zinc, manganese or iron in metal form, or with cobalt di-(cyclopentadienyl).Vanadium-arenes are useful in the preparation of catalyst components active in ethylene polymerization, or in the copolymerization of ethylene in an alpha-olefin.

Abstract: A process is described for the preparation of oxamide derivatives wherein one or both --NH.sub.2 groups are replaced by primary or secondary amino groups, through reaction of oxamide with a suitably selected amine of formula RR.sup.1 NH wherein R represents a substituted straight or branched (C.sub.2 -C.sub.12)alkyl radical wherein the substituent(s) or at least one of the substituents is selected from the group consisting of hydroxy, amino, mono-substituted amino, and di-substituted amino, and R.sup.1 represents hydrogen or an optionally substituted (C.sub.1 -C.sub.6)alkyl radical; representative oxamide derivatives which can thus be obtained useful as corrosion inhibitors, intermediates for polymers, polymer stabilizers, and slow-release fertilizers, are also described.

Abstract: Linear olefins are converted into the corresponding secondary alcohols by treatment with methyl alcohol and a tertiary alcohol, in the presence of an acidic catalyst, at a temperature ranging from 120.degree. to 200.degree. C. The product mixture substantially consists of the desired secondary alcohol and of the methyl ether of the charged tertiary alcohol.The reaction products can be easily isolated by fractionation, or, in some instances, the liquid product mixture can be used as such.Of particular interest is the direct hydration of n-butenes using tert-butyl alcohol as the tertiary alcohol. The obtained product mixture can be used as such, as an additive to methanol-containing gasolines for internal combustion engines.

Abstract: A new process for preparing N,N'-bis-(2-hydroxyethyl)-piperazine (I) ##STR1## is described which involves reaction of oxamide with excess diethanolamine at a temperature of from 50.degree. to 268.degree. C.

Abstract: A tough and long-lasting adhesion of polyolefins to metal substrates is realized by means of a process comprising the following four process steps, carried out in succession:(a) mechanical cleaning of the metal surface;(b) treatment of the metal surface with a water-alcohol solution containing at least an alkoxysilane and boric acid;(c) thermal treatment of the surface coming from the (b) step;(d) treatment of the so-treated surface with a polyolefin based composition, containing zeolites and carbon black.

Abstract: Metallizable, thermoweldable polyolefin films, endowed with good gas-barrier properties, are obtained by means of a process which comprises the following steps, carried out in sequence:(a) treatment of the surface of the film with an argon plasma;(b) deposition of a thin layer of liquid alkoxy-silanes on the surface of the so-treated film;(c) treatment of the alkoxy-silane coated film with an argon-oxygen plasma.

Abstract: Boron compounds are separated and recovered from a geothermal brine, which additionally contains inorganic salts, such as sodium and potassium chlorides and sulphates, by means of a process comprising the following process steps:(a) pre-concentration of the geothermal brine by expansion up to room pressure, to a pressure lower than room pressure;(b) concentration of the pre-concentrated brine, coming from the (a) step, by means of an osmotic treatment against a concentrated aqueous solution of recycled inorganic salts;(c) treatment of crystallization of the concentrated brine, coming from the (b) step, with the separation of the solid inorganic salts from an aqueous solution of boron compounds;(d) recycle of the inorganic salts separated in the (c) step, to the (b) step of osmosis, in the form of a concentrated aqueous solution; and(e) recovery of boron compounds from the relevant aqueous solution obtained in the (c) step.

Abstract: A new method of synthesis of a 2,2-dialkoxy-propane e.g. 2,2-dimethoxy-propane, is described through reaction of a cyclic ketal, e.g. 2,2-dimethyl-(1,3)-dioxolane, with a boric acid alkyl ester, e.g. boric acid trimethyl ester, in the presence of an acidic catalyst. The reaction may be carried out either in liquid or in vapor phase. In the latter case, heating of the thus obtained intermediate mixture to the reflux temperature should follow the catalytic step.