Polymerizable compositions for making thio containing resins...

Details Polymerizable compositions for making thio containing resins... Polymerizable compositions for making thio containing resins...

C - Chemistry, Metallurgy

08

G

C08G 18/38 (2006.01) C08G 18/18 (2006.01) C08G 18/22 (2006.01) C08G 75/08 (2006.01) C08L 75/04 (2006.01)

Patent

CA 2348410

The polymerizable compositions comprise: A) at least one polyiso(thio)cyanate monomer, and at least one polythiol monomer; or at least one episulfide compound and optionally one or more compounds having two or more functional groups capable of reacting with episulfide groups; and B) as polymerization catalyst, an effective amount of a salt of formula (MPm + Yn-), Y- is an anion such as the corresponding acid YH has a pKa fulfilling the condition 0.5 <= pKa <= 14 with the proviso that when the polymerizable compositions comprise an episulfide compound and MP+ is an ammonium group, the polymerizable composition also comprises an electro-donor compound. Application to the fabrication of optical articles, such as lenses.

Les compositions polymérisables comportent (A) au moins un monomère de polyiso(thio)cyanate, et au moins un monomère de polythiol; ou bien au moins un composé épisulfure et éventuellement un ou plusieurs composés possédant au moins deux groupes fonctionnels susceptibles de réagir avec des groupes épisulfure; et (B) comme catalyseur de polymérisation, une quantité efficace d'un sel de formule (M?P¿¿m? + Y¿n??-¿) dans laquelle Y?-¿ est un anion tel que l'acide correspondant YH présente un pKa satisfaisant à la condition 0,5 <= pKa <= 14 sous réserve que lorsque les compositions polymérisables comprennent un composé épisulfure et que M?P+¿ est un groupe ammonium, la composition polymérisable renferme également un composé donneur d'électrons. L'invention s'applique à la fabrication d'articles optiques, tels que des lentilles.

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