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A 3.5% solution of 10 g of poly(isobutylene-co-isoprene) was prepared in 96.5% of a 1:1 mixture of trimethylpentane and CCl4. The solution was purged with N2 and with the temperature adjusted to 75° C., 0.2 g of benzoyl peroxide was added and the solution stirred for 1 hour. After this period 1.0 g of methylmethacrylate was added and the system was stirred for 16 hours under a N2 atmosphere. At the end of 16 hours, 0.3 g of benzoyl peroxide or azobisisobutyronitrile was added and 40 g of methyl methacrylate was added over an hour. The polymerization was continued for 16 hours with constant mechanical stirring under a N2 atmosphere. The reaction mixture was cooled to room temperature and the particles cleaned by successive steps of centrifugation, decanting, and resuspension. The particles were freeze dried to a powder.

1. customThe solution was purged with N2 and with the temperature
2. customadjusted to 75° C.
3. addition0.2 g of benzoyl peroxide was added
4. additionAfter this period 1.0 g of methylmethacrylate was added
5. stirringthe system was stirred for 16 hours under a N2 atmosphere
6. additionAt the end of 16 hours, 0.3 g of benzoyl peroxide or azobisisobutyronitrile was added
7. addition40 g of methyl methacrylate was added over an hour
8. waitThe polymerization was continued for 16 hours
9. stirringwith constant mechanical stirring under a N2 atmosphere
10. customdecanting
11. customdried to a powder