Enichem Synthesis S.p.a

Enichem Sintesi S.p.a.

Enichimica S.p.a.

Claudio Gagliardi

Franco Rivetti

Fiorenzo Renzi

Ugo Romano

Pietro Allegrini

Umberto Sgambato

A polymerizable liquid composition includes

Composition and procedure for the preparation of organic glasses

An organic glass with improved impact strength and with a refractive index equal or similar to that of mineral glass (crown glass), is composed of the product of the radicalic polymerization of the polymerizable liquid composition obtained by the transesterification of:

Organic glass with improved impact strength and with a refractive index

Liquid polymerizable composition for the production of high refractive

A liquid composition which can undergo radical polymerization to produce an almost colorless and easily dyeable organic glass, containing (i) at least one poly(allyl carbonate) of a polyhydroxy alcohol having from 2 to 20 carbon atoms and from 2 to 6 hydroxy groups in the molecule, and (ii) at least one aliphatic polyol having from 2 to 5 hydroxy groups in the molecule, in quantities from 0.01 to 1% by weight on the whole composition.

Polymerizable composition comprising poly(allyl carbonate) of

Organic glasses and surface coatings are prepared, with short hardening cycles, by submitting to the action of U.V. light a liquid polymerizable composition containing at least one di-(allyl carbonate) or poly(allyl carbonate) of a diol or polyol, a photoinitiator and a vinyl ester monomer and/or an organic peroxide. The composition can additionally contain small amounts of an organic compound selected from among those compounds which are used in the art in order to stabilize the organic polymers to the degrading action of U.V. light. The composition is preferably heated before being treated with U.V. light.

Process for preparing organic glasses

Substitutes for optical glasses are obtained by submitting to polymerization, in the presence of a free-radical initiator and in bulk, a polymerizable liquid composition containing:

Process for the preparation of substitutes for optical glasses and

A liqid composition polymerizable under the influence of free-radical initiators to yield crosslinked polymers useful as organic glasses endowed with high abrasion strength, contains an oligomer allyl-carbonate with two end allyl groups, a monomer allyl-carbonate with at least four end allyl groups and possibly also one or more reactive diluents containing groups of allyl, vinyl or methacryl type.

Liquid and polymerizable composition suitable for the production of

A polymerizable liquid composition is disclosed, intended for preparing polymerizates having outstanding optical and physical properties, said composition consisting of a bis (allylcarbonate) of a dihydric alcohol oligomer, a bis (allylcarbonate) monomer of a dihydric or a trihydric alcohol, or an allyl ester, or a triallyl cyanurate or isocyanurate, and an acrylic or vinylic monomer, said composition being polymerized in bulk with the aid of at least one radicalic initiator. Highly transparent articles are obtained, which are very useful for fine optical applications.

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San Donato Milanese, Italy

Claudio Gagliardi