Abstract: Disclosed herein is a method for decolorizing a colored polymer material, which includes subjecting the colored polymer material to a first decolorizing treatment with a first decolorizing solution to remove a colorant from the colored polymer material, so as to obtain a first decolorized polymer material and a first used decolorizing solution. A method for preparing a regenerated polymer, and a decolorizing solution are also disclosed.

Abstract: A method for manufacturing a fluorine-free water repellent includes: mixing a paraffin, an inorganic nanopowder and a first reactive monomer to form a first mixture, in which the first reactive monomer includes a structure represented by formula (A), formula (B) or a combination thereof, the formula (A) is wherein X1 is a benzene, and the formula (B) is wherein X2 is CH3 or H and X3 is an alkyl group having 18 or more carbon atoms; mixing an emulsifier, a cosolvent and water to form a second mixture; mixing the first mixture and the second mixture to form a pre-emulsion; and adding an initiator and a second reactive monomer into the pre-emulsion, in which the first reactive monomer and the second reactive monomer are polymerized to form a water repellent, wherein the second reactive monomer is vinylidene chloride.

Abstract: A method for preparing a modified copolyester includes the steps of: i) subjecting a mono(2-hydroxylalkyl)dicarboxylate to an esterification reaction with an isosorbide to form an intermediate; and ii) subjecting the intermediate to a condensation polymerization in the presence of a condensation polymerization catalyst. The method may enhance the reactivity of isosorbide, reduce the amount of water by-product, and raise the glass transition temperature and the color stability of the copolyester thus obtained.

Abstract: A method for preparing a modified copolyester includes the steps of: i) subjecting a mono(2-hydroxylalkyl)dicarboxylate to an esterification reaction with an isosorbide to form an intermediate; and ii) subjecting the intermediate to a condensation polymerization in the presence of a condensation polymerization catalyst. The method may enhance the reactivity of isosorbide, reduce the amount of water by-product, and raise the glass transition temperature and the color stability of the copolyester thus obtained.

Abstract: A method for decolorization of a dyed polyester fiber includes: separately providing a dyed polyester fiber stained with a dye, and a solvent capable of dissolving the dye; heating the solvent to produce a fresh vapor of the solvent, the temperature of the fresh vapor ranging between the glass transition temperature and the melting point of the polyester fiber; condensing the fresh vapor to form a condensed fluid of the solvent; contacting the dyed polyester fiber with the condensed fluid of the solvent that has a temperature sufficient to dissolve the dye such that the dye is extracted from the dyed polyester fiber so as to form a dye-containing solution and a decolorized polyester fiber; and separating the dye-containing solution from the decolorized polyester fiber.

Abstract: A method for dyeing a modified polyester fiber is provided. A polyester composition is melt blended with a modifying agent to form a thermoplastic composition. The modifying agent is an aliphatic-aromatic co-polyester, and present in an amount of about 1 to 16 parts by weight per 100 parts by weight of the thermoplastic composition. The thermoplastic composition is melt spun to obtain the modified polyester fiber, and the modified polyester fiber is dyed with a disperse dye at a temperature between about 100° C. and about 130° C.

Abstract: A polyester based blend includes: a polyester to be formed into a polymer matrix for a packaging article when the polyester based blend is melted and extruded; an oxidative catalyst to be dispersed in the polymer matrix; and an additive of an aldehyde that is to be dispersed in the polymer matrix, that is catalytically reactive with oxygen at room temperature in the presence of the oxidative catalyst, and that has a melting point greater than room temperature. A packaging article made from the melt-extruded polyester based blend is also disclosed.

Abstract: A PET material of a modified PET composition includes: terephthalic acid; ethylene glycol; a modifier; and a chain branching agent selected from one of a non-cyclic compound and a cyclic compound. The non-cyclic compound has at least three functional groups, and the cyclic compound, after ring opening, has at least three functional groups. Each of the functional groups of each of the non-cyclic compound and the cyclic compound is selected from hydroxyl group, carboxyl group, amine group, epoxy group, NCO, and COOR, in which R represents a C1-C18 alkyl group.

Abstract: A heat-shrinkable PET film comprises a thermally stretched film body exhibiting shape-memory characteristics and made from a PET material of a modified PET composition that includes terephthalic acid, ethylene glycol, and a modifier selected from 1,3-dihydroxy-2-methylpropane, 1,3-dihydroxy-2-methylpropane alkoxylate, 2,5-dimethyl-2,5-hexanediol, and combinations thereof.