Adhesion of dissimilar polymers

Claim 1

IN A TUBELESS TIRE, THE COMBINATION WHICH COMPRISES AN INNER LAYER OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF ISOOLEFIN-MULTIOLEFIN BUTYL RUBBER AND CHLORINATED ISOOLEFIN-MULTIOLEFIN BUTYL RUBBER; AN OUTER LAYER INCLUDING AN OPEN-BELLIED BODY COMPRISING TWO OPPOSING SIDEWALLS, SPACED BEAD PORTIONS AND A MEDIAN TREAD AREA; AND AN INTERMEDIATE LAYER DEFINING A CARCASS INCLUDING A MEMBER SELECTED FROM THE GROUP CONSISTING OF NATURAL RUBBER, A RUBBERY COPOLYMER OF BUTADIENE AND STYRENE, AND MIXTURES THEREOF HAVING A PLURALITY OF CORDS IMBEDDED THEREIN; SAID INTERMEDIATE LAYER BEING ADHESIVELY UNITED TO SAID INNER LAYER BY MEANS OF TWO INTERPOSED CEMENTS, THE FIRST CEMENT BEING ADJACENT THE BUTYL RUBBER INNER LAYER AND COMPRISING A VULCANIZABLE ISOOLEFIN-MULTIOLEFIN BUTYL RUBBER CHLORINATED TO CONTAIN AT LEAST 0.5 WEIGHT PERCENT COMBINED CHLORINE BUT NOT MORE THAN ABOUT ONE ATOM OF CHLORINE PER DOUBLE BOND IN THE POLYMER, SAID CEMENT BEING FREE OF OTHER VULCANIZABLE RUBBERY MATERIALS, THE SECOND CEMENT BEING ADJACENT THE CARCASS LAYER AND COMPRISING AN ADMIXTURE OF BOTH SAID CHLORINATED BUTYL RUBBER AND NATURAL RUBBER.