Abstract: A catalyst active in the preparation of alternating olefin/carbon monoxide (CO) copolymers is constituted by:(a) at least one salt of a metal of Group IB of the Periodic System,(b) a mono or bidentate ligand base containing one or two nitrogen or phosphorus atoms capable of linking to the metal atom by means of dative bonds,(c) a mineral or organic oxidizer agent.Also disclosed are the preparation of the catalyst and the use of said catalyst in alternated copolymerization of ethylene (C2) and/or other olefins with carbon monoxide (CO).

Abstract: Polyester compositions with a high crystallization rate obtained by mixing, at a high temperature, a polyester resin with at least one organic compound having the general formula:ROOC--Ar--OOC--Ar'--COO--Ar--COOR (I)where R represents a hydrogen atom or a C.sub.1 -C.sub.4 alkyl radical whereare Ar and Ar', either the same or different, represent a simple or condensed aromatic radical containing from 6 to 12 carbon atoms, and cooling the mixture thus obtained to room temperature.

Abstract: A catalyst active in the preparation of alternating olefin/carbon monoxide (CO) copolymers is constituted by:(a) Pd(O.sub.2 CNEt.sub.2).sub.2 (NHEt.sub.2).sub.2 supported on a solid carrier preferably constituted by hydroxylated silica,(b) an either mono- or bidentate ligand containing one or two nitrogen or phosphorous atoms capable of linking to Pd atom by dative bonds,(c) NOBF.sub.4.Disclosed are the preparation of the catalyst and the use of said catalyst in alternated copolymerization of ethylene (C2) and/or other olefins with carbon monoxide (CO).

Abstract: Formed articles having improved surface properties, such as wettability, printability, adhesion, antistaticity and clouding resistance, consisting of a polymeric finished article or semi-finished article coated on at least a surface with a polyhydroxethylacrylate layer, preferably prepared by means of plasma polymerization.

Abstract: A catalyst active in the preparation of alternating olefin/carbon monoxide (CO) copolymers is constituted by:(a) Pd(O.sub.2 CNEt.sub.2).sub.2 (NHET.sub.2).sub.2 supported on a solid carrier preferably constituted by hydroxylated silica,(b) an either mono- or bidentate ligand containing one or two nitrogen or phosphorous atoms capable of linking to Pd atom by dative bonds,(c) a mineral or organic acid.Disclosed are the preparation of the catalyst and the use of said catalyst in alternated copolymerization of ethylene (C2) and/or other olefins with carbon monoxide (CO).

Abstract: Process for preparing straight, alternate polymers based on carbon monoxide and at least one olefin, which comprises causing carbon monoxide and the olefin to react in the presence of:(a) a catalyst of general formula (I):[Pd(chel)(chel')]++[A-].sub.2 (I)wherein chel and chel', which may be the same, or different from each other, represent a bidentate chelating agent and A- stands for an anion of an acid having a pKa smaller than 6; and(b) optionally, an organic oxidizer agent.

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 multicomponent adhesive composition of:(A) an elastomer dissolved in a polymerizable acrylic component;(B) a polymerization starter selected from peroxides, hydroperoxides, peracids, peresters, oxaziridines and fluorinated oxaziridines;(C) a starter-activating agent; and(D) a starter stabilizing agent selected from cyclodextrins, calyxarenes and cavitands.

Abstract: The invention provides acrylic-based heat-resistant bicomponent structural adhesives comprising:a) a first adhesive component consisting of:an elastomer;a monofunctional acrylic monomer;a free radical generator;a solution stabilizer;an adhesion promoter;a cross-linking agent;a heat stabilizer for the adhesive, chosen from maleimide derivates containing acrylic residues; andb) a second component activating the first adhesive component and consisting of:a mixture of aldehyde-amine condensation products;an organic salt of a metal of the first transition series of low oxidation state.

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: Polyesters with a high crystallization rate synthesized by the polycondensation of terephthalic acid with at least one C.sub.2 -C.sub.4 alkylenic glycol in the presence of 0.1-1.5 mol % of a copolymerizable reagent having the general formula:ROOC--Ar--OOC--Ar'--COO--Ar--COORwhere Ar and Ar'represent aromatic radicals and R represent a halogen, a hydrogen atom or a C.sub.1- C.sub.4 alkyl radical.

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: Low-crystallization-speed polyesters obtained by means of the polycondensation of terephthalic acid with at least one (C.sub.2 -C.sub.10)-(Cyclo)alkylene glycol in the presence of 2-50 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: 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: 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.

Abstract: Process of photoetching of superficial coatings based on polymeric material comprising the irradiation of the coated surface with localized excimer laser beams having wavelengths equal to or lower than 193 nm.