Abstract: Getter composition to be used for controlling the amount of moisture and organic gases in sealed electronic or optoelectronic devices, said composition comprising a blend of first getter and second getter powders in a weight ratio comprised between 0.1 and 5.0, wherein the first getter is polyphenylene oxide (PPO) or Poly(2,6-diphenyl-p-phenylene oxide) (PPPO) and the second getter is a Faujasite (FAU) zeolite or a mixture of a Faujasite (FAU) zeolite and a Linde Type A (LTA) zeolite with a ratio comprised between 0.1 and 5.0. The invention also relates to a dispensable paste comprising a resin and the getter composition.

Abstract: Getter composition to be used for controlling the amount of moisture and organic gases in sealed electronic or optoelectronic devices, said composition comprising a blend of first getter and second getter powders in a weight ratio comprised between 0.1 and 5.0, wherein the first getter is polyphenylene oxide (PPO) or Poly(2,6-diphenyl-p-phenylene oxide) (PPPO) and the second getter is a Faujasite (FAU) zeolite or a mixture of a Faujasite (FAU) zeolite and a Linde Type A (LTA) zeolite with a ratio comprised between 0.1 and 5.0. The invention also relates to a dispensable paste comprising a resin and the getter composition.

Abstract: Curable polymeric compositions with improved barrier property to oxygen suitable to be used on flexible substrates containing a bisphenol F epoxy resin, at least an epoxy acrylate component and at least a rubber modified bisphenol and further comprising EVOH capsules or beads dispersed therein. The polymeric compositions are applicable either by a melt or liquid coating technique and undergo curing upon exposure to heat, showing viscoelastic properties and suitable to provide a cured product having high durability.

Abstract: Curable polymeric compositions with improved barrier property to oxygen suitable to be used on flexible substrates containing a bisphenol F epoxy resin, at least an epoxy acrylate component and at least a rubber modified bisphenol and further comprising EVOH capsules or beads dispersed therein. The polymeric compositions are applicable either by a melt or liquid coating technique and undergo curing upon exposure to heat, showing viscoelastic properties and suitable to provide a cured product having high durability.

Abstract: A desiccant composition is described. The desiccant composition has a polymeric binder and a dispersion of powders of hygroscopic inorganic oxides as desiccant materials, in which the desiccant powders are finely dispersed in consequence of their surface-modification by fatty acid anions without affecting their moisture sorption performances.

Abstract: A desiccant composition is described. The desiccant composition has a polymeric binder and a dispersion of powders of hygroscopic inorganic oxides as desiccant materials, in which the desiccant powders are finely dispersed in consequence of their surface-modification by fatty acid anions without affecting their moisture sorption performances.

Abstract: A desiccant composition containing a polymeric binder and a dispersion of powders of desiccant materials is described. The desiccant composition has desiccant powders that are dispersed at least in part in form of micro-aggregates of desiccant particles surrounded by a polymeric encapsulating material having a different composition with respect to the polymeric binder.

Abstract: A desiccant composition containing a polymeric binder and a dispersion of powders of desiccant materials is described. The desiccant composition has desiccant powders that are dispersed at least in part in form of micro-aggregates of desiccant particles surrounded by a polymeric encapsulating material having a different composition with respect to the polymeric binder.

Abstract: Nitric acid having a concentration of at least 98% by weight is obtained from a gaseous stream resulting from catalytic oxidation of ammonia and containing nitrogen oxide and steam, by flowing said stream in an oxidation and condensation column in countercurrent with a stream of nitric acid at 40-60 wt.%, recovering nitrogen peroxide at the top of the column, liquefying said peroxide, bringing it into contact with aqueous nitric acid, oxygen and air in a chemical absorption stage, and distilling the resulting superazeotropic nitric acid. A part of the nitric acid discharged from the oxidation column is directly recycled and the remainder is recycled after distillation to give azeotropic acid and remove water, a part of the latter being used for the chemical absorption.

Abstract: Nitric acid having a concentration of at least 98 wt.% is produced from nitrogen peroxide by absorbing the latter in superazeotropic nitric acid, distilling the resulting solution so as to recover nitric acid at a concentration of at least 98 wt.% and nitrogen peroxide, liquefying the latter and reacting it in a first stage with aqueous nitric acid (70-80% wt.%) and air and delivering the resulting superazeotropic nitric acid, together with the solution, to the distillation column. Nitrogen peroxide and oxygen unreacted in the first stage are contacted with nitric acid at 68-75 wt.% in a second stage, thus to produce said aqueous nitric acid fed to the second stage. The said nitric acid at 68-75 wt.% and the superazeotropic acid used for the absorption are extracted from the bottom part of the distillation column.

Abstract: Nitric acid having a concentration of at least 98 wt.% is prepared by recovering in liquid state nitrogen peroxide from a gaseous flow containing the same, by absorption in nitric acid, heating of the resulting solution and liquefaction of the gaseous peroxide evolved, followed by a first chemical absorption of a fraction of the liquid peroxide with nitric acid at 70-80% and air and distillation of the resulting concentrated nitric acid. The gaseous products discharged from said first absorption and comprising unreacted peroxide and air are contacted with nitric acid and water in a second chemical absorption stage, thereby to produce the nitric acid used in the first absorption. The remaining fraction of liquid peroxide is delivered to the distillation column, discharged at the top thereof and recycled to the liquefaction stage, while nitric acid is extracted at the bottom of the distillation column and recycled to the second absorption stage.