| abstract |
57 A method for modifying a rubber having a unsaturated carbon bond which comprises reacting the rubber with an organic compound represented by the general formulawherein -R represents a hydrocarbon group, and -X isrepresents an organic atomic grouping, in the presence of a Lewis acid to introduce an ester group. Optionally, the ester group introduced is converted into a carboxyl group by chemically treating the reaction product. |