Process for preparing copolymers

C - Chemistry – Metallurgy – 08 – F

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C08F 2/00 (2006.01) C08F 2/06 (2006.01) G03G 17/10 (2006.01)

Patent

CA 2063473

Disclosed is a process for preparing copolymers which comprises, in the order stated: (1) adding monomers containing unsaturated carbon-to-carbon bonds, a first polymerization initiator, a second polymerization initiator, and a solvent to a reaction vessel; (2) purging the resulting solution with an inert gas; (3) sealing the reaction vessel and pressurizing it by addition of an inert gas to a pressure of from about 20 to about 600 kilopascals over ambient atmospheric pressure; (4) maintaining the temperature within the pressurized reaction vessel at a temperature of from about 50 to about 100°C for a period of from about 60 to about 300 minutes; (5) thereafter maintaining the temperature within the pressurized reaction vessel at a temperature of from about 80 to about 115°C for a period of from about 30 to about 300 minutes, wherein the temperature in step (5) is higher than the temperature in step (4); and (6) subsequently maintaining the temperature within the pressurized reaction vessel at a temperature of from about 115 to about 160°C for a period of from about 30 to about 180 minutes, wherein the temperature in step (6) is higher than the temperature in step (5). Polymers prepared according to the process of the present invention can be particularly useful in migration imaging members.

Méthode pour préparer des copolymères, comprenant les étapes successives suivantes : 1) chargement de monomères renfermant des liaisons carbone-carbone insaturées, d'un premier initiateur de polymérisation, d'un second initiateur de polymérisation et d'un solvant dans une cuve de réaction; 2) purge de la solution résultante à l'aide d'un gaz inerte; 3) scellement de la cuve et mise sous pression de celle-ci par addition d'un gaz inerte jusqu'à une pression d'environ 20 à 600 kilopascals au-dessus de la pression atmosphérique ambiante; 4) maintien de la température à l'intérieur de la cuve sous pression à environ 50-100 degrés C pendant à peu près 60 à 300 minutes; 5) par la suite, maintien de la température à l'intérieur de la cuve sous pression à environ 80-115 degrés C pendant à peu près 30 à 300 minutes, la température dans l'étape 5 étant supérieure à celle de l'étape 4; 6) ensuite, maintien de la température à l'intérieur de la cuve sous pression à environ 115-160 degrés C pendant à peu près 30 à 180 minutes, la température dans l'étape 6 étant supérieure à celle de l'étape 5. Les polymères préparés selon la présente invention peuvent être particulièrement utiles dans des composantes pour visualisation de migration.

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