Article having organo-phosphonitrile rubber coating bonded to natural or synthetic rubber and method of making

Method of making a coated rubber article which comprises

• first coating a cured natural or synthetic rubber article with a solution containing as priming agent a di- or poly-vinyl compound and an organic peroxide cross-linking agent,
• then coating said article with a solution containing a generally linear organo-phosphonitrile polymer containing randomly distributed repeating units having the structures:
• ##STR4## wherein A represents RO--, RNH--, X(CF.sub.2).sub.m CH.sub.2 O--, or X(CF.sub.2).sub.m CH.sub.2 NH-- and B represents R'O--, R'NH, Y(CF.sub.2).sub.n CH.sub.2 O--, or Y(CF.sub.2).sub.n CH.sub.2 NH--, R and R' each being selected from the group consisting of lower alkyl and aryl such as phenyl, tolyl, chlorophenyl, X and Y each being selected from the group consisting of hydrogen and fluorine, and m and n each being an integer from 1 to 8 inclusive, together with an organic peroxide curing agent in an amount from 0.1 to 5% by weight of said polymer, and an alkyl aluminum compound having the composition
• Al R.sub.1 R.sub.2 R.sub.3
• wherein R.sub.1 is selected from the group consisting of hydrogen and alkyl having from 2 to 8 carbon atoms and R.sub.2 and R.sub.3 are alkyl having from 2 to 8 carbon atoms, the amount of said aluminum compound being from 0.01 to 2% by weight of said polymer,
• drying and heating said coated article at a temperature from room temperature to 70.degree. C. to cure said organo-phosphonitrile polymer coating and to cross-link said priming agent and bond said polymer coating to said article.