Ausimont

Ausimont S.r.l.

Nippon Zeon Company, Ltd.

Ausimonto S.p.a.

Anna M Staccione

Giuseppe Marchionni

Antonio Marraccini

Antonio Pasquale

Julio A Abusleme

Vincenzo Arcella

Walter Navarrini

Margherita Albano

Marco Apostolo

Vittorio Montanari

Giulio Brinati

Pier Antonio Guarda

Ivan Diego Wlassics

Stefano Turri

Alberto Zompatori

Giuseppe Marchinonni

Sergio Novelli

Curable (per)fluoropolyether polyurethanes obtained by reaction in a first step of

Curable polyurethanes

Curable fluoroelastomers

Blends of fluorinated and acrylic elastomers

Fluoropolymers comprising a fluoroelastomer matrix incorporating therein particles of a semicrystalline fluoropolymer containing iodine and/or bromine and formed of tetrafluoroethylene (TFE) homopolymers or copolymers wherein the average particle sizes of the semicrystalline fluoropolymer latex range from 10 to 100 nm.

Fluoroelastomer compositions

Curable fluoroelastomeric compositions

O-rings obtainable from vinylidenfluoride (VDF)-based ionically cured copolymers having compression set lower than 20%.

O-rings from ionically curable fluoroelastomers

Compounds comprising a peroxide and a peroxide curable blend essentially consisting of hydrocarbon elastomers containing at least an acrylic monomer and of fluorinated VDF-based elastomers having in the polymer chain at least 5% by moles of hydrogenated groups C.sub.1 of the type ##STR1## --CH.sub.2 -- and/or --CH.sub.3, the amount of fluorinated rubber in the elastomeric blend being comprised from 5 to 75% by weight, said elastomers of the blend not containing iodine and/or bromine.

This invention relates to perfluoropolyethers having neutral end groups by a process based on the photooxidation of C.sub.3 F.sub.6 and/or C.sub.2 F.sub.4, thereby obtaining controlled molecular weight products having perfluoroalkyl or perfluorochloroalkyl neutral end groups, with high yields of useful products.

Process for preparing controlled molecular weight perfluoropolyethers

This invention relates to a process for preparing perfluoroalkoxysulphonic compounds having formula: ##STR1## wherein R.sub.f represents a perfluoroalkyl or perfluoroethereal group, X represents F, OH or OM, in which M is an alkaline cation, an alkaline-earth cation, or X represents NR.sub.1 R.sub.2, in which R.sub.1 and R.sub.2, independently of each other, represent H or an alkyl group containing from 1 to 5 carbon atoms and p is a number selected from 1 to 2, characterized in that the perfluoro vinyl sulphonyl fluoride of formula (II) CF.sub.2 =CF--SO.sub.2 F is reacted with a hypofluorite of formula (III):

Process for preparing perfluoroalkoxysulphonic compounds

Peroxy perfluoropolyoxyalkylenes are prepared with high yields by carrying out the photo-oxidation of tetrafluoroethylene with molecular oxygen, by means of ultraviolet radiations, operating in the presence of pentafluorochloroethane as a solvent for tetrafluoroethylene. Thus, it is possible to obtain peroxy perfluoropolyoxyalkylenes having a viscosity at 20.degree. C. ranging from 300,000 to 8,000,000 cSt and endowed with a peroxide content not higher than 4. Such perfluoropolyoxyalkylenes provide, through chemical reduction, perfluoropolyoxyalkylenes endowed with a functionality higher than 1.9 and at the same time with a high molecular weight.

Perfluoropolyoxyalkylene endowed with a high viscosity and a low

The invention relates to new peroxide perfluoropolyethers having formula: ##STR1## wherein: A and B are end groups,

Perfluoropolyethers and processes for their preparation

Perfluoropolyethers having an acid end group of the type of acyl fluoride (or chloride) or a carboxylic group or derivatives thereof, the other end group being a perfluoroalkyl containing one or two halogen atoms different from fluorine, are prepared by photooxidation of C.sub.3 F.sub.6 and/or C.sub.2 F.sub.4, in the presence of a fully halogenated ethylene containing 1 to 4, preferably 1 or 2 atoms of halogen different from fluorine, and by the subsequent thermal of photochemical decomposition treatment of the peroxide groups which are present in the photooxidation product.

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Milan, Italy

Anna M Staccione