Enichem S.p.a

Istituto Guido Donegani S.p.a.

Eniricerche S.p.a.

Fabrizio Parodi

Mark T DeMeuse

Carla Zannoni

Carlo Belgiovine

Renata Gerbelli

Angelo Nora

Charles L Ryan, Jr

Mark De Meuse

Liquid reactive thermosetting compositions comprising:

Liquid reactive thermosetting compositions and process for their

Crosslinkable liquid composition based on organic isocyanates and epoxy compounds, comprising the following components:

Microwave-polymerizable isocyanate/epoxy resins for heavy-duty

Reactive compositions liquid at a temperature lower than 70.degree. C., comprising: A) at least one organic polyisocyanate; B) a mono- or poly-epoxide, or a mixture of different mono- and/or poly-epoxides: C) a catalyst, liquid at a temperature lower than 70.degree. C., consisting of a solution of at least one alkali metal halide in a polyoxyalkylenic compound or in a mixture of different polyoxyalkylenic compounds, said polyoxyalkylenic compound containing at least one hydroxyl group of alcoholic type. These reactive compositions are able to gel and solidify rapidly at temperatures between 0.degree. and 70.degree. C., to form a glassy polymer of high softening point.

Liquid reactive compositions comprising polyisocyanates, epoxides and

Mixtures of polyisocyanates and epoxides are cured by microwave irradiation, optionally with microwave or thermal post-curing to produce cured polymer articles having good chemical, electrical and mechanical properties.

Process for curing polymerizable liquid compositions based on

The present invention relates to quaternary .beta.-hydroxy-alkyl-ammonium halides and quaternary .beta.-hydroxy-cycloalkylammonium halides, which are liquid at temperatures lower than 60.degree. C., are easily and rapidly miscible in liquid epoxides, as well as in liquid poly-isocianates, generating liquid compositions which spontaneously polymerize, with fast polymerization rate, already at temperatures comprised within the range of from 0.degree. C. to 60.degree. C., yielding a solid, insoluble polymeric material endowed with very high values of softening temperature.

Liquid catalysts for rapid polymerization of liquid compositions bases

Carbonate monomers are polymerized in the presence or absence of a polymerization initiator by irradiation with electromagnetic radiation in the absence of solvent or diluent.

Microwave processing of carbonate monomers

Liquid-crystalline, completely aromatic copolyesters are disclosed, which are endowed with a heat stability not lower than 350.degree. C., and are constituted by a succession of repeatitive units containing: ##STR1## wherein A and B, which can be either equal to, or different, from, each other, can be either --0-- or and one of the following moieties: ##STR2## in which Ar can be 1,4-phenylene, 2-monosubstituted-1,4-phenylene or 4,4'-diphenylene. Also copolyesters also containing amidic bonding groups are disclosed.

Thermotropic liquid-crystalline aromatic coplymers

Liquid-crystalline, completely aromatic copolyesters are disclosed, which are endowed with a heat stability not lower than 350.degree. C., and are constituted by a succession of repetitive units containing: ##STR1## wherein A and B, which can be either equal to, or different, from, each other, can be either --O-- or --CO-- and one of the following moieties: ##STR2## in which Ar can be 1,4-phenylene, 2-monosubstituted-1,4-phenylene or 4,4'-diphenylene. Also copolyesters also containing amidic bonding groups are disclosed.

Thermotropic liquid-crystalline aromatic copolymers

A reactive composition, rapidly polymerizable already starting from room temperature, comprises a liquid mixture consituted by at least one organic polyisocyanate, at least one compound containing one or more epoxy groups and a liquid catalyst constituted by, or containing, at least one compound falling within the scope of the general formula ##STR1## in which the substituents have the meanings reported in the following; the compound which contains the epoxy group(s) can be constituted by the catalyst only. Such a composition can turn into a polymeric material having softening temperatures as high as 300.degree. C. and even higher.

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Genoa, Italy

Fabrizio Parodi