Societe Nationale Des Poudres Et Explosifs

Patrice M Le Roy

Jean-Pierre G Senet

Serge L Lecolier

Jean-Marie J Biehler

Jacky P Pattein

Sabine M Journeau

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 new crosslinkable thermoplastic polyurethane resins having isocyanate end groups and containing ethylenic side groups. According to the invention, the polyurethane resins result from the reaction of:

Thermoplastic polyurethane resin having isocyanate end groups and

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.

Crosslinkable thermoplastic polyurethane resins containing ethylenic

Novel allyl-acrylic monomers of the formula: ##STR1## wherein R is a C.sub.1-4 alkylene group and R.sub.1 is hydrogen or methyl, are described. The preferred monomer is that in which R is ethylene and R.sub.1 is methyl. When subjected to conventional free radical polymerization, in one stage or two stages, these monomers give transparent polymers having good mechanical properties, particularly hardness.

Allyl-acrylic monomers, their preparation and polymers derived therefrom

Novel diesters of diethyl hydroxymethylphosphonate of the formula: ##STR1## in which R.sub.1 and R.sub.4 are alkylene radicals --(CH.sub.2).sub.m -- in which m is 0 or an integer; R.sub.2 and R.sub.3 are H or alkyl radicals, the total number of carbon atoms in R.sub.1, R.sub.2, R.sub.3 and R.sub.4 being not more than 10, are described. These diesters are valuable flameproofing agents for rigid and flexible polyurethane foams and for thermoplastic polyolefin and polyester foams.

Flame resistance of foams using diethyl hydroxymethylphosphonate esters

Novel diesters of diethyl hydroxymethylphosphonate of the formula: ##STR1## in which R.sub.1 and R.sub.4 are alkylene radicals --(CH.sub.2).sub.m -- in which m is 0 or an integer, R.sub.2 and R.sub.3 are H or alkyl radicals, the total number of carbon atoms in R.sub.1, R.sub.2, R.sub.3 and R.sub.4 being not more than 10, are described. These diesters are valuable flameproofing agents for rigid and flexible polyurethane foams and for thermoplastic polyolefin and polyester foams.

Growing community of inventors

Ballancourt, France

Patrice M Le Roy