A method of making a polymer that includes reacting an olefin in the presence of an ensemble of crosslinker molecules, each molecule of the ensemble comprising a S.sub.n moiety and having at least two polymerizable groups, wherein n is an integer of from 1 to 8, in the presence of a polymerization initiator, to produce a reversibly-crosslinked polymer that includes crosslinking bonds, said crosslinking bonds being bonds that dissociate when the reversibly-crosslinked polymer is reprocessed at temperatures 50 C. or greater, where, for at least 90% of the crosslinkers molecules in the ensemble, n is equal to 2.

The present disclosure provides a process. In an embodiment, the process includes introducing an antifoulant into an ethylene feed of a reactor system. The reactor system includes the ethylene feed, a hyper-compressor, a preheater and a polymerization reactor. The ethylene feed is located upstream of the hyper-compressor. The antifoulant consists of an inhibitor, molecular oxygen, and optionally a solvent. As the ethylene feed is located upstream of the hyper-compressor, the process includes introducing the antifoulant into the ethylene feed upstream of the hyper-compressor. The process further includes adding a free radical initiator to the polymerization reactor. The process further includes polymerizing the ethylene in the polymerization reactor under high pressure free-radical polymerization conditions, and forming an ethylene-based polymer.

A process for polymerizing or copolymerizing one or more ethylenically unsaturated monomers with a controlled gas velocity of the gaseous reaction. A process for polymerizing or copolymerizing one or more ethylenically unsaturated monomers at temperatures from 100 to 350 C. and pressures in the range from 110 to 500 MPa, comprising the steps of: (a) compressing a gaseous reaction mixture in a hyper compressor, (b) providing the reaction mixture to each compressing stage through a suction pipe system, and (c) discharging the compressed reaction mixture from the compressing stage through a discharge pipe system.

Provided is an ethylene-acrylic acid copolymer which may maintain high initial adhesive properties for a long time by having a zero shear viscosity (.sub.0) and a storage modulus (G) in specific ranges.

A process for preparing ethylene polymers including the step of polymerizing ethylene or copolymerizing ethylene and one or more comonomers at a temperature from 100 C. to 350 C. and a pressure of from 110 MPa to 350 MPa in a continuously operated tubular polymerization reactor, thereby yielding a reaction mixture, wherein the tubular polymerization reactor has a reactor cooling jacket for removing the heat of the reaction and a pressure control valve, the reaction mixture leaves the reactor through the pressure control valve, the reaction mixture then passes a post-reactor cooler equipped with a post-reactor cooling jacket, the reactor cooling jacket is provided with a reactor coolant having an inlet temperature and the post-reactor cooling jacket is provided with a post-reactor coolant having an inlet temperature, and the inlet temperature of the post-reactor coolant is independently controlled from the inlet temperature of the reactant coolant.

Embodiments of methods of producing high pressure ethylene-based polymer comprise polymerizing via free-radical polymerization at a pressure of at least 1000 atmospheres (atm) an ethylene monomer feed and optionally additional comonomer feed in the presence of radical scavenger to produce the high pressure ethylene-based polymer, wherein the radical scavenger comprises Structure 1: wherein: n can be 0 to 100; R.sub.1, R.sub.2 and R.sub.3 are each independently H, (C.sub.1-C.sub.40)hydrocarbyl, (C.sub.1-C.sub.40)heterohydrocarbyl, or an aromatic containing moiety; and R.sub.4-R.sub.8 are each independently H, OH, (C.sub.1-C.sub.40)hydrocarbyl, (C.sub.1-C.sub.40)heterohydrocarbyl, or an aromatic containing moiety with the proviso that at least one of R.sub.4-R.sub.8 needs to be OH.

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