Abstract: An improved method for the preparation of homopolymers and copolymers of alpha olefins by means of a catalyst system comprising a titanium halide, an aluminum alkyl, and a phenolic compound which has a tendency to crystallize at low temperatures in the reactor feed system is disclosed. The improvement comprises prereacting a portion of the aluminum alkyl with the phenolic compound such that the components remain catalytically inactive and then activating the catalyst by adding the remainder of the aluminum alkyl to prereacted components in situ in the polymerization reactor, thereby preventing the crystallization of the phenolic compound at low temperatures in the feed system for the reactor.

Abstract: A catalyst and a process for the preparation of homopolymers and copolymers of alpha monoolefins by means of a catalyst system comprising (1) a titanium halide of the formulaTiCl.sub.3 m AlCl.sub.3where m is a number from 0 to 0.5, (2) a coordination complexing agent, the use of which is optional, and (3) an appropriate conventional aluminum-alkyl, the titanium halide (1) and the complexing agent (2), if used, having been milled together before use, wherein the catalyst system employed contains, as a further component (4), a sterically unhindered phenolic compound.

Abstract: A catalyst system for the preparation of homopolymers and copolymers of alpha monoolefins comprising (1) a titanium halide of the formulaTiCl.sub.3.m AlCl.sub.3where m is a number from 0 to 0.5, (2) an ester of a carboxylic acid having an oxygen, nitrogen, or sulfur-containing heterocyclic structure, and (3) an appropriate conventional aluminum alkyl.

Abstract: Thermoplastic elastomeric copolymers of tetrafluoroethylene and propylene and terpolymers of tetrafluoroethylene, propylene and a cure site monomer are disclosed which have a substantially uniform composition, i.e., a substantially uniform molar ratio of monomeric units and a relatively high molar ratio of tetrafluoroethylene units to propylene units within the range 1.0:0.11 to 1.0:0.54. The combination of high molar ratio of tetrafluoroethylene/propylene units, substantially uniform composition and good elastomeric properties is achieved by using a hybrid batch/continuous process wherein a reactor is initially charged with a mixture of tetrafluoroethylene, propylene and, optionally, a cure site monomer having a TFE/propylene molar ratio substantially higher than that of the polymer to be produced, i.e., in the range 1.0:0.01 to 1.0:0.087.