Snia Viscosa S.p.a. Societa Nazionale Industria Applicazioni Viscosa

Snial Resine Poliestere S.p.a.

Comitoto Nazionale Per L'energia Nucleare

Shia Viscosa Societa Nazionale Industria Applicazioni Viscosa S.p.a.

Snia Viscosa Societa' Nazionale Industria Aplicazioni Viscosa Spa

Giancarlo Carignani

Aldo Cipriani

Massimo Mazzola

Elvio Bertotti

Aldo Donato

Giuseppe Grossi

Luigi Arcuri

A composition of matter suitable for solidifying radioactive wastes is formed of unsaturated polyester resins comprising a polyester (I) obtained polycondensing (a) maleic anhydride and/or maleic and/or fumaric acid, (b) isophthalic and/or terephthalic acid, (c) neopentylglycol, (d) optionally one or more conventional glycols, wherein the amount of (c) is at least 50% by moles with respect to (c)+(d); another polyester (II) obtained polycondensing (a) maleic anhydride and/or maleic and/or fumaric acid, (b) isopropylidene-bis-(phenylene-oxypropanol-2), (c) optionally one or more conventional glycols, wherein the amount of (b) is at least 50% by moles with respect to (b)+(c); an ethylenically unsaturated monomer (III) capable of copolymerizing with (I) and (II); inhibitors, initiators, accelerators, glass fibers and other conventional additives and fillers the weight ratio of component (I) to (II) being from 100:0 to 20:80.

Composition of matter suitable for solidifying radioactive wastes,

Process for obtaining cellular materials, based on unsaturated polyester in optionally containing reinforcing and/or inert fillers, having a density between 0.2 and 1.0 kg/l by moulding under pressure a liquid foam of said resins, characterized by the fact that the liquid foam based on unsaturated polyester resins containing conventional additives, optionally containing an inert and/or reinforcing charge of mineral or organic fibers having a length which is less than 5 mm, preferably less than 3 mm and more preferably less than 1.5 mm, obtained by mechanical introduction of a gas and/or by means of a chemical and/or physical foaming agent, is firstly introduced into an open half-mould optionally containing a further fiber reinforcement, by casting an amount higher than the free volume of the mould, and subsequently said foam is cross-linked.

Process for obtaining cellular materials based on unsaturated polyester

A process for obtaining cellular materials from unsaturated polyester resins reinforced with fillers having a density below 0.7 kg/lt by injecting a liquid foam, made from the resins by mechanical introduction of a gas therein into a closed mold, is described. The liquid foam, obtained from polyester resins including additives and optionally a reinforcement of synthetic, artificial, vegetable or mineral fibres having a length lower than 5 mm, and optionally containing a low boiling foaming agent, is injected voluminized and cross-linked in the hot or in the cold in a closed mold containing a reinforcing agent of synthetic, artificial, vegetable or mineral fibers as a monofilament mat, a cut fibre mat, a mono or bidirectional roving woven mat, rovings, fabrics.

Process for obtaining reinforced cellular materials based on unsaturated

Process for the preparation of permanently self-extinguishing cellular maials essentially comprising brominated unsaturated polyester resins, containing conventional additives, having a density comprised between 300 and 700 g/l correlated to a resistance to compression, as of a formed product, higher than the curve shown in the attached FIG. 1, said process being characterized by the fact that a brominated unsaturated polyester resin, containing an amount of bound bromine comprised between 10 and 30%, preferably between 12 and 25% by weight, containing conventional additives, is subjected to foaming by mechanical incorporation therein of a gas or a gas mixture, until crosslinkable liquid foams are obtained, which latter are subsequently subjected to crosslinking by conventional methods. The present invention further refers to permanently self-extinguishing cellular materials thus obtained.

Process for obtaining permanently self-extinguishing cellular materials

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Rome, Italy

Giancarlo Carignani