Abstract: A process for preparing an SOI structure with a deep thin oxide layer which comprises, in succession, a first ion implantation at an oxygen fluence within the range of 10.sup.15 -10.sup.16 ions/cm.sup.2, thermal treatment at a temperature within the range of 600.degree.-900.degree. C., a second ion implantation at an oxygen fluence within the range of 2.times.10.sup.17 -8.times.10.sup.17 ions/cm.sup.2, and a final thermal treatment at a temperature within the range of 1150.degree.-1400.degree. C.

Abstract: A method for preparing inorganic oxide-based materials of spherical form with substantially monomodal distribution, consisting of forming a sol of at least one of the inorganic oxides of interest, adding to said sol a solvent immiscible with the sol, finely dispersing the obtained two-phase mixture into a dispersion of particles of equal diameter, growing said particles by limited coalescence to the desired diameter, gelling said mixture by adding a second solvent containing a gelling agent, and removing the solvent.

Abstract: Blends of an aromatic polysulfone (PSF) and aromatic alkyl methacrylates (PAAM) form thermodynamically miscible mixtures. They exhibit only one glass transition over a wide range of compositions and show marked improvement in mechanical and thermal properties compared to binary mixtures of PSF and other methacrylate or styrenic polymers. Furthermore, they possess better processing and workability without unwanted thermal decomposition owing to better flow properties at relatively lower temperatures.

Abstract: Hydroxyl group-containing triglyceride oils are effective nucleating agents for poly(ethylene terephthalate) and provide improved crystallization properties. The hydroxyl group-containing triglyceride oil may be combined with a conventional organic acid metal salt nucleating agent. By covalently bonding the hydroxyl group-containing triglyceride oil with a metal carboxylate, improved crystallization properties are obtained.

Abstract: Polycarbonates (PC) can be blended over all compositions with block copolymers containing stereoregular polymethyl methacrylate (s-PMMA) in which at least 60% of the monomer units are in the syndiotactic configuration to form modified but transparent polycarbonates for a number of applications. Additional homopolymers corresponding to the blocks of the copolymer may also be added to even further modify the properties of the polycarbonate while still retaining transparency.

Abstract: A method for grafting hydrophilic monomers containing double bonds onto polymer surfaces in aqueous solution.The grafting is activated by ultraviolet radiation and by the presence in suspension of a photoactivator of controlled particle size distribution.

Abstract: A method for preparing inorganic oxide-based materials of spherical form with substantially monomodal distribution, consisting of forming a sol of at least one of the inorganic oxides of interest, adding to said sol a solvent immiscible with the sol, finely dispersing the obtained two-phase mixture into a dispersion of particles of equal diameter, growing said particles by limited coalescence to the desired diameter, gelling said mixture by adding a second solvent containing a gelling agent, and removing the solvent.

Abstract: The present invention relates to fast-crystallizing polyester compositions comprising: (a) a thermoplastic polyester resin; (b) a nucleating agent of the formula: ##STR1## wherein: R is an alkali or alkaline-earth metal; m is 1, 2 or 3; n takes an average value within the range of 1 to 5; said nucleating agent being optionally admixed with the compound of formula (I) wherein R is a hydrogen atom, linear alkyl radial or branched alkyl radical each having from 1 to 6 carbon atoms; with the proviso that at least 50% mole of said nucleating agent is in the salt form. This nucleating additive raises the crystallization temperature upon cooling (T.sub.cc) of the polyester so that crystallization occurs rapidly during molding.

Abstract: The present invention relates to quaternary .beta.-hydroxy-alkyl-ammonium halides and quaternary .beta.-hydroxy-cycloalkylammonium halides, which are liquid at temperatures lower than 60.degree. C., are easily and rapidly miscible in liquid epoxides, as well as in liquid poly-isocianates, generating liquid compositions which spontaneously polymerize, with fast polymerization rate, already at temperatures comprised within the range of from 0.degree. C. to 60.degree. C., yielding a solid, insoluble polymeric material endowed with very high values of softening temperature.

Abstract: Polycarbonates (PC) can be blended over all compositions with block copolymers containing polyaromatic(alkyl)methacrylates (PAAM) to form modified but transparent polycarbonates for a number of applications. Furthermore, additional homopolymers corresponding to those in the block copolymer may also be added to further modify the properties of the polycarbonate while still retaining transparency. Polycarbonate plus PAAM block copolymers containing from 1 to 99% by weight PC behave as transparent materials with the PC and the PAAM block forming a continuous, single phase material.

Abstract: A process for increasing the crystallization rate and crystallization temperature of thermoplastic polyesters by incorporating into the polyesters quaternary ammonium salts in amounts effective to increase the crystallization temperatures of the polyesters at least 15.degree. C., which quaternary ammonium salts are substantially free of metal salts of organic acid functional groups. Molding compositions of thermoplastic polyesters and quaternary ammonium salts present in amounts effective to increase the crystallization temperatures of the polyesters at least 15.degree. C.

Abstract: A process for coating the surface of bodies fabricated from polymeric materials with inorganic films by depositing on the polymeric bodies a thin layer obtained by thermal evaporation, under vacuum, of glass/silicon mixtures. The process provides for improved control of surface-depending properties, such as wettability, haze resistance, gas and weight barrier properties and selective absorption of ultraviolet light.

Abstract: Low-crystallization-speed polyesters obtained by means of the polycondensation of 2,6-naphthalene-dicarboxy acid with at least one (C.sub.2 -C.sub.10)-(cyclo)alkylene glycol in the presence of 0.5-50 mol % of a copolymerizable reactant of general formula:ROOC--Ar--OOC--Ar'--COO--Ar--COOR (I)wherein Ar and Ar' stand for aromatic radicals, and R stands for a hydrogen atom or a (C.sub.1 -C.sub.4)-alkyl radical, or the OR group is replaced by a halogen.

Abstract: Thermoplastic compositions comprising:(a) from 55 to 85% by weight of at least one aromatic polyester;(b) from 10 to 40% by weight of at least one elastomeric copolymer constituted by 45-90 mol % of ethylene, 5-50 mol % of an alkyl acrylate or alkyl methacrylate, in which the alkyl moiety contains from 1 to 8 carbon atoms, 0.3-5 mol % of an unsaturated epoxide;(c) from 0.5 to 5% by weight of at least one elastomeric copolymer constituted by 45-90 mol % of ethylene, 5-50 mol % of an alkyl acrylate or alkyl methacrylate, in which the alkyl moiety contains from 1 to 8 carbon atoms, 0.1-5 mol % of monomeric units functionalized with amido-aminic and/or imido-aminic moieties;with the total of the percentages of components (a), (b) and (c) equating 100.

Abstract: Carbonate monomers are polymerized in the presence or absence of a polymerization initiator by irradiation with electromagnetic radiation in the absence of solvent or diluent.

Abstract: Continuous biotechnological preparation of optical isomer S(+) of 2-(6-methoxy-2-naphthyl) propionic acid consisting in the reaction of a racemic (R,S) ester of 2-(6-methoxy-2-naphthyl) propionic acid having melting point below 50.degree. C. of formula: ##STR1## wherein R.sub.1 =a C.sub.2 -C.sub.10 alkyl, C.sub.4 -C.sub.6 cycloalkyl, phenyl, tetrahydropyranyl , tetrahydrofuranyl radicals and--(CH.sub.2 CH.sub.2 O).sub.n --R.sub.2 group, whereinn=2-15 andR.sub.2 =a C.sub.1 -C.sub.4 alkyl group, with the Lipase obtained from Candida Cylindracea, at temperatures ranging from 20.degree.-60.degree. C. and at a pH ranging from 5 to 8, by feeding said ester in a continuous way into a bioreactor containing said Lipase immobilized on a porous carrier selected from adsorbent resins of the polyacrylester type having a porosity ranging from 50 to 1000 .ANG. and a granulometry ranging from 1 to 0.01 mm.

Abstract: Copolyesters having an improved combination of barrier, mechanical, thermal and rheological properties and consisting of acylic and glycolic radicals, wherein the acylic radicals derive from at least isophthalic acid and 2,6-naphthalene dicarboxylic acid and at least 90% by mols of the glycolic radicals derive from ethylene glycol.

Abstract: In order to reduce the rate of coke formation during the industrial pyrolysis of hydrocarbons, the interior surface of the reactor tubes are coated with a thin layer of a ceramic material, said layer being deposited by thermal decomposition of a non-oxygen containing silicon organometallic precursor in the vapor phase, in an inert or reducing gas atmosphere in order to minimize the formation of oxide ceramics.

Abstract: A procedure is described for the preparation of compounds having a bicyclo[3.2.0]heptenonic structure corresponding to the formula: ##STR1## wherein R.sub.1 and R.sub.2, the same or different are hydrogen or a C.sub.1 -C.sub.4 alkyl.The compounds corresponding to formula (I) can be used as intermediates or precursors of pheromones, prostaglandins and antibiotics.

Abstract: Procedure for the continuous fractionation of polymers dissolved in a solvent, which includes at least one complete cycle of the following operations:a. precipitation of a first fraction of polymer inside a first reaction vessel containing the solution;b. transferring the remaining solution into a second reaction vessel and collecting the above first fraction of polymer precipitated in the above first reaction vessel;c. precipitation of a second fraction of polymer inside the second reaction vessel; andd. recycling the remaining solution in the first reaction vessel and collecting the above second fraction of polymer precipitated in the above second reaction vessel.