Process for preparing polysulfides, polysulfides, and their use

Details Process for preparing polysulfides, polysulfides, and their use Process for preparing polysulfides, polysulfides, and their use

C - Chemistry, Metallurgy

08

G

C08G 75/14 (2006.01)

Patent

CA 2644969

The invention relates to a process for preparing a polysulfide comprising the step of reacting a first hydroxyl-terminated polysulfide of formula (I) wherein n is 2 to 40, with at least one compound selected from the group consisting of a second hydroxyl-terminated polysulfide which is in accordance with formula (I), a hydroxyl- and/or thiol-containing molecule, and a phosphorous sulfide to obtain a third hydroxyl-terminated polysulfide, wherein the reaction is carried out in the presence of an acid catalyst if the compound is the second hydroxyl-terminated polysulfide or the hydroxyl- and/or thiol- containing molecule, and if the compound is the phosphorous sulfide, the reaction is optionally carried out in the presence of an acid catalyst.

Cette invention concerne un procédé de préparation d'un polysulfure comprenant l'étape consistant à faire réagir un premier polysulfure à terminaison hydroxyle de formule (I), dans laquelle n vaut de 2 à 40, avec au moins un composé choisi dans le groupe constitué d'un deuxième polysulfure à terminaison hydroxyle répondant à la formule (I), d'une molécule contenant un groupe hydroxyle et/ou thiol et d'un sulfure phosphoreux, afin d'obtenir un troisième polysulfure à terminaison hydroxyle. Lorsque ledit composé est le deuxième polysulfure à terminaison hydroxyle ou la molécule contenant un groupe hydroxyle et/ou thiol, la réaction est menée en présence d'un catalyseur acide ; lorsque ledit composé est le sulfure phosphoreux, la réaction est éventuellement menée en présence d'un catalyseur acide.

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