Ausimont

Rossella Silvani

Simonetta Antonella Fontana

Giuseppe Marchionni

Ezio Strepparola

Patrizia Serenella Maccone

Gianfranco Spataro

Julio A Abusleme

Padmanabhan Srinivasan

Casimiro Pace

Valerio Carsetti

Use of fluorinated liquids

De-oiling composition of perfluoropolyethers and hydrofluoropolyethreal surfactants

Method for the water removal from a surface, which comprises covering the surface with a composition having specific weight higher than that of the water, and subsequently removing water from the composition by skimming, such composition comprising a (per)fluoropolyether having molecular weight comprised between 300 and 1500 and a non ionic additive having a (perfluoropolyethereal structure similar to that of the solvent, linked to an hydrogenated part of hydrophilic type, the molecular weight of the (per)fluorinated part is comprised between 400 and 1200 and the ratio by weight between (per)fluorinated part and hydrogenated part is comprised between 1.5 and 3.5.

Composition for the removal of water from a surface

Compositions used to remove traces of water and/or organic solvents and/or oils from the component surfaces, comprising:

Compositions to remove water and/or solvents

Use of solvents capable of removing oily substances without solubilizing them, consisting of hydrofluoropolyethers having the general formula

Solvent cleaning agents including additives of the formula R.sub.f

Method for the water removal from a surface, which comprises covering the surface with a composition having specific weight higher than that of the water, and subsequently removing water from the composition by skimming, such composition comprising a (per)fluoropolyether having molecular weight comprised between 300 and 1500 and a non ionic additive having a (per-fluoropolyethereal structure similar to that of the solvent, linked to an hydrogenated part of hydrophilic type, the molecular weight of the (per)fluorinated part is comprised between 400 and 1200 and the ratio by weight between (per)fluorinated part and hydrogenated part is comprised between 1.5 and 3.5.

Method for the removal of water from surfaces

Method of removing oily substances with hydrogen-terminated

Ternary mixtures, particularly suitable for removing oily substances having both an hyrogenated and fluorinated or mixed basis, essentially consisting of: (a) water; (b) terbutanol; (c) a fluoropolyoxyalkylene having hydrogenated end groups and/or hydrogenated repetitive units. Such mixtures have high flash point, are non toxic and with null depleting potential of the ozone and show a ternary diagram characterized by a wide monophasic zone, wherein the three components form limpid and stable solutions.

Ternary mixtures of solvents and their use for removing oily substances

The invention relates to a process for reducing the back migration of the most volatile fractions of perfluoropolyethers during the operation of mechanical vaccum-generating pumps which utilize perfluoropolyethers: use is made of perfluoropolyethers containing not more than 0.1% by weight of fractions having a molecular weight lower than or equal to 1,500 and not more than 1.3% by weight of fractions having a molecular weight lower than or equal to 1,800.

Growing community of inventors

Lentate sul Seveso, Italy

Rossella Silvani