Abstract: The invention relates to a polymer with ethylenic unsaturations incorporating silylmetallocene groups, a process for the manufacture of these polymers and a propellant composition having the polymer of the invention as a binder.The polymer of the invention incorporates ethylenic unsaturations, to at least some of which there are added silylmetallocene groups of formula ##STR1## in which M denotes a transition metal such as, for example, iron, the radicals R.sub.1, R.sub.2 and R.sub.3 being hydrocarbon radicals. The polymer may be a hydroxytelechelic or carboxytelechelic polybutadiene. This modified polymer is employed as a binder in composite propellant compositions, thus making it possible to solve the problem related to the migration of the combustion catalyst.The invention has application particularly in the field of solid propulsion.

Abstract: The present invention relates to a process for the manufacture of silylmetallocene compounds and the compounds obtained by this process.The process of the invention consists in reacting, in the presence of a hydrosilylation catalyst, a metallocene of general formula (I): ##STR1## M denoting a transition metal such as iron with a halosilane of general formula (II): ##STR2## in which X denotes a halogen and then reducing the resultant product to form a silylmetallocene compound containing at least one Si-H bond.The invention has application in the field of chemical industry.

Abstract: The invention relates to a polymer with ethylenic unsaturations incorporating silylmetallocene groups, a process for the manufacture of these polymers and a propellant composition having the polymer of the invention as a binder.The polymer of the invention incorporates ethylenic unsaturations, to at least some of which there are added silylmetallocene groups of formula ##STR1## in which M denotes a transistion metal such as, for example, iron, the radicals R.sub.1, R.sub.2 and R.sub.3 being hydrocarbon 2 radicals. The polymer may be a hydroxytelechelic or carboxytelechelic polybutadiene. This modified polymer is employed as a binder in composite propellant compositions, thus making it possible to solve the problem related to the migration of the combustion catalyst.The invention has application particularly in the field of solid propulsion.

Abstract: An initiator for the anionic polymerization of heterocyclic monomers comprises the product from the association of an alkali metal amide and the salt from at least one hydroxylated compound with the same alkali metal in an aprotic solvent. The hydroxylated compound is a primary alcohol, a secondary or tertiary alcohol, an ether alcohol, an amino alcohol, a polyether alcohol, a polyamino alcohol, a polyaminoetheralcohol, or an enol from a ketone.

Abstract: The invention relates to an anionic polymerization process using an initiator based on an alkali metal amide in combination with an alkali metal salt, as well as to the polymers obtained by this process.The polymerization process according to the invention is characterized in that an initiator is used which results from the combination of an alkali metal amide selected from the group comprising sodium amide, potassium amide or lithium amide and an alkali metal salt of which the cation is selected from the group comprising potassium, lithium or sodium, the anion being selected from the group comprising the thiocyanate, nitrite, cyanide and cyanate anions.These initiators make it possible to carry out the anionic polymerization or vinyl, heterocyclic and diene monomers in order to obtain special polymers or widely used polymers, with great adaptability and under advantageous economic conditions.

Abstract: An initiator for the anionic polymerization of vinyl monomers and dienic monomers comprises the product from the association of an alkali metal amide and the salt from at least one hydroxylated compound with the same alkali metal in an aprotic solvent. The hydroxylated compound is a primary, secondary, or tertiary alcohol. The hydroxylated compound may be a member selected from the group consisting of an alcohol substituted by an heterocyclic group, alcohols containing ethylenic unsaturation, alcohols substituted by an aromatic group, alicyclic alcohols, aromatic alcohols, polyhydroxy compounds, ether-alcohols, polyether-alcohols, and enols from ketones and amino acids.

Abstract: The invention relates to a process for the anionic polymerization and copolymerization of vinyl, dienic and heterocyclic monomers.According to the invention, the process consists in carrying out the reaction in the presence of an initiator consisting of a molecular combination of an alkali metal amide and the salt of the same alkali metal with at least one hydroxylic compound and in the absence of solvent. The initiator can be prepared by intimately mixing its constituents or in the presence of a solvent of low polarity which is subsequently evaporated off, or in situ in the monomer.Application to the synthesis of special or widely used polymers and copolymers.

Abstract: A process for the anionic polymerization or copolymerization of olefinic monomers, dienic monomers, vinyl monomers and heterocyclic monomers is described which comprises reacting at least one monomer which is an olefinic monomer, a vinyl monomer or an heterocyclic monomer with a catalyst capable of inducing anionic polymerization and an aprotic macroheterocyclic cryptant, said at least one monomer being the only medium for the reaction.The macroheterocyclic complexing agent has general formula ##STR1## in which: R.sub.1 is hydrogen, a hydrocarbon radical or alkoxycarbonyl, or the two R.sub.1 together can form a group of the general formula: ##STR2## in which A is a hydrocarbon radical,D is oxygen, sulfur, or a hydrocarbon radical, with the proviso that at leat two of the D groups are oxygen or sulfur and that if R.sub.1 is hydrogen, a hydrocarbon radical or alkoxycarbonyl, one of these two D groups is oxygen or sulfur and the other is oxygen, andn and p are integers from 1 to 3 and m is 2 or 3.