Abstract: Process for producing a propylene/1-pentene polymer in the presence of a Ziegler-Natta catalyst system with the monomer reactants being in the vapor phase while the reaction is in process and with no liquid component being present in the reaction zone while the reaction is in progress. Different ways of introducing the reactants are disclosed (partly in liquid phase then immediately evaporated or not, preheated or not, mixed with the comonomer or not).

Abstract: The invention provides a copolymer of propylene and pentene, together with a process for producing such copolymer and a polymer composition. In the process, propylene and pentene are reacted in a reaction zone at a pressure of 60 kg/cm2 and temperature of 0-100° C. for 20-480 minutes in the presence of a Ziegler-Natta catalyst or catalyst system. The polymer composition has several components, namely the above copolymer, a phenolic stabilizer, an organic phosphite stabilizer, a thioether stabilizer and at least one metal salt of a higher aliphatic acid, with the proviso that at least one of the organic phosphite stabilizer, the thioether stabilizer and said salt must be present, so that up to two thereof can optionally be omitted.

Abstract: The invention provides a copolymer of propylene and pentene, together with a process for producing such copolymer. The copolymer has a random arrangement of propylene and 1-pentene, is theromplastic, has crystalline and amorphous sequences, and has a melt flow index in the range of about 0.01 to about 200 g/10 minutes. In the process, propylene and pentene are reacted in a reaction zone at a pressure of 60 kg/cm.sup.2 and temperature of 0-100.degree. C. for 20-480 minutes in the presence of a Ziegler-Natta catalyst or catalyst system.