The present disclosure provides a process of recovering sulfopolyester comprising reduced impurity. Sulfopolyester is recovered from a composite material comprising water-dispersible sulfopolyester polymer and at least one non-water-dispersible polymer. The process includes washing the composite material comprising water-dispersible sulfopolyester with a solvent composition. The recovered sulfopolyester can be generated as a concentrated aqueous dispersion, a polymer melt, or a sulfopolyester solid.

The present disclosure provides a process of recovering sulfopolyester comprising reduced impurity. Sulfopolyester is recovered from a composite material comprising water-dispersible sulfopolyester polymer and at least one non-water-dispersible polymer. The process includes washing the composite material comprising water-dispersible sulfopolyester with a solvent composition. The recovered sulfopolyester can be generated as a concentrated aqueous dispersion, a polymer melt, or a sulfopolyester solid.

The present invention is a resin composition, including: a resin α1 having an aromatic dicarboxylic acid monomer unit A1 having a hydrophilic group, a dicarboxylic acid monomer unit B1 having no hydrophilic group, and an aromatic monomer unit C1; and a resin α2 having an aromatic dicarboxylic acid monomer unit A2 having a hydrophilic group, a dicarboxylic acid monomer unit B2 having no hydrophilic group, and an aliphatic monomer unit C2, wherein the resin α2 includes a monomer unit other than a monomer unit that constitutes the resin α1, and a mass ratio of a content of the resin α1 to a content of the resin α2 is 0.9 or more and 20 or less. According to the present invention, a resin composition that can be removed only with water while maintaining the heat resistance of polymer materials can be provided.

A reversibly crosslinked polymer and methods for producing and using the obtained polymer are disclosed. In particular, reversibly crosslinked polymers of the invention comprise polyesters formed by the reaction of mercaptosuccinic acid and a diol to form a monomeric unit that includes thiol groups as crosslinking moieties. Oxidation of the thiol groups affords crosslinked polymer comprising a disulfide linkage that, upon reduction of the disulfide linkage, provides a non-crosslinked polymer. In some embodiments, polymers of the invention are degradable and are biocompatible.

Polyethylene glycol (PEG)-b-poly(β-amino ester) (PBAE) co-polymers (PEG-PBAE) and blends of PEG-PBAEs and PBAEs and their use for delivering drugs, genes, and other pharmaceutical or therapeutic agents safely and effectively to different sites in the body and to different cells, such as cancer cells, are disclosed.

The subject matter described herein relates to methods for polymer xanthylation and the xanthylated polymers produced by such methods. Subsequent replacement of the xanthylate moiety allows facile entry into functionalized polymers.

An ultraviolet radiation-curable composition comprising a polyester having at least one pendant ultraviolet radiation-curable moiety covalently bonded to the polyester, wherein the polyester does not contain any free-radically polymerizable activated C═C groups.

An ultraviolet radiation-curable composition comprising a polyester having at least one pendant ultraviolet radiation-curable moiety covalently bonded to the polyester, wherein the polyester does not contain any free-radically polymerizable activated C═C groups.

The present invention provide a polyester masterbatch comprising: at least one dicarboxylic acid or ester thereof; at least one diol; at least one high molecular weight polyalkylene glycol up to 60%; optionally DMSIP/SIPA up to 40%; at least one antioxidant up to 1.0%; and at least one or more additives up to 20%; which provides an environment friendly, cost effective, superior and easy dye ability solution for various polyesters.

An article of manufacture. The article of manufacture includes a ring-opened lactide copolymer. The ring-opened lactide copolymer is formed in a process that includes reacting a functionalized lactide monomer with a BPA-derived monomer. The reaction forms a lactide copolymer, which is reacted to form the ring-opened lactide copolymer.