Polymerizations based on cyclic oligomer
AssigneeE. I. Du Pont de Nemours and Company
InventorsRobert Ray Burch, Jr., Alexa Ann Dembek, Steven Raymond Lustig, Maria Spinu
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Abstract
This invention concerns a process for polymerizing cyclic oligomers to homopolymers or copolymers, conducted in the presence of one or more linear polymers.
Claims13
A process for polymerizing cyclic oligomers, wherein cyclic oligomers are polymerized as homopolymers or co-polymers, said process conducted in the presence of one or more linear polymers, conducted with a recycle loop for recycling linear polymer to the process, wherein the linear polymer is recycled to an oligomer feed by means of the recycle loop, and optionally conducted in the presence of a polymerization catalyst, wherein the cyclic oligomer is selected from the group consisting of cyclic forms of polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polyethylene naphthenate, polyethylene isophthalate, sulfonated cyclic oligoester and sulfonated polyethylene isophthalate, and wherein the linear polymer is selected from the group consisting of polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polyethylene naphthenate, and any co-polymer thereof.
A process for polymerizing cyclic oligomers, wherein cyclic oligomers are polymerized as homopolymers or co-polymers, said process conducted in the presence of one or more linear polymers, optionally conducted with a recycle loop for recycling linear polymer to the process, and optionally conducted in the presence of a polymerization catalyst, wherein the cyclic oligomer is a sulfonated cyclic oligoester and wherein the linear polymer is selected from the group consisting of polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polyethylene naphthenate, and any co-polymer thereof.
Dependencies are inferred from the claim text.