Metalation and functionalization of polymers and copolymers
AssigneesExxon Chemical Patents Inc., Cornell Research Foundation, Inc.
InventorsJean M. J. Frechet, Shah A. Haque, Joachim Hans Georg Steinke, Hsien-Chang Wang
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Abstract
There is provided a method of introducing functionality into a copolymer of an isoolefin and an alkylstyrene at the alkylbenzyl carbon atom comprising the steps of: forming a solution of said copolymer in a hydrocarbon solvent; adding to said polymer solution an alkali metal Cs, K, Na alkoxide and an alkyl lithium compound to form a superbase with the polymer solution; and adding an electrophile to said base polymer solution also provided are the metalated copolymers and the functionalized derivative therefrom.
Claims8
A random copolymer represented by the formula:
- ##STR4## wherein "a" is in the range of 1 to 70,000, "b" in the range of 1 to 7,000 and "c" in the range of 0 to 7,000, R.sub.1 and R.sub.2 are each independently a C.sub.1 -C.sub.5 alkyl or hydrogen, provided that at least one of R.sub.1 and R.sub.2 is alkyl and R.sub.1 +R.sub.2 .ltoreq.5 carbon atoms;
- R.sub.3 and R.sub.4 are each independently one of hydrogen, a C.sub.1 -C.sub.4 alkyl group, and M is an alkali metal other than lithium.
A method of metallating a copolymer of an isoolefin and an alkylstyrene at the alkylbenzyl carbon atom, said process comprising the steps of:
- forming a solution of said copolymer in a hydrocarbon solvent;
- adding to said polymer solution, an alkali metal alkoxide and an alkyl lithium compound to form a superbase with the polymer solution;
- and recovering the metallated copolymer.
Dependencies are inferred from the claim text.