Elf Atochem S.a.

Autochem

Paul Grosius

Didier Vanhoye

Patrice Hurtel

Oligomers of the formula ##STR1## wherein: (1) at least one A=--CH.sub.2 CHR.sup.1 COODOH (a) (R.sup.1 =H, CH.sub.3 and D=C.sub.1 -C.sub.4 alkylene), the other A's=H or C.sub.1 -C.sub.4 alkyl, it being possible for at least a part of the residues (a) to be converted into A.sup.1 =--CH.sub.2 CHR.sup.1 COODOCONHD.sup.1 NCO (D.sup.1 =divalent organic residue), it being possible for at least a part of the residues A.sup.1 to be converted into A.sup.2 =--CH.sub.2 CHR.sup.1 COODOCONHD.sup.1 NHCOOR.sup.2 (R.sup.2 =monovalent radical obtained by removal of OH from a monoalcohol containing a vinylidene group);

Precursors of polymers containing isocyanurate units

This process for the manufacture of benzyl methacrylate and of its halogenated or alkylated derviatives by the reaction of benzyl chloride or of one of its halogenated or alkylated derivatives with an alkali metal methacrylate is characterized in that the reaction is carried out in the presence of not more than 3 mol %, based on the benzyl chloride or a derivative, of a tertiary amine. The alkali metal is chosen especially from lithium, potassium and sodium. The tertiary amine is preferably a tertiary diamine of general formula: ##STR1## in which n is an integer ranging from 1 to 10 and R.sub.1, R.sub.2, R.sub.3 and R.sub.4, which are identical or different, are alkyl, cycloalkyl or aryl radicals containing from 1 to 12 carbon atoms, functionalized if appropriate and, if appropriate, such that they form a heterocyclic ring with the nitrogen atom(s) carrying them.

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Petite-Rosselle, France

Paul Grosius