Initiators for cationic polymerization
AssigneeMinnesota Mining and Manufacturing Company
InventorOmar Farooq
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Abstract
Disclosed are novel compounds which are useful as initiators for cationically polymerizable monomers. The novel compounds comprise a carbon containing cation (e.g., trimethyloxonium) which is capable of initiating cationic polymerization and a non-nucleophilic counterion which is an at least partially fluorinated hydrocarbylsulfonato metallate (e.g. perfluoroethylsulfonato-aluminate). The disclosed initiators are capable of initiating the cationic polymerization of a wide variety of monomers such as epoxides, tetrahydrofuans, oxazolines, vinyls, lactones, and the like.
Claims11
A process for the polymerization of a cationically polymerizable monomer comprising intimately contacting a cationically polymerizable monomer with a cationic polymerization initiator thereby initiating polymerization of said monomer, said initiator being represented by the following formula:
- Y.sub.a.sup.b+ [(RSO.sub.3).sub.n M)].sup.Z-
- wherein:
- Y is a cation selected from the group consisting of oxonium, sulfonium, sulfoxonium, selenonium, iodonium, diazonium, pyrylium, carbenium, and acylium cations;
- R is independently selected from the group consisting of ##STR3## R.sub.1 is hydrogen, halogen, an alkyl group or an aryl group;
- F is fluorine;
- M is an element chosen from Groups 3-15, inclusive, of the Periodic Table;
- z is 1, 2, 3, or 4;
- and
- a, b, and n are integers such that z is less than or equal to n and the product of a multiplied by b equals z.
Dependencies are inferred from the claim text.