n. A thermoplastic resin produced by reacting natural rubber with stannic chloride or chlorostannic acid. This causes a reduction of the unsaturation and formation of condensed ring structures, typically with two or three rings being fused together. It is claimed (USA Patent 3,205,093) that a solution of cyclized rubber in toluene is one of the few lacquers known to adhere to polyolefins without their being pretreated or the lacquered surface being post-treated with radiation. Other uses include films and hot-melt coatings.