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公开(公告)号：CA2063473A1
公开(公告)日：1993-01-02
申请号：CA2063473
申请日：1992-03-19
Applicant: XEROX CORP
Inventor： NG T HWEE , MAHABADI HADI K , TAM MAN C , KOVACS GREGORY J , PETERS ERIC M , LOUTFY RAFIK O
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公开(公告)号：CA2063473C
公开(公告)日：1998-09-22
申请号：CA2063473
申请日：1992-03-19
Applicant: XEROX CORP
Inventor： KOVACS GREGORY J , TAM MAN C , NG T HWEE , MAHABADI HADI K , PETERS ERIC M , LOUTFY RAFIK O
Abstract: 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 polymerizatio n 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.degree.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.degree.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.degree.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.
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