Societe Nationale Des Poudres Et Explosifs

Jacky P Pattein

Patrice M Le Roy

The invention relates to a thermoplastic solid composition which can be cured by the application of a radiation, for example UV, and to solid products which can be handled and stored and are obtained by shaping such a composition, before application of the radiation. The solid thermoplastic composition comprises at least one solid thermoplastic polymer and a radiation-crosslinkable oligomer containing at least two ethylenic unsaturations, each of these unsaturations being situated either at the end of a chain or in a pendent position. The weight ratio of the solid thermoplastic polymer to the radiation-crosslinkable oligomer is between 55/45 and 964, preferably between 70/30 and 96/4, respectively. The products obtained after crosslinking by the application of radiation have good mechanical properties, even at elevated temperature. The compositions of the invention can be used particularly for producing packaging sheets having the shape of the product to be wrapped, and of prosthetic components.

Radiation-crosslinkable thermoplastic solid composition and curable

The invention relates to the field of crosslinkable thermoplastic polyurethane resins containing ethylenic side groups. This resin preferably results from the reaction of (a) an organic diisocyanate, (b) a saturated linear diol, (c) a diol having a molecular weight of less than 300, and (d) an unsaturated diol consisting of the acrylic or methacrylic acid ester of a trihydric alcohol, of the formula: ##STR1## in which R.sub.3 =Me or H and n is an integer between 1 and 4. 2,3-Dihydroxypropyl acrylate will preferably be used. The polyurethane resin according to the invention can be processed in accordance with the well-known traditional processes for thermoplastics, while at the same time being capable of undergoing crosslinking, by virtue of their unsaturated side groups, to form a three-dimensional lattice. Application to profiles and prepregs.

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Etrechy, France

Jacky P Pattein