发明名称 |
BIPHASIC POLYMERIZATION PROCESS |
摘要 |
Improvements are disclosed for biphasic polymerization processes in which an aqueous solution of a first monomer that is hydrolytically unstable below a pH of about six or above a pH of about eight is admixed with a water-immiscible organic solvent and there is added to the admixture a catalyst selected from tertiary amine, quaternary amine and phosphonium catalysts, an acid-forming co-monomer for the first monomer, an acid scavenger, after which the resulting polymer is recovered, wherein the improvement includes providing the aqueous solution at a pH between about six and about eight, and adding to the admixture the acid-forming co-monomer and the acid scavenger at relative rates effective to maintain the pH of the admixture between about six and about eight. The catalyst may be added in a molar ratio to the first monomer effective to provide a predetermined weight-average or number-average molecular weight for the resulting polymer. Biphasic polymerization processes for monomers that are not pH sensitive are also disclosed.
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申请公布号 |
WO9900442(A1) |
申请公布日期 |
1999.01.07 |
申请号 |
WO1998US13657 |
申请日期 |
1998.06.29 |
申请人 |
INTEGRA LIFESCIENCES I, LTD. |
发明人 |
KEMNITZER, JOHN, E.;BRODE, GEORGE, L.;KOHN, JOACHIM, B. |
分类号 |
C08G63/685;C08G63/79;C08G63/87;C08G64/12;C08G64/24;C08G75/18;(IPC1-7):C08G64/24 |
主分类号 |
C08G63/685 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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