Method of preparing an optical polymerizate

Details Method of preparing an optical polymerizate Method of preparing an optical polymerizate

C - Chemistry, Metallurgy

08

G

C08G 18/38 (2006.01) G02B 1/04 (2006.01) G02B 5/23 (2006.01)

Patent

CA 2391856

The present invention is directed to a novel method of preparing a polymerizate, which includes the step of polymerizing a two-component composition, which includes: a first component containing at least one polycyanate reactant having at least two functional groups selected from isocyanate, isothiocyanate and combinations thereof, the polycyanate reactant being the reaction product of: a polythiol monomer having at least two thiol groups; and a polycyanate monomer having at least two functional groups selected from isocyanate, isothiocyanate and combinations thereof; and a second component containing at least one polyamine reactant having at least two functional groups selected from primary amine, secondary amine and combinations thereof. The molar equivalent ratio of (NCO + NCS) groups from the first component to (-NH2 + -NH-) groups from the second component is from 0.5 to 100. The present invention is also directed to polymerizates prepared according to the method of the present invention. The present invention is further directed to photochromic articles that may be prepared from the polymerizates of the present invention.

L'invention concerne un nouveau procédé de préparation d'un polymérisat, qui consiste à polymériser une composition à deux composants. Un premier composant contient au moins un réactif polycyanate ayant au moins deux groupes fonctionnels choisis parmi isocyanate, isothiocyanate et des combinaisons de ceux-ci, le réactif de polycyanate étant le produit de la réaction d'un monomère polythiol ayant au moins deux groupes thiol; et un monomère polycyanate ayant au moins deux groupes fonctionnels choisis parmi isocyanate, isothiocyanate et des combinaisons de ceux-ci. Un second composant contient au moins un réactif polyamine ayant au moins deux groupes fonctionnels choisis parmi amine primaire, amine secondaire et des combinaisons de ceux-ci. Le rapport équivalent molaire des groupes (NCO + NCS) du premier composant aux groupes (-NH¿2? + -NH-) du second composant est de 0,5 à 100. L'invention concerne également des polymérisats préparés selon ce procédé. Elle concerne en outre des articles photochromiques qui peuvent être préparés à partir desdits polymérisats.

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