Modified polymers and stable emulsions comprising the same

A rubber product comprising an elastomer material and a treated material, wherein the treated material comprises:

• at least one of a fabric and a fiber which has been treated with a fiber treatment formulation consisting essentially of:
• a modified polymer comprising a diene-based polymeric chain and at least one end terminated with a blocked isocyanate group, wherein the blocked isocyanate group is the reaction product of an isocyanate and a blocking agent and deblocks at temperatures of at least 100° C.;
• one or more latexes of one or more natural or synthetic elastomers;
• and
• optionally, at least one additional component selected from the group consisting of bases, solvents, anti-oxidants, catalysts, processing additives, shelf-life additives, and stability additives;
• wherein resorcinol and formaldehyde are not employed in treating the at least one of a fabric and a fiber.