Solution polymerization of high molecular weight...

C - Chemistry – Metallurgy – 08 – G

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C08G 79/04 (2006.01)

Patent

CA 2295158

A process for making a high molecular weight poly(phosphoester) comprising the recurring monomeric units of formula (I), wherein X is -O- or -NR"-, where R" is H or alkyl; L is a divalent organic moiety, with the proviso that L cannot have formula (II); R' is H, alkyl, alkoxy, aryl, aryloxy, heterocyclic, or heterocycloxy; and n is from about 25 to 2000, is described. The process comprises the steps of: (a) substantially dissolving p moles of a di-XH compound in a solvent comprising more than 75 % toluene at a first temperature between about -75 ~C and +60 ~C to form a reaction mixture; (b) while maintaining the reaction mixture at the first temperature, adding q moles, where p q, of a phosphorodihalo compound; (c) gradually increasing said first temperature at a rate of less than about 1.5 ~C per minute as necessary to achieve a second temperature between about 0 ~C and 150 ~C, and mixing the reaction mixture at the second temperature to form the polymer of formula (I); and (d) isolating the polymer of formula (I).

L'invention concerne un procédé pour produire du poly(phosphoester) de poids moléculaire élevé comprenant le motif monomère R" répété de la formule (I) où X est -O- ou -NR"-, R" étant H ou alkyle; L est une fraction organique divalente, avec la restriction que L ne peut avoir la formule (II); R' est H, alkyle, alcoxy, aryle, aryloxy, hétérocyclique, ou hétérocycloxy; et n est compris entre environ 25 et 2000. Le procédé comprend les opérations suivantes: (a) on dissout sensiblement p moles d'un composé di-XH dans un solvant comprenant plus de 75 % de toluène à une première température comprise entre environ -75 ·C et +60 ·C pour former un mélange réactionnel; (b) tout en maintenant le mélange réactionnel à la première température, on ajoute q moles (p ? q) d'un composé phosphorodihalo; (c) on augmente graduellement cette première température à une vitesse inférieure à 1,5 ·C par minute environ, de manière à atteindre une seconde température comprise entre environ 0 ·C et 150 ·C, et on mélange le mélange réactionnel à la seconde température pour former le polymère de formule (I); et (d) on isole le polymère de formule (I).

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